Journal
JOURNAL OF ADVANCED CERAMICS
Volume 12, Issue 3, Pages 625-633Publisher
TSINGHUA UNIV PRESS
DOI: 10.26599/JAC.2023.9220710
Keywords
LuAG:Ce/Al2O3 composite ceramics (LACCs); luminescence saturation; luminous efficacy; high-luminance laser lighting
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The aim of this study is to develop LuAG:Ce/Al2O3 composite ceramics (LACCs) with a high saturation threshold for high-luminance laser lighting. LACCs possess small thermal quenching, high quantum yield, and excellent luminescence properties. With these favorable properties, the designed LACCs show great potential in high-luminance laser lighting.
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 degrees C), 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.
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