Phenothiazine-based donor–acceptor covalent–organic frameworks with keto–enol irreversible tautomerism as a promising third-order nonlinear optics material

Abstract

Covalent-organic frameworks (COFs) exhibit high structural designability and functional tunability, and have become a promising platform for designing excellent third-order nonlinear optical (NLO) candidate materials. However, their third-order NLO performance...

Towards high-performance nonlinear optical materials through embedding a D–A system into β-ketoenamine-linked COFs

“…Furthermore, the presence of the electron-withdrawing CO groups in the keto form facilitates the charge transfer process and narrows the bandgap, further enhancing the third-order NLO performance. 26…”