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Thomas Baumann, Cynora

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www.CYNORA.com Dr. Thomas Baumann DOE SSL February 2016 Blue TADF emitters for efficient Display & Lighting
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Page 1: Thomas Baumann, Cynora

www.CYNORA.com

Dr. Thomas Baumann

DOE SSL February 2016

Blue TADF emitters for efficient Display & Lighting

Page 2: Thomas Baumann, Cynora

www.CYNORA.com 2

AMOLED has already ~20% display market share and is enabling new applications.

AMOLED is gaining traction

February 2016

Page 3: Thomas Baumann, Cynora

www.CYNORA.com 3

The power consumption of AMOLED displays needs to be further reduced.

Display efficiency

February 2016

• Example Samsung Galaxy Series

o Display power consumption has been constantly decreasing over time

o Relative decrease in power consumption by 20-40% in each generation

o Accompanied by decrease in active pixel area

0

0.5

1

1.5

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2.5

3

S1 S2 S3 S4 S5 S6

0

100

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300

400

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Dis

pla

y p

ow

er

co

nsm

pti

on

(a

vg.)

[W

]

Samsung Galaxy Model

pp

i

ppi Display power consumption

*

*Source: Samsung,

Page 4: Thomas Baumann, Cynora

www.CYNORA.com 4

The display efficiency strongly depends on the blue emitter system.

2 stack architectures – 1 common challenge

February 2016

Emitting Layer

Color Filter

Direct RGB WOLED + CF

RGB W-RGBW

BLUE PIXEL AREA

Direct RGB WOLED + CF

52% 50%

PIXEL EFFICIENCY

• R/G (RGB) and YG (WOLED+CF) EMLs are significantly more efficient than BLUE

• BLUE pixel efficiency around 5% EQE

* *

*Sources: Samsung, LG

Page 5: Thomas Baumann, Cynora

www.CYNORA.com 5

An efficiency improvement of 1.7x – 2.1x is possible in currently used display architectures.*

Display power efficiency vs. EQE blue

February 2016

1.00

1.20

1.40

1.60

1.80

2.00

5 10 15 20 25

Imp

rove

me

nt

facto

r

cd/A @ CIE 0.14/0.12

1.00

1.20

1.40

1.60

1.80

2.00

2.20

5 10 15 20 25

Imp

rove

me

nt

facto

r

cd/A @ CIE 0.14/0.12

Example: Power consumption at 350 nits

Example: Power consumption at APL 20 WOLED+CF

Direct RGB

1.5 W < 0.9 W

EQE 5% EQE 25% x 1.7

185 W 88 W

EQE 5% EQE 25% x 2.1

*

*

*Sources: Displaymate, Samsung, LG

Page 6: Thomas Baumann, Cynora

www.CYNORA.com 6

Fluorescence Phosphorescence TADF

CYNORA’s TADF technology is the best approach for highly efficient blue emission.

Our approach: TADF for blue emitters

February 2016

• Singlet emission

• Triplets decay non-

radiatively

• 25 % IQE

• Triplet emission

• Singlets converted to triplets

by ISC

• Up to 100 % IQE

• Singlet emission

• Triplets converted to singlets by RISC

enabled due to low DEST

• Up to 100 % IQE

• Enables deeper blue emission at identical

excitation energy

Page 7: Thomas Baumann, Cynora

www.CYNORA.com 7

Efficiency 57 cd/A

Blue OLED 10 cd/A

Basic material patents granted (EP)

2nd financing series

Efficiency 5 cd/A

Luminance 5,000 cd/m2

First patent application

First multilayer device

40+ patents filed

2008 2009 2013 2010 2011 2012

2014

A-round B1-round B2-round

Funding rounds

3rd party product validation: positive test results

2015

CYNORA’s aspiration is to be the leading supplier of efficient next generation blue emitter systems.

February 2016

Emitters for solution-based OLEDs

VTE-Emitters for OLEDs

B3-round

2016

CYNORA sharpened its focus to VTE emitter development

Page 8: Thomas Baumann, Cynora

www.CYNORA.com 8

Synthesis only performed for high-potential blue emitter families.

Efficient TADF material design

February 2016

• Basic material properties can be predicted with computational model

o Synthesis only after successful pre-screening

• Property prediction of new materials based on specially designed

simulation approach

o Charge transfer excitation

o Distinct design rules for efficient TADF emitters

o 5 derived parameters established

• Verification

o System has been confirmed by literature-known emitters

o Constant benchmarking

HOMO

LUMO

Page 9: Thomas Baumann, Cynora

www.CYNORA.com 9

Focus on blue VTE materials

Commitment to blue and deep blue

February 2016

0

10

20

30

40

50

60

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Jan

Fe

b

Ma

r

Ap

r

Ma

y

Jun

Jul

Au

g

Se

p

Oct

No

v

De

c

nu

mb

er

of

ma

teri

als

new emitters in 2015

BLUE SKYBLUE

Page 10: Thomas Baumann, Cynora

www.CYNORA.com 10

TADF involves an emitter system of emitter and host.

Material & Device Development

February 2016

• Development of efficient TADF emitters

o High PLQY

o Short excited state lifetime

o For Blue: right CIE coordinates

• TADF integration into existing stack architectures

o Host material selection

o Blocking layer / transport layer adjustments

o Commercial devices as starting point for stack

design

• Stack development and screening

o Material evaluation partnerships with material

suppliers and panel makers

Page 11: Thomas Baumann, Cynora

www.CYNORA.com 11

Deep blue emission and high efficiency can be combined.

Blue material performance: cyEBV-044

February 2016

Emitter cyEBV-044 Device

performance

Power Efficiency 7.8 lm/W

Current Efficiency 13.8 cd/A

CIE 0.16 / 0.17

EQE (max.) 10.1%

Blue emitter family

Deep blue emission

Good color point

Vacuum-process

Page 12: Thomas Baumann, Cynora

www.CYNORA.com 12

CYNORA‘s sky-blue emitter catching up with phosphorescent materials.

Blue material performance: cyEBV-046

February 2016

Emitter cyEBV-046 Device

performance

Power Efficiency 25 lm/W

Current Efficiency 42 cd/A

CIE 0.19 / 0.36

EQE (max.) 18%

Blue emitter family

Sky-blue emission

Lower HOMO level

Shorter excited state lifetime

Vacuum-process

Page 13: Thomas Baumann, Cynora

www.CYNORA.com 13

TADF EMLs need to be implemented as a system with realistic boundary conditions.

Stack improvements

• CYNORA is screening many emitter/host combinations

• Energy level alignment

o HOMO/LUMO

o Triplet level (T1) matching

• Host materials selection critical for high energy emission

o Compatibility with TADF emission (charge transfer)

o Energy/exciton transfer characteristics

o Color coordinate of EML blend

• Transport layers

o Optimization of turn-on voltage Von

o Charge balance

February 2016

Page 14: Thomas Baumann, Cynora

www.CYNORA.com 14

Cu2X2 complex, green emission, solution processed

CYNORA’S Solution Approach

February 2016

• Solution processed OLED

• Hybrid device layout

o All layers including EML by solution processing

o ETL and cathode by PVD

• Highly efficient

o Von = 2.7 V

o CE > 70 cd/A @ 100 cd/m²

o Lmax > 10,000 cd/m²

Page 15: Thomas Baumann, Cynora

www.CYNORA.com 15

CYNORA is actively expanding its network by means of collaborations and partnerships.

Partners & Projects

• International cooperation with universities

• German-funded project for the development of novel OLED materials

• German-funded project for the development of novel OLED processing methods

• EU-funded project for the development of novel materials combinations for large area tunable white OLEDs

February 2016

Page 16: Thomas Baumann, Cynora

February 2016

Thank you!


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