Spectral studies on Cu2+ doped sodium leadbismuthate glasses

Copper doped sodium leadbismuthate glasses were prepared in the chemical composition (wt.%) 35Bi2O3+35PbO+(30-x)Na2O+xCuO (where x=1, 2, 3 and 4). The optical spectra of the glasses have been investigated. The optical absorption spectra of Cu2+ doped glasses show a broad absorption band between 560 and 880 nm, which is attributed to the 2Eg-->2T2g transition of Cu2+ ion. FTIR spectral studies confirm the Bi-O bonds and the presence of [BiO3] pyramidal units.