片状多层结构卤化银外延乳剂的光物理性质及感光性能的研究

THE PHOTOPHYSICAL AND PHOTOGRAPHIC PROPERTIES STUDY OF MULTISTRUCTURE EPITAXIAL TABULAR SILVER HALIDE MICROCRYSYALS

本文利用可控双注仪设计并制备了三种系列共二十种片状多层结构溴碘化银乳剂及其外延体。用Ｘ射线能谱仪（ＥＤＳ）和电镜验证所设计的碘离子多层分布和氯化银外延体的位置，研究了它们的光物理性质和感光性能，发现外延ＡｇＣｌ对主体微晶性质的影响随层次结构和外延位置不同有很大的变化。若主体微晶结构合理，光电子利用效率已经较高，电子与空穴分离好，外延后其乳剂的感光度提高幅度反而不大。相反，若主体微晶的结构不合理，则外延可能导致两种结果：或增加潜影形成效率，提高感光度；或造成潜影分散，降低感光度。

A series of unepitaxial and epitaxial multistructure tabular silver halide microcrystals with the same content but different distribution of iodide ions were prepared by double-jetprecipitation. The ditribution of iodide ions and the position of epitaxial AgCl in the micro-areas of a single microcrystal were analysed by the means of Scanning Transmissive ElectronMicroscope(STEM)and X-ray Energy Dispersive Spectrorneter(EDS).It was found thatthe iodide and chlorine ions are distributed in the different microareas of tabular microcrystals as designed.The photophysical and photographic properties were investigatd,The results showed that the influence of epitaxial AgCl on the property of tabular silver halide microcrystals apparently depends on the multistructure of original tabular iedobromide micrcocrystals. Reasonable structure with high utilizing efficiency of photoelectrons as well as withhigh original sensitivity has few contribution to enhancing its sensitivity after being epitaxized.On the other hand,there will cause two results after epitaxizing on the emulsion withunreasonable structure:increasing the efficiency of formation of latent image and increasingthe dispersion of latent image.