Abstract
Yb3+/Er3+ codoped BaGd2(MoO4)4 phosphor powders were prepared by the Sol–gel method and the upconversion luminescence properties were investigated in detail. Under 980nm semiconductor laser excitation, BaGd2(MoO4)4:Yb3+,Er3+ phosphor exhibits green upconversion luminescence with peaks at 530 and 550nm, which are due to the transitions of Er3+ (2H11/2)→Er3+ (4I15/2) and Er3+ (4S3/2)→Er3+ (4I15/2), respectively. Both of the two green emission lines are produced by populating Er3+ ions to the excited state through a two-photon process. By monitoring the intensities of the green upconversion luminescence, the optimum conditions for the Sol–gel synthesis were determined when the molar ratio of citric acid to total chelate metal cations was 2:1 and the sintering temperature was at 1073K. The concentration quenching effect for Er3+ was found at the optimum doping concentration of 6mol%, and the critical distance for the neighboring Er3+ was determined to be about 21.5Å.
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