Visible up-conversion luminescence of CaWO4: Er3+,Yb3+ and emission enhancement by tri-doping of Li+ ions

Autor: Jun Ho Chung, Jong Won Eun, Jeong Ho Ryu, Kwang Bo Shim, Sung-Yong Cho, Do-Hwan Kim
Rok vydání: 2011
Předmět:
Zdroj: Korean Journal of Chemical Engineering. 29:519-524
ISSN: 1975-7220
0256-1115
DOI: 10.1007/s11814-011-0196-0
Popis: Er3+,Yb3+ co-doped CaWO4 polycrystalline powders were prepared by a solid-state reaction and their up-conversion (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 °C 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.
Databáze: OpenAIRE
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