1. Fabrication of Al2O3[sbnd]GAGG:Ce composite ceramic phosphors with excellent color quality for high-power laser-driven lighting.
- Author
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Zhao, Huanyu, Xu, Jian, Li, Jinsheng, Liu, Shimeng, Zhang, Mu, Jiang, Zhi, Chen, Xinrong, and Sun, Xudong
- Subjects
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CERAMICS , *ALUMINUM oxide , *PHOSPHORS , *COLOR temperature , *THERMAL conductivity , *REDSHIFT - Abstract
The application of high-power laser-driven lighting is limited by the insufficient heat dissipation of phosphor converters and the poor color quality of white light. In this study, the Al 2 O 3 (Gd,Ce) 3 (Al,Ga) 5 O 12 (Al 2 O 3 GAGG:Ce) composite ceramics were designed to improve thermal performance of phosphors, while maintaining excellent color rendering under high-power laser excitation. Dense composite ceramics were fabricated by pre-sintering at 1600 °C in air followed by HIP at 1700 °C through the investigation of the phase evolution and sintering process. The emission spectrum of GAGG:Ce shows a red shift of 31 nm and a high full width at half maximum (FWHM) of 128 nm. Meanwhile, the thermal conductivity was increased to 13.2 W·m−1K−1 by addition of Al 2 O 3 , which is 72% higher than that of single-phase GAGG:Ce ceramic. Therefore, warm white light with high color rendering index (CRI) of 71.4 and low correlated color temperature (CCT) of 4352 K was attained under excitation of high-power LDs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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