1. Structure and white LED properties of Ce-doped YAG-Al2O3 eutectics grown by the micro-pulling-down method.
- Author
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Song, Qingsong, Xu, Xiaodong, Liu, Jian, Bu, Xiangshai, Li, Dongzhen, Liu, Peng, Wang, Yinzhen, Xu, Jun, and Lebbou, Kheirreddine
- Subjects
- *
PHOSPHORS , *HYPEREUTECTIC alloys , *EUTECTICS - Abstract
A series of Ce-doped YAG-Al2O3 eutectics were grown by the micro-pulling-down (μ-PD) method, for the purpose of high power white light emitting diodes. The eutectic structure was investigated. A calibrated integrating sphere spectrometer setup was used to measure the white LED properties of eutectic samples. The CIE color coordinates can be regulated easily by altering the Ce3+ doping concentration and sample thickness of the Ce:YAG-Al2O3 eutectics. A 1 W white LED device based on Ce:YAG-Al2O3 eutectics at a rated current of 350 mA emitted a bright white light with a CIE coordinate of (0.319, 0.334), a luminous efficacy of 83.0 lm W−1 and a Duv value of 0.003. The results showed that Ce:YAG-Al2O3 eutectics have better luminescence properties than commercial powder phosphors at a high current density. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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