White light LED based on YAG:Ce3+ and YAG:Ce3+,Gd3+ phosphor

Ke Li; Changyu Shen

doi:10.1117/12.865938

28 October 2010 White light LED based on YAG:Ce³⁺ and YAG:Ce³⁺,Gd³⁺ phosphor

Ke Li, Changyu Shen

Proceedings Volume 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology; 76583K (2010) https://doi.org/10.1117/12.865938
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

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.

Citation Download Citation

Ke Li and Changyu Shen "White light LED based on YAG:Ce³⁺ and YAG:Ce³⁺,Gd³⁺ phosphor", 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); https://doi.org/10.1117/12.865938

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KEYWORDS

Light emitting diodes

Gadolinium

YAG lasers

Crystals

Blue light emitting diodes

Cerium

Gallium nitride

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