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Colour Centres and Luminescence in KCl:Zn Crystals
Author(s) -
Bhuniya R. C.,
Rao S. E.
Publication year - 1985
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.2221310135
Subject(s) - luminescence , ionic radius , impurity , crystal (programming language) , analytical chemistry (journal) , chemistry , ion , ionic bonding , divalent , doping , absorption (acoustics) , absorption spectroscopy , spectral line , materials science , optics , optoelectronics , physics , organic chemistry , chromatography , computer science , programming language , astronomy , composite material
TL and MTL glow curves, TL spectra, X‐ray luminescence, and F bleaching characteristics of KCl:Zn crystals are studied. They are found to be very much different from those of crystals doped with divalent cations of larger ionic radius. Zn ++ ion introduces an absorption band at 272 nm. Z 1 centres are produced during irradiation but are destroyed upon F bleaching. The V band at 225 nm is very sensitive to F bleaching. The TL glow peak at 90 °C is the only predominant glow peak and it increases with X‐ray dosage. F bleaching reduces this peak and induces a strong one at 125 °C which is a weak shoulder in the unbleached crystal. Only one strong intrinsic emission appears at 425 nm in TL spectra, X‐ray luminescence, and MTL. Other intrinsic emissions are either very weak or are absent. These results are discussed in the light of electron trapping by the impurity and the I‐V complexes of nn and nnn separations it introduces in the crystal.