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首页> 外文期刊>Journal of Imaging Science and Technology >Photochromic Bleaching Mechanism of Vacuum-Deposited AgBr Films
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Photochromic Bleaching Mechanism of Vacuum-Deposited AgBr Films

机译：真空沉积AgBr薄膜的光致变色漂白机理

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摘要

A study has been made to establish the mechanisms of photo-chromic processes in vacuum-deposited AgBr films. These films are darkened by UV irradiation and bleached by heating in air. To establish the mechanisms, films heated in vacuo were compared. We found that the darkened films were bleached by heating in air but not in vacuo. The photochromic bleaching mechanism is explained in terms of recombination of dissociated Ag and Br. By heating in air, oxide layers are formed on the surfaces of AgBr films, and the oxides prevent the escape of dissociated Br gas from the films to the atmosphere. Therefore, dissociated Ag and Br species confined in the films together can be recombined upon heating. This recombination makes the photochromic repetition possible. With the films heated in vacuo, however, Br gas is allowed to escape through the surface because of the absence of an oxide barrier, and thus the darkened films cannot be bleached. Schematic models of photochromic processes are proposed.
机译：已经进行了研究以建立真空沉积的AgBr膜中的光致变色过程的机理。这些膜通过紫外线照射而变暗，并通过在空气中加热而漂白。为了建立机理，比较了在真空中加热的膜。我们发现变暗的薄膜是通过在空气中加热而不是在真空中加热而漂白的。用离解的Ag和Br的重组解释了光致变色的漂白机理。通过在空气中加热，在AgBr膜的表面上形成氧化物层，并且该氧化物防止了离解的Br气体从膜逸出到大气中。因此，限制在膜中的解离的Ag和Br物质可以在加热时重新结合。这种重组使得光致变色重复成为可能。然而，在真空下加热膜的情况下，由于不存在氧化物阻挡层，使得Br气体通过表面逸出，因此变暗的膜不能被漂白。提出了光致变色过程的示意图模型。

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