Synthesis-dependent luminescence properties of Y_3Al_5O_(12):Re~(3+) (Re=Ce, Sm, Tb) phosphors

摘要

By using metal nitrates and oxides as the starting materials, Y_3Al_5O_(12) (YAG) and YAG:Re~(3+) (Re = Ce, Sm, Tb) powder phosphors were prepared by solid-state (SS), coprecipitation (CP) and citrate gel (CG) methods. The resulting YAG and YAG-based phosphors were characterized by XRD, FT-IR, SEM and photoluminescent excitation and emission spectra. The purified crystalline phases of YAG were obtained at 800℃ (CG) and 900℃ (CP, SS). At an identical annealing temperature and doping concentration, the doped rare-earth ions showed the stronger emission intensity in the CP- and SS-derived phosphors than the CG-derived YAG phosphors. The poor emission intensity for the CG-derived phosphors is mainly caused by the contamination of carbon impurities from citric acid in the starting materials.