Investigation on the aging characteristics of high-power white LEDs under different stresses

Jing Yan; Zhendong Shang; Jianxin Chen

doi:10.1117/12.852010

25 November 2009 Investigation on the aging characteristics of high-power white LEDs under different stresses

Jing Yan, Zhendong Shang, Jianxin Chen

Proceedings Volume 7635, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy; 76350B (2009) https://doi.org/10.1117/12.852010
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China

Abstract

We used two types of 1-W white LEDs, both of which had the structure of GaN chip with phosphor covered and packaged in metal PCB boards with laminated aluminum. Of the two types of packaging lens, one is made of hard silica gel, and the other is made of soft plastic. The purpose of this paper is to analyze the aging characters of high-power white LEDs under stresses. In accelerated life tests, the two types of white LEDs were treated with high temperature and DC current distinctively. The tendencies of the decay of luminous flux in the two conditions were basically the same, while the changing trends of the color temperature were different. The hard silica gel had better stability.

Citation Download Citation

Jing Yan, Zhendong Shang, and Jianxin Chen "Investigation on the aging characteristics of high-power white LEDs under different stresses", Proc. SPIE 7635, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy, 76350B (25 November 2009); https://doi.org/10.1117/12.852010

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