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Proceedings Paper

Intermolecular vibronic coupling in self-assembling molecular nanowires of hexabenzocoronene derivatives
Author(s): Alexander John Fleming; Jonathan N. Coleman; Andreas Fechtenkoetter; Klaus Muellen; Werner J. Blau
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Paper Abstract

The vibronic structure of the luminescence and luminescence-excitation spectra of alkyl substituted hexa-peri-hexabenzocoronene (HBC-C8,2) and hexa(4-n-dodecylphenyl) substituted hexa-peri-hexabenzocoronene (HBC-PhC12) are described and explained in terms of the collective behavior of molecules in a molecular nanowire structure. The low concentration species of HBC-C8,2(10-13 M) was found to have a homogeneouly broadeend emission expected for an isolated molecule. At medium (10-8 M) and high (10-6 M) concentration the HBC moelcules aggregate into nanowires and a change in the vibronic and electronic structure is observed. The addition of exo-phenyl groups, as in the case of HBC-PhC12, was found to increase the configurational coordinate displacement in the photo-exicted state by increasing the intermolecular vibronic coupling. These result coroelate well with the observed reduced photo-luminescence efficiency of the HBC-PhC12 nanowires.

Paper Details

Date Published: 14 July 2003
PDF: 7 pages
Proc. SPIE 4991, Organic Photonic Materials and Devices V, (14 July 2003); doi: 10.1117/12.475427
Show Author Affiliations
Alexander John Fleming, Trinity College Dublin (Ireland)
Jonathan N. Coleman, Trinity College Dublin (Ireland)
Andreas Fechtenkoetter, Max-Planck-Institut fuer Polymerforschung (Germany)
Klaus Muellen, Max-Planck-Institut fuer Polymerforschung (Germany)
Werner J. Blau, Trinity College Dublin (Ireland)

Published in SPIE Proceedings Vol. 4991:
Organic Photonic Materials and Devices V
James G. Grote; Toshikuni Kaino, Editor(s)

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