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Theory of non-Condon emission from the interchain exciton in conjugated polymer aggregates

J. Chem. Phys. 126, 191102 (2007); doi:10.1063/1.2741250

Published 17 May 2007

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Eric R. Bittner and Stoyan Karabunarliev
Department of Chemistry, University of Houston, Houston, Texas 77204 and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204

Laura M. Herz
Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
The authors present here a simple analysis that explains the apparent strengthening of electron phonon interaction upon aggregation in conjugated polymer materials. The overall scheme is that of an intermolecular Herzberg-Teller effect whereby sidebands of a forbidden transition are activated by oppositely phased vibrations. The authors show that upon aggregation, the 0-0 emission becomes symmetry forbidden and the apparent redshift and remaining vibronic structure are due to sideband (0-1,0-2, etc.) emission. At higher temperatures, the 0-0 peak is due to thermal population in a higher lying even-parity vibronic state rather than direct emission from the odd-paritied lowest intermolecular vibronic state. ©2007 American Institute of Physics
History: Received 21 November 2006; accepted 25 April 2007; published 17 May 2007
Permalink: http://link.aip.org/link/?JCPSA6/126/191102/1
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KEYWORDS and PACS

Keywords
PACS
  • 71.35.-y
    Excitons and related phenomena
  • 61.41.+e
    Structure of polymers, elastomers, and plastics
  • 71.38.-k
    Polarons and electron–phonon interactions
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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