A reversible photo-induced coloration that was caused by light irradiation was investigated in super-ionic crystals. The reversible photo-induced absorption was found to be the result of irradiation with light that had wavelengths which ranged from 420 to 450nm. The proposed mechanism was associated with the ambipolar diffusion of optically excited electronic carriers that were screened by mobile ions. Color center creation in super-ionic crystals, due to additive coloring in I vapor, ionic implantation or -irradiation, was considered.

N.Kovaleva, A.Boris, S.Bredikhin, T.Awano: Radiation Effects and Defects in Solids, 1995, 134, 457-60