几种光谱增感染料吸附在AgBr晶体上的光电导效应

使用AgBr晶体作为AgBr乳剂的模型,利用光电导法研究光谱增感的机理及染料的增感性能。采用“蚶埚下降法”重复地制备出了透明度相当好的AgBr晶体,还研究了晶体片的抛光与化学处理过程,这对于光电导实验都是重要的。对几种实用的光谱增感染料进行了光电导实验,实验结果与照相乳剂的光谱响应一致。而且观察到四氯咪碳菁与其它染料相比,光敏化电流有显著的不同。同时还进行了不同电荷染料的组合实验,由实验看到,由于染料吸附的先后次序不同,光电导曲线上峰电流的位置和大小发生了明显地变化,这对于照相乳剂的配制将具有一定的实际指导意义。

PHOTOCONDUCTION EFFECT OF SEVERAL SENSITIZING DYES ADSORBED ON AgBr CRYSTAL

The mechanism of sensitization and spectral response of dyes were investigated by photoconductivity method using AgBr crystal as a model of AgBr emulsion. AgBr crystal with good transparency was prepared by the "crucible-step-down" method. The processes of chemical treatment and the polish of the crystal piece were studied. Results of photoconductivity measurements of AgBr crystal adsorbing dyes used in practice was consistent with the spectral response of photographic emulsion. Moreover it was found that 5, 5’, 6, 6’-tetrachloro-l, 1’, 3, 3’-tetraethylbenzimidazolocarbocyanine apparently differs from other dyes. The results of photoconductivity of AgBr having adsorbed combined dyes with different electric charges showed that the position and height of photocurrent peak in the photoconductivity diagram changed markedly due to the order of adsorption of dyes on AgBr surface, which would be significant for the preparation of photographic emulsion.