Properties of transparent Ce:YAG ceramic phosphors for white LED
Properties of transparent Ce:YAG ceramic phosphors for white LED
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DOI：
10.1016/j.optmat.2010.06.005
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发表时间：
2011-03-01
影响因子：
3.9
通讯作者：
Fujimoto, Y.
中科院分区：
文献类型：
--
作者：
Nishiura, S.;Tanabe, S.;Fujimoto, Y.
以氢氧化物共制备法制备的氧化物粉体为原料，合成了透明Ce：YAG陶瓷荧光粉。由于Ce（3+）的5d -> 4f跃迁，Ce：YAG陶瓷在530 nm处有较宽的发射带。所得样品在800 nm处的透过率为70-87%。Ce（3+）的吸收系数和发射强度随厚度的增加而增加。在465 nm LED激发下，Ce：YAG陶瓷的色坐标随着样品厚度的增加从蓝色区域向黄色区域移动，并在色度图中通过理论白色点附近。陶瓷白色LED的最高发光效率值为73.5 lm/W。(C)2010 Elsevier B. V.保留所有权利。
Transparent Ce:YAG ceramic phosphors were synthesized from the oxide powder which was produced by co-preparation method of the hydroxides. The Ce:YAG ceramics had a broad emission band peaked at 530 nm due to the 5d -> 4f transition of Ce(3+). The transmittances of the samples obtained were 70-87% at 800 nm. The absorption coefficient and emission intensity of Ce(3+) were increased with increasing thickness. Under 465 nm LED excitation, the color coordinates of the Ce:YAG ceramics shifted from the blue region to yellow region with increasing sample thickness, passing nearby the theoretical white point in the chromaticity diagram. The highest value of luminous efficacy of the ceramic white LED was 73.5 lm/W. (C) 2010 Elsevier B.V. All rights reserved.