Intramolecular Förster energy transfer in a dendritic system at the single molecule level.
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.
Gronheid
Roel
R
Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium.
Hofkens
Johan
J
Köhn
Fabian
F
Weil
Tanja
T
Reuther
Erik
E
Müllen
Klaus
K
De Schryver
Frans C
FC