Abstract
Abstract The authors report on luminescence of SnO-doped 60ZnO–40B2O3 (SZB) glasses melted in air and Ar atmosphere. In photoluminescence (PL), excitation spectra consist of two excitation bands, and the lower excitation band, emerging at lower energy with increasing amount of SnO, affects the optical absorption edge. The present SZB glasses can exhibit light emission by irradiation of near UV light, which is different from the zinc phosphate glass system. X-ray induced scintillation spectra indicate that concentration of Sn2+ mainly affects the intensity. 119Sn Mössbauer spectra show that a certain amount of Sn2+ centers in the SZB glass was oxidized to Sn4+ even when melted under the inert atmosphere, which is one of the reasons for the low PL quantum efficiencies, approximately 60%. The 119Sn Mössbauer spectra also suggest site dispersion of Sn2+ centers, whose local coordination states affect the optical absorption and luminescent properties.
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