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Identification of different donor-acceptor structures via Förster Resonance Energy Transfer (FRET) in quantum-dot-perylene bisimide assemblies

 
: Kowerko, D.; Krause, S.; Amecke, N.; Abdel-Motaleb, M.; Schuster, J.; Dobrawa, R.; Würthner, F.; Borczyskowski, C. von

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International journal of molecular sciences 10 (2009), No.12, pp.5239-5256
ISSN: 1422-0067
ISSN: 1661-6596
English
Journal Article
Fraunhofer ENAS ()

Abstract
Nanoassemblies are formed via self-assembly of ZnS capped CdSe quantum dots (QD) and perylene bisimide (PBI) dyes. Upon assembly formation the QD photoluminescence is quenched, as can be detected both via single particle detection and ensemble experiments in solution. Quenching has been assigned to FRET and NON-FRET processes. Analysis of FRET allows for a distinction between different geometries of the QD dye assemblies. Time-resolved single molecule spectroscopy reveals intrinsic fluctuations of the PBI fluorescence lifetime and spectrum, caused by rearrangement of the phenoxy side groups. The distribution of such molecular conformations and their changed dynamics upon assembly formation are discussed in the scope of FRET efficiency and surface ligand density.

: http://publica.fraunhofer.de/documents/N-167494.html