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First experimental investigations on absorption and photoluminescence of the novel Hg_{3}TeCl_{4} monocrystals grown by the Bridgman method are reported. A comparison of the measurement results with theoretical band structure calculations of the Hg_{3}TeCl_{4} crystal confirmed that Hg_{3}TeCl_{4} is a wide-band-gap photoconductor (E_{g}= 3.64 eV at 24 K) with the effective masses of charge carriers...
Photoluminescence spectra of Tl_2In_2S_3Se layered single crystals have been studied in the wavelength region of 535-725 nm and in the temperature range of 22-58 K. Two photoluminescence bands centered at 564 (2.20 eV, A-band) and 642 nm (1.93 eV, B-band) were observed at T = 22 K. Variations of both bands have been investigated as a function of excitation laser intensity in the range from 16 to 516...
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