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Issue
Korean Journal of Chemical Engineering,
Vol.29, No.4, 519-524, 2012
Visible up-conversion luminescence of CaWO4 : Er3+,Yb3+ and emission enhancement by tri-doping of Li+ ions
Kim DH, Ryu JH, Chung JH, Eun JW, Shim KB, Cho SY
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.
Keywords: UC (Up-conversion) Luminescence; CaWO4 : Er3+,Yb3+; Solid-state Reaction Method; Li+ Tri-doping
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[Cited By]
  1. Lee HL, ShiN SJ, Lee MS, Choe HS, Kim JH, Korean Chemical Engineering Research, 55(6), 731, 2017
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