Single-Molecule Studies of Electronic Energy Transfer in a Diblock Conjugated Polymer

摘要

Electronic energy transfer across a molecular interface between two dissimilar conjugated polymers in a blend is a critical process for many promising optoelectronic device strategies.[1]-[9] Owing to the short range of electronic energy transfer, this process should in principle be strongly modulated by molecular-scale morphology in the interfacial regions of polymer blends. The most common approach for characterizing energy transfer in polymer blends, namely, ensemble fluorescence measurements, is obscured by morphological and kinetic heterogeneity of these materials and thus has done little to unravel the role of morphology in the energy-transfer process. Even nearfield scanning optical microscopy, which has been used to study polymer blends at the sub-100-nm scale,[10], [11] lacks the spatial resolution in most cases to study individual morphological regions that can be as small as a few nanometers.