Abstract
The influence of γ and UV irradiation on the optical properties of thin film chalcogenide glasses Ge 15 Se 82.5 Ag 2.5 has been studied. An increase in the optical energy gap is observed after γ -irradiation with an exposure dose higher than 100 kGy and up to 1050 kGy. The results of γ -irradiation are discussed in terms of the structural aspects of Ge 15 Se 82.5 Ag 2.5 glass system. Photo-induced changes of the optical properties by UV-irradiation are also analyzed. The observed changes are associated with the interaction of the incident photon and the lone-pairs electrons which affects the band gap of the Ge 15 Se 82.5 Ag 2.5 system. The changes in band tail width of the localized state after irradiation with γ or UV are found to have an opposite trend compared with the changes in the optical band gap. The X-ray structural characterization revealed the amorphous nature of the films before and after γ and UV irradiation.
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