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Polarized Singlet and Triplet Luminescence and Off‐Centre Position of Excited In + Ions in a CsBr :In Crystal
Author(s) -
Nagirnyi V.,
Vaino P.,
Zazubovich S.
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.2221670227
Subject(s) - excited state , ion , singlet state , atomic physics , luminescence , tetragonal crystal system , chemistry , triplet state , metastability , crystal (programming language) , molecular physics , crystal structure , crystallography , physics , optics , programming language , organic chemistry , computer science
Spectral and polarization characteristics as well as the decay kinetics of the CsBr : In luminescence are investigated in the temperature range from 1.75 to 300 K. Four emission bands (at 2.44, 2.75, 3.27 and 3.32 eV) are observed at low temperatures and interpreted correspondingly as A T , A x , B, and C emission of In + centres. The symmetry of the Jahn‐Teller minima of the triplet relaxed excited state (RES) responsible for the A x and the B emission is established to be trigonal and rhombic, respectively. The A T and the C emission is caused by the radiative decay of the tetragonal Jahn‐Teller minima of the triplet (A) and the singlet (C) excited state. Two slow components are found in the decay kinetics of both, the A T and the A x emission at T ⪅ 3 K. It points to the splitting of the metastable level both, in the tetragonal (T) minima and in the trigonal (X) minima of the triplet RES. It is shown that the effects observed are caused by an off‐centre displacement of the In + ion in the triplet RES from a crystal lattice site. For excited ns 2 ions in CsCl‐type hosts these effects are not observed before. This is the first observation of the off‐centre effects in the trigonal minima of the triplet RES of ns 2 ions.