期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 1, 页码 735-740出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.09.006
关键词
YAG:Ce ceramic; Light scattering; Luminescent ceramic; Transparent ceramic
资金
- National Natural Science Foundation of China [51702339]
- National Key Research and Development Program of China [2017YFB 0403100, 2017YFB0403105]
- Preeminence Youth Science Funds of Zhejiang Province [LR19F050001]
By forming a composite with Ce-free YAG phase and taking advantage of light scattering effect from slightly different refractive indices between the two phases, the sintered YAG:Ce-YAG ceramic exhibits excellent performance in transparency and light extraction efficiency.
Yellow-emitting YAG:Ce transparent ceramic is recognized as an ideal color converter in high-power blue LEDs and LDs, but the absence of scattering centers in its microstructure leads to a low light extraction efficiency and poor light uniformity. Here, taking advantage of the scattering effect and the transparency of YAG:Ce ceramics, Ce-free YAG phase was used as a second component to form a composite with YAG:Ce phosphor. The sintered YAG:Ce-YAG ceramic possessed a high transparency of similar to 63 % and a thermal conductivity of 8.9 Wm(-1) K-1. Due to its beneficial thermal properties and high external quantum efficiency of 70.2 %, the YAG:Ce-YAG ceramic could be excited under a high blue-laser flux density of up to 9.60 W/mm(2) and showed a luminous emittance of 1220 lm/mm(2). Due to light scattering arising from the slightly different refractive indices of the two phases, the designed YAG:Ce-YAG ceramic showed better lighting effects than a single-phase transparent YAG:Ce ceramic.
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