S.S.Novosad

Received June 30, 1998, in final form July 12, 1999

Optical absorption spectra, spectral sensibility of the photoelectret state and luminescence properties of the cadmium bromide crystal activated from the melt by metallic cadmium have been investigated under both X-ray and N₂-laser excitation. Basing on the CdBr₂, CdI₂>, CdBr₂:CdI₂, CdBr₂:CdO and CdI₂:Cd spectral characteristics, it has been found that a super-stoichiometric cadmium presence in CdBr₂ causes an increase of the self-activator center concentration responsible for the luminescence with maximum at 640-650 nm. This emission has been assumed to be caused by anion excitons localized on bromine vacancies, which form associates with interstitial cadmium atoms. The thermal activation energies of trapping centers responsible for the thermostimulated luminescence of CdBr₂:Cd in the 85-295 K temperature interval have been estimated. The nature of trapping levels in cadmium bromide crystals is discussed.

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