Electron-vibrational relaxation of photoexcited polyfluorenes in the presence of chemical defects: A theoretical study

被引：34

作者：

Franco, I

Tretiak, S

机构：

[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA

[3] Abdus Salam Int Ctr Theoret Phys, I-34014 Trieste, Italy

来源：

CHEMICAL PHYSICS LETTERS | 2003年 / 372卷 / 3-4期

关键词：

D O I：

10.1016/S0009-2614(03)00419-6

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：

A quantum chemical semiempirical investigation of electron-vibrational dynamics of photoexcited conjugated polyfluorenes shows that delocalized electronic excitations dominate the absorption, whereas chemical defects (if present) dramatically impact the emission by trapping the photogenerated exciton into a localized state and acting as guest emitters at recombination. These results offer theoretical insight into the effect of non-quenching defect sites in conjugated polymers and explain the origin of a controversial low energy emission band frequently observed in bulk polyfluorene samples. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：403 / 408

页数：6

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