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

Qingsong Song (1) , Xiaodong Xu (1) , Jian Liu (1) , Xiangshai Bu (1) , Dongzhen Li (1) , Peng Liu (1) , Yinzhen Wang (2) , Jun (jim) Xu (3) , Kheirreddine Lebbou (4)

1 School of Physics and Electronic Engineering
2 South China Normal University
3 Tongji University
4 ILM - Institut Lumière Matière [Villeurbanne]

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 D_uv 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.

Domaines: Physique [physics]; Chimie; Sciences de l'ingénieur [physics]

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, 2019, 21 (31), pp.4545-4550. ⟨10.1039/c9ce00703b⟩. ⟨hal-02367594⟩