title: Coherent electronic coupling versus localization in individual molecular dimers.
abstract: We have investigated electronic excitation transfer in individual molecular dimers by time and spectrally resolved confocal fluorescence microscopy. The single molecule measurements allow for directly probing the distribution of the electronic coupling strengths due to static disorder in the polymer host. We find dimers where the excitation is delocalized (superradiant emission) while for others emission originates from a localized state. Transitions between delocalized and localized states as observed for a given dimer are attributed to structural fluctuations of the guest-host system.
authors.affiliation: Institut für Physikalische Chemie, Johannes Gutenberg-Universität, Welderweg 11, D-55099 Mainz, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Lippitz
authors.forename: Christian G
authors.initials: CG
authors.lastname: Hübner
authors.forename: Thomas
authors.initials: T
authors.lastname: Christ
authors.forename: Holger
authors.initials: H
authors.lastname: Eichner
authors.forename: Patrice
authors.initials: P
authors.lastname: Bordat
authors.forename: Andreas
authors.initials: A
authors.lastname: Herrmann
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen
authors.forename: Thomas
authors.initials: T
authors.lastname: Basché