Preparation and Luminescence Properties of Dy~(3+) Doped Sr_3Lu(PO_4)_3 as a New Single Phase White Light Emitting Phosphor

摘要

The novel white light emitting phosphors Sr_3Lu_(1-x)Dy_x(PO_4)_3 (x = 0,02, 0,04, 0,06, 0.08 0.10) were synthesized via a conventional high-temperature solid-state reaction method at 1250°C The excitation spectrum indicated that these phosphors had a strong absorption in near UV region in the range from 260To 460 nm. And under 350 nm excitation, the blue emission at 483::;.--(~4F_(9/2)→~6H_((15)/2) and yellow emission at 576 nm (~4F_(9/2)→~6H_((13)/2) were observed in the phospir respectively. We studied the effect of different doping concentrations of Dy~(3+) activator on the luminescence properties and found that the optimum doping concentration is 6 mol%. According to the Dexter's theory, this quenching behavior is ascribed to be electric d-d interaction, Furthermore. the chromaticity coordinate (x = 0.28, y = 0.32) of Sr_3Lu(PO_4)_3:0.06Dy~(3+) phosphor was very close to the "ideal white" (x = 0.33, y = 0.33) in the chromaticity diagram. Our results indicate that the Sr_3Lu(PO_4)_3:Dy~(3+) phosphor can serve as a promising candidate for single-component white light emitting phosphor under near UV excitation.