Three push-pull chromophores comprising a triphenylamine (TPA) as electron-donating moiety and functionalized β-diketones as electron acceptor units are studied by various spectroscopic techniques. The time-correlated single-photon counting data shows that increasing the number of electron acceptor units accelerates photoluminescence relaxation rate of compounds. Transient spectra data shows that intramolecular charge transfer (ICT) takes place from TPA units to β-diketones units after photo-excitation. Increasing the number of electron acceptor units would prolong the generation process of ICT state, and accelerate the excited molecule reorganization process and the relaxation process of ICT state.

通过各种光谱技术研究了三种包含三苯胺（TPA）作为供电子部分和功能化的β-二酮作为电子受体单元的推挽发色团。时间相关的单光子计数数据表明，增加电子受体单元的数量会加快化合物的光致发光弛豫速率。瞬态光谱数据表明，光激发后，分子内电荷转移（ICT）从TPA单元转移到β-二酮单元。电子受体单元数目的增加将延长ICT状态的产生过程，并加速激发态分子的重组过程和ICT状态的弛豫过程。