Preparation,Tructure And Luminescence Properties Research Of Cerium Oxide Based Upconversion Materials

In this article erbium, holmium, thulium single doped and co-doped with ytterbium samples were prepared by coprecipitation method. Phase structure and upconversion luminescence under the excitation of 980 nm infared light of each system are mainly studied. We further discuss proper upconversion mechanism according to upconversion luminescence phenomenon. The results of research are listed as follows:(1) CeO2:RE3+ and CeO2:RE3+/Yb3+(RE3+=Er3+、 Ho3+、 Tm3+) samples calcinated at different temperatures in 400~1200 ℃ has single phase which is cubic cerium oxide solid solution codoped with rare earth ions. The synthesis temperature effects the performance of the sample, high synthesis temperature is beneficial to the improvement of upconversion luminescence performance. For samples the better synthetic conditions are calcinating for 3 h at 1200 ℃.(2) CeO2:Er3+ with lower and higher Er3+ doping concentration mainly have green and red light emission under 980 nm laser excitation, which are mainly caused by the excited state absorption and cross relaxation respectively; CeO2:Er3+/Yb3+ samples mainly have red light emission caused by cross relaxation. Upconversion luminescence of single doped samples CeO2:Ho3+ and CeO2:Tm3+ are weak, rarely seen and very strong near-infared light mainly caused by cross relaxation excits in CeO2:Ho3+/Yb3+ samples except strong green and weak red light; CeO2: Tm3+/Yb3+ system mainly include blue, green, red and infrared emission. Overall, cerium oxide based upconversion luminescence materials is one of the best materials in oxide based upconversion luminescence materials on luminescence performance, and has a broad application prospect.