LUMINESCENCE OF CARNET-TYPE Cd_3Al_2Ge_3O_(12):Tb COMPOUND
Liu Xing-ren, Ma Long, Jiang Jun, Shen Wu-fu(Changchun Institute of Physies, Academia Sinica)
Trivalent terbium activated garnet-type cadium aluminium germanate Cd3Al2Ge3O12 :Tb phosphor have been synthesized. The diffused reflecion spectra,excitation spectra and emission spectra for the host lattice and Tb3+-activated phosphor were measured at room temperature. It is observed that the undoped host lattice and Cd3Al2Ge3O12 :Tb phosphor exhibit both bright and long phosphorescence after UV-excited light is turned off. Phosphorescence of the host lattice shows blue light, but that of Tb3+-activated phosphor shows the characteristic green-yellow emission of Tb3+ ion. The decay of both phosphorescences agree with B=At-a. The phosphorescence phenomenon is the result of energy transfer from the host lattice to Tb3+ ion.