Phosphor of KMgF_3:Ce^(3+)is synthesized through solvothermal method at 180℃and characterized by means of X-ray powder diffraction(XRD)and environment scanning electron microscopy(ESEM).X-ray photoelectron spectroscopy(XPS)is applied to the study of the energy band structure of KMgF_3:Ce^(3+)and confirms the oxygen content of the product is very low.The fluorescence spectra of the rare-earth ion-doped KMgF_3 is investigated by the fluorescence spectrophotometer.In the emission spectra,there is a broadband emission with a maximum center located at 306 nm arising from d-f transition of Ce^(3+)in the host.This will be useful for ultraviolet tunable lasers.
Guo Xian ZhuYong Da LiHong Zhou LianJing Hui YanXing Quan Wang
Europium(Ⅲ)-doped YF_(3) is prepared by a hydrothermal process at 200℃.X-ray diffraction(XRD) pattern identifies the formation of YF_(3) phase without detectable impurity.Environment scanning electron microscopy(ESEM) image shows the even size distribution of the samples with cubic morphology.The excitation and emission spectra of the rare earth ions doped YF_(3) are investigated by fluorescence spectrophotometer.The excitation spectrum for 591 nm emission has several excitation bands at 320, 365,386,397 and 467 nm,and the main peak value was 397 nm.Typical Eu^(3+) emission peaks at 591 nm (^(5)D_(0)→^(7)F_(1)) and 612 nm (^(5)D_(0)→^(7)F_(2)) are observed when excited by 397 nm,and the strongest emission is 591 nm,demonstrating that the rare earth ions occupy the centrosymmetrical sites in YF_(3).
Guo Xian ZhuYong Da LiHong Zhou LianYi Zhao ChenSheng Gui Liu
