The luminescence spectra, decay kinetics and yield of luminescence in undoped PbWO4 crystals were studied after pulsed electron beam irradiation. The rise time of luminescence pulses shows that two mechanisms — excitonic and recombination — were involved in luminescence center excited state formation. It is proposed that excited states of WO3 and WO2—4 luminescence centers were formed from some metastable state, possibly from Pb related excitation.
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Millers et al. (1997) studied this question.
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