Department of Chemistry, Hubei Key Laboratory of Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, China.
Chem Asian J. 2013 Aug;8(8):1836-46. doi: 10.1002/asia.201300010. Epub 2013 Mar 25.
For the first time, a series of second-order NLO poly(arylene-ethynylene)s, in which an isolation chromophore was introduced to enhance the NLO coefficients, were successfully designed and synthesized. Thanks to the isolation chromophore, these polymers demonstrated good NLO activities and optical transparency. To further improve the comprehensive performance of the polymers, different isolation groups of various sizes were introduced to subtly modify the structure of the polymers according to the "suitable isolation group" concept. The naphthalene (Np) group was found to be a "suitable isolation group" in this series of polymers and polymer P3 demonstrated the highest d33 value (122.1 pm V(-1)) of these five polymers. Interestingly, polymer P5, which contained a pentafluorophenyl ring as an isolation group, exhibited a much higher NLO effect and stability than polymer P2, which just contained normal phenyl rings as isolation groups (97.2 versus 62.5 pm V(-1)), thus indicating the advantages of the Ar-Ar(F) self-assembly effect in the field of non-linear optics.
首次设计并合成了一系列二阶 NLO 聚（苯乙炔），其中引入了隔离发色团以增强 NLO 系数。由于隔离发色团的存在，这些聚合物表现出良好的 NLO 活性和光学透明性。为了进一步提高聚合物的综合性能，根据“合适的隔离基团”概念，引入了不同大小的不同隔离基团，以巧妙地修饰聚合物的结构。在这一系列聚合物中，发现萘（Np）基团是一种“合适的隔离基团”，聚合物 P3 表现出这五个聚合物中最高的 d33 值（122.1 pm V-1）。有趣的是，含有五氟苯基环作为隔离基团的聚合物 P5 表现出比仅含有正常苯基环作为隔离基团的聚合物 P2 更高的 NLO 效应和稳定性（97.2 对 62.5 pm V-1），这表明在非线性光学领域中，Ar-Ar（F）自组装效应具有优势。
