An Alternative Model for Photochromism of Glasses:Reversible Injection of Carriers from a Microrysal and Its Surface States into Point Defects of Glass

摘要

The radiation-induced absorption spectra of photochromic homogeneous slilicate glasses and heterogeneous borosilicate glasses containing AgCl,AgBr, or CuCl microcrystals are analyzed.The inference is made that these spectra contain the bands of traditional radiation-induced color centers (RICCs) in glasses and the bands of halide defects in microcrysals.The band model of the phtochromic process in the"microcrystal-surface states-glass"systemis proposed ont hebasis of te performed analysis withdue regard for burning of the excitionhole in the induced spectrum of CuCl-containing glass.This model makes it possible toexplain a large number ofexperimental data.