Механізм хімічної сенсибілізації при обробці киснем мікрокристалів AgBrI, спектрально сенсибілізованих аніонним барвником

In this work, the specific disperse systems are considered, which are formed in composite condense materials containing light-sensitive silver-halide microcrystals (MCs). Based on the low-temperature (T = 77 K) luminescent and spectrosensitometric properties of AgBrІ MCs, a mechanism is discussed for the influence of the oxygen treatment on the MCs’ spectral sensitization by an anionic dye. It is shown that, in contrast to the general view prevailing in the current literature, the effect of oxygen cannot be reduced only to decreasing the sensitivity of AgBrI MCs, and its role in the spectral sensitization of AgBrI MCs is not so unambiguous. Within the framework of the proposed mechanism, such ambiguity appears due to the fact that silver centers Ag+ and Ag2+, different in their structure, participate in the generation-recombination processes of nonequilibrium charge carriers, which interact with various aggregate forms of the dye adsorbed on the MC surface and are affected by oxygen in different ways. The results will be useful for numerous applications involving such MCs, in particular, for optimisation of holographic and spectrozonal photo-materials, gas-phase sensors and in solar energy systems.