Biomaterial Database

Constructing Chiral Covalent-Organic Frameworks for Circularly Polarized Light Detection. 2024

Qianfeng Gu, and Jiajia Zha, and Cailing Chen, and Xin Wang, and Wenyan Yao, and Jiahe Liu, and Fangyuan Kang, and Jinglun Yang, and Yang Yang Li, and Dangyuan Lei, and Zhiyong Tang, and Yu Han, and Chaoliang Tan, and Qichun Zhang

Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong, SAR, 999077, P. R. China.

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.