Effect of Tm3+ Concentration and Temperature on Blue and NIR Upconversion Luminescence in Tm3+/Yb3+ Co-Doped NaY(WO4)2 Microstructures
Tm3+/Yb3+ codoped NaY(WO4)2 microstructures with various Tm3+ concentrations and 10 mol% Yb3+ concentration were prepared by a microwave-assisted hydrothermal method, and their upconversion luminescence (UCL) was investigated. Under excitation at 980 nm, Tm3+/Yb3+ codoped NaY(WO4)2 exhibited strong blue and near infrared (NIR) emissions, respectively, corresponding to 1G4 → 3H6 and 3H4 → 3H6 transitions, with weak red emission due to the 1G4 → 3H4 transition. The optimum doping concentrations of Tm3+ for the highest blue and NIR UCL were investigated, and it was found that the optimal concentrations for blue and NIR emissions were 0.5 mol% and 1.5 mol%, respectively. In addition, an analysis of temperature dependent blue and NIR UCL in both the samples with low and high Tm3+ concentrations, respectively, was undertaken. The results implied that the sample with low Tm3+ concentration displayed more obvious effect on the thermal quenching of 1G4 level.
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Document Type: Research Article
Publication date: January 1, 2016
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