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/Y2O3:Eu3+(PMOCOPV/Y2O3:Eu3+)纳米复合材料。 红外光谱证实了在Y2O3:Eu3+表面的包覆层为PMOCOPV。 紫外-可见吸收光谱表明与PMOCOPV相比,PMOCOPV/Y2O3:Eu3+的最大吸收峰发生红移且强度提高。 荧光光谱研究表明PMOCOPV/Y2O3:Eu3+的最大发射波长发生红移且强度提高,荧光寿命得到增强,Y2O3:Eu3+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/Y2O3:Eu3+薄膜的光学禁带宽度,发现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),结果发现与PMOCOPV相比,PMOCOPV/Y2O3:Eu3+纳米复合体的非线性光学响应逐渐增强,进一步说明PMOCOPV与Y2O3:Eu3+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。

The photoelectric nano-composites of poly(2-methoxy-5-octyloxy)-p-phenylene vinylene/Y2O3:Eu3+ (PMOCOPV/Y2O3:Eu3+) were prepared by dehydrochlorination in-situ polymerization. The result of Fourier transform infrared spectroscopy indicates that PMOCOPV is coated on the surface of Y2O3:Eu3+. Compared with PMOCOPV,the absorption of PMOCOPV/Y2O3:Eu3+ is strengthened,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/Y2O3:Eu3+ is red-shifted and the intensity of photoluminescence increases in comparison with PMOCOPV. PMOCOPV/Y2O3:Eu3+ shows fluorescence increasing,which involved the inter-molecular photo-induced charge transfer process. The optical band gap of PMOCOPV/Y2O3:Eu3+ decreases. The third-order optical nonlinear susceptibility of PMOCOPV/Y2O3:Eu3+ nano-composites was measured by degenerate four wave mixing. The results show that the third-order nonlinear optical responses of PMOCOPV/Y2O3:Eu3+ nano-composites are enhanced in comparison with PMOCOPV,which can be attributed to inter-molecular photo-induced electron transfer and delocalized π electron coupling between PMOCOPV and Y2O3:Eu3+.