Characterization of oriented oligo(phenylenevinylene) films and nano-aggregates by UV/Vis-absorption and fluorescence spectroscopy

被引：72
作者：
Egelhaaf, HJ
Gierschner, J
Oelkrug, D
机构：
[1] Institute of Physical Chemistry, University of Tübingen, D-72076 Tübingen
来源：
SYNTHETIC METALS | 1996年 / 83卷 / 03期
关键词：
oligo(phenylenevinylene); films; spectroscopy;
D O I：
10.1016/S0379-6779(96)04475-X
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Absorption maxima in spectra of vapor-deposited oligo(phenylenevinylenes) (OPVs) are blue shifted versus solution, revealing strong exciton coupling due to parallel alignment of the film-constituting molecules. The films are anisotropic, as shown by polarized angular-resolved absorption spectroscopy. OPV nano-aggregates precipitated from solution are also strongly anisotropic, as shown by steady-state and time-resolved fluorescence anisotropy measurements. Introducing bulky substituents into the OPVs reduces the degree of molecular alignment. Fluorescence spectra of OPV films and aggregates consist of several distinct components, which are due to emission from traps below the exciton band. The overall fluorescence quantum yield is shown to depend mainly on the concentration of traps, which in turn is determined by the degree of molecular alignment.
引用
收藏
页码：221 / 226
页数：6
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