Recombination Processes in PbWO4:Tb3+ Crystals

S. Novosad, L. Kostyk, I. Novosad and O. Tsvetkova Lviv I. Franko National University, Universitetska st. 1, 79000 Lviv, Ukraine

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In the paper the results of investigations of 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 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.

DOI: 10.12693/APhysPolA.117.143 PACS numbers: 78.55.Hx, 78.60.Kn, 78.70.En