PPV衍生物的激发态动力学特性研究

Investigations of Excited State Dynamics of a PPV Derivative Using Ultrafast Kerr Spectroscopy

利用共振飞秒光学克尔效应研究了C1 0 PPV溶液的非线性光学响应。实验结果表明 ,在共振激发条件下 ,C1 0 PPV的光学克尔效应信号表现为快速上升和随后的弛豫过程 ,其弛豫过程由两部分组成 ,一个 2 0 0fs的快过程和一个 4 0 0 ps的慢过程。通过比较C1 0 PPV和掺杂C6 0 后的C1 0 PPV荧光光谱 ,4 0 0 ps的慢过程可归属为聚合物链内单重态激子在不同共轭段间的迁移过程。

Nonlinear optical response of C 10 PPV solution was investigated by using the resonant femtosecond optical Kerr effect (OKE) method. The experimental results revealed that the OKE signal showed an ultrafast rising followed by a fast and a slow relaxation process with time constant of 200 fs and 400 ps, respectively. By analysing the photoluminescence spectra of C 10 PPV and C 10 PPV doped with C 60 , it is suggested that the 400 ps slow component can be assigned to the singlet exciton migration among different conjugated segments inside polymer.