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14 July 2003 Intermolecular vibronic coupling in self-assembling molecular nanowires of hexabenzocoronene derivatives
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Proceedings Volume 4991, Organic Photonic Materials and Devices V; (2003) https://doi.org/10.1117/12.475427
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States
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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexander John Fleming, Jonathan N. Coleman, Andreas Fechtenkoetter, Klaus Muellen, and Werner J. Blau "Intermolecular vibronic coupling in self-assembling molecular nanowires of hexabenzocoronene derivatives", Proc. SPIE 4991, Organic Photonic Materials and Devices V, (14 July 2003); https://doi.org/10.1117/12.475427
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