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采用吸收光谱、荧光光谱和皮秒Z-扫描等实验方法研究了侧链长度的不同对聚[2-甲氧基-5-(2′-乙基-己氧基)]对苯乙炔(MEH-PPV)和聚(2,5-二辛氧基)对苯乙炔(DO-PPV)两种聚对苯乙炔(PPV)衍生物光学性质的影响,并用π-电子共轭结构理论和共振、非共振增强理论进行了分析。结果表明,侧链较长的MEH-PPV的吸收峰和荧光发射峰比DO-PPV相应的吸收和荧光峰均有所红移;侧链结构及共振增强使得MEH-PPV的三阶非线性极化率比DO-PPV增强了近两个量级,并在532 nm激发时,χ(3)具有最大值9.30×10-10esu。
The effects of different side chain length on the degradation of poly [2-methoxy-5- (2’-ethyl-hexyloxy)] p- -PPV and poly (2,5-dioctyloxy) -p-phenylenevinylene (DO-PPV) were investigated. The optical properties of two poly (p-phenylenevinylene) Nonresonance enhancement theory is analyzed. The results showed that the absorption peak and fluorescence peak of MEH-PPV with longer side chains than those of DO-PPV all showed red shifts. The side chain structure and resonance enhancement made the third-order nonlinear polarities of MEH-PPV Compared with DO-PPV, the enhancement rate is nearly two orders of magnitude, and at excitation of 532 nm, χ (3) has the maximum of 9.30 × 10-10 esu.