21
1 New Packaging Technology For White High-Power LEDs
| Date post: | 22-Dec-2015 |
| Category: |
Documents |
| Upload: | shannon-stephens |
| View: | 219 times |
| Download: | 2 times |
1
New Packaging Technology For White High-Power LEDs
2
Outlinesbull Introduction(3)
bull 1048708Paper review (13)
Paper 1 Study of Phosphor Thermal-Isolated Packaging Technologies for High- Power White Light-Emitting Diodes (4) Paper 2 Improved Performance White LED (6) Paper 3 Analysis of high-power packages for phosphor-based white-light- emitting diodes (3)
bull 1048708Conclusion(1)
bull 1048708References(1)
3
Introduction
The destination of LED packaging － Packaging the Semiconductor chip can provide
electronic components of business using
－ To protect the chip against radiation steam oxygen
and the damage from the outside
－ Increase the authenticity of the components
－ Improve the functions of the chips
－ Provide the radiation organization for chips
－ Design all kinds of packaging forms to provide
different applications of products
4
Introduction
Die attached
Epoxy curing
Wire bonding
Molding
Singluration
Testing
Sorting
5
Introduction
RGB LED Blue LED RG Phosphor
UV LED RGB PhosphorBlue LED YAG Phosphor
White light emitting diodes
6
Study of Phosphor Thermal-Isolated Packaging Technologies for High- Power White
Light-Emitting Diodes
Bingfeng Fan Hao Wu Yu Zhao Yulun Xian and Gang Wang
bull Manuscript received February 12 2007 revised April 17 2007 The authors are with State Key Laboratory of Optoelectronic
Materials and Technologies Sun Yat-sen University Guangzhou 5102 China and also with
the School of Physics and Engineering Sun Yat-sen University Guangzhou 51027755 China (e-mail stswanggmailsysueducn)
Color versions of one or more of the figures in this letter are available online at httpieeexploreieeeorg
7
Fig Schematic cross-sectional view of (a) conventional phosphor converting white LED and (b) thermal-isolated phosphor-converting white LED h = 1 mm
Experiment
8
Fig Measured (red line closed symbols) and simulated (blue line open symbols) temperature profile along the phosphor surface midline in conventional packaging and thermal-isolated packaging (both without placing lens)
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
2
Outlinesbull Introduction(3)
bull 1048708Paper review (13)
Paper 1 Study of Phosphor Thermal-Isolated Packaging Technologies for High- Power White Light-Emitting Diodes (4) Paper 2 Improved Performance White LED (6) Paper 3 Analysis of high-power packages for phosphor-based white-light- emitting diodes (3)
bull 1048708Conclusion(1)
bull 1048708References(1)
3
Introduction
The destination of LED packaging － Packaging the Semiconductor chip can provide
electronic components of business using
－ To protect the chip against radiation steam oxygen
and the damage from the outside
－ Increase the authenticity of the components
－ Improve the functions of the chips
－ Provide the radiation organization for chips
－ Design all kinds of packaging forms to provide
different applications of products
4
Introduction
Die attached
Epoxy curing
Wire bonding
Molding
Singluration
Testing
Sorting
5
Introduction
RGB LED Blue LED RG Phosphor
UV LED RGB PhosphorBlue LED YAG Phosphor
White light emitting diodes
6
Study of Phosphor Thermal-Isolated Packaging Technologies for High- Power White
Light-Emitting Diodes
Bingfeng Fan Hao Wu Yu Zhao Yulun Xian and Gang Wang
bull Manuscript received February 12 2007 revised April 17 2007 The authors are with State Key Laboratory of Optoelectronic
Materials and Technologies Sun Yat-sen University Guangzhou 5102 China and also with
the School of Physics and Engineering Sun Yat-sen University Guangzhou 51027755 China (e-mail stswanggmailsysueducn)
Color versions of one or more of the figures in this letter are available online at httpieeexploreieeeorg
7
Fig Schematic cross-sectional view of (a) conventional phosphor converting white LED and (b) thermal-isolated phosphor-converting white LED h = 1 mm
Experiment
8
Fig Measured (red line closed symbols) and simulated (blue line open symbols) temperature profile along the phosphor surface midline in conventional packaging and thermal-isolated packaging (both without placing lens)
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
3
Introduction
The destination of LED packaging － Packaging the Semiconductor chip can provide
electronic components of business using
－ To protect the chip against radiation steam oxygen
and the damage from the outside
－ Increase the authenticity of the components
－ Improve the functions of the chips
－ Provide the radiation organization for chips
－ Design all kinds of packaging forms to provide
different applications of products
4
Introduction
Die attached
Epoxy curing
Wire bonding
Molding
Singluration
Testing
Sorting
5
Introduction
RGB LED Blue LED RG Phosphor
UV LED RGB PhosphorBlue LED YAG Phosphor
White light emitting diodes
6
Study of Phosphor Thermal-Isolated Packaging Technologies for High- Power White
Light-Emitting Diodes
Bingfeng Fan Hao Wu Yu Zhao Yulun Xian and Gang Wang
bull Manuscript received February 12 2007 revised April 17 2007 The authors are with State Key Laboratory of Optoelectronic
Materials and Technologies Sun Yat-sen University Guangzhou 5102 China and also with
the School of Physics and Engineering Sun Yat-sen University Guangzhou 51027755 China (e-mail stswanggmailsysueducn)
Color versions of one or more of the figures in this letter are available online at httpieeexploreieeeorg
7
Fig Schematic cross-sectional view of (a) conventional phosphor converting white LED and (b) thermal-isolated phosphor-converting white LED h = 1 mm
Experiment
8
Fig Measured (red line closed symbols) and simulated (blue line open symbols) temperature profile along the phosphor surface midline in conventional packaging and thermal-isolated packaging (both without placing lens)
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
4
Introduction
Die attached
Epoxy curing
Wire bonding
Molding
Singluration
Testing
Sorting
5
Introduction
RGB LED Blue LED RG Phosphor
UV LED RGB PhosphorBlue LED YAG Phosphor
White light emitting diodes
6
Study of Phosphor Thermal-Isolated Packaging Technologies for High- Power White
Light-Emitting Diodes
Bingfeng Fan Hao Wu Yu Zhao Yulun Xian and Gang Wang
bull Manuscript received February 12 2007 revised April 17 2007 The authors are with State Key Laboratory of Optoelectronic
Materials and Technologies Sun Yat-sen University Guangzhou 5102 China and also with
the School of Physics and Engineering Sun Yat-sen University Guangzhou 51027755 China (e-mail stswanggmailsysueducn)
Color versions of one or more of the figures in this letter are available online at httpieeexploreieeeorg
7
Fig Schematic cross-sectional view of (a) conventional phosphor converting white LED and (b) thermal-isolated phosphor-converting white LED h = 1 mm
Experiment
8
Fig Measured (red line closed symbols) and simulated (blue line open symbols) temperature profile along the phosphor surface midline in conventional packaging and thermal-isolated packaging (both without placing lens)
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
5
Introduction
RGB LED Blue LED RG Phosphor
UV LED RGB PhosphorBlue LED YAG Phosphor
White light emitting diodes
6
Study of Phosphor Thermal-Isolated Packaging Technologies for High- Power White
Light-Emitting Diodes
Bingfeng Fan Hao Wu Yu Zhao Yulun Xian and Gang Wang
bull Manuscript received February 12 2007 revised April 17 2007 The authors are with State Key Laboratory of Optoelectronic
Materials and Technologies Sun Yat-sen University Guangzhou 5102 China and also with
the School of Physics and Engineering Sun Yat-sen University Guangzhou 51027755 China (e-mail stswanggmailsysueducn)
Color versions of one or more of the figures in this letter are available online at httpieeexploreieeeorg
7
Fig Schematic cross-sectional view of (a) conventional phosphor converting white LED and (b) thermal-isolated phosphor-converting white LED h = 1 mm
Experiment
8
Fig Measured (red line closed symbols) and simulated (blue line open symbols) temperature profile along the phosphor surface midline in conventional packaging and thermal-isolated packaging (both without placing lens)
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
6
Study of Phosphor Thermal-Isolated Packaging Technologies for High- Power White
Light-Emitting Diodes
Bingfeng Fan Hao Wu Yu Zhao Yulun Xian and Gang Wang
bull Manuscript received February 12 2007 revised April 17 2007 The authors are with State Key Laboratory of Optoelectronic
Materials and Technologies Sun Yat-sen University Guangzhou 5102 China and also with
the School of Physics and Engineering Sun Yat-sen University Guangzhou 51027755 China (e-mail stswanggmailsysueducn)
Color versions of one or more of the figures in this letter are available online at httpieeexploreieeeorg
7
Fig Schematic cross-sectional view of (a) conventional phosphor converting white LED and (b) thermal-isolated phosphor-converting white LED h = 1 mm
Experiment
8
Fig Measured (red line closed symbols) and simulated (blue line open symbols) temperature profile along the phosphor surface midline in conventional packaging and thermal-isolated packaging (both without placing lens)
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
7
Fig Schematic cross-sectional view of (a) conventional phosphor converting white LED and (b) thermal-isolated phosphor-converting white LED h = 1 mm
Experiment
8
Fig Measured (red line closed symbols) and simulated (blue line open symbols) temperature profile along the phosphor surface midline in conventional packaging and thermal-isolated packaging (both without placing lens)
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
8
Fig Measured (red line closed symbols) and simulated (blue line open symbols) temperature profile along the phosphor surface midline in conventional packaging and thermal-isolated packaging (both without placing lens)
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
9
bull Luminous flux (left y-axis) and CCT (right y-axis) dependence of input current for thermal-isolated white LED and conventional white LED
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
10
Improved Performance White LED
Nadarajah Narendran
Lighting Research Center Rensselaer Polytechnic Institute 21 Union St Troy NY 12180 wwwlrcrpiedu
bull Narendran N 2005 Improved performance white LED Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers
bull Copyright 2005 Society of Photo-Optical Instrumentation Engineers This paper was published in the Fifth International Conference on So
lid State Lightingbull Proceedings of SPIE and is made available as an electronic preprint
with permission of SPIE One print or electronic copy may be made for personal use only Systematic or multiple reproduction distribution to multiple locations via electronic or other means duplication of any material in this paper for a fee or for commercial purposes or modification of the content of the paper are prohibited
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
11
bull the 5 mm type phosphor-converted white LED degraded faster than the blue LED The main difference between a blue and a similar white LED is the phosphor that is dispersed within the epoxy surrounding the die
Figure Schematic of a 5 mm white LED
Figure Three LED arrays enclosed in an aluminum cylinder
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
12
Fig Lumen depreciation data for the three LED arrays at 40 mA
Three LED arrays enclosed in an aluminum cylinder Results
Glass Windowwith Phosphor coating degraded slower than others
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
13
Experiment
Figure White LED using SPE concept
SPE stands for ldquoScattered Photon Extraction
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
14
bull Comparison of traditional white LED efficacy with SPE white LED efficacy as a function of current
Results and discussion
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
15
bull SPE has enabled higher luminous efficacy with phosphor-converted white LEDs Unlike in traditional white LED packages in the SPE package the phosphor layer is placed at a remote location and the lens surrounding the die is shaped to extract a significant portion of the back-transferred light before it is absorbed and lost within the package
SUMMARY
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
16
Analysis of high-power packages for phosphor-based white-light-emitting diodes
Hong Luobull Department of Physics Applied Physics and Astronomy
Rensselaer Polytechnic Institute TroyNew York 12180
Jong Kyu Kim and E Fred Schuberta
Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNew York 12180
Jaehee Cho Cheolsoo Sone and Yongjo Park
Photonics Program Team Samsung Advanced Institute of Technology Suwon 440-600 South Korea
(Received 23 February 2005 accepted 10 May 2005 published online 8 June 2005)
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
17
bull FIG 1 Schematic cross-sectional view of the dichromatic white LED lamps with (a) phosphor-in-cup arrangement and (b) phosphor-on-top arrangement Three different geometries of the encapsulation dome flat (h=0) convex (h=r2) and hemispherical (h=r)
Experiment
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
18
bull Extraction efficiency of phosphorescence calculated by ray tracing for different package configurations
Results and discussion
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
19
Conclusion1 The high-performance phosphor-converting white LEDs wi
th thermal-isolated phosphor coating layer Compared with the conventional LEDs the new packaging showed a much higher saturation point of output luminous flux and provided an effective way to decrease the color variation
2 Using lsquothermal isolated packaging can reduce the effect of heat on phosphor and prolong the life of LED
3 The character of light extraction was Hemisphere gt Convex gt Flat
4 For the description above LED packaging can reach the best stability once it uses thermal isolated and Hemisphere packaging
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
20
References1 Bingfeng Fan Hao WuYu ZianYulun Xian and Gang Wang ldquo Study of Phosphor Thermal-Is
olated Packaging Technologies for High- Power White Light-Emitting Diodesrdquo IEEE PHOTONICS TEHNOLOGY LETTERS VOL 19 NO 15 AUGUST 1 2007
2 Narendran N ldquoImproved performance white LEDrdquo Fifth International Conference on Solid State Lighting Proceedings of SPIE 5941 45-50 Bellingham WA International Society of Optical Engineers 2005
3 Yutao Zhou MEMBER SPIE Nadarajah Narendran MEMBER SPIE Rensselaer ldquoPhotovoltaic-powered light-emitting diode lighting systemsrdquo Optical Engineering 4411 111311 November 2005
4 Hong Luo Jong Kyu Kim and E Fred Schubert ldquoAnalysis of high-power packages for phosphor-based white-light-emitting diodesrdquo APPLIED PHYSICS LETTERS 86 243505 (2005)
5 Rafael C Jordan Joumlrg Bauer and Hermann Oppermann rdquo Optimized heat transfer and homogeneous color converting for Ultra High Brightness LED Package Proc Of SPIE Vol 6198 61980B-1
21
Thanks for your attention
21
Thanks for your attention
