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Facile bromine-termination of nonlinear optical chromophore: remarkable optimization in photophysical properties, surface morphology and electro-optic activity

机译：非线性光学色团的容易溴终端：光物理性质，表面形态和电光活性的显着优化

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摘要

This paper describes how a small molecular structure modification can enhance the microscopic and macroscopic properties of chromophore. A new chromophore WJ10 is synthesized by applying bromine-termination to the remote donor of WJ6, an existing donor-pi-acceptor chromophore. This small molecular change can significantly enhance the photophysical properties of chromophore and generate intriguing inverted solvatochromism in solutions. The absorption intensity of chromophore WJ10 in a guest-host electro-optic polymer film is 40-50% higher than that of the chromophore WJ6, which results in the increase of microscopic first-order hyperpolarizability of WJ10 in guest-host electro-optic (EO) polymer film. DFT calculations was carried out to explain this intriguing photophysical property in both solutions and in films. Bromine-termination also has the influence on macroscopic surface morphology of WJ10 in EO films, making WJ10 more homogeneously dispersed than WJ6. In EO activities, EO coefficient obtained with the WJ10 film is more than two times larger (211 pm V-1) than benchmark value 104 pm V-1 obtained from WJ6. The enhanced electro-optic activity with WJ10 is due to the enhancement of the microscopic hyperpolarizability and the better chromophore alignment in the poling process. This study demonstrates the structure-property relationship in bromine-termination of nonlinear optical chromophore, which can be further explored for the synthesis of new organic EO materials.
机译：本文介绍了小分子结构改性如何增强发色团的微观和宏观性质。通过将溴终端施加到WJ6的遥控器，现有的供体 - PI-Conceiveor发色团来合成新的发色团WJ10。这种小分子变化可以显着提高发色团的光物理性质，并在溶液中产生有趣的倒溶色体变性。在客体 - 宿主电光聚合物膜中发色团WJ10的吸收强度高于发色团WJ6的40-50％，这导致GJ10在客户端 - 主机电光中的微观一阶超极化性增加（ EO）聚合物薄膜。进行DFT计算以解释溶液和薄膜中的这种有趣的光学性质。溴终止也对EO膜中WJ10的宏观表面形态的影响产生影响，使WJ10更加均匀地分散而不是WJ6。在EO活性中，用WJ10薄膜获得的EO系数比从WJ6获得的基准值104 PM V-1更大（211pmV-1）超过两倍以上具有WJ10的增强的电光活性是由于抛光过程中的微观超极化性和更好的发色团对准的增强。该研究表明，非线性光学色团溴终端中的结构性质关系，可以进一步探索新的有机EO材料的合成。

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  • 来源
    《RSC Advances》 |2015年第123期|共7页
  • 作者

    Wu Jieyun; Bo Shuhui; Wang Wen; Deng Guowei; Zhen Zhen; Liu Xinhou; Chiang Kin-Seng;

  • 作者单位

    Univ Elect Sci &

    Technol China Sch Commun &

    Informat Engn Chengdu 610054 Peoples R China;

    Chinese Acad Sci Tech Inst Phys &

    Chem Beijing Peoples R China;

    Univ Elect Sci &

    Technol China Sch Commun &

    Informat Engn Chengdu 610054 Peoples R China;

    Chengdu Normal Univ Coll Chem &

    Life Sci Chengdu Peoples R China;

    Chinese Acad Sci Tech Inst Phys &

    Chem Beijing Peoples R China;

    Chinese Acad Sci Tech Inst Phys &

    Chem Beijing Peoples R China;

    Univ Elect Sci &

    Technol China Sch Commun &

    Informat Engn Chengdu 610054 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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