EFFECT OF PHOTODARKENING ON DYNAMICS OF VISIBLE AND INFRARED PHOTOLUMINESCENCEIN CDSXSE1-X-DOPED GLASS

Measurements of the decay of both visible and infrared luminescence in a commercial Shott color glass doped by CdSxSe1-x microcrystals are r eported. Dynamics of the visible luminescence is interpreted by a mode l according to which conduction-band carriers recombine by the Auger p rocess with a coefficient of similar to 10(-30) Cm(6)s(-1), and by mon omolecular decay to localized states. Photodarkening affects the latte r process. The growth of its rate constant was found to be identical w ith that of absorbance of the excited sample and interpreted in terms of an increase in the number of energy states localized on the surface . The infrared luminescence decays nonexponentially but the tails of d ecay curves can be approximated by an exponential function with a time constant of similar to 12 mu s. An analogy with the recombination of localized carriers in disordered semiconductors is discussed. There ha s not been found any effect of photodarkening on the dynamics of infra red luminescence.