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Luminescence Accompanying the Recombination of Electrons with V F Centres in KCl Crystals
Author(s) -
Egemberdiev Zh.,
Zazubovich S.,
Seeman V.,
Nagirnyi V.
Publication year - 1982
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.2221090205
Subject(s) - luminescence , ion , electron , thermoluminescence , atomic physics , recombination , exciton , crystal (programming language) , absorption (acoustics) , vacancy defect , chemistry , materials science , physics , crystallography , optics , optoelectronics , condensed matter physics , biochemistry , organic chemistry , quantum mechanics , computer science , gene , programming language
Abstract Processes of an optical production of V F centres (holes localized near cation vacancy) are investigated by absorption, ESR, and thermoluminescence methods. It is established that V F centres are most effectively produced in KCl: PbCl, 2 crystals X‐irradiated at 80 K and subsequently heated up to 270 K, at the recombination of optically released electrons with V 2z (Pb 2+ ) centres (molecular Cl 3 −ions associated with Pb 2+ ions). After an optical production of V F centres, the stimulation in the electronic absorption bands (K or L 2 ) results in the appearance of luminescence with a peak at 3 eV and band half‐width equal to 0.75 eV. If V F centres are previously oriented by polarized light, the 3 eV emission becomes polarized in the directions perpendicular to the molecular axis of the oriented V F centres. The 3 eV emission quenches rapidly at 237 K and its depolarization occurs at 111 K. The same emission is observed in undoped KCl crystal. It is concluded that the 3 eV emission is caused by the recombination of electrons with V F centres. The same spectrum must have the triplet emission of a self‐trapped exciton perturbed by a cation vacancy.