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Title: Unraveling Excited-State Dynamics in a Polyfluorene-Perylenediimide Copolymer
Authors: Fron, Eduard ×
Deres, Anna
Rocha, Susana
Zhou, Gang
Muellen, Klaus
De Schryver, Frans
Sliwa, Michel
Uji-I, Hiroshi
Hofkens, Johan
Vosch, Tom #
Issue Date: Jan-2010
Publisher: Amer chemical soc
Series Title: Journal of physical chemistry b vol:114 issue:3 pages:1277-1286
Abstract: Insight into the exciton dynamics Occurring in a polyfluorene-perylenediimide (PF-PDI) copolymer with a reaction Mixture ratio of 100 fluorene units to 1 N,N'-bis(phenyl)-1,6,7,12-tetra(p-tert-octylphenoxy)-perylene-3,4,9,10-tetracarboxylic acid diimide (PDI) is presented here. Time-correlated single photon counting and femtosecond transient absorption spectroscopy measurements on the PF-PDI copolymer have been employed to investigate the excited-state properties of the polyfluorene subunit where the exciton is localized (PF) and the incorporated PDI chromophore. The experimental results were compared with those obtained from a polyfluorene polymer (model PF) and a N,N'-bis(2,6-diisopropylphenyl)-1,6,7,12-tetra(p-tert-octylphenoxy)perylene-14,91, I 0-tetracarboxylic acid diimide (model PDI) which were used as reference compounds. Because of the high polydispersity of the PF-PDI copolymer, there is a polymer fraction present that contains no PDI chromophores (polyfluorene polymer fraction (PIT polymer fraction)), and wide-field imaging of single polymers chains of the synthesized PF-PDI copolymer was used to estimate this PF polymer fraction. Following the primary excitation of the PIT in the PF-PDI copolymer, energy hopping between PF's can occur. A fraction of the energy of the absorbed photons will be transferred to a PDI chromophore via energy transfer from a PIT. In a polar solvent, a charge transfer state having the S, of the PDI moiety as a precursor state is found to form with high efficiency oil a nanosecond time scale. The data suggest that a fraction of the absorbed energy is directed, transferred, and used in charge separation, providing a clear view of a multistep mechanism of exciton dissociation into charges.
ISSN: 1520-6106
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
Chemistry - miscellaneous
× corresponding author
# (joint) last author

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