电-热应力对GaN基白光LED可靠性的影响

邹水平; 吴柏禧; 万珍平; 唐洪亮; 汤勇

doi:10.3788/fgxb20163701.0124

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电-热应力对GaN基白光LED可靠性的影响

发光学应用及交叉前沿 | 更新时间：2020-08-12

- 电-热应力对GaN基白光LED可靠性的影响
- Effect of Current-temperature Stress on The Reliability of GaN LED
- 发光学报 2016年37卷第1期页码：124-129
- 作者机构：
  
  华南理工大学机械与汽车工程学院,广东广州,510640
- 作者简介：
- 基金信息：
  
  国家自然科学基金委-广东省联合基金重点项目(U1401249)资助()
- DOI：10.3788/fgxb20163701.0124
  中图分类号： TN306
- 纸质出版日期：2016-1-10，
  
  收稿日期：2015-10-8，
  
  修回日期：2015-11-3，
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邹水平, 吴柏禧, 万珍平等. 电-热应力对GaN基白光LED可靠性的影响[J]. 发光学报, 2016,37(1): 124-129

ZOU Shui-ping, WU Bo-xi, WAN Zhen-ping etc. Effect of Current-temperature Stress on The Reliability of GaN LED[J]. Chinese Journal of Luminescence, 2016,37(1): 124-129
邹水平, 吴柏禧, 万珍平等. 电-热应力对GaN基白光LED可靠性的影响[J]. 发光学报, 2016,37(1): 124-129 DOI： 10.3788/fgxb20163701.0124.

ZOU Shui-ping, WU Bo-xi, WAN Zhen-ping etc. Effect of Current-temperature Stress on The Reliability of GaN LED[J]. Chinese Journal of Luminescence, 2016,37(1): 124-129 DOI： 10.3788/fgxb20163701.0124.

摘要

研究了电流和温度应力因子及其共同作用时对GaN基白光LED可靠性的影响

并从LED结构方面探究了各应力下LED的失效机理。结果表明

以电流作为加速应力时

荧光粉退化为其主要的失效方式

同时LED出光的相关色温上升

红色比减少;在热应力下

主要是LED芯片结构发生变化

峰值波长蓝移

光通量衰减

同时支架出现老化现象。电流和温度应力共同作用时

温度应力对LED光通量的影响大于电流应力。电-热应力下的光通量衰减大于电、热应力单独作用时的衰减之和

即电-热应力作用时

光衰不具有线性叠加性。

Abstract

The effects of current-temperature stress on the reliability of LED were investigated

and the failure mechanism was analyzed from the structure of LED. It is found that the current and temperature have different influences on the reliability of LED. When LEDs are applied current accelerating stress

the degradation of phosphor is the main failure mode which can cause the increasing of correlated color temperature and decreasing of red ratio. When LEDs are applied temperature accelerating stress

the structure of chip would change

which leads to the blueshift of peak wavelength. In addition

the structure of housing also appears aging at high temperature. The temperature stress has greater effect on the reliability than current stress when the current stress and temperature stress are applied together. The attenuation of luminous flux under current-temperature stress is greater than the sum of current and temperature stress working alone

which namely implies that the current and temperature stress do not have the features of linear superposition.

关键词

LED电流应力温度应力可靠性失效分析

Keywords

LEDcurrent stresstemperature stressreliabilityfailure analysis

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