苯环取代聚乙炔是一类具有简并基态的发光聚合物 .利用扩展的Su Schrieffer Heeger模型 ,研究了这类聚合物链中的孤子、极化子等元激发特性 .结果表明 :由于苯环与聚乙炔主链间的强π 电子耦合 ,苯环取代抑制了聚乙炔主链的二聚化 ,减小了导带与价带之间的能隙 ;因此取代聚乙炔中的元激发具有较小的激发能 ,同时具有更大的相干长度 .尽管苯基取代对元激发有很大的影响 ,但是非取代聚乙炔中元激发的基本物理规律依然成立 ,表明这些元激发的基本特性不受取代基团的影响 Benzene ring-substituted polyacetylene is a kind of luminescent polymer with degenerate ground state.Using the extended Su Schrieffer Heeger model, the elemental excitation properties of soliton and polaron in this polymer chain are studied.The results show that due to the benzene ring With the strong π electron coupling between polyacetylene main chains, benzene ring substitution inhibits the dimerization of polyacetylene main chain and reduces the energy gap between conduction band and valence band. Therefore, replacing meta-acetylene in meta-excitation Small excitation energy and larger coherence length.Although the phenyl substitution has a great influence on the elemental excitation, the basic physics of non-substituted polyacetylene meta-excitation still holds, indicating that the basic characteristics of these elemental excitation are not affected The impact of generation groups