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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+.