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Luminescence of KI: Pb Crystals
Author(s) -
Nagirnyi V.,
Nikl M.,
Polak K.,
Zazubovich S.,
Jaanson N.
Publication year - 1993
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.2221780117
Subject(s) - luminescence , excited state , polarization (electrochemistry) , kinetic energy , atmospheric temperature range , spin–orbit interaction , atomic physics , crystal (programming language) , mean kinetic temperature , materials science , chemistry , molecular physics , condensed matter physics , physics , optoelectronics , thermodynamics , quantum mechanics , computer science , programming language
Spectral, polarization, and kinetic characteristics of triplet luminescence of Pb 2+ v c − centres in KI:Pb are studied in the temperature range from 4.2 to 250 K. It is suggested that thermally stimulated T → X transitions as well as the transitions between T or X minima of various orientations can explain the temperature dependences of the intensities and the polarization degrees of luminescence (near 70, 30, and 130 K, respectively). It is concluded that in spite of a strong spin‐orbit coupling in the KI:Pb crystal, the Jahn‐Teller effect can be considered as the main interaction in the relaxed excited state (RES) of Pb 2+ v c − centres. A considerable influence of spin‐orbit interaction on the structure of RES was also detected.