Further Enhancement of the Second-Order Nonlinear Optical (NLO) Coefficient and the Stability of NLO Polymers that Contain Isolation Chromophore Moieties by Using the “Suitable Isolation Group” Concept and the Ar/ArF Self-Assembly Effect

Authors

  • Wenbo Wu,

    1. Department of Chemistry, Hubei Key Laboratory of Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (China), Fax: (+86) 27-68756757
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  • Prof. Cheng Ye,

    1. Organic Solids Laboratories, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080 (China)
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  • Prof. Jingui Qin,

    1. Department of Chemistry, Hubei Key Laboratory of Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (China), Fax: (+86) 27-68756757
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  • Prof. Zhen Li

    Corresponding author
    1. Department of Chemistry, Hubei Key Laboratory of Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (China), Fax: (+86) 27-68756757
    • Department of Chemistry, Hubei Key Laboratory of Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072 (China), Fax: (+86) 27-68756757

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Abstract

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 demonstrated the highest d33 value (122.1 pm V−1) of these five polymers. Interestingly, polymer , which contained a pentafluorophenyl ring as an isolation group, exhibited a much higher NLO effect and stability than polymer , which just contained normal phenyl rings as isolation groups (97.2 versus 62.5 pm V−1), thus indicating the advantages of the Ar[BOND]ArF self-assembly effect in the field of non-linear optics.

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