Infusing varying mole concentrations of Li2O within the structure of lead bismuthate to form Li2O- can increase the transmittance spectra of lead bismuthate glass within and beyond the visible range.7 The figure shows the UV-Vis spectra of lead bismuthate glass compositions with (a) 20, (b) 30, (c) 40, (d) 50 and (e) 60 mole percent of Li2O.7