Preparation and photoluminescence properties of Dy3＋-doped Ba3Lu（PO4）3 phosphors

Ba3Lu（PO4）3：Dy3＋ phosphors were successfully synthesized by conventional solid state reaction and its photoluminescence properties were investigated by X-ray diffraction （XRD）, photoluminescence spectra and diffuse reflectance spectra, respectively. Results showed that the phosphor could be excited by the ultraviolet visible light in the region from 320 to 460 nm, and it showed two dominant emission bands peaking at 484 nm （blue light） and 575 nm （yellow light） which originated from the transitions of 4F9/2--6H15/2 and 4F9/2---6rH13/2 of Dy3＋, respectively. According to Dexter＇s theory, the concentration quenching mechanism occurred via the electric dipole-dipole interaction. The lifetime values of Dy3＋ ions at different concentrations （x-0.01, 0.03, 0.05, 0.08 and 0.10） were determined to be about 0.8556, 0.7595, 0.6864, 0.6059 and 0.5456 ms.