1989 Volume 58 Issue 8 Pages 2968-2975
The electronic structure of various types (one-center, two-center, and dimer complex) of self-trapped excitons (STE’s) in alkali halide crystals containing heavy halogen impurity atoms, has been studied by the extended-ion method (developed earlier for STE’s in pure alkali halides) coupled with a CNDO code. Results of the calculations for KCl:I, RbCl:I, and KCl:Br are generally in satisfactory agreement with experiment. In particular, two distinct configurations have been found for the two-centre type STE’s, which accounts for the blue and the blue-green emission bands. A general discussion of defect (F–H pair) formation mechanism in these systems, consistent with experimental observations, has also been presented.
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