Photo-induced defects in CdS-doped glass were investigated by using luminescence and electron spin resonance techniques. A correlation was observed between the intensity of the electron spin resonance signal and the transient luminescence characteristics. This correlation suggested that the photo-induced centers, which were responsible for the electron spin resonance signal, caused photo-darkening. The photo-induced centers were assumed to be created in the interface between CdS micro-crystals and the glass matrix.

T.Miyoshi, K.Towata, H.Matsuki, N.Matsuo, T.Kaneda: Materials Science Forum, 1995, 196-201, 573-8