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Packaging Element Technology of White Power LEDs Element Technology of White Power LEDs LEDs that...

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Packaging Element Technology of White Power LEDs LEDs that require a lot of electric current, like lighting and headlamps, are called power LEDs. Combining various kinds of materials so that LED chips will shine well is called “packaging.” In this volume, we focus on the reliable packaging technology for white power LEDs that Stanley aims to achieve. It is important to have a proper understanding of what types of defects will occur and then decide specifications. We are quick to adopt new materials and advance development while conducting analyses jointly with material manufacturers. The brightness of LEDs has increased by 1.5-2.0 times compared to several years ago. However, that means a large amount of electric current is applied, which causes LEDs to deteriorate more quickly. We will therefore consider the ideal combination of materials. Stanley expertise is hidden here. What about street lights? We are quite at home in optical design Since organic materials like silicon are easily affected by heat, we are also developing all- inorganic LEDs that use only inorganic materials. We also challenge to collect the light emitted sideways to the front by pouring white resin (transparent resin and ceramics). Longer operating life! It is important to estimate exactly how much load should be placed. Even if materials are changed, it is impossible to assess whether or not that change was appropriate immediately unless the lifetime can be predicted. We choose materials to let out heat and surely conduct electricity so that the joins of the chip and ceramics and of ceramics and copper will never separate, even at high temperature. The ordinary test environment is 60 degrees C. Conducting a test at 70 degrees C increases the load twofold. Brightness has been improved! Are there any other things? High thermal conductive materials are used in a circuit board to promote heat loss. Test results We want to use this under these conditions! Based on various data, we will determine the product lifetime depending on a customer’s usage environment. The lifetime that is required for LEDs is approximately five years. We conduct tests under stricter conditions so that we can have the same results that we would get by spending five years. Turn on a lot of electric current Accurate prediction of product lifetime Acceleration experiment Material cementing material Ceramics Copper Perfectly joined! LED chip Ceramics Fluorescent substance Resin Copper Light goes away Light Light 80% 20% 100% White resin Light comes back Twofold 60 degrees C 70 degrees C Let’s discover! Packaging element technology Temperature Environment Brightness Impact It’s hot! The adhesive has come unglued! Under that circumstance, the product’s lifetime will be this much. Heat Heat White Power LED As the resin to encapsulate the fluorescent substance, we choose silicon that resists deterioration as much as possible. Cross-section of LED Precise specifications will lead to customers’ trust Trust Evaluation White power LEDs The resin is going to melt! Which is better? How about this? Customer We will ship the product to the market more quickly! All-inorganic LED All you have to do is to fix a glass lid! Headlamp Island I have been waiting for such LEDs! Although it is a time-consuming low-profile work, it is a very important technology to support Stanley’s trust. It is also possible for Stanley to apply the LEDs developed for automobiles to the electronics field. Island of street lights and lighting modules It supports this island.
Transcript

Packaging Element Technology of White Power LEDsLEDs that require a lot of electric current, like lighting and headlamps, are called power LEDs.

Combining various kinds of materials so that LED chips will shine well is called “packaging.” In this volume, we focus on the reliable packaging technology for white power LEDs that Stanley aims to achieve.

It is important to have a proper understanding of what types of defects wi l l occur and then decide specifications.

We are quick to adopt new materials and advance development while conducting analyses jointly with material manufacturers.

The brightness of LEDs has increased by 1.5-2.0 times compared to several years ago.However, that means a large amount of electric current is applied, which causes LEDs to deteriorate more quickly. We will therefore consider the ideal combination of materials. Stanley expertise is hidden here.

What about street lights?

We are quite at home in optical design Since organic

materials like silicon are easily affected by heat, we are also developing all-inorganic LEDs that use only inorganic materials.

We also challenge to collect the light emitted sideways to the front by pouring white resin (transparent resin and ceramics).

Longer operating life!

It is important to estimate exactly how much load should be placed.

E v e n i f m a t e r i a l s a r e changed, it is impossible to assess whether or not that change was appropriate immediately unless the lifetime can be predicted.

We choose materials to let out heat and surely conduct electricity so that the joins of the chip and ceramics and of ceramics and copper will never separate, even at high temperature.

The ordinary test environment is 60 degrees C. Conducting a test at 70 degrees C increases the load twofold.

Brightness has been improved!

Are there any other things?

High thermal conductive materials are used in a circuit board to promote heat loss.

Test results

We want to use this under these conditions!

Based on various data, we will determine the product lifetime depending on a customer’s usage environment.

The lifetime that is required for LEDs is approximately five years. We conduct tests under stricter conditions so that we can have the same results that we would get by spending five years.

Turn on a lot of electric current ➡

Accurate prediction of product lifetime

Acceleration experiment

Material

cementingmaterial

Ceramics

Copper

Perfectly joined!

LED chip

Ceramics

Fluorescent substance

Resin

Copper

Light goes awayLight

Light

80%

20%

100%

White resin Light comes backTwofold

60 degrees C

70 degrees C

Let’s discover!

Packaging element technology

Temperature

Environment

Brightness

Impact

It’s hot!

The adhesive has come unglued!

Under that circumstance, the product’s lifetime will be this much.

Heat

Heat

White Power LED

As the resin to encapsulate the fluorescent substance, we choose silicon that resists deterioration as much as possible.

Cross-section of LED

Precise specifications will lead to customers’ trust

Published by: General Affairs Section, General Affairs Department, Stanley Electric Co., Ltd.2-9-13, Nakameguro, Meguro-ku, Tokyo 153-8636Tel : (03) 3710-2222 Edited by : Tamotsu Tsuchiya Created by : Sangyo Henshu Center Co., Ltd.

Be friendly to the environment!This magazine is printed on recycled paper.

2009.Winter

No. 11

TrustEvaluation

White power LEDs

The resin is going to melt!

Which is better?

How about this?

Customer

We will ship the product to

the market more quickly!

All-inorganic LED

All you have todo is to fix aglass lid!

Headlamp Island

I have been

waiting for

such LEDs!

Although it is a time-consuming low-profile work, it is a very important technology to support Stanley’s trust.

It is also possible for Stanley to apply the LEDs developed for automobiles to the electronics field.

Island of street lights and lighting modules

It supports this island.

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