Spectroscopic studies of chromium-doped silica sol–gel glasses
作者： W. Stręk , P.J. Dereń , E. Łukowiak , J. Hanuza , H. Drulis
DOI: 10.1016/S0022-3093(01)00610-X
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摘要: Abstract The results of EPR and optical measurements Cr-doped silica glasses obtained by means sol–gel technology are presented. effect Cr concentration on behavior was studied. Thermoluminescence observed after heating previously cooled UV irradiated samples. were performed for samples a strong temperature dependence the signal noticed. nature optically active centers discussed. It is concluded that associated with Cr5+ ions at tetrahedral sites whereas emission attributed to ligand–metal charge transfer transitions Cr6+ coupled Cr5+. No evidence found presence Cr3+ in gel glass.
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