Abstract: The Y2O3∶Yb3+,Tm3+ nanopowders were prepared by chemical coprecipitation method, in which the Y2O3 was as the matrix, the Yb3+ was as the sensitizer and the Tm3+ was as the activator.The differential thermal analysis, infrared spectroscopy, X-ray diffraction, fluorescence, up-conversion luminescence and field emission scanning electron microscope were employed to characterize the nanopowders.The results show that the Tm3+ and Yb3+ can completely dissolve into the Y2O3 cubic lattice.The nanopowders exhibit uniform with the diameter of 50 nm.The fluorescence intensity and up-conversion luminescence intensity reach the maximum values at the calcination temperature of 900 ℃.The fluorescence intensity of green light (5F4/5S2→5I8) and red light (2F5/2→2F7/2) reaches maximum values at the Tm3+ concentration of 0.4;.The up-conversion luminescence intensity of blue light (1G4→3H6) and red light (1G4→3F4) reaches the maximum values at the Tm3+ concentration of 0.5;.

Key words: The Y2O3∶Yb3+,Tm3+ nanopowders were prepared by chemical coprecipitation method, in which the Y2O3 was as the matrix, the Yb3+ was as the sensitizer and the Tm3+ was as the activator.The differential thermal analysis, infrared spectroscopy, X-ray diffraction, fluorescence, up-conversion luminescence and field emission scanning electron microscope were employed to characterize the nanopowders.The results show that the Tm3+ and Yb3+ can completely dissolve into the Y2O3 cubic lattice.The nanopowders exhibit uniform with the diameter of 50 nm.The fluorescence intensity and up-conversion luminescence intensity reach the maximum values at the calcination temperature of 900 ℃.The fluorescence intensity of green light (5F4/5S2→5I8) and red light (2F5/2→2F7/2) reaches maximum values at the Tm3+ concentration of 0.4;.The up-conversion luminescence intensity of blue light (1G4→3H6) and red light (1G4→3F4) reaches the maximum values at the Tm3+ concentration of 0.5;.