Synthesis of green-emitting (Gd,La, Tb)2O(WO4)2 phosphors |
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| Affiliation: | 1. Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan;2. Japan Society for the Promotion of Science, 1-8 Chiyoda-ku, Tokyo 102-8472, Japan;1. Department of Gynecologic Oncology, IRCCS National Cancer Institute, Milan, Italy;2. Department of Surgery, IRCCS National Cancer Institute, Milan, Italy;1. Department of Chemical Engineering, National Tsing Hua University, 101, Section 2, Kuang-Fu Road, Hsin-Chu 30013 Taiwan;2. Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan |
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| Abstract: | Green-emitting (Gd1?x?yLaxTby)2O(WO4)2 (0 ? x ? 0.05, 0.05 ? y ? 0.15) phosphors were synthesized in a single phase form by the conventional solid-state reaction method, and their photoluminescent properties were characterized. The (Gd1?x?yLaxTby)2O(WO4)2 phosphors showed strong and broad excitation bands from 230 to 350 nm, corresponding to the energy transition from the 4f8 to 4f75d configuration of Tb3+ and the charge-transfer (CT) transition of O2??W6+. The oxytungstate phosphors exhibited typical emission peaks assigned to the transition from 5D4 to 7FJ (J = 6, 5, 4, and 3) of Tb3+, and the luminescence emission intensity was effectively enhanced by the La3+ doping into the host Gd2O(WO4)2 lattice. The highest green emission intensity was obtained for (Gd0.87La0.03Tb0.10)2O(WO4)2, where the relative emission intensity was 63% that of a commercial green-emitting (La0.52Ce0.31Tb0.17)PO4 phosphor. |
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| Keywords: | Green-emitting phosphor Gadolinium oxytungstate Solid-state reaction method |
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