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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.
Optical Properties of BaGa₂S₄: Tm³+ and BaGa₂Se₄: Tm³+ Single Crystals
Sang-AnPark,Moon-SeogJin,Chang-SunYoon,Choong-IlLee,Mi-YangKim,Se-JongBaik,Wha-TekKim 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.6
BaGa2S4: Tm3+ and BaGa2Se4: Tm3+ single crystals were grown by using a chemical transport reaction method. The optical energy gaps of the BaGa2S4: Tm3+ and the BaGa2Se4: Tm3+ single crystals were found to be 4.005 eV and 2.983 eV, respectively, at 11 K. The temperature dependence of the optical energy gap was well tted by the Varshni equation. Sharp emission peaks were observed in the photoluminescence spectra of the single crystals. They were assigned to radiation recombination between split Stark levels of Tm3+.