Synthesis of Green-Emitting (La,Gd)OBr:Tb3+ Phosphors
نویسندگان
چکیده
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:Tb 3+ shifted to the shorter wavelength side with the increase in the crystal field around the Tb 3+ ions by doping Gd 3+ ions into the La 3+ site, and, as a result, the green emission intensity was successfully enhanced. The maximum emission intensity was obtained for (La0.95Gd0.05)OBr:5%Tb 3+ , where the relative emission intensity was 45% of that of a commercial green-emitting LaPO4:Ce 3+ ,Tb 3+ phosphor.
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