O. Shpotyuk, E. Skordeva, R. Golovchak, V. Pamukchieva, and A. Kovalskii.
Journal of Applied Spectroscopy, vol. 66, No. 5, 1999, p. 749-753.
The radiative-optical properties of chalcogenide glass-like semiconductors of the As2S3-Ge2S3 system in the region of a topological 2D-3D-phase transition are investigated. It is shown that y-irradiation of samples by an absorbed dose of 4.4*106 Gy leads to a longwave shift of their optical-transmission edge in the spectrum. The effect observed depends on the structural type of the glasses investigated and changes considerably near the 2D-3D-phase transition. Two components of the transmission-edge shift are detected: a static component, which remains unchanged for a long time after irradiation of the samples, and a dynamic one, which gradually fades in 2-3 months. It is suggested that the microstructural mechanism of these changes is attributable to processes of coordination defect formation in the structural skeleton of the samples.