Tunable luminescence and energy transfer properties in YVO 4 :Bi 3+ ,E u 3+ phosphors

In this paper, YVO4:Bi 3? ,E u 3? phosphors have been synthesized by high-temperature solid-state method. The samples were characterized by X-ray powder diffraction, photoluminescence spectra, luminescence lifetime, and GSAS structure refinement. The excitation spectrum of YVO4:Bi 3? ,E u 3? monitoring at 622 nm was a broad band with major peak located at 280 nm. It contained the charge transfer from 2p orbit of O 2- to 4f orbit of Eu 3? (257 nm) and the absorbing from energy level transition of Bi 3? ( 1 S0? 3 P1, 346 nm) and VO4 3( l A1? 1 T2, 286 nm and l A1? 1 T1, 320 nm) through gauss fitting. Upon excitation at a wavelength of 280 nm, the major emission peak of YVO4:Bi 3? ,E u 3? located at 622 nm (red) was attributed to the electric dipole transition 5 D0? 7 F2 of Eu 3? . The energy transfer mechanism of Bi 3? ?Eu 3? was also studied to be dipole‐ quadrupole mechanism of electric multipole interaction, and the critical distance between Eu 3? and Bi 3? was calculated by concentration quenching method. The emission color of YVO4:Bi 3? ,E u 3? can be tuned by the energy transfer of ions and the concentration of activator. In a word, the material has a good application prospects in the field of light-emitting diode under ultraviolet excitation.