Towards high-performance nonlinear optical materials through embedding a D–A system into β-ketoenamine-linked COFs
Literature Information
Mingyan Li, Jiahui Chu, Debo Ding, Tingting Li, Endian Su, Yinglin Song, Yun-Fang Yang, Yuanbin She, Jianhong Jia
Two covalent organic framework (COF) films supported by a glass substrate were obtained by solvothermal reaction of an electron donor with electron acceptor 1,3,5-triformylbenzene (TF) or 2,4,6-triformylphloroglucinol (TFP), respectively. The TFP-BD film exhibits a nonlinear absorption coefficient of −3.01 × 105 cm GW−1. The TFP-BD film can aggregate electrons around the connected monomer through the D–A effect due to its highly polar and electronegative carbonyl oxygen atoms, thereby modulating the electronic structure of the COFs. This work provides a novel approach for the structural modulation of optical materials with strong nonlinearity.
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