Abstract
Decay kinetics of visible emission of thallium centre in CsCl : Tl, CsBr : Tl and CsI : Tl crystals is studied in the magnetic field B | [0 0 1] at 0.35–0.45 K. Our previous interpretation of this emission as the triplet luminescence of the self-trapped exciton perturbed by Tl + ion is confirmed. However, the detailed structure of the corresponding relaxed excited state is found to be much more complicated than that concluded before.
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