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

Qingsong Song Xiaodong Xu Jian Liu 1 Xiangshai Bu Dongzhen Li Peng Liu 2 Yinzhen Wang Jun Xu 3 Kheirreddine Lebbou 4
1 Curtin University [Perth]
2 Penn State - Pennsylvania State University
3 Georgia Institute of Technology [Atlanta]
4 ILM - Institut Lumière Matière [Villeurbanne]
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.
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https://hal-univ-lyon1.archives-ouvertes.fr/hal-02367594
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Submitted on : Monday, November 18, 2019 - 9:53:29 AM
Last modification on : Tuesday, November 19, 2019 - 2:38:44 AM

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UNIV-LYON1 | ILM | CNRS | UDL

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Qingsong Song, Xiaodong Xu, Jian Liu, Xiangshai Bu, Dongzhen Li, et al.. Structure and white LED properties of Ce-doped YAG-Al 2 O 3 eutectics grown by the micro-pulling-down method. CrystEngComm, Royal Society of Chemistry, 2019, 21 (31), pp.4545-4550. ⟨10.1039/c9ce00703b⟩. ⟨hal-02367594⟩

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