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Synthesis of Green-Emitting (La,Gd)OBr:Tb3+ Phosphors
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
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 (La1-xGdx)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 (La0.95Gd0.05)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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Kim, S.W.; Jyoko, K.; Masui, T.; Imanaka, N. Synthesis of Green-Emitting (La,Gd)OBr:Tb3+ Phosphors. Materials 2010, 3, 2506-2515.
Kim SW, Jyoko K, Masui T, Imanaka N. Synthesis of Green-Emitting (La,Gd)OBr:Tb3+ Phosphors. Materials. 2010; 3(4):2506-2515.
Kim, Sun Woog; Jyoko, Kazuya; Masui, Toshiyuki; Imanaka, Nobuhito. 2010. "Synthesis of Green-Emitting (La,Gd)OBr:Tb3+ Phosphors." Materials 3, no. 4: 2506-2515.