Evaluating the moisture resistance of Y3Al5O12: Ce3+ phosphor used in high power white LED packaging. (June 2021)

• Record Type: Journal Article
• Authors: Yuan, Weiyi; Fan, Jiajie; Dong, Linjun; Chen, Shanghuan; Fan, Xuejun; Zhang, Guoqi
• Is Part Of: Microelectronics and reliability. Volume 121(2021)
• Publication Date: 2021-06
• Subjects: Light-emitting diodes -- Phosphor -- Y3Al5O12:Ce3+ -- Hydrolysis reaction -- Moisture resistance -- Reliability; Electronic apparatus and appliances -- Reliability -- Periodicals; Miniature electronic equipment -- Periodicals; Appareils électroniques -- Fiabilité -- Périodiques; Équipement électronique miniaturisé -- Périodiques; Electronic apparatus and appliances -- Reliability; Miniature electronic equipment; Periodicals; 621.3815
• DOI: 10.1016/j.microrel.2021.114130
• Languages: English
• ISSNs: 0026-2714

Abstract

Abstract: Owing to its low cost and high efficiency, the blue light-emitting diode (LED) chip covered with the Y3 Al5 O12 :Ce 3+ (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. Highlights: The water-immersion test with in-situ electrical conductivity monitoring is conducted on YAG phosphor. YAG phosphor exhibits stable luminescence performance and crystal structure under long-term aging high moisture aging tests. YAG phosphor particle's surface roughness and self-heating effect are slightly enhanced after aging.