侧链结构对PPV/C_(60)组合体系的激发传递和电荷转移过程的影响

本文考察不同的侧链长度对聚对苯乙炔 (PPV)衍生物的光学性质等的影响 ,以及PPV/C60 的组合薄膜中的激发传递和电荷转移过程。结果表明随着连接在PPV的侧链长度的增长 ,其π π 跃迁带隙变窄 ,使得吸收和发射峰的位置逐渐红移 ;同时观测到PPV/C60 间存在着极有效的激发传递过程 ,从而使得PPV衍生物的荧光在很大程度上被C60 分子所猝灭 ;MD PPV/C60 组合膜中观测到了C-60 的吸收峰 ,这表明该体系存在着基态电荷转移过程 ,同时也表明PPV衍生物与C60 分子间的相互作用和PPV的侧链长短密切相关。

The Effect of Side Chain Structure on the Excitation Transfer and Charge Transfer Processes in PPV/C_( 60) Composite System

In this paper,we investigated the effect of side chains on the optical properties of PPV derivatives,the excitation transfer and charge transfer process in the PPV/C 60 composite films.The results demonstrate that the absorption and PL emission bands of PPV shift towards lower photon energy with increasing of the length of PPV side chain,which indicates that energy gap of PPV derivatives become narrow with their side chain length increasing.In the PPV/C 60 composite films,the emission of PPV derivatives was greatly quenched due to the efficient excitation transfer process between PPV and C 60 .We observed the absorption band of C - 60 located at 920 nm in the MD PPV/C 60 composite films,which reveals the existence of charge transfer process in the ground state of the composite films.This results show that the side chains of PPV derivatives not only influence the properties of absorbance and photoluminescence but also influence the electronic affinity of PPV polymers,which measns that both physical and chemical properties of PPV can be monitored by controlling its side chain structure.