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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Nanoparticles and Composite Materials II

CPP 41.3: Vortrag

Donnerstag, 25. März 2010, 14:30–14:45, H48

New Insights to Photo-destructive Effects on Quantum Dots — •Danny Kowerko¹, Jörg Schuster², and Christian von Borczyskowski¹ — ¹Center of nanostructured materials and analytics, TU-Chemnitz, 09107 Chemnitz — ²Fraunhofer-Einrichtung für Elektronische Nanosysteme ENAS, Technologie-Campus 3, 09126 Chemnitz

Energy and charge transfer in assemblies of semiconductor quantum dots (QDs) and organic (dye) molecules offer numerous applications in science and technology. The surface properties of CdSe and CdSe/ZnS colloidal QDs play a crucial role for the photoluminescence (PL) properties and thus the respective transfer efficiencies. In our contribution we demonstrate how PL quenching and enhancement are related to the surface. Therefore the influence of oxidation and surface adsorption by perylene bisimide (PBI) molecules will be elucidated by time-resolved ensemble and single particle spectroscopy. Irreversible and reversible spectral blue shifts are discriminated and related to surface and intrinsic modifications of the QD and conclusions for the efficiency of energy transfer are drawn.