中文摘要：

采用原位脱氯化氢缩合聚合法制备了聚（2-甲氧基-5-辛氧基）对苯乙炔/氧化铽（PMOCOPV/Tb4O7）纳米复合材料.红外光谱证实了在Tb4O7表面的包覆层为PMOCOPV.紫外-可见吸收光谱表明随着Tb4O7含量增加,PMOCOPV/Tb4O7的最大吸收峰发生红移且强度提高.荧光光谱研究表明随着Tb4O7含量增加,PMOCOPV/Tb4O7的最大发射波长发生蓝移且强度提高,荧光寿命得到增强,Tb4O7与PMOCOPV之间形成了光致电子转移体系,使得π电子离域程度增加,并且导致荧光量子效率提高.根据Eg与入射光子能量hν的关系,拟合了PMOCOPV/Tb4O7薄膜的光学禁带宽度,发现随着Tb4O7含量增加,Eg减小.采用简并四波混频方法测试它们的三阶非线性极化率χ（3）,结果发现随着Tb4O7含量增加,PMOCOPV/Tb4O7纳米复合体的非线性光学响应逐渐增强,这说明PMOCOPV与Tb4O7之间形成了分子间光致电子转移体系,产生了复杂的分子间离域π电子非线性运动.

英文摘要：

The photoelectric nanocomposites of poly（2-methoxy-5-octyloxy）-p-phenylene vinylene/Tb4O7 （PMOCOPV/Tb4O7） were prepared by dehydrochlorination in situ polymerization.The result of Fourier transform infrared spectroscopy indicates that PMOCOPV is coated on the surface of Tb4O7.The absorption of PMOCOPV/Tb4O7 is strengthened with the contents of Tb4O7 increasing,and a red shift of the absorption peak can be clearly observed in the UV-Vis spectrum.Photoluminescence spectroscopy indicates that the maximum emission wavelength of the PMOCOPV/Tb4O7 is blue-shifted and intensity of photoluminescence increases with increasing Tb4O7 concentration.PMOCOPV/Tb4O7 shows fluorescence increasing,which involved the inter-molecular photo-induced charge transfer process.The optical band gap of PMOCOPV/Tb4O7 decreases gradually with the contents of Tb4O7 increasing.Third-order optical nonlinear susceptibility of PMOCOPV/Tb4O7 nanocomposites was measured by degenerate four wave mixing.The results show that the third-order nonlinear optical responses of PMOCOPV/Tb4O7 nanocomposites are enhanced gradually when Tb4O7 content increased,which can be attributed to inter-molecular photo-induced electron transfer and delocalized π electron coupling between PMOCOPV and Tb4O7.