Organic cocrystals exhibiting active optical waveguide behaviors are strongly related to the total internal reflection, molecule stacking modes, and the spatial distribution of transition dipole moment (µ) in crystals. However, organic charge transfer (CT) cocrystals as new materials that exhibit optical waveguide property responses to anisotropic spatial distribution of µ are still unknown. Herein, prepared is a novel organic CT cocrystal 9AC‐TCNB (9AC = 9‐anthracene carboxylic acid, TCNB = 1,2,4,5‐tetracyanobenzene) with a mixed stacking structure of donor (D) and acceptor (A) along two different orientations on the same lattice plane. According to various spectroscopic analyses, two direction‐oriented asymmetric light propagate in the cocrystal derived from the anisotropic spatial distribution of µ have been confirmed. Photoluminescence (PL) microscopic images and spatial resolution PL spectra of 1D and 2D 9AC‐TCNB cocrystals further demonstrate that the CT cocrystals possess morphology and color‐dependent optical waveguide properties with anisotropy, which confirms the principle theory of light propagation. This result can open new potential applications of organic cocrystals in large‐scale optical waveguide devices and integrated optics.

中文翻译：

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过渡偶极矩各向异性空间分布的大尺寸有机电荷转移共晶体的形貌相关发光和光波导特性

表现出有源光波导行为的有机共晶体与全内反射，分子堆叠模式以及晶体中跃迁偶极矩（µ）的空间分布密切相关。然而，作为新材料的有机电荷转移（CT）共晶体表现出对μ各向异性空间分布的光波导特性响应仍然未知。本文制备了一种新型的有机CT共晶体9AC-TCNB（9AC = 9-蒽羧酸，TCNB = 1,2,4,5-四氰基苯），它具有两个供体（D）和受体（A）的混合堆叠结构同一晶格平面上的不同方向。根据各种光谱分析，从μ的各向异性空间分布得出的共晶中有两个方向不对称的光在共晶体中传播。已经确认。1D和2D 9AC-TCNB共晶体的光致发光（PL）显微图像和空间分辨率PL光谱进一步证明，CT共晶体具有形态学和与颜色有关的具有各向异性的光波导特性，这证实了光传播的原理。这一结果可以为有机共晶体在大规模光波导器件和集成光学中的潜在应用开辟新的途径。