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Structure and white LED properties of Ce-doped YAG-Al 2 O 3 eutectics grown by the micro-pulling-down method

A series of Ce-doped YAG-Al 2 O 3 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 eutec...

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Bibliographic Details
Published in:CrystEngComm 2019-08, Vol.21 (31), p.4545-4550
Main Authors: Song, Qingsong, Xu, Xiaodong, Liu, Jian, Bu, Xiangshai, Li, Dongzhen, Liu, Peng, Wang, Yinzhen, Xu, Jun, Lebbou, Kheirreddine
Format: Article
Language:English
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Summary:A series of Ce-doped YAG-Al 2 O 3 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 Ce 3+ doping concentration and sample thickness of the Ce:YAG-Al 2 O 3 eutectics. A 1 W white LED device based on Ce:YAG-Al 2 O 3 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 D uv value of 0.003. The results showed that Ce:YAG-Al 2 O 3 eutectics have better luminescence properties than commercial powder phosphors at a high current density.
ISSN:1466-8033
1466-8033
DOI:10.1039/C9CE00703B