Abstract
(Y0.87La0.1Zr0.03)2O3 nanopowders doped with various concentrations of Tm3+ and Ho3+ were prepared by the citrate method. The standard cubic Y2O3 phase can be matched in the Tm3+/Ho3+ co-doped (Y0.87La0.1Zr0.03)2O3 nanopowders. The nanopowders exhibit average particle sizes of 40, 60, 80 and 100 nm after calcinated at 900, 1000, 1100 and 1200 °C, respectively. The energy transfer from Tm3+ to Ho3+ and the optimum fluorescence emission around 2 μm were investigated. Results indicate that the emission bands at around 1.86 and 1.95 μm correspond to 3F4→3H6 transition of Tm3+ and 5I7→5I8 transition of Ho3+, respectively. Better spectral properties were achieved in Tm3+/Ho3+ co-doped (Y0.87La0.1Zr0.03)2O3 nanopowders with the average size of 100 nm obtained at the conditions of the treatment of precursors calcinated at 1200 °C for 2 h doped with 1.5 mol% Tm3+ and 1 mol% Ho3+.
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