Synthesis and luminescence enhancement of Li3Ba2Gd2.95−yEu0.05My(MoO4)8 (M=Bi3+, Sm3+) phosphors based on energy transfer

Bi3+ and Sm3+ co-doped with Li3Ba2Gd2.95−yEu0.05(MoO4)8 red phosphors were synthesized by a solid-state reaction. The phosphors were characterized by X-ray powder diffraction, field-emission scanning electron microscopy, and photoluminescence spectroscopy analyses. The 5D0→7F2 transition of Eu3+ that led to the red emission of the phosphors was predominantly observed in the photoluminescence spectra. The enhanced emission intensity at 616 nm demonstrated efficient energy transfer from Bi3+ or Sm3+ ions to Eu3+ ions. The high color purities of Li3Ba2Gd2.92Eu0.05Bi0.03(MoO4)8 and Li3Ba2Gd2.945Eu0.05Sm0.005(MoO4)8 phosphors were calculated at 94.8% and 95.1%, respectively. Results indicated that Li3Ba2Gd2.92Eu0.05Bi0.03(MoO4)8 and Li3Ba2Gd2.945Eu0.05Sm0.005(MoO4)8 red phosphors can be used for white light-emitting diodes.