Intermolecular vibronic coupling in self-assembling molecular nanowires of hexabenzocoronene derivatives

Alexander John Fleming; Jonathan N. Coleman; Andreas Fechtenkoetter; Klaus Muellen; Werner J. Blau

doi:10.1117/12.475427

14 July 2003 Intermolecular vibronic coupling in self-assembling molecular nanowires of hexabenzocoronene derivatives

Alexander John Fleming, Jonathan N. Coleman, Andreas Fechtenkoetter, Klaus Muellen, Werner J. Blau

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-C_8,2) 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-C_8,2(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.

Citation Download Citation

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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