Evaluating the moisture resistance of Y3Al5O12: Ce3+ phosphor used in high power white LED packaging

Weiyi Yuan, Jiajie Fan, Linjun Dong, Shanghuan Chen, Xuejun Fan, Guoqi Zhang

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Owing to its low cost and high efficiency, the blue light-emitting diode (LED) chip covered with the Y3Al5O12:Ce3+ (YAG) phosphor has become a mainstream technology of high power white LED packaging. However, phosphors are often susceptible to degradation under high-temperature and high-humidity conditions, which directly affects the optical and color stability of the white LED package. In this study, the moisture resistance of YAG phosphor was evaluated through both a short-term water-immersion test and long-term aging tests, i.e. 85 °C&85% Relative Humidity (RH) test and high-temperature and saturated humidity test. The phosphor hydrolysis mechanism was then revealed by characterizing the phosphor emission spectrum, photothermal property, crystal structure, micromorphology, and chemical element composition.

Original languageEnglish
Article number114130
JournalMicroelectronics Reliability
Volume121
DOIs
Publication statusPublished - 2021

Keywords

  • Hydrolysis reaction
  • Light-emitting diodes
  • Moisture resistance
  • Phosphor
  • Reliability
  • YAlO:Ce

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