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• Kim, S
• Jyoko, K
• Masui, T
• Imanaka, N
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• Jyoko, K
• Masui, T
• Imanaka, N
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• Jyoko, K
• Masui, T
• Imanaka, N

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Materials 2010, 3(4), 2506-2515; doi:10.3390/ma3042506

Article

Synthesis of Green-Emitting (La,Gd)OBr:Tb³⁺ Phosphors

Sun Woog Kim, Kazuya Jyoko, Toshiyuki Masui and Nobuhito Imanaka*

Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

* Author to whom correspondence should be addressed.

Received: 29 December 2009; in revised form: 12 March 2010 / Accepted: 31 March 2010 / Published: 1 April 2010

(This article belongs to the Special Issue Luminescent Materials)

Download PDF Full-Text [347 KB, uploaded 1 April 2010 10:35 CEST]

Abstract: Green-emitting phosphors based on lanthanum-gadolinium oxybromide were synthesized in a single phase form by the conventional solid state reaction method, and photoluminescence properties of them were characterized. The excitation peak wavelength of (La_1-xGd_x)OBr:Tb³⁺ shifted to the shorter wavelength side with the increase in the crystal field around the Tb³⁺ ions by doping Gd³⁺ ions into the La³⁺ site, and, as a result, the green emission intensity was successfully enhanced. The maximum emission intensity was obtained for (La_0.95Gd_0.05)OBr:5%Tb³⁺, where the relative emission intensity was 45% of that of a commercial green-emitting LaPO₄:Ce³⁺,Tb³⁺ phosphor.

Keywords: green-emitting phosphor; rare earth oxybromide; crystal field modification; solid state reaction

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