A New Blue-Emitting Phosphor of Ce~(3+)-Activated Fluorosilicate Apatite Ba_2Y_3[SiO_4]_3F

摘要

Blue-emitting phosphor of Ce~(3+) -activated fluorosilicate apatite Ba_2Y_3[SiO_4]_3F was prepared via conventional solid-state reaction method. The X-ray powder diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) excitation and emission spectra, and the decay curves (lifetimes) were applied to characterize the phosphors. The effects of Ce~(3+) activator concentration on the luminescence properties were investigated. Ba_2Y_(2.85)Ce_(0.15)[SiO_4]_3F exhibits the brightest blue emission with CIE coordinates of (x = 0.231, y = 0.301). The crystallographic site of Ce~(3+) ions in Ba_2Y_3[SiO_4]_3F lattices was identified. Two kinds of crystallographic Ce~(3+) occupying MI and MII sites in Ba_2Y_3[SiO_4]_3F lattices result in two distinct emission centers. The internal PL quantum efficiency, the temperature-dependent luminescence, and the activation energy of thermal quenching were investigated to evaluate the potential application. This is a new kind of blue-emitting phosphor based on apatite structure.