感绿光谱增感染料在氯化银微晶表面的电子陷阱效应  

Electronic trap effect of spectral sensitizing dye adsorbed on the surface of silver chloride

作　　者：李晓苇[1] 张继县[1] 张荣香[1] 赖伟东[1] 李莉[1] 代秀红[1] 傅广生[1] 

机构地区：[1]河北大学物理科学与技术学院,保定071002

出　　处：《物理学报》2007年第8期4401-4405,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10274017);河北省自然科学基金(批准号:103097)资助的课题.~~

摘　　要：光谱增感技术可使卤化银感光材料实现对全波段感光,同时光谱增感技术在现代光信息记录与存储、光电器件、太阳能转换与存储等领域具有重要的应用.应用微波吸收介电谱技术研究了立方体氯化银吸附感绿菁染料后的光电子衰减特性,建立了氯化银光电子衰减动力学模型,根据此模型结合光电子衰减实验结果对光谱增感染料吸附在卤化银表面的电子陷阱效应进行了分析.研究结果表明:当染料以单分子态吸附在卤化银表面时,染料起浅电子陷阱效应;染料以J聚集体吸附在卤化银表面时,染料起到了深电子陷阱效应.浅电子陷阱与深电子陷阱效应的临界浓度为每40g氯化银乳剂加入浓度为5.0mg/ml的染料0.2ml.实验结果为揭示光谱增感机理提供了依据.Using spectral sensitizing technology, silver halide microcrystals can be sensitized to the visible light region. The spectral sensitizing technology is important to the modern information recording and storage, solar energy transfer and storage, and the photoelectronic devices. The photoelectron decay characteristic of silver chloride microcrystals, which is adsorbed with green sensitizing cyanine dye, is studied by microwave absorption and dielectric spectrum detection technology. The model of photoelectron decay is set up. Electron trap effect of the dye in the silver halide surface is analyzed based on the photoelectron decay model and the photoelectron decay characteristic. The results show that when the mono-molecular dye is adsorbed on the surface, shallow electron traps are created; when the J-aggregated dye is adsorbed on the surface, deep electron traps are created. The critical dose of dye that seperates the shallow electron trap and deep electron trap effects is 0.2 ml of dye （with concentration of 5.0 mg/ml） per 40 g AgCl emulsion.

关 键 词：感绿染料 氯化银 光电子衰减 电子陷阱效应 

分 类 号：O431.2[机械工程—光学工程]