Abstract
Luminescence spectra have been measured in TlBr doped with iodine ions under pulsed-light excitation. Two broad emission bands were observed at 2.2 and 2.45 eV . The emission band at 2.2 eV decays non-exponentially below 20 K and was attributed to radiative annihilation of a localized exciton bound to an I − ion formed by tunneling a hole to an electron trapped at a distant lattice position. The emission band at 2.45 eV , which decayed with two time constants of 0.5 μs and less than 20 ns , was attributed to annihilation of a perturbed self-trapped exciton. The luminescence decay of the 2.45 eV band was analyzed by rate equations, assuming that the initial states of the emission were composed of doubly-degenerate singlet-triplet mixed states and a triplet state.
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