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A new model for the visible emission of the CsI: Tl crystal.

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<mark>Journal publication date</mark>09/1994
<mark>Journal</mark>Chemical Physics Letters
Issue number4-5
Volume227
Number of pages6
Pages (from-to)533-538
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

Four emission bands, all belonging to the main thallium centre, are detected in a CsI:Tl crystal and their spectral, polarization and kinetic characteristics are studied at 1.7 to 320 K. Two weak ultraviolet bands (3.31 and 3.09 eV) are ascribed to electronic transitions from trigonal and tetragonal Jahn-Teller minima of the triplet relaxed excited state of Tl+. Two intense visible bands (2.55 and 2.25 eV) are assumed to arise from two different off-centre configurations of a self-trapped exciton perturbed by the Tl+ ion.