Study of concentration dependence of luminescent properties for Eu3+ doped CaWO4 red phosphors
Eu3+掺杂CaWO4红色荧光粉发光性质的浓度依赖关系研究

Eu3+ doped CaWO4 phosphors of different concentrations are prepared by a co-precipitation method.The X-ray diffraction patterns and field emission scanning electron microscopy images are investigated.The excitation spectra,emission spectra and the curves of fluorescence decays of the samples are measured.The Judd-Ofelt（J-O） parameters,quantum efficiencies of the 5D0 level of Eu3+ and color coordinates are calculated.The dependences of relative intensity of charge transfer band,J-O parameter and quantum efficiency on doping concentration are discussed.The photoluminescence properties of Eu3+ doped CaWO4 luminescent material are studied.The results indicate that the 616 nm red emission of Eu3+→5D0→7F2 transition can be effectively excited by 394.5 nm and 465 nm with high excitation efficiency and the concentration quenching is high.So the CaWO4:Eu red phosphor may have a potential application for white light emitting diode.