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Molecular design and synthesis of branched bichromophore-attached linear fluorinated polyimides for nonlinear optical applications |
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| Authors: | Man He Yuming Zhou Yafeng Gao Yongjuan Wang Xiaohai Bu Tao Zhang Yiping Cui Tong Zhang |
| Affiliation: | 1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, China 2. Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing, 211189, China 3. Department of Electronic Engineering, Southeast University, Nanjing, 210096, China |
| Abstract: | A branched structure bichromophore was developed to increase the nonlinearity of optical polymers. The branched bichromophore was incorporated into the polymer backbone to prepare a novel nonlinear optical (NLO) side-chain fluorinated polyimide with high optical nonlinearity and good thermal stability. The novel nonlinear optical side-chain fluorinated polyimide exhibits a large electro-optic (E-O) coefficient (γ33) (34 pm/V at 1550 nm) which is larger than that of the conventional side-chain optical polyimide. This is mainly attributable to an increased chromophore concentration and high polarizing efficiency derived from the branched structure. The branched structure of the bichromophore is incorporated into a polymer backbone to result in a high chromophore concentration. Moreover, the three-dimensional (3D) architecture and large molecular size of the branched bichromophore can spatially shield from strong interchromophore electrostatic interactions to enhance the poling efficiency. The side-chain fluorinated polyimide exhibits excellent solubility in common organic solvents, good film-forming property, high glass-transition temperature (T g) (190 °C) and thermal stability up to 235 °C. |
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