Abstract
Luminescence spectra have been measured in TlBr doped with iodine ions under the pulse light excitation. Two broad emission bands were observed at 2.2 v eV and 2.45 v eV. The emission band at 2.2 v eV decayed nonexponentially and was attributed to the radiative recombination of trapped holes and electrons from the measurements of the decay properties and the spectral shape of the emission band. The emission band at 2.45 v eV decayed with two time constants of 0.5 v µs and less than 10 v ns. The fast decay component was assigned to the radiative annihilation of the singlet-triplet mixed state of the self-trapped exciton. The slow decay component was attributed to the triplet state of the exciton, which will be weakly allowed by an iodine ion.
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