Photoinduced Electron Transfer in Binary Blends of Conjugated Polymers

摘要

We report the first observation of photoinduced electron transfer between two pi-conjugated polymers in binary systems. Picosecond transient absorption and fluorescent spectroscopies of mixtures of n-type (electron accepting) poly(benzimidazobe nzophenanthroline ladder) (BBL) and p-type (electron donating) poly(p-phenylene benzobisthiazole) (PBZT) evidence intermolecular electron transfer when BBL is selectively photoexcited. The results suggest that blends of pi-conjugated polymers are supramolecular materials which have novel features such as delocalized radical ion pairs or diion pairs, novel properties, and implications for organic p-n junction devices, photodiodes, photovoltaic cells, photoreceptors, and molecular electronic devices. Observation of photoinduced electron transfer between the components of the binary blends also implies molecular level miscibility of the blends.