大功率白光LED的寿命计算  

Lifetime Estimation of High-Power White LEDs

作　　者：林林[1] 庄国华[1] 黄珊珊[1] 刘玉滨[1] 郑秋萍[1] 林辉[1] 庄阿伟[1] 冯卓宏[1] 郑志强[1] 

机构地区：[1]福建师范大学物理与光电信息科技学院,福建福州350007

出　　处：《福建师大福清分校学报》2009年第B12期103-105,共3页Journal of Fuqing Branch of Fujian Normal University

基　　金：福建省科技重大专项课题(2007HJ0004-2);福建省青年人才创新项目(2007F3027);福建省科技厅K类项目(2006F5025);福建省教育厅B类项目(JB08063);福建师范大学本科生课外科技计划项目(BKL2009-007)

摘　　要：本文用电流加速老化实验法测试1W大功率白光LED光衰及寿命。发现光衰减存在两种过程:前期的缓慢衰减和后期的快速衰减。针对前期衰减通过指数拟合算出不同老化电流下的寿命,确认本批LED寿命和工作电流关系符合Eying模型,由此推得额定电流(350mA)下的寿命τ=1924h。In this paper,the current accelerated aging experiment was used to investigate the luminous attenuation and lifetime of the high-power white LEDs （1W）. Two kinds of luminous attenuation process were found：the slow attenuation at the early stage and the fast attenuation at the late stage. Moreover,the LED lifetimes with different operating currents were calculated by the exponential fitting of the slow luminous attenuation. The result implied that the Eying model was applicable for the relation between the lifetime and the operating current. Thus,the lifetime with standard current （350 mA） was calculated as 1924 h.

关 键 词：白光LED 大功率 电流加速老化 寿命 

分 类 号：TN383.1[电子电信—物理电子学]