Temperature-dependent exciton dynamics in poly(p-phenylene vinylene) measured by femtosecond transient spectroscopy

被引：53

作者：

Lim, SH ^{[1
]}

Bjorklund, TG ^{[1
]}

Bardeen, CJ ^{[1
]}

机构：

[1] Univ Illinois, Dept Chem, Urbana, IL 61801 USA

来源：

CHEMICAL PHYSICS LETTERS | 2001年 / 342卷 / 5-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(01)00657-1

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：

Exciton delocalization in the conjugated polymer poly(p-phenylene vinylene) (PPV) is investigated using temperature-dependent spectroscopy. As the temperature is lowered, the steady-state absorption and fluorescence spectra indicate increased electronic conjugation and exciton delocalization. Femtosecond transient absorption measurements at 20 and 290 K over the wavelength range 520-650 nm provide evidence that such delocalization occurs within the first 10 ps after photoexcitation. Comparison of the 20 and 290 K data, along with anisotropy studies, suggests that vibrational cooling plays a significant role in the spectral dynamics observed in PPV on this timescale. (C) 2001 Elsevier Science B.V. All rights reserved.

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收藏

页码：555 / 562

页数：8

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