Abstract
We report photo-induced time-dependent photoluminescence (PL)from Ge–S glass that shows not only known PL fatigue but also a PLrecovery phenomenon—observed under prolonged irradiation by theexcitation light, even after PL fatigue—in Ge1−xSx glasses (0.67 ≤ x ≤ 0.90).The two phenomena have different time constants. Also, the fatigue processdepends strongly on glass composition, excitation energy and excitation intensity,while the recovery process depends clearly only on excitation intensity. Wepropose a simplified functional form to describe the time dependence that is basedon a model in which non-radiative recombination centres—created by thephoto-excitation of the PL centres—revert to radiative centres through thermalreaction. The proposed function reproduces the experimental data for allirradiation time domains.
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