Dynamic Stark effect as a probe of the evolution of geminate electron-hole pairs in a conjugated polymer

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Abstract
Transient absorption of methyl substituted ladder-type poly(para-phenylene) has been studied by means of picosecond pump-probe spectroscopy in the presence of an applied electric field. A transient Stark shift of the absorption band was observed and related to kinetics of generated excitons and electron-hole pairs. We demonstrate that dynamics of the Stark shift provide unique information on the charge redistribution in excited states, in particular, it allows us to monitor the charge separation distance during the exciton dissociation into electron-hole pairs.