Absorption spectra of KCl:Bi 3+ crystals were measured at various temperatures. Six absorption bands were observed at 335, 245, 212, 207, 201 and 196 nm. The first five bands are assigned to the A, B, C 1 , C 2 and C 3 bands and the last to the charge-transfer D' band. The emission from KCl:Bi 3+ excited in the A absorption band was measured as a function of exciting photon energy and temperature. The A-band excitation produced two emission bands peaking at 388 and 430 nm, the excitation spectra of which are not the same. The temperature dependence of the decay times is described for the two emission bands. The polarized emission spectrum and the angular dependence of polarization ratios of the A-band emission were also investigated to determine the symmetry axes of the Bi 3+ -vacancies complex. The results are interpreted in terms of a model in which the reduction effect of the strong spin-orbit interaction on the Jahn-Teller effect coupling to the E g mode is taken into account An additional perturbation caused by two cation vacancies is required to present the definitive assignment of the A-band emission from KCl:Bi 3+ .
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Kang et al. (1994) studied this question.
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