立方体溴化银颗粒光谱增感的电子转移超快动力学研究

doi:10.7517/j.issn.1674-0475.2005.06.428

影像科学与光化学 ›› 2005, Vol. 23 ›› Issue (6): 428-434.DOI: 10.7517/j.issn.1674-0475.2005.06.428

立方体溴化银颗粒光谱增感的电子转移超快动力学研究

杨少鹏, 范国志, 曹宁, 李晓苇, 韩理, 傅广生

河北大学物理科学与技术学院, 河北保定071002

收稿日期:2005-08-02 修回日期:2005-09-07 出版日期:2005-11-23 发布日期:2005-11-23
通讯作者: 杨少鹏,E-mil:spyang@mail.hbu.edu.cn,电话:0312-5977056.
基金资助:
国家自然科学基金(10354001、60478033、10274017);河北省自然科学基金(603138);河北省博士基金(B2003119);河北大学博士基金资助项目

Picosecond Ultrafast Kinetic Study of Dyes Sensitized Silver Bromine Microcrystals

YANG Shao-peng, FAN Guo-zhi, Cao Ning, LI Xiao-wei, HAN Li, FU Guang-sheng

College of Physics Science and Technology, Hebei University, Baoding 071002, Hebei, P. R. China

Received:2005-08-02 Revised:2005-09-07 Online:2005-11-23 Published:2005-11-23

摘要/Abstract

摘要： 本文利用皮秒时间分辨条纹相机技术检测了3种染料在立方颗粒溴化银上吸附后形成聚集体的荧光光谱,分析了3种染料在不同染料浓度下对染料聚集体到溴化银导带的超快电子转移过程的影响,进而分析其对增感效率的影响关系,并探讨了增感过程的微观机理.实验结果表明,荧光衰减的动力学曲线与一个双指数函数拟合得相当好,存在一快一慢两个衰减成分,快衰减成分占拟合较大比例,表明其源于与荧光衰减相竞争的从激发态染料聚集体到AgBr导带的电子转移.光致电子转移的速率及增感效率随着染料相对浓度的增加表现出一定的变化趋势,染料浓度增加,增感效率减小.

关键词: 光谱增感, 电子转移速率, 条纹相机, 溴化银

Abstract: On the basis of Streak Camera technique,fluorescence spectroscopy of three kinds of dyes J-aggregate adsorbed on cubic AgBr microcrystals was detected in time resolve 5 ps.The dependence of ultrafast electron transfer from dye J-aggregate to conduction band of AgBr on different dyes with different concentration was analyzed.And the micro mechanism of sensitization was also analyzed.It is showed that the dynamic decay curves can be fitted well by a double-exponential function.The fitting curves are consisted of a fast component and a slow one.Because of the large amplitude of the fast component,the fast decay should be mainly attributable to the electron transfer from J-aggregate of dye to conduction band of AgBr.The photo-induced electron transfer rate and the sensitization efficiency show certain change tendency with the change of dye concentration.As the dye concentration increasing,the sensitization efficiency decreases.

Key words: spectral sensitization, electron transfer rate, Streak Camera, silver bromide

中图分类号:

杨少鹏, 范国志, 曹宁, 李晓苇, 韩理, 傅广生. 立方体溴化银颗粒光谱增感的电子转移超快动力学研究[J]. 影像科学与光化学, 2005, 23(6): 428-434.

YANG Shao-peng, FAN Guo-zhi, Cao Ning, LI Xiao-wei, HAN Li, FU Guang-sheng. Picosecond Ultrafast Kinetic Study of Dyes Sensitized Silver Bromine Microcrystals[J]. Imaging Science and Photochemistry, 2005, 23(6): 428-434.

参考文献

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立方体溴化银颗粒光谱增感的电子转移超快动力学研究

Picosecond Ultrafast Kinetic Study of Dyes Sensitized Silver Bromine Microcrystals

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