Evaluating the moisture resistance of Y3Al5O12

Ce3+ phosphor used in high power white LED packaging

Journal article (2021)

Authors

Weiyi Yuan Hohai University
J. Fan Electronic Components, Technology and Materials - EEMCS , Changzhou Institute of Technology Research for Solid State Lighting, Fudan University
Linjun Dong Changzhou Institute of Technology Research for Solid State Lighting, Hohai University
Shanghuan Chen Hohai University, Changzhou Institute of Technology Research for Solid State Lighting
X. Fan Lamar University
Kouchi Zhang Electronic Components, Technology and Materials - EEMCS
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
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Published Date

2021

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

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.

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