Dresden 2014 – wissenschaftliches Programm
CPP 54.81: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Resonance Energy Transfer Between Nanotubular J-Aggregates and Quantum Dots — •Yan Qiao1, Frank Polzer1, Sergei Kühn2, Sebastian Friede2, Stefan Kirstein1, and Jürgen Rabe1 — 1Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany — 2Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie im Forschungsverbund Berlin e.V., Max-Born-Straße 2 A, 12489 Berlin, Germany
Resonance coupling between distinct excitons in organic / inorganic hybrid materials has become a promising approach towards the design of novel nano-structured opto-electronic devices [1,2]. Herein we report on the construction of colloidal nanohybrids built in aqueous solution from tubular J-aggregates of amphiphilic cyanine dyes and semi conducting quantum dots (QDs) of CdTe. QDs of different size were attached to the surface of the J-aggregates by electrostatic self-assembly. The close proximity between J-aggregates and QDs enables strong coupling between the dissimilar excitons with high energy transfer efficiencies. The direction of energy transfer is selected by the size of the QDs. FRET efficiency of 92% is achieved for transfer from QDs to the J-aggregates. For the opposite direction the J-aggregates act as light harvesting antennas and increase the effective absorption of the QDs by a factor of ten.
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