Influence of electronic acceptor on the excited state properties of push-pull chromophores

Two push-pull compounds, which are comprised of triphenylamine (TPA) (electron donor units) and functionalized beta-diketones difluorboron complexes (electron acceptor units) are probed by many spectroscopies, which offers the relationship between electron acceptor and the intrinsic excited state properties of push-pull chromophores. We found that the photoluminescence (PL) intensity would enhance with the number of electron acceptor. Transient absorption (TA) data shows that intramolecular charge transfer (ICT) process really exists in the two molecules after photoexcitation and this process would be prolonged through increasing the electron-acceptor, which would be responsible for the improvement of PL property. (C) 2017 Elsevier B.V. All rights reserved.