COLOR-CENTER FORMATION AND ELECTRONIC EXCITATION PROCESSES IN SUPERIONIC CRYSTALS RBAG4I5

The effect of photoinduced reversible coloration was discovered and in vestigated in superionic RbAg4I5 crystals exposed to light irradiation 2.92 eV less than or equal to h nu less than or equal to E(g) = 3.2 e V at T = 300 K. Spectral efficiency measurements of the photoinduced e ffect let to the discovery that profound changes in the absorption spe ctrum of RbAg4I5 crystals are observed on 2.92 eV light irradiation. R elaxation of the photoinduced absorption after cessation of the irradi ation was found to be of exponential form with a time constant of abou t 900 s. The mechanism of the photoinduced coloration is considered to be due to self-trapped holes injection under the irradiation of RbAg4 I5 superionic crystals.