Photoluminescence Properties of Na+(Ba2+) and Nb5+(P5+)-Doped Sr2.4Y0.2Eu0.2V2O8 Phosphors

摘要

A series of Sr2.4Y0.2Eu0.2V2O8:xNa(+)(yBa(2+)) and Sr2.4Y0.2Eu0.2V2O8:zNb(5+)(mP(5+)) phosphors are synthesized by solid-state reaction method and the photoluminescence (PL) properties are investigated. All phosphors exhibit bright red emission centered at similar to 619 nm. Na+ and Ba2+, as the sensitizers for the luminescence of Eu3+, are found to improve significantly the PL intensity of these phosphors. For the Sr2.4Y0.2Eu0.2V2O8:xNa(+)(yBa(2+)) samples, the emission intensity increases with Na+(Ba2+) doping, and the strongest intensity is achieved in the case when x is 0.09 and y is 0.15. The introduction of Nb(P)O-4 (3-) reduces the non-radiative energy transfer between neighboring VO4 (3-) and results in the energy transfer between VO4 (3-) and Eu3+, and eventually leads to the enhancement of Eu3+ emission. Comparing the doping effect of between Na and Ba, and the effect between Nb and P, respectively, it is found that both Na and P doping largely tend to improve the emission intensity. The relevant mechanisms have been discussed.