Preparation and luminescence properties of Sr_7Zr(PO_4)_6:Dy~(3+) single-phase full-color phosphor

摘要

Novel single-phase white-light-emitting Sr_7Zr(PO_4)_6:Dy~(3+) phosphors for light-emitting diode (LED) applications were synthesized by conventional solid-state reactions. The phases and luminescent properties of the obtained Sr_7Zr(PO_4)_6:Dy~(3+) phosphors were characterized. The results show that the luminescence spectra excited by 350 nm consist of two characteristic blue and yellow bands, corresponding to the ~4F_(9/2) → ~6H_(15/2) and ~4F_(9/2) →~6H_(13/2) transitions of Dy~(3+), respectively. When x ＞ 0.02, the concentration quenching effect occurred, and the critical transfer distance (R_c) was ～ 19.247 A. The energy transfer of the Dy~(3+) ions is the electric dipole-dipole interaction mechanism. The International Commission on Illumination chromaticity coordinates for Sr_(7-x) Zr(PO_4)_6:xDy~(3+) phosphors were located in the white region. The developed phosphor has great potential as a single-component white-light-emitting phosphor for UV-LEDs.