Abstract
The EPR, XRD, IR transmission, optical absorption, photoluminescence and its decay kinetics in lead-silicate glass with complex 0.521Pb3O4-0.371SiO2-0.068ZnO-0.027K2O-0.013BaO composition, doped with CuO (or PbSiZnKBaO:CuO) were studied. The observed characteristic EPR spectrum of the Cu2+ (3d9, 2D5/2) paramagnetic ions were adequately described using the spin Hamiltonian formalism. Average interatomic distances and coordination numbers for main structural units, SiO4 and PbOn (n = 4–6), in the network of studied glass were determined from radial distribution functions. Broad absorption band with a peak about 870 nm was ascribed to the 2B1g → 2B2g transition of the Cu2+ centers. Optical band gap and Urbach energy of the studied glass were evaluated. Photoluminescence spectra and decay curve of the Cu+ (3d10, 1S0) centers in PbSiZnKBaO:CuO glass were registered and interpreted. The PbSiZnKBaO:CuO glass upon UV excitation demonstrates intense emission band at 574 nm with fast kinetics belonging to intrinsic recombination luminescence.
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