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Mi-YangKim,Se-JongBaik,김화택,Moon-SeogJin,Hyung-GonKim,Sung-HyuChoe,Chang-SunYoon 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.1
Undoped and $\rm Co^{2+}-$, $\rm Ho^{3+}-$, $\rm Er^{3+}-$, and $\rm Tm^{3+}-$doped $\rm CaGa_{2}S_{4}$, $\rm CaGa_{2}Se_{4}$, $\rm CaIn_{2}S_{4}$, and $\rm CaIn_{2}Se_{4}$ single crystals were grown by using the chemical transport reaction method. The temperature dependence of the optical energy gap was well fitted by the Varshni equation. In the $\rm Co^{2+}-$doped $\rm CaGa_{2}S_{4}$, $\rm CaGa_{2}Se_{4}$, $\rm CaIn_{2}S_{4}$, and $\rm CaIn_{2}Se_{4}$ single crystals, two groups of impurity optical absorption peaks due to $\rm Co^{2+}$ sited in a $\rm T_{d}$ symmetry were observed in the wavelength regions of 600 $\sim$ 900 nm and 1350 $\sim$ 1950 nm at 11 K. In the photoluminescence spectra of the $\rm Ho^{3+}-$, $\rm Er^{3+}-$, and $\rm Tm^{3+}-$doped $\rm CaGa_{2}S_{4}$, $\rm CaGa_{2}Se_{4}$, $\rm CaIn_{2}S_{4}$, and $\rm CaIn_{2}Se_{4}$ single crystals, sharp emission peaks due to transitions between the energy levels of $\rm Ho^{3+}$, $\rm Er^{3+}$, and $\rm Tm^{3+}$ were observed at 11 K.
Mi-YangKim,김화택,Moon-SeogJin,Sang-AnPark,Nam-OhKim,Hyung-GonKim,Seung-CheolHyun,Chang-DaeKim 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.5
Undoped and Co2+-doped BaGa2S4, BaGa2Se4, BaIn2S4, and BaIn2Se4 single crystals were grown by using the chemical transport reaction method. The undoped and the Co2+-doped BaGa2S4 single crystals crystallized into a cubic structure, and the others into an orthorhombic structure. The optical energy gaps were found to be 4.125 eV, 3.372 eV, 3.162 eV, 2.433 eV, 3.057 eV, 2.323 eV, 2.625 eV, and 1.851 eV for the BaGa2S4, BaGa2S4:Co2+, BaGa2Se4, BaGa2Se4:Co2+, BaIn2S4, BaIn2S4:Co2+, BaIn2Se4, and BaIn2Se4:Co2+ single crystals, respectively, at 11 K. The temperature dependence of the optical energy gap was well fitted by the Varshni equation, but an anomalous temperature property was observed for the Co2+-doped single crystals below 50 K.