Abstract
We closely examined relaxation processes between even and odd parity excitons in poly( p-phenylene vinylene) derivative polymers using a multiple femtosecond pulse transient spectroscopy. By tuning the energy of re-excitation and probe pulses across a wide spectral range, we were able to measure a complete spectrum of the 1B u exciton and also probe its counterparts: higher lying mA g and kA g excitons. Dramatically different relaxation paths were found for two later states: whereas the majority of mA g excitons experience an ultrafast internal conversion back to their 1B u state, most of kA g excitons transform into a non-emissive state, which we attribute to weakly bound polaron pairs.
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