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Proceedings Paper

White light LED based on YAG:Ce3+ and YAG:Ce3+,Gd3+ phosphor
Author(s): Ke Li; Changyu Shen
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Paper Abstract

YAG:Ce3+ and a yellow-orange phosphor YAG:Ce3+,Gd3+ were prepared by solid-state reaction. Excitation spectrum of YAG:Ce3+ was composed of two bands peaking at 335nm and 460nm. Emission band of YAG:Ce3+ peaking at 532nm corresponds to the 5d-->4f transition of Ce3+.The emission peak wavelength of YAG:Ce3+,Gd3+ shifted to longer wavelength with the increasing of the concentration of Gd3+. White LED was obtained by combining GaN(460nm) chip with different ratios of phosphor YAG:Ce3+ and YAG:Ce3+,Gd3+.As the ratio of YAG:Ce3+,Gd3+ phosphor increased, the color rendering index of the LED improved significantly under the forward bias of 20mA. White LED with color rendering index of 85, CIE chromaticity coordinates of (0.3040, 0.2911), and color temperature Tc of 7615K was obtained as the ratio of YAG:Ce3+ and YAG:Ce3+,Gd3+ was 5:3.

Paper Details

Date Published: 28 October 2010
PDF: 6 pages
Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76583K (28 October 2010); doi: 10.1117/12.865938
Show Author Affiliations
Ke Li, China Jiliang Univ. (China)
Changyu Shen, China Jiliang Univ. (China)


Published in SPIE Proceedings Vol. 7658:
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology
Yadong Jiang; Bernard Kippelen; Junsheng Yu, Editor(s)

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