Time dependent fluctuations of the non-radiative electronic excitation energy transfer in single nanoassemblies "semiconductor quantum dot – dye molecule"

Abstract

It was clearly demonstrated that single object experiments for nanoassemblies based on amine-capped CdSe/ZnS-AM quantum dots and (pyridyl)2 -perilene bisimide molecules (DTPP) may be considered as an unsurpassed tool to investigate subtle conformational changes and the related impact on interchromophoric dynamics. In fact, due to their intrinsic flexibility, DTPP molecules can realise a large variety of conformations on the experimental time scale of seconds to minutes. For this reason, the process of the non-radiative electronic excitation energy transfer QD→DTPP manifests itself in the dynamics the OD photoluminescence blinking, and this process becomes dependent on observation time, which can be followed quite in detail