Relations between UV/Vis absorption edge position, shape and composition have been discussed for many bismuth oxide glasses, BaO-Bi O_r R_hO_r (R_hO_r: B_2O_3, SiO_2, P_2O_5 etc.). Peaks and/or shoulders at edges of absorption spectra of many of those glasses have been reported for the first time and attributed to structure change caused by addition of some conventional glass formers (R_hO_r. indicated above). Optical gaps are all found to have energies which decrease with the contents of heavy metal oxide in the glasses. The optical spectra of these glasses show typical features of electronic energy level structures similar to that of semiconductors.
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