Orientation dependence of fluorescence lifetimes near an interface

被引:59
作者
Kreiter, M [1 ]
Prummer, M [1 ]
Hecht, B [1 ]
Wild, UP [1 ]
机构
[1] Swiss Fed Inst Technol, Swiss Fed Inst Technol, Chem Phys Lab, CH-8092 Zurich, Switzerland
关键词
D O I
10.1063/1.1515732
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 fluorescence lifetime of single DiI-dye molecules in a 20 nm polymer film on glass is measured as a function of the orientation of the absorption dipole moment. A strong dependence of the lifetime on the orientation of the dye molecules relative to the polymer/air interface is found. Molecules with a dipole moment perpendicular to the interface exhibit a lifetime which is by a factor of 2.1+/-0.1 longer than the lifetime of molecules with parallel dipole moments. The general trend of the results is in good agreement with theoretical predictions. However there are significant deviations which are attributed to varying molecular environments. (C) 2002 American Institute of Physics.
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页码:9430 / 9433
页数:4
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