Design and synthesis of novel H-Shaped chromophore for enhanced nonlinear optical properties
Design and synthesis of novel H-Shaped chromophore for enhanced nonlinear optical properties
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设计和合成新型 H 形发色团以增强非线性光学性能
DOI：
10.1016/j.dyepig.2019.02.022
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发表时间：
2019
影响因子：
4.5
通讯作者：
Wang Jiahai
中科院分区：
文献类型：
--
作者：
Xu Huajun;Liu Fenggang;Chen Shujie;Shi Wenjing;Xie Zhipeng;Wang Jianwu;Zhai Zhaofen;Liu Jianpeng;Li Han;Wang Jiahai
通过威廉姆森醚化反应，设计合成了一种新型的以久洛尼烷基为给体的H型非线性光学生色团B。发色团B由两个传统的棒状发色团A组成，它们通过隔离基团彼此连接，通过空间相互作用迫使发色团分离。发色团B具有良好的热稳定性和成膜能力。此外，分子间静电相互作用的减少允许在主体-客体掺杂材料的制剂中增加活性发色团数密度，从而增强电光响应。掺杂有35wt%发色团B的聚合物已被极化以提供在1310 nm处为180 pm/V的大电光系数（r33），这比在25wt%掺杂浓度下从发色团A获得的电光系数（92 pm/V）高近两倍。这些结果表明，H型发色团B在将微观超极化率转化为宏观电光系数方面优于棒状发色团A。
A novel H-shaped nonlinear optical chromophore B based on julolidinyl donors were designed and synthesized through Williamson ether reaction. The chromophore B is composed of two traditional rod-shaped chromophores A linked to each other through an isolation group, forcing chromophore separation through steric interaction. Chromophore B showed good thermal stability and film-forming ability. Besides, the reduction of intermolecular electrostatic interactions allows for increased active chromophore number density in the formulation of a host-guest doping material, thus enhancing electro-optic response. Polymers doped with 35 wt% chromophore B have been poled to afford large electro-optic coefficient (r33) of 180 pm/V at 1310 nm, which is nearly two times higher than that obtained from the chromophore A (92 pm/V) at the doping concentration of 25 wt%. These results indicated that the H-shaped chromophore B has the advantages over rod-shaped chromophore A in transforming the microscopic hyperpolarizability into a macroscopic electro-optic coefficient.