Synthesis and luminescent properties of GdSrAl_3O_7:Tb~(3+) phosphor under VUV/UV excitation

摘要

Superfine powder of Tb~(3+) ion-doped aluminates phosphors, GdSrAl_3O_7:Tb~(3+) was synthesized with a precursor prepared by an EDTA-sol-gel method at 900 °C. Field-emission scanning electron-microscopy (FE-SEM) observation indicated a narrow size-distribution of about 150-300 nm for the particles with elliptical shape. Upon excitation with vacuum ultraviolet (VUV) and near UV light excitation, the phosphors show a strong emission line at around 542 nm corresponding to the ~5D_4 -> ~7F_5 transition of Tb~(3+), and the highest PL intensity at 542 nm was found at a content of about 12 mol percent Tb~(3+). As the Tb~(3+) concentration increases, Tb ions strongly cross-relaxation interact resulting in a decrease of the lifetime. The results reveal that GdSrAl_3O_7:Tb~(3+) would be a promising green phosphor for PDP application.