溴碘化银核壳乳剂中电子的捕获和复合  

ELECTRON TRAPPING AND RECOMBINATION IN CORE-SHELL EMULSIONS

作　　者：王荣琴[1] 彭必先[1] 

机构地区：[1]中国科学院感光化学研究所

出　　处：《感光科学与光化学》1994年第3期252-258,共7页Photographic Science and Photochemistry

摘　　要：本文应用双注仪制备了在核表面进行不同程度还原增感和一系列溴碘化银核壳乳剂，在不同条件下测定了核表面形成的不同还原增感中心对乳剂微晶光电子衰减动力学及发光光谱的影响。结果表明：在一定增感温度和时间条件下，当Ｎａ＿２ＳＯ＿３用量低于５．４ｍｇ／ｍｏｌＡｇ时光电子衰减动力学为二级反应，而当Ｎａ＿２ＳＯ＿３用量超过２７ｍｇ／ｍｏｌＡｇ时，增感中心一部分作为空穴陷阱，另一部分作为电子陷阱，光电子衰减速率决定于电子的捕获和复合，光电了衰减动力学为一复杂过程。低温发光光谱随不同增感程度的改变证明：还原增感中心不是发光中心。Microwave photoconductivity and luminescence were studied on a series of core-shell AgBr I emulsions with different combinations of internal and surface sensitizations.For the emulsions with the low level of NaW_2SO_3 sensititization on the core,single first-order decays of the photoconductivity were observed,and for the emulsions with the highlevel of Na_2SO_3 sensitization on the core,the decay of the photoconductivity could notbe resolved into a single first-order or second-order process.The luminescence int ensityindicated that reduction sensitization centers did not act as the luminescence center incore-shell emulsions.

关 键 词：感光化学 核壳乳剂 发光 溴碘化银 

分 类 号：TQ571.1[化学工程—精细化工]