The Influence of Junction Temperature Variation of LED on the Lifetime Estimation During Accelerated Aging Test

doi:10.1109/access.2018.2885578

CIOMP OpenIR

	The Influence of Junction Temperature Variation of LED on the Lifetime Estimation During Accelerated Aging Test
	X.X.Wang; L.Jing; Y.Wang; Q.Gao; Q.Sun
	2019
发表期刊	Ieee Access
ISSN	2169-3536
卷号	7 页码:4773-4781
摘要	In this paper, seven LED lamps are selected to investigate how the junction temperature (Tj) of LED varies during the step-stress temperature accelerated aging test. The ambient temperatures are 80 degrees C and 70 degrees C for the first and second step of the aging test, respectively, and the total aging time is 2180 h. A non-contact method for monitoring junction temperatures of samples, by the ratio of white light energy to blue light energy (W/B), is applied. Experimental measurements show that the W/B ratio and Tj satisfy good linear relationship during the aging for all samples. Then, the junction temperatures are acquired at eight typical points of aging time which are used to eliminate the impact of Tj variation on the estimation of the decay rate and accelerated lifetime. It is shown that the estimated lifetime is longer than that acquired by the traditional method. The estimation errors of the accelerated lifetimes by the traditional method are in a range from 12.8% to 18.6% under the aging temperature of 80 degrees C and from 12.5% to 20.3% under the aging temperature of 70 degrees C for the seven samples. The estimation accuracy of the decay rates and accelerated lifetimes of LED lamps in the step-stress accelerated aging test is improved by the proposed methodology to a certain extent.
关键词	Life testing,lifetime estimate,light emitting diodes,white leds,degradation,reliability,depreciation,Computer Science,Engineering,Telecommunications
DOI	10.1109/access.2018.2885578
收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/62978
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	X.X.Wang,L.Jing,Y.Wang,et al. The Influence of Junction Temperature Variation of LED on the Lifetime Estimation During Accelerated Aging Test[J]. Ieee Access,2019,7:4773-4781.
APA	X.X.Wang,L.Jing,Y.Wang,Q.Gao,&Q.Sun.(2019).The Influence of Junction Temperature Variation of LED on the Lifetime Estimation During Accelerated Aging Test.Ieee Access,7,4773-4781.
MLA	X.X.Wang,et al."The Influence of Junction Temperature Variation of LED on the Lifetime Estimation During Accelerated Aging Test".Ieee Access 7(2019):4773-4781.

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