Abstract
Abstract Electric field effects on photochemical dynamics have been examined with particular regard to photoinduced electron transfer (PIET) and excimer formation, based on the measurements of the field effects on emission spectra and emission decays. In various pairs of electron donor and acceptor and in their linked compounds, the following processes are shown to be significantly influenced by an electric field in a polymer film: the initial step of PIET, back-electron transfer which produces an fluorescent state, charge recombination, and dissociation of radical–ion pairs generated by PIET. With an oriented molecular system where vectorial interlayer PIET occurs, PIET is shown to be controlled by an electric field; the rate is depressed or enhanced by an electric field, depending on the field direction relative to the direction of the electron transfer. Electric field effects on excimer formation processes suggest that not only the level shift but also the change in orbital overlap between different chromophores play an significant role in electric field effects on photochemical dynamics.
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