Phosphor–silicone interaction effects in high power white light emitting diode packages

Jiajie Fan, Mengni Zhang, Xiao Luo, Cheng Qian, Xuejun Fan, Aimin Ji, Guoqi Zhang

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

As a widespread application of high power phosphor-converted white light emitting diodes (pc-WLEDs) with long lifetime and color-consistence, the highly reliable phosphor/silicone composite, one of core materials used for light-conversion, working under severe operation conditions has become increasingly necessary. This paper selects three widely used monochromatic phosphors (Aluminates, Silicates and Nitrides based) as well as a pristine silicone to determine the potential interaction effects in their phosphor/silicone composites operated under different environments. Firstly, the transient thermal quenching and long-term high temperature ageing tests are used to investigate the thermal stabilities of both monochromatic phosphor powders and phosphor/silicone composites. Furthermore, the degradation mechanisms of phosphor/silicone composites aged under the high temperature & blue light exposure and high temperature & high humidity conditions are studied by considering the interaction effect. The results show that: (1) the thermal stabilities of different phosphors are different and the phosphor/silicone composites have more severe thermal quenching effects than those of their corresponding phosphor powders, but with the similar degradation trends; (2) the blue light irradiation can deteriorate silicone which is related to the photolysis effect; (3) the moisture can accelerate the degradation of phosphor/silicone composites because the change of pH condition, owing to the dissolution of phosphor powders in moisture, can degrade both phosphors and silicone.
Original languageEnglish
Pages (from-to)17557–17569
Number of pages13
JournalJournal of Materials Science: Materials in Electronics
Volume28
Issue number23
Publication statusPublished - 2017

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