The origin of the photostructural changes in chalcogenide glasses is related to the existence in the glasses of negative-U centres as basic charge carriers so that gap-light generated excited states of the centres generate metastable defects in the original structure. The theory gives rise to a consistent description of, and some prediction for, dependencies of the steady-state photodarkening on gap-light intensity and frequency, pressure and temperature.
Origin
Bar-Ilan University, Israel
Journal Title
9Th Int Conf Corning - Phys Chem Glasses 46 4 2005 463 466
Sector
Special Glass
Class
S 3073