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Thermal Changes of Impurity Core–Valence Luminescence in K 1–x Cs x Cl and Rb 1–x Cs x Cl Mixed Crystals
Author(s) -
Mikhailik V. B.,
Voloshinovskii A. S.,
Kisand V.,
Vielhauer S.
Publication year - 1999
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/(sici)1521-3951(199904)212:2<367::aid-pssb367>3.0.co;2-b
Subject(s) - impurity , luminescence , excitation , atomic physics , phonon , valence (chemistry) , emission spectrum , lattice (music) , materials science , atmospheric temperature range , condensed matter physics , spectral line , core (optical fiber) , thermal emission , thermal , molecular physics , chemistry , physics , optoelectronics , organic chemistry , quantum mechanics , astronomy , meteorology , acoustics , composite material
Impurity core–valence luminescence (CVL) spectra arising under selective VUV excitation of highest‐lying 5pCs core states in K 1– x Cs x Cl and Rb 1– x Cs x Cl mixed crystals has been studied in a wide temperature range (7 to 330 K). The single‐peaked emission band at 4.5 eV is revealed to demonstrate significant thermal broadening caused by phonon‐assisted lattice‐relaxation effects in vicinity of impurity core holes. A model of localized emission centres is shown to account reasonably well for the experimental observations. The influence of both concentration and lattice‐relaxation effect on the emission spectrum shape in the high‐ and low‐energy regions is shortly discussed.