Abstract
Emission and excitation spectra of KCl:Tl, KBr:Tl, KI:Tl, NaCl:Tl and NaBr:Tl have been measured up to 36 kbar at room temperature. In the case of potassium halide, when the host crystal is transformed from the NaCl-type to the CsCl-type structure by applied pressure, the emission spectra show a discontinuous blue shift and grow significantly on their high energy sides, resulting in the overlap of the excitation and emission spectra. In the case of NaCl:Tl, the excitation and emission spectra also partially overlap each other with increasing pressure. It is discussed that the parameter S of Haung and Rhys in the Tl + -center decrease with increasing pressure.
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