Size-dependent fluorescence emission spectra and lifetimes of microcrystals of the dye N,N'-bis(2,5-di-tert-butylphenyl)-3,4:9,10-perylenebis(dicarboximide) (DBPI) studied by confocal fluorescence microscopy

被引:20
作者
Bisht, PB
Fukuda, K
Hirayama, S
机构
[1] KYOTO INST TECHNOL,CHEM LAB,SAKYO KU,KYOTO 606,JAPAN
[2] INDIAN INST TECHNOL,DEPT PHYS,MADRAS 600036,TAMIL NADU,INDIA
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 41期
关键词
D O I
10.1021/jp9710087
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The time-correlated single-photon counting (TCSPC) technique combined with confocal fluorescence microscopy has revealed the nonexponential character of the fluorescence decay (0.1-10 ns) for highly fluorescent single microcrystals of the dye N,N'-bis(2,5-di-tert-butylphenyl)-3,4:9 (DBPI) of a size as small as a few micrometers. Steady-state and time-resolved emission spectra of the microcrystals have also been measured with a fluorescence microscope. A size dependence is observed for both fluorescence emission spectra and lifetimes. The fluorescence decay profiles of the microcrystals, when observed with confocal optics, exhibit a dominant contribution of a short-lived (0.11-0.14 ns) component. From these results it has been concluded that the self-absorption effect is playing a major role in characterizing the fluorescence of microcrystals of DBPI with no contribution from any new emitting species.
引用
收藏
页码:8054 / 8058
页数:5
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