Regensburg 2010 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 41: Nanoparticles and Composite Materials II
CPP 41.3: Talk
Thursday, March 25, 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.