Luminescence properties of SrB4O7:Sm2+ for light conversion agent

A deep red-emitting SrB4O7:Sm2+ phosphor for light conversion agent was synthesized by the conventional solid-state reaction. X-ray powder diffraction (XRD) analysis confirmed the phase formation of SrB4O7:Sm2+ materials. Results of luminescence properties showed that the phosphor could be efficiently excited by the UV-vis light region from 250–500 nm, and it exhibited deep red (685 nm) emission corresponding to 5D0→7F0 transition of Sm2+. The critical quenching concentration of Sm2+ in SrB4O7:Sm2+ phosphor was about 0.05, and the corresponding concentration quenching mechanism was verified to be the dipole-dipole interaction according to the Dexterʹs theory. The decay times had few alterations with different concentrations in SrB4O7:xSm2+ phosphor.