Eu3+ activated CaWO4 was prepared by high temperature solid state reaction technique. Red afterglow was observed for in the CaWO4∶Eu after exciting with 254 nm light due to Eu3+ transition from 5D0 to 7FJ (J=0, 1, 2, 3,4). By the cal culation of the thermoluminescence spectrum of CaWO4∶Eu, we conclude that there were two types of trap centers: VCa″ was formed by substitution of Ca2+ by Eu3 + and complex traps were produced because of substitution of W6+ by Eu3+.
Nano-titania was prepared by microwave heating hydrolysis.And the effects of microwave heating hydrolysis on the TiO2 size,morphology and crystal phase were studied by means of orthogonal experiment,XRD,TEM and IR.The transforming temperature from anatase to rutile of titania prepared by microwave heating hydrolysis was above 800℃.
Nano-sphere-like Eu3+ activated lanthanum oxysulfide phosphor was first synthesized directly by solvothermal method. The phosphor was characterized by XRD, TEM and PL. Photoluminescence spectra indicate that this phosphor showed three typical transitions of Eu3+（（）5D0→（）7F1, （）5D0→（）7F2, （（）5D0→（）7F4）.） In comparison with those prepared by high temperature solid state method, photoluminescence spectrum of Eu3+（（）5D0→（）7F2）-doped nano-La2O2S∶Eu3+ phosphor became broader. And the reaction mechanism was also mentioned in this paper.
