Gu Qianfeng, Zha Jiajia, Chen Cailing, Wang Xin, Yao Wenyan, Liu Jiahe, Kang Fangyuan, Yang Jinglun, Li Yang Yang, Lei Dangyuan, Tang Zhiyong, Han Yu, Tan Chaoliang, Zhang Qichun
Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong, SAR, 999077, P. R. China.
Advanced Membranes and Porous Materials (AMPM) Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Adv Mater. 2024 Apr;36(17):e2306414. doi: 10.1002/adma.202306414. Epub 2023 Sep 22.
The use of chiral covalent organic frameworks (COFs) as active elements in photodetectors to directly identify circularly polarized light (CPL) can meet the requirement of integration and miniaturization of the as-fabricated devices. Herein, the design and synthesis of two isoreticular chiral two-dimensional (2D) COFs (CityU-7 and CityU-8) by introducing photosensitive porphyrin-based amines (5,10,15,20-tetrakis(4-aminophenyl)porphyrin) to enhance the optical absorption and chiral aldehyde linkage (2,5-bis((S/R))-2-methylbutoxy)terephthalaldehyde) to engender chirality for direct CPL detection are reported. Their crystalline structures were confirmed by powder X-ray diffraction, Fourier-transform infrared spectroscopy, and low-dose transition electron microscopy. Employing both chiral COFs as the active layers in photodetectors, left-handed circularly (LHC) and right-handed circularly (RHC) polarized light at 405 nm can be well distinguishable with short response time, high responsivity, and satisfying detectivity. The study provides the first example on the design and synthesis of chiral COFs for direct detection of CPL.
使用手性共价有机框架（COF）作为光电探测器中的活性元件来直接识别圆偏振光（CPL），可以满足所制备器件的集成化和小型化要求。在此，报道了通过引入光敏卟啉基胺（5,10,15,20-四（4-氨基苯基）卟啉）以增强光吸收，以及手性醛连接体（2,5-双（（S/R））-2-甲基丁氧基）对苯二甲醛）以产生手性用于直接CPL检测，设计并合成了两种同网的手性二维（2D）COF（CityU-7和CityU-8）。通过粉末X射线衍射、傅里叶变换红外光谱和低剂量透射电子显微镜确认了它们的晶体结构。将这两种手性COF都用作光电探测器的活性层，在405nm处的左旋圆偏振（LHC）光和右旋圆偏振（RHC）光可以通过短响应时间、高响应度和令人满意的探测率得到很好的区分。该研究为直接检测CPL的手性COF的设计和合成提供了首个实例。
