Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Nanoparticles and Composite Materials

CPP 8.22: Poster

Montag, 26. März 2012, 17:30–20:00, Poster A

Motion and Fluorescence of Charged Single Quantum Dots in an Electric Field — •David Plotzki, Nicole Amecke, and Frank Cichos — Molecular Nanophotonics Group, University Leipzig

Semiconductor Quantum Dots exhibit several interesting optical properties, one of them being a characteristic photoluminescence intermittency (blinking) which is not yet fully understood. It is assumed to be closely linked to charges that influence the underlying relaxation processes.

We study the motion and intensity of CdSe/ZnS Quantum Dots dispersed in toluene and dodecane in the presence of an electric field (up to 200 V/cm). A wide-field microscope setup is used to capture and track the particles. From this, the relative intensities and drift velocities can be determined and conclusions about present charges can be drawn.

We are seeking to observe the exchange of charges at the electrodes by a change in the fluorescence state.