title: Intramolecular Förster energy transfer in a dendritic system at the single molecule level.
abstract: The photophysics of a dendrimer containing four donor chromophores and one acceptor chromophore are studied at the single-molecule level. Upon excitation of the donors exclusive acceptor emission is observed due to efficient Förster energy transfer. For 70% of the molecules donor emission is observed after bleaching of the acceptor, leading to a reduction of the Förster energy transfer efficiency. Furthermore, we demonstrate that in this molecular system the donor chromophores do not bleach by a triplet-sensitized photooxidation.
authors.affiliation: Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium.
authors.forename: Roel
authors.initials: R
authors.lastname: Gronheid
authors.forename: Johan
authors.initials: J
authors.lastname: Hofkens
authors.forename: Fabian
authors.initials: F
authors.lastname: Köhn
authors.forename: Tanja
authors.initials: T
authors.lastname: Weil
authors.forename: Erik
authors.initials: E
authors.lastname: Reuther
authors.forename: Klaus
authors.initials: K
authors.lastname: Müllen
authors.forename: Frans C
authors.initials: FC
authors.lastname: De Schryver