Issue 32, 2021

Novel high-thermal-conductivity composite ceramic phosphors for high-brightness laser-driven lighting

Abstract

The widespread application of laser diodes (LDs) in high-brightness lighting is limited by the insufficient heat dissipation of colour converters due to high-power laser irradiation. In this study, a novel MgO–YAG:Ce composite ceramic with excellent optical and thermal properties was fabricated by hot pressing. The thermal conductivity of the MgO–YAG:Ce composite ceramic is 14–21% higher than that of the Al2O3–YAG:Ce composite ceramic in the temperature range of 25–200 °C. When pumped by blue LDs with 1 W mm−2, the MgO–40 vol% YAG:Ce composite ceramic produces white light with a luminous efficacy of 292 lm W−1. Moreover, it exhibits a luminous saturation threshold of as high as 32.2 W mm−2 and a maximal luminous flux of 3979 lm. These results indicate that MgO–YAG:Ce composite ceramic is a promising phosphor converter for high-power laser-driven lighting.

Graphical abstract: Novel high-thermal-conductivity composite ceramic phosphors for high-brightness laser-driven lighting

Supplementary files

Article information

Article type
Paper
Submitted
12 May 2021
Accepted
15 Jul 2021
First published
19 Jul 2021

J. Mater. Chem. C, 2021,9, 10487-10496

Novel high-thermal-conductivity composite ceramic phosphors for high-brightness laser-driven lighting

H. Zhao, H. Yu, J. Xu, M. Zhang, X. Li and X. Sun, J. Mater. Chem. C, 2021, 9, 10487 DOI: 10.1039/D1TC02202D

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