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 F-4(9/2) -> H-6(15/2) transitions and F-4(9/2) -> H-6(13/2) transitions, respectively. The luminescence intensity of LiSrPO4:xDy(3+) 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 Dexter's theory. The decay time was also determined for various concentrations of Dy3+ in LiSrPO4. (C) 2011 Elsevier Ltd. All rights reserved.