Luminescence properties of Dy3+-doped Li2SrSiO4 for NUV-excited white LEDs

A series of single-phase full color phosphors, Dy3+-doped Li2SrSiO4 was synthesized by a solid-state reaction method. The phase of the as-prepared powders was measured by X-ray diffraction pattern (XRD) and the chemical composition was characterized using energy dispersive spectroscopy (EDS). The luminescent properties of Li2SrSiO4:Dy3+ were systematically investigated by concentration quenching, decay behavior and thermal stability measurements. The results suggested that the emission intensity of the Li2SrSiO4:Dy3+ was much stronger than that of Li2SrSiO4:Eu2+. It was worth to mention that Li2SrSiO4:Dy3+ phosphor possessed excellent thermal stability for use in light-emitting diodes (LEDs) and the emission intensity measured at 300 degrees C was only decreased 8% comparing with that measured at room temperature. Furthermore, the Commission International del'Eclairage (CIE) chromaticity coordinates of Li2SrSiO4:Dy3+ moved toward the ideal white light coordinates (0.33, 0.33). All results demonstrated that Li2SrSiO4:Dy3+ might be a potential phosphor for NUV-based white light-emitting diodes. (C) 2011 Elsevier B.V. All rights reserved.