Photoluminescence properties and energy transfer of Sr_2Al_2SiO_7 phosphor doped with Eu~(2+) and Ce~(3+)

The phosphors of Sr2Al2SiO7∶Re(Re=Eu2+,Ce3+) were synthesized by high temperature solid state reaction.The luminescence properties of Eu2+,Ce3+ and the energy transfer between them were studied.The results indicate that Sr2Al2SiO7∶Eu2+ phosphors show a broad excitation band and the main emission peak of the sample is located at 513nm.The emission intensity reaches the maximum value when the concentration of Eu2+ is 5mol%.The excitation spectrum is composed of two peaks which locate at 300 and 337nm,respectively.The strongest emission peak locates at 406nm and the strongest emission intensity is obtained when the concentration of Ce3+ is 2mol%.Besides,co-doping of Ce3+ and Eu2+ enhances the emission intensity by transferring Ce3+ emission energy to Eu2+,which contributes to photoluminescence performance.