Composition and luminescence properties of highly robust green-emitting LuAG:Ce/Al 2O 3 composite phosphor ceramics for high-power solid-state lighting

• DOI: 10.26599/jac.2023.9220710
• Publication Date: 2023-02-14T09:26:38Z
• Authors: Ziqiu Cheng; Xin Liu; Xinrong Chen; Jian Xu; Yanbin Wang; Tengfei Xie; Lexiang Wu; Zhengfa Dai; Guohong Zhou; Jun Zou; Jiang Li
• Keywords: TP785-869; luag:ce/al2o3 composite ceramics (laccs); luminescence saturation; high-luminance laser lighting; Clay industries. Ceramics. Glass; luminous efficacy; 02 engineering and technology; 0210 nano-technology

The major advantage of laser lighting over white light-emitting-diode is the possibility to achieve ultra-high luminance. However, phosphors usually suffer laser-induced luminescence saturation, which limits the peak luminance of laser lighting devices. The aim of the present study is to develop LuAG:Ce/Al2O3 composite ceramics (LACCs) with a high saturation threshold for high-luminance laser lighting. Owning to the rigid crystal structure, proper synthetic process, and optimized thermal design, the LACCs possess small thermal quenching (16% loss in luminescence at 225 ℃), high quantum yield (> 95%), and excellent luminescence properties. When the LACCs are irradiated by blue laser diodes in a reflection mode, a high luminous flux of 4634 lm and luminous efficacy of 283 lm·W−1 are realized. Furthermore, they show no sign of luminescence saturation even when the power density reaches 20.5 W·mm−2. With these favorable properties, the designed LACCs show great potential in high-luminance laser lighting.