Photoluminescence of self-organized perylene bisimide polymers

摘要

Three polymers consisting of alternating perylene bisimide chromophores and flexible polytetrahydrofuran segments of different length have been studied using absorption and (time-resolved) photoluminescence spectroscopy. In o-dichlorobenzene, the chromophores self organize to form H-like aggregates. The photoluminescence spectra of the self-organized polymers consist of vibronically resolved monomeric perylene bisimde fluorescence (lambda(max) = 538 nm, tau = 3.9 ns) and unstructured excimer-type emission (lambda(max) = 635 nm, tau = 17 ns). An additional short-lived (tau = 2 ns) luminescence component is observed and ascribed to the dynamic deactivation of the monomeric photoexcited state via excimer formation or energy transfer.