Back Cover: Covalent Organic Framework for Improving Near‐Infrared Light Induced Fluorescence Imaging through Two‐Photon Induction (Angew. Chem. Int. Ed. 25/2020)

A benzothiadiazole-based covalent organic framework (COF) with efficient two-photon induction performance was synthesized as described by X.-Z. Zhang and co-workers in their Research Article on page 10087. The unique structure of the COF attenuates π–π stacking interactions between the layers, and overcomes aggregation-caused emission quenching of chromophores for improved near-infrared two-photon-induced fluorescence imaging.