Photodarkening and Photobrightening in Glasses Doped with CdS and CdSxSe1-x Nanocrystals

The photobrightening of photodarkened CdS- and CdSxSe1-x-doped glasses has been investigated with luminescence experiments. Photobrightening depends on the wavelength of laser light, and is observed in all samples investigated, when the wavelength of laser light is longer than that of the absorption edge. Photobrightening is explained by considering the reexcitation of trapped electrons in glass.