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Received April 28, 2011
Accepted August 1, 2011
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Visible up-conversion luminescence of CaWO4 : Er3+,Yb3+ and emission enhancement by tri-doping of Li+ ions
Department of Environmental Engineering, Chonnam National Univeristy, 77, Yongbong-ro, Gwangju 500-757, Korea 1Department of Materials Science and Engineering, Chungju National University, 50, Daehak-ro, Chungju-si, Chungbuk 380-702, Korea 2Department of Materials Science and Engineering, Hanyang University, 17, Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea
Korean Journal of Chemical Engineering, April 2012, 29(4), 519-524(6), 10.1007/s11814-011-0196-0
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Abstract
Er3+,Yb3+ co-doped CaWO4 polycrystalline powders were prepared by a solid-state reaction and their upconversion (UC) luminescence properties were investigated in detail. Under 980 nm laser excitation, CaWO4 : Er3+,Yb3+ powder exhibited green UC emission peaks at 530 and 550 nm, which were due to the transitions of Er3+ (2H11/2)→Er3+(4I15/2) and Er3+ (4S3/2)→Er3+ (4I15/2), respectively. Effects of Li+ tri-doping into CaWO4 : Er3+,Yb3+ were investigated. The introduction of Li+ ions reduced the optimum calcinations temperature about 100℃ by a liquid-phase sintering process and the UC emission intensity was remarkably enhanced by Li+ ions, which could be attributed to the lowering of the symmetry of the crystal field around Er3+ ions.
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References
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Shannon RD, Acta Cryst., A32, 751 (1976)
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Luo XX, Cao WH, Sci. China Ser., B-Chem., 50, 505 (2007)
Riseberg LA, Moos HW, Phys. Rev., 174, 429 (1968)
