Optoelectronics Research Centre, School of Science, Minzu University of China, Beijing 100081, China.
Engineering Research Centre of Photonic Design Software, Ministry of Education, Beijing 100081, China.
Molecules. 2023 Jan 4;28(2):488. doi: 10.3390/molecules28020488.
A series of novel chromophores A, B, C, and D, based on the julolidinyl donor and the tricyanofuran (TCF) and CF-tricyanofuran (CF-Ph-TCF) acceptors, have been synthesized and systematically investigated. The -bis(trifluoromethyl)benzene derivative isolation group was introduced into the bridge in the chromophores C and D. These nonlinear optical chromophores showed good thermal stability, and their decomposition temperatures were all above 220 °C. Density functional theory (DFT) was used to calculate the energy gaps and first-order hyperpolarizability (β). The macroscopic electro-optic (EO) activity was measured using a simple reflection method. The highest EO coefficient of poled films containing 35 wt% of chromophore D doped in amorphous polycarbonate afforded values of 54 pm/V at 1310 nm. The results indicate that the -bis(trifluoromethyl)benzene isolation group can suppress the dipole-dipole interaction of chromophores. The moderate r33 value, good thermal stability, and good yield of chromophores suggest their potential use in the nonlinear optical area.
一系列新型发色团 A、B、C 和 D，基于 julolidinyl 给体和三氰呋喃（TCF）和 CF-三氰呋喃（CF-Ph-TCF）受体，已被合成并进行了系统研究。发色团 C 和 D 中的桥接处引入了 -双（三氟甲基）苯衍生物分离基团。这些非线性光学发色团表现出良好的热稳定性，其分解温度均高于 220°C。密度泛函理论（DFT）用于计算能隙和一阶超极化率（β）。使用简单的反射法测量宏观电光（EO）活性。在掺有 35wt%掺杂在非晶聚碳酸酯中的发色团 D 的极化膜中，在 1310nm 处获得了 54pm/V 的最高 EO 系数。结果表明，-双（三氟甲基）苯隔离基团可以抑制发色团的偶极-偶极相互作用。适中的 r33 值、良好的热稳定性和较高的产率表明它们在非线性光学领域具有潜在的应用价值。
