影像科学与光化学 ›› 1996, Vol. 14 ›› Issue (3): 250-255.DOI: 10.7517/j.issn.1674-0475.1996.03.250

• 研究简报 • 上一篇    下一篇

卤化银乳剂颗粒上不对称菁染料J-聚体荧光的研究

齐晓燕, 陈次平, 周本茂, 阎文鹏   

  1. 中国科学院感光化学研究所, 北京100101
  • 收稿日期:1995-07-20 修回日期:1996-03-29 出版日期:1996-08-20 发布日期:1996-08-20
  • 通讯作者: 陈次平
  • 基金资助:
    国家自然科学基金

INVESTIGATION ON FLUORESCENCE OF J-AGGREGATES OF NON-SYMMETRIC CYANINE DYES ON SILVER HALIDE EMULSION GRAINS

QI Xiaoyan, CHEN Ciping, ZHOU Benmao, YAN Wenpeng   

  1. Institute of Photographic Chemistry, The Chinese Academy of Sciences Beijing 100101, P.R. China
  • Received:1995-07-20 Revised:1996-03-29 Online:1996-08-20 Published:1996-08-20

摘要: 光谱增感机理的研究是感光科学中的一个重要课题Gilman[1]和Kuhn等[2]曾经提出光谱增感的电子转移和能量传递理论。随着现代谱学手段的出现,为人们了解光谱增感的初始过程提供了条件。近年来,电子转移的机理已被广泛接受,并用来解释与光谱增感有关的各种现象。但在ns~ps范围内的光谱增感动力学方面的研究还不多见。Dahne认为光谱增感不仅决定于染料与卤化银的能级关系,而且是由动力学控制的[3],激发态染料向卤化银导带注人电子的电子转移过程与辐射及其他无辐射去活过程是竞争的[4]我们通过对两种不对称的苯并咪哇唾碳著染料在AgBrI乳剂颗粒上吸附形成的J一聚体的荧光性质的研究,以求深人了解光谱增感的电子转移机理及其动力学过程,无疑是有重要意义的。

关键词: 光谱增感, 染料J-聚体, 荧光, 荧光寿命, 电子转移

Abstract: The fluorescence of J-aggregate of two non-symmetric cyanine dyes adsorbed on the AgBrI emulsion grains was investigated. An inverse relationship is found between the relative quantum yield of the J-aggregate fluorescence of the dyes and the relative quantum efficiency of spectral sensitization. The rate constants of electron transfer from dyes to silver halide grains were obtained by measuring fluorescence lifetime.The experimental results support the electron-transfer mechanism of spectral sensitization and reveal its kinetics process.

Key words: spectral sensitization, J-aggregate of dyes, fluorescence, fluorescence lifetime, electron transfer