Synthesis of Green-Emitting (La,Gd)OBr:Tb3+ Phosphors |
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| Authors: | Sun Woog Kim Kazuya Jyoko Toshiyuki Masui Nobuhito Imanaka |
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| Institution: | Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; E-Mails: (S.W.K.); (K.J.); (T.M.) |
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| 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. |
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| Keywords: | green-emitting phosphor rare earth oxybromide crystal field modification solid state reaction |
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