Photoluminescence properties of thenardite from Ai-Ding Salt Lake,Xinjiang, China |
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| Authors: | Aierken Sidike Keyoumu Niyazi Heng-Jiang Zhu K Atobe N Yamashita |
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| Institution: | (1) School of Mathematics, Physics and Information Sciences, Xinjiang Normal University, 830054 Urumqi, Xinjiang, China;(2) Xingjiang Geology and Mineral Museum, North Friendship Street, 830000 Urumqi, Xinjiang, China;(3) Department of Physics, Faculty of Education, Okayama University, Tsushima-naka, Okayama 700-8530, Japan |
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| Abstract: | The photoluminescence (PL) spectra, excitation spectra, and PL decay curves of natural, heat-treated, and γ-ray-irradiated
thenardites from Ai-Ding Salt Lake, Xinjiang, China, were studied. The natural thenardite under 300 nm excitation showed milk-white
luminescence, and the PL spectrum consisted of an extremely broad band with a peak located at approximately 509 nm, spreading
over a wide range of UV and visible wavelengths. The excitation spectra, obtained by monitoring the luminescence at 530 nm,
consisted of a broad band with a peak located at approximately 235 nm and a flat band spreading over a wide range of UV and
visible wavelengths. The PL decay curve of natural thenardite consisted of a fast-decay component with a lifetime of less
than 0.1 μs and a slow-decay component with a half-decay time of approximately 0.4 s. The heat treatment of thenardite at
900°C for 20 min reduced the luminescence efficiency to 1/100. The γ-ray irradiation of thenardite reduced the luminescence
efficiency to approximately half. |
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| Keywords: | Thenardite Na2SO4 Photoluminescence Ai-Ding Salt Lake |
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