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Optical and Thermal Stability of Ag Centres in RT X‐Irradiated KCl:Ag Crystals
Author(s) -
Sridaran P.,
Bhuniya R. C.,
Ratnam V. V.
Publication year - 1981
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.2221040208
Subject(s) - thermoluminescence , irradiation , ion , impurity , luminescence , doping , annealing (glass) , analytical chemistry (journal) , valence (chemistry) , electron , materials science , thermal stability , atomic physics , chemistry , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics , nuclear physics , composite material
Abstract The optical absorption, thermoluminescence (TL), monochromatic TL, and TL spectra of potassium chloride crystals doped heavily with silver are measured after X‐irradiation at RT. The effect of optical bleaching on X‐irradiated crystals with light in the F, E, and B bands both, separately and together, as well as thermal annealing effects of the defect centres are studied. It is found that in the heavily doped crystals the role of holes in the form of doubly charged impurity ions (Ag ++ ) is predominant compared to holes of the host lattice in the form of Cl 2 − etc. The Ag ions stabilised only at cation sites in different valence states are involved in the recombination‐luminescence process. From the TL spectral data of the glow peaks preferential redistribution of the excess electron centres on optical bleaching is evident. The results support that tunnelling of electrons is responsible for the observed TL and TL spectral data.