화학공학소재연구정보센터
Journal of Materials Science, Vol.52, No.2, 782-792, 2017
Tunable luminescence and energy transfer properties in YVO4:Bi3+, Eu3+ phosphors
In this paper, YVO4:Bi3+, Eu3+ 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:Bi3+, Eu3+ monitoring at 622 nm was a broad band with major peak located at 280 nm. It contained the charge transfer from 2p orbit of O2- to 4f orbit of Eu3+ (257 nm) and the absorbing from energy level transition of Bi3+ (S-1(0)-> P-3(1), 346 nm) and VO4 (3-) ((l)A(1)-> T-1(2), 286 nm and (l)A(1)-> T-1(1), 320 nm) through gauss fitting. Upon excitation at a wavelength of 280 nm, the major emission peak of YVO4:Bi3+, Eu3+ located at 622 nm (red) was attributed to the electric dipole transition D-5(0)-> F-7(2) of Eu3+. The energy transfer mechanism of Bi3+-> Eu3+ was also studied to be dipole-quadrupole mechanism of electric multipole interaction, and the critical distance between Eu3+ and Bi3+ was calculated by concentration quenching method. The emission color of YVO4:Bi3+, Eu3+ 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.