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In the paper the results of investigations of X-ray excitation spectra, thermostimulated luminescence and the influence of light illumination on the thermoluminescence glow curves of pure and Tb-doped PbWO4 crystals are presented. It is suggested that the F--centres are formed in PbWO4 crystals at filling oxygen vacancies near Pb3+ ions to three electrons under X-ray irradiation at 90 K. The nature of 108 K thermostimulated luminescence peak is connected with the [(WO3 + F-)-Pb3+] associations. It was established that thermal or optical destruction of this peak leads to appearance of the radiative transitions of excitons localized near the [(WO3 + F)-Pb2+] complex centres.

Recombination Processes in PbWO4:Tb3+Crystals

Recombination Processes in PbWO₄:Tb³⁺Crystals