Failure Analysis of a Phosphor-Converted White Light-Emitting Diode due to the CaS:Eu Phosphor
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概要
- 論文の詳細を見る
To improve the longevity of phosphor-converted white light-emitting diode (LED), CaS:Eu red phosphor is usually coated by SiO2. The coating characteristics such as moisture resistance were found to be excellent and critically dependent upon the processing variables such as precursor concentration, pH value, and the temperature of the solution in case of the sol–gel process. Very interestingly, even though SiO2-coated CaS:Eu phosphor shows very strong moisture resistance, longevity of white LED is not improved that much when the coated phosphor applied to LED chip. Our consecutive experimental results show that the CaS:Eu particle is decomposed provoking a H2S gas release and silver pad under the chip is damaged by the H2S gas, which leads to the decrease of reflectivity and consequently luminance from the LED.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2008-05-25
著者
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Kim Jin
School Of Biotechnology & Bioengineering Kangwon National University
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Shin Hyun
School of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodaemoon-gu, Seoul 120-749, Korea
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Kim Jin
School of Chemical Engineering and Materials Science, Chung-Ang University, 221 Huksuk-dong, Dongjak-gu, Seoul 156-756, Korea
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Han Bo
School of Chemical Engineering and Materials Science, Chung-Ang University, 221 Huksuk-dong, Dongjak-gu, Seoul 156-756, Korea
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Yoo Jae
School of Chemical Engineering and Materials Science, Chung-Ang University, 221 Huksuk-dong, Dongjak-gu, Seoul 156-756, Korea
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Kim Jin
School of Advanced Materials Science and Engineering and Center for Advanced Plasma Surface Technology, Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Korea
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Shin Hyun
School of Chemical Engineering and Materials Science, Chung-Ang University, 221 Huksuk-dong, Dongjak-gu, Seoul 156-756, Korea
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