Electric current stress reliability test of high-power white LED

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.