影像科学与光化学 ›› 1994, Vol. 12 ›› Issue (3): 252-258.DOI: 10.7517/j.issn.1674-0475.1994.03.252

• 研究论文 • 上一篇    下一篇

溴碘化银核壳乳剂中电子的捕获和复合

王荣琴, 彭必先   

  1. 中国科学院感光化学研究所, 北京100101
  • 收稿日期:1993-08-23 修回日期:1994-02-03 出版日期:1994-08-20 发布日期:1994-08-20
  • 通讯作者: 王荣琴

ELECTRON TRAPPING AND RECOMBINATION IN CORE-SHELL EMULSIONS

WANG RONG-QIN, PENG BI-XIAN   

  1. Institute of Photographic Chemistry, Academia Sinica, Beijing 100101, P.R. China
  • Received:1993-08-23 Revised:1994-02-03 Online:1994-08-20 Published:1994-08-20

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Na2SO3用量低于5.4mg/molAg时光电子衰减动力学为二级反应,而当Na2SO3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。

关键词: 感光化学, 核壳乳剂, 光导, 发光

Abstract: 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 NaW2SO3 sensititization on the core,single first-order decays of the photoconductivity were observed,and for the emulsions with the high level of Na2SO3 sensitization on the core,the decay of the photo conductivity 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 in core-shell emulsions.

Key words: photographic chemistry, core-shell emulsion, photoconductivity, lumi-nescence