大功率白光LED电流应力可靠性测试

Electric Current Stress Reliability Test of High-power White LED

摘要: 为了测试大功率白光LED的可靠性,对1 W和3 W大功率白光LED进行各3组以电流为应力的可靠性试验.试验结果表明:影响大功率白光LED可靠性的主要因素为结温和荧光粉失效;大功率白光LED缓变失效过程中,光通量下降的幅度为15%~20%;试验开始阶段存在“催化升高”现象;降低pn结到环境的热阻并且改进材料生长工艺,能有效地减少非辐射复合几率,提高发光效率.

Abstract: In order to conduct the reliability test of LEDs,experiments,which the electric current was token as the stress,were carried on 3 groups of 1 W and 3 W white-light LEDs respectively.The experiment results show that the main factors which influence the reliability of the high-power LEDs,are temperature of junction and phosphor powder invalidation.In the process of slow invalidation,the luminous flux rate declined between 15%and 20%,and the phenomenon of“the catalysis enhance”occurred at the beginning of the process.To reduce resistance from the p-n junction to the environment and to improve the material growth technology can more effectively reduce the risk of non-radiation and improve luminous efficiency.