Degradation of Microcellular PET reflective materials used in LED-based products
Source abstract
Abstract
Abstract 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 °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 °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 °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%.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: GaN-based semiconductor devices and materials · Advanced Sensor and Energy Harvesting Materials · Organic Light-Emitting Diodes Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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