期刊
OPTICAL MATERIALS
卷 49, 期 -, 页码 79-84出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2015.07.026
关键词
Color shift; Microcellular PET; LED-based product; Lumen decay; Hydrolytic degradation
资金
- National High Technology Research and Development Program of China (863 Program) [2015AA03A101]
Microcellular PET is an emerging reflective material used for solid state lighting. This paper experimentally investigated its degradation mechanisms and quantified both lumen decay and color shift effects of LED-based products with this material aged under different conditions. The results show that: (1) A humidity test at 85 degrees C & 85%RH for 4000 h (or even shorter) can lead to hydrolytic degradation, which causes both the obvious inconsistent decrease of reflectivity and a severe embrittlement; (2) Oxidative degradation occurred at 85 degrees C for 4000 h can cause a slight reflectance spectrum change, while the additional blue light exposure has little impact; (3) Color shift induced by thermal aging at 85 degrees C for 4000 h is 0.0001 and lumen efficiency decreased by 1.57%. When Microcellular PET falls off due to the embrittlement during humidity test, the color shift increases to 0.0004 and the lumen efficiency is reduced by 4.47%. (C) 2015 Published by Elsevier B.V.
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