Transparent Ce3+:GdYAG ceramic phosphors for white LED

Shotaro Nishiura; Setsuhisa Tanabe; Kana Fujioka; Yasushi Fujimoto

doi:10.1117/12.874118

23 February 2011 Transparent Ce³⁺:GdYAG ceramic phosphors for white LED

Shotaro Nishiura, Setsuhisa Tanabe, Kana Fujioka, Yasushi Fujimoto

Proceedings Volume 7934, Optical Components and Materials VIII; 793404 (2011) https://doi.org/10.1117/12.874118
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

Transparent Ce:GdYAG ceramics were synthesized from the oxide powder produced by a co-preparation method in the composition of (Gd_γY_0.999-γCe_0.001)₃Al₅O₁₂. The sample showed transparency as high as 80 % at 800 nm. A broad emission band of Ce³⁺: 5d→4f transition shifted from 530 nm to 560 nm with increasing Gd content. The color coordinates (x, y) under blue LED excitation and quantum yield (QY) were evaluated with an integrating sphere. The color coordinates of the sample under blue LED excitation were increased with increasing thickness. By substituting Gd³⁺ for Y³⁺, the color coordinates also shifted to lower right and became closer to the Planckian locus in the chromaticity diagram. The red shift was explained by the energy change of 5d level of Ce³⁺ by the substitution of Gd³⁺for Y³⁺. With increasing excitation wavelength, the color coordinates of the γ=0 sample shifted from blue to yellow. This result is related to the shape of excitation band of the sample. The QY of the γ=0 sample was almost excitation wavelength independent in the range of 400 ~470 nm.

Citation Download Citation

Shotaro Nishiura, Setsuhisa Tanabe, Kana Fujioka, and Yasushi Fujimoto "Transparent Ce³⁺:GdYAG ceramic phosphors for white LED", Proc. SPIE 7934, Optical Components and Materials VIII, 793404 (23 February 2011); https://doi.org/10.1117/12.874118

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