Failure Mechanism Analysis of Negative Electrode in GaN-based White LED

XIA Yun-yun; WEN Shang-sheng; FANG Fang

doi:10.3788/fgxb20163708.1002

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Failure Mechanism Analysis of Negative Electrode in GaN-based White LED

更新时间：2020-08-12

- Failure Mechanism Analysis of Negative Electrode in GaN-based White LED
- Chinese Journal of Luminescence Vol. 37, Issue 8, Pages: 1002-1007(2016)
- 作者机构：
  
  1. 华南理工大学高分子光电材料与器件研究所,广东广州,510640
  2. 华南理工大学发光材料与器件国家重点实验室,广东广州,510640
  3. 广东金鉴检测科技有限公司, 广东广州 511300
- 作者简介：
- 基金信息：
- DOI：10.3788/fgxb20163708.1002
  CLC： TN383+.1
- Received：28 February 2016，
  
  Revised：11 April 2016，
  
  Published：05 August 2016
- 稿件说明：
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夏云云, 文尚胜, 方方. GaN基白光LED电极的失效机制[J]. 发光学报, 2016,37(8): 1002-1007

XIA Yun-yun, WEN Shang-sheng, FANG Fang. Failure Mechanism Analysis of Negative Electrode in GaN-based White LED[J]. Chinese Journal of Luminescence, 2016,37(8): 1002-1007
夏云云, 文尚胜, 方方. GaN基白光LED电极的失效机制[J]. 发光学报, 2016,37(8): 1002-1007 DOI： 10.3788/fgxb20163708.1002.

XIA Yun-yun, WEN Shang-sheng, FANG Fang. Failure Mechanism Analysis of Negative Electrode in GaN-based White LED[J]. Chinese Journal of Luminescence, 2016,37(8): 1002-1007 DOI： 10.3788/fgxb20163708.1002.

摘要

对负电极脱落造成白光LED失效进行了研究。结合扫描电子显微镜（SEM）和能谱分析（EDS）对退化样品芯片进行了表面形貌表征和微区成分分析。SEM观察到退化样品负极脱落处表面粗糙不平，且透明导电薄膜存在颗粒状结晶。经EDS检测发现负极脱落处存在腐蚀性氯元素，并在封装胶中检测出氯。分析认为，封装胶中残留的氯离子与负极中Al层发生的电化学腐蚀是致使样品失效的主要原因。

Abstract

The failure mechanism of white LED negative electrode shedding phenomenon was investigated. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used as two main techniques to characterize the surface morphology and composition of the chip. SEM shows that the surface of negative electrode dropped off is coarse

and granular crystals are formed in the transparent conductive film. Chlorine element has been detected in both corroded negative electrode part and the packaging glue by EDS testing. It is found that the electrochemical corrosion between chloridion and aluminum is the main reason to result in LED failure.

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references

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