Abstract
Using electron spin resonance (ESR) and thermally stimulated luminescence (TSL) three different electron traps based on regular W sites perturbed by oxygen vacancies have been identified in PbWO 4 . Analysis of ESR spectra parameters ( g -factor values and principal axes orientations) has shown that revealed centers are (WO 3 ) m vacancy containing complex anions associated with a defect in Pb sublattice: (WO 3 ) m m A Pb complexes. One of the centers (W 1 ) is thermally stable up to 350-370 v K, while the other two (W 2 and W 3 ) only to 270-290 v K. Above these temperatures trapped electrons become free and recombine with localized holes, giving rise to TSL glow peaks at T\\approx 323\\,\\hbox{K} and 365\\,\\hbox{K} . Using the initial rise method the 323\\,\\hbox{K} TSL peak-shape was fitted allowing the first order recombination kinetic that gives trap parameters E = 0.88\\,\\hbox{eV} and s\\simeq 5\\ast 10^{12}1/\\hbox{s} .
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