Photoluminescence spectra of thenardite Na2SO4 activated with rare-earth ions, Ce, Sm, Tb, Dy and Tm |
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Authors: | Aierken Sidike Jui-Yang He K Atobe |
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Institution: | a School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi, 830054 Xinjiang, China b Graduate School of Natural Science and Technology, Okayama University, Tsushima-naka, Kita-ku, 700-8530 Okayama, Japan c Graduate School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi, 830054 Xinjiang, China d School of Life Science and Chemistry, Xinjiang Normal University, Urumqi, 830054 Xinjiang, China e Department of Physics, Faculty of Education, Okayama University, Tsushima-naka, Kita-ku, 700-8530 Okayama, Japan |
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Abstract: | Five Na2SO4:RE3+ phosphors activated with rare-earth (RE) ions (RE3+=Ce3+, Sm3+, Tb3+, Dy3+ and Tm3+) were synthesized by heating natural thenardite Na2SO4 from Ai-Ding Salt Lake, Xinjiang, China with small amounts of rare-earth fluorides, CeF3, SmF3, TbF3, DyF3 and TmF3, at 920 °C in air. The photoluminescence (PL) and optical excitation spectra of the obtained phosphors were measured at 300 and 10 K. In the PL spectrum of Na2SO4:Ce3+ at 300 K, two overlapping bands with peaks at 335 and 356 nm due to Ce3+ were first observed. Narrow bands observed in PL and excitation spectra of Na2SO4:RE3+ (RE3+=Sm3+, Tb3+, Dy3+ and Tm3+) phosphors were well identified with the electronic transitions within the 4fn (n=5, 8, 9 and 12) configurations of RE3+. The existence of excitation bands with high luminescence efficiency at wavelengths shorter than 230 nm is characteristic of Na2SO4:RE3+ (RE3+=Sm3+, Tb3+, Dy3+ and Tm3+) phosphors. The obtained results suggest that these phosphors are unfavorable as the phosphor for usual fluorescence tubes, i.e., mercury discharge tubes, but may be favorable as the phosphor for UV-LED fluorescent tubes and as cathodoluminescence, X-ray luminescence and thermoluminescence phosphors. |
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Keywords: | Photoluminescence Thenardite Na2SO4 Rare-earth ions |
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