Upconversion Luminescence Property of Nanocrystalline Y2O3:Pr3+,Yb 3+

Abstract

The upconversion luminescence nanocrystalline powders Y2O3:Pr3+,Yb3+were prepared by co-precipitation method and characterized by X－ray diffraction,fluorescence spectrum and so on. Its luminescence property and the effect of different calcining temperatures and rare-earth ion doped concentration on its luminescence property were discussed. The results show that the nanocrystalline powders calcined at 800-1200 °C for 2h has a single crystalline phase -the solid solution cubic system phase of Y2O3. There is a upconversion luminescence phenomenon in the powders doped 1%(mol percent) Pr3+. The powders excited by a 980 nm laser diode emit weak green fluorescent observed by naked eye. The upconversion luminescence of Pr3+in Y2O3:Pr3+,Yb3+is obviously different that of Pr3+in other materials.There are two stronger emission zone in upconversion emission spectra of the powders in the 400nm-800nm range,whose center wavelength value are respectively 551nm, 762nm.Increasing the calcining temperature of the samples from 1000°C to 1200°C, the emission peak intensity sharply elevates.