Synthesis, energy transfer and luminescence properties of KSrVO^sub 4^:Eu^sup 3+^ red phosphor

KSrVO4:Eu3+ phosphors are synthesized by solid-state reaction method in air. Host KSrVO4 under excitation at 345 nm emits green-yellow light with the CIE chromaticity coordinates (0.3466, 0.4425), and its broad emission band peaking at ~545 nm covers the range 400-750 nm due to 3T1,2 [arrow right] 1A1 transitions in [VO4]3- group. KSrVO4:Eu3+ phosphor under excitation at 315 and 394 nm shows red emission with the CIE chromaticity coordinates (0.6279, 0.3717), and the emission spectra in the range of 560-750 nm contains four narrow emission bands owing to 5D0 [arrow right] 7FJ (J = 1, 2, 3, and 4) transitions of Eu3+ ion, respectively. The optimal Eu3+ doping concentration is ~4 mol%. The lifetime decreases from 0.991 to 0.893 ms with increasing Eu3+ concentration within the range 0.5-6 mol%. The possible luminous mechanism is analyzed by the simplified energy level diagrams of VO4 3- group and Eu3+ ion, and energy transfer process in KSrVO4:Eu3+ phosphor. The experimental results indicate that KSrVO4:Eu3+ phosphor will be possible to be used as red phosphor candidate for white light-emitting diode (LED) based on ultraviolet (~315 nm) and near ultraviolet (~395 nm) LED chips.