Triplet relaxed excited state structure and luminescence of thallium‐doped alkali halides | Zendy

Nagirnyi V. | Zendy; Soovik † T. | Zendy; Vaino P. | Zendy; Zazubovich S. | Zendy; Jaanson N. | Zendy

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Triplet relaxed excited state structure and luminescence of thallium‐doped alkali halides

Author(s) -

Nagirnyi V.,

Soovik † T.,

Vaino P.,

Zazubovich S.,

Jaanson N.

Publication year - 1991

Publication title -

physica status solidi (b)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.51

H-Index - 109

eISSN - 1521-3951

pISSN - 0370-1972

DOI - 10.1002/pssb.2221640218

Subject(s) - excited state , luminescence , halide , metastability , alkali metal , chemistry , ion , singlet state , atomic physics , triplet state , excitation , thallium , materials science , inorganic chemistry , physics , optoelectronics , organic chemistry , quantum mechanics

For the first time a slow component is observed and studied in the decay kinetics of A T emission of TI + centres in KBr, KI, RbCl, and RbI crystals. The existence is established of a singlet metastable level below the doublet emitting one in each Jahn‐Teller minimum of the triplet excited state of the TI + centres. It is concluded that for all ns 2 ions in alkali halides the structure of the relaxed excited state is qualitatively the same, and it may adequately be described in terms of a theory that considers the Jahn‐Teller effect as a main interaction in the relaxed excited states of the luminescence centres. The nature is discussed of the weak emission bands appearing on excitation in the A absorption band of TI + centres besides the main A T and A X emission bands, earlier interpreted as hot luminescence of Tl + centres.

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