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Title: Probing photophysical processes in individual multichromophoric dendrimers by single-molecule spectroscopy
Authors: Hofkens, Johan ×
Maus, Michaƫl
Gensch, T
Vosch, Tom
Cotlet, Mircea
Kohn, F
Herrmann, A
Mullen, K
De Schryver, Frans #
Issue Date: Jan-2000
Publisher: Amer chemical soc
Series Title: Journal of the American Chemical Society vol:122 issue:38 pages:9278-9288
Abstract: Individual multichromophoric dendrimer molecules, bearing eight perylenecarboximide chromophores at the rim, immobilized in a thin polyvinylbutyral (PVB) film were studied by far-field fluorescence microscopy. Fluorescence intensity trajectories as a function of time (transients), spectra, and decay traces were recorded separately or simultaneously. For comparison, similar measurements have been performed on a model compound containing one perylenecarboximide chromophore. Collective on/off jumps of the fluorescence intensity were observed for single dendrimer molecules, resembling previously reported collective jumps for the emission of single light-harvesting antenna systems. Spectra and decays of both non-interacting and dimer-like interacting chromophoric sites could be distinguished within an individual dendrimer. Transitions between the different spectral forms and decay times, observed for a single molecule, underline the dynamic character of the interactions among the chromophores. Evidence for a stepwise bleaching process of the multichromophoric system was found. Furthermore, the single-molecule data incontestably prove the assumptions stated in the ensemble model.
URI: 
ISSN: 0002-7863
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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