Berlin 2005 – wissenschaftliches Programm
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SYOO: Organic Optoelectronics and Photonics
SYOO 6: Poster
SYOO 6.51: Poster
Montag, 7. März 2005, 18:00–20:00, Poster TU A
Energy transfer excitation of single molecules using colloidal semiconductor nanoantennae — •K. Becker1, J. M. Lupton1, D. V. Talapin2, H. Weller2, A. L. Rogach1, and J. Feldmann1 — 1Photonics and Optoelectronics Group, Physics and CeNS, LMU München — 2Institute of Phys. Chem., Univ. of Hamburg
Hybrid systems based on inorganic and organic materials offer advantages over pure systems consisting of only one type of material. We present experiments on the energy transfer in a system of single elongated rod-like semiconductor core-shell nanoparticles [1] embedded in a film of dye molecules showing that nanoparticles can act as tiny antennae collecting the excitation energy and delivering it to the dye molecules. When illuminating the sample, a local increase of the dye’s photoluminescence at the spatial positions of the individual nanoparticles is observed, demonstrating energy transfer from the nanoparticles to the surrounding dye molecules. Correspondingly, the donor emission is considerably quenched and its fluorescence lifetime is shortened. Blinking and one-step photobleaching of the dye show typical fingerprints of single molecules. Energy transfer excitation of dye molecules therefore provides a unique way of addressing single emitters in an ensemble using spatially discrete nanoantennae.
[1] D. V. Talapin et al., Nano Lett. 3, 1677 (2003)