Temperature dependence of the photoinduced fatigue-recovery phenomena of photoluminescence under prolonged irradiation in GeS2 chalcogenide glass

We report the time-dependent intensities for the photoluminescence (PL) at various temperatures (10 K ? T ? 300 K) in amorphous GeS₂, which is known to exhibit not only PL fatigue but also PL recovery behavior. A difference in reversibility in fatigue-recovery process was found between room temperature (RT) and those at 110 K or below. Another small band of PL was also observed at 10 K or less, which also showed a time-dependence in intensity. A functional form to describe the time dependence was adopted based on a simplified model which have been obtained in a previous study and extended to describe the fatigue-recovery behaviors for all temperature range which have measured below RT.