Crystal Structure and Luminescent Properties of Tb3+, Ce3+ Co-doped NaSrPO4 Phosphors Prepared by Microwave Sintering

Abstract

A series of NaSr 1−x−y PO 4 :xTb 3+ :yCe 3+ (x = 0.04) phosphors doped with Ce 3+ at different concentrations were synthesized by microwave-assisted sintering. The crystal structure and luminescent properties of the phosphors were carefully investigated. X-ray diffraction (XRD) analysis confirmed that all the samples were matched with the standard patterns of NaSrPO 4 , even though the doping concentrations of Ce 3+ ions are increased to y = 0.07. All particles prepared by microwave-assisted sintering are very nearly spherical, except at the concentration of 0.07, at which they reveal a smooth and polygonal structure. The photoluminescence measurement shows that the major emission peak was located at 547 nm, approximating a green luminescence, which corresponds to a 5 D 4 -to-7 F 5 transition, and the optimal Ce 3+ concentration, which was 0.01, was observed. Moreover, the chromaticity (x, y) is changed with increasing Ce 3+ concentration.