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Relaxed excited state structure and luminescence of thallium-doped caesium chloride and bromide.

Mihokova, E. and Nagirnyi, V. and Nikl, M. and Stolovich, A. and Pazzi, G. P. and Zazubovich, S. and Zepelin, V. (1996) Relaxed excited state structure and luminescence of thallium-doped caesium chloride and bromide. Journal of Physics: Condensed Matter, 8 (23). pp. 4301-4314. ISSN 0953-8984

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Abstract

Four bands, all belonging to the main thallium centres, have been detected in the emission spectra of CsCl:Tl and CsBr:Tl crystals. Their spectral, polarization and kinetic characteristics have been studied from 0.45 up to 360 K. It has been shown that the new model proposed by us recently for the relaxed excited state (RES) structure of the luminescence centre in CsI:Tl crystals is valid for CsCl:Tl and CsBr:Tl crystals as well. Two ultraviolet emission bands excited mainly in the A absorption band of Tl+ centres are ascribed to electronic transitions from trigonal and tetragonal Jahn-Teller minima of the tripler RES of Tl+. Two visible bands excitable mainly in the higher energy absorption bands of CsCl:Tl and CsBr:Tl are connected with two different off-centre configurations of self-trapped exciton perturbed by the Tl+ ion. The parameters of the corresponding excited state minima have been calculated. The mixing of the impurity and halogen excited states has been shown to decrease markedly in the sequence of anions I- --> Br- --> Cl-.

Item Type: Article
Journal or Publication Title: Journal of Physics: Condensed Matter
Uncontrolled Keywords: SELF-TRAPPED EXCITONS ; OFF-CENTER POSITION ; ALKALI-HALIDES ; CRYSTALS ; CSCL ; CSBR ; GA+ ; IN+
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23550
Deposited By: Dr Richard P. Haley
Deposited On: 03 Feb 2009 14:08
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23550

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