Ma G, Guo L, Qian S, Wang R, Mo Y
Physics Department, Fudan University, 200433 Shanghai.
Guang Pu Xue Yu Guang Pu Fen Xi. 2001 Aug;21(4):420-3.
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/C60 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/C60 composite films, the emission of PPV derivatives was greatly quenched due to the efficient excitation transfer process between PPV and C60. We observed the absorption band of C60- located at 920 nm in the MD-PPV/C60 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 means that both physical and chemical properties of PPV can be monitored by controlling its side chain structure.
在本文中，我们研究了侧链对聚对苯撑乙烯（PPV）衍生物光学性质的影响，以及PPV/C60复合薄膜中的激发转移和电荷转移过程。结果表明，随着PPV侧链长度的增加，PPV的吸收带和光致发光（PL）发射带向较低光子能量方向移动，这表明PPV衍生物的能隙随着其侧链长度的增加而变窄。在PPV/C60复合薄膜中，由于PPV和C60之间有效的激发转移过程，PPV衍生物的发射被大大猝灭。我们在MD-PPV/C60复合薄膜中观察到位于920nm处的C60吸收带，这揭示了复合薄膜基态中电荷转移过程的存在。这些结果表明，PPV衍生物的侧链不仅影响吸光度和光致发光性质，还影响PPV聚合物的电子亲和性，这意味着可以通过控制其侧链结构来监测PPV的物理和化学性质。
