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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.
Poly (2-methoxy-5-octyloxy) p-phenylacetylene / terbium oxide (PMOCOPV / Tb4O7) nanocomposites were prepared by in-situ dehydrochlorination condensation polymerization.The infrared spectrum confirmed the coating on the surface of Tb4O7 The results showed that the maximum absorption peak of PMOCOPV / Tb4O7 was redshifted and its intensity increased with the increase of Tb4O7 content.The fluorescence spectra showed that the maximum emission wavelength of PMOCOPV / Tb4O7 was blue-shifted with the increase of Tb4O7 content Intensity and fluorescence lifetime were enhanced, and a photo-induced electron transfer system was formed between Tb4O7 and PMOCOPV, which led to the increase of π-electron delocalization and the increase of fluorescence quantum efficiency.According to the relationship between Eg and incident photon energy hν, PMOCOPV / Tb4O7 thin film and found that Eg decreases with increasing Tb4O7 content.The third-order nonlinear polarizability χ (3) is measured by degenerate four-wave mixing method and found that as Tb4O7 content increases , The nonlinear optical response of the PMOCOPV / Tb4O7 nanocomposites gradually increased, which indicates that the intermolecular photoelectron transfer system formed between PMOCOPV and Tb4O7, resulting in the complex intermolecular π-electron delocalization .