Li doping effects on the upconversion luminescence of Yb3+/Er3+-doped ABO4 (A = Ca,Sr; B = W,Mo) phosphors |
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| Affiliation: | 1. Department of Physics, Dongeui University, Busan 614-714, Republic of Korea;2. Department of Physics, Pukyong National University, Busan 608-737, Republic of Korea;1. Lashkarev Institute of Semiconductor Physics of NAS of Ukraine, 41 Pr. Nauki, 03028 Kyiv, Ukraine;2. Institute for Single Crystals of NAS of Ukraine, 61001, Lenina Ave. 60, Kharkiv, Ukraine;3. Institute for Scintillation Materials of NAS of Ukraine, 61001, Lenina Ave. 60, Kharkiv, Ukraine;4. SSI “Institute for Single Crystals” of NAS of Ukraine, 61001, Lenina Ave. 60, Kharkiv, Ukraine;1. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), College of Chemistry and Pharmacy, Guangxi Normal University, Guilin 541001, China;2. Center for Clean Energy Engineering, University of Connecticut, 44 Weaver Rd. Storrs, CT 06269-5233, United States;1. Institute for Nuclear Research, MSP 03680 Kyiv, Ukraine;2. Centre de Sciences Nucléaires et de Sciences de la Matière, 91405 Orsay, France;3. Kyiv National Taras Shevchenko University, MSP 03680 Kyiv, Ukraine;4. Dipartimento di Scienza e Alta Tecnologia dell’Università dell’Insubria, I-22100 Como, Italy;5. INFN, Sezione di Milano-Bicocca, I-20126 Milano, Italy;6. Nikolaev Institute of Inorganic Chemistry, 630090 Novosibirsk, Russia;7. Department of Physics, University of Oxford, Oxford OX1 3RH, UK;8. Diamond Light Source, Didcot OX11 0DE, UK;9. INFN, Sezione di Roma “La Sapienza”, I-00185 Rome, Italy;10. CNRS, Université de Bordeaux, ICMCB, 33608 Pessac cedex, France;11. CML Ltd., 630090 Novosibirsk, Russia;1. School of Science, Chongqing University of Post and Telecommunications, Chongqing 400065, China;2. Department of Physics, University of Science and Technology of China, Hefei 230026, China;3. Department of Physics, Zhejiang Normal University, Jinhua 321004, China |
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| Abstract: | ABO4 (A = Ca, Sr; B = W, Mo):Er3+/Yb3+/Li+ phosphors tri-doped with different concentrations of Li+ ion ranging from 0 to 22.5 mol% were prepared by using a solid-state reaction method. And their upconversion (UC) luminescence properties were in estimated under a 975 nm laser-diode excitation. The four kinds of phosphors (CaWO4, CaMoO4, SrWO4, and SrMoO4) tri-doped with Er3+, Yb3+ and Li+ ions showed strong green UC emission peaks at 530 nm and 550 nm and weak red UC emission. The intensity of green UC emission of Li+ doped samples was several higher than that of Li+ un-doped samples due to the reduction of lattice constant and the local crystal field distortion around rare-earth ions. The optimum doping concentration of Li+ ions was investigated and the effects of Li+ concentration for UC emission intensity were studied in detail. |
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| Keywords: | Phosphors Upconversion luminescence |
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