2006 年 33 巻 4 号 p. 191-
Single crystals with nominal composition of (Pr_x, Lu_<1-x>)_3(Ga_y, Al_<1-y>)_5O_<12> (Pr:LuGAG) were grown by the micro-pulling-down (μ-PD) method with RF heating system and their luminescent properties were characterized. Compostions of the crystals were analyzed by electron probe micro analysis (EPMA) measurements. Optical characterization such as photoluminescence spectra, radioluminescence spectra, light yield measurements and decay kinetics were studied. Lattice constants and densities of each crystal were determined. Lattice constants and densities were systematically increased with the amount of Ga concentration. Luminescent properties of Pr:LuGAG were characterized by photoluminescence spectra and decays, radioluminescence spectra and light yield measurements. 5d-4f luminescence was observed for 0≤y≤0.6 samples. It was found that 5d -4f emission of Pr^<3+> is quenched only slightly up to y≤0.4 while density is increased systematically in the range of 0≤y≤1.0.