Synthesis and luminescence properties of novel LiSrPO4:Dy3+ phosphor

Novel LiSrPO4:Dy3+ phosphors for white light-emitting diodes (w-LEDs) were synthesized by the conventional solid-state reaction. X-ray powder diffraction (XRD) analysis confirmed the phase formation of LiSrPO4:Dy3+ materials. Luminescence properties results showed that the phosphor could be efficiently excited by the UV–vis light region from 250 to 460 nm, and it exhibited blue (483 nm) and yellow (574 nm) emission corresponding to 4F9/2 → 6H15/2 transitions and 4F9/2 → 6H13/2 transitions, respectively. The luminescence intensity of LiSrPO4:xDy3+ phosphor firstly increased and then decreased with increasing Dy3+ concentration, and reached the maximum at x = 0.03. It was found that concentration quenching occurred as a result of dipole-dipole interaction according to the Dexterʹs theory. The decay time was also determined for various concentrations of Dy3+ in LiSrPO4.