A Real‐Time Display Screen Based on Organohydrogel with Tunable Fluorescence

Abstract In this study, a multi‐monomer organohydrogel network is fabricated based on radical polymerization. Acrylic acid (AA) and dimethylaminoethyl methacrylate (DMAEMA) are used as hydrophilic monomers, and methoxyethyl acrylate (MEA) serves as a hydrophobic monomer. To endow the organohydrogel with a photo‐responsive property, a fluorescent monomer, 1′‐acryloyl chloride‐3′,3′‐dimethyl‐6‐nitrospiropyran (SPMA) is added. Under ultraviolet (UV) and visible light irradiation, SPMA undergoes ring‐opening and ring‐closing isomerization reactions, respectively. This leads to enhanced and reduced fluorescence. This fluorescence tunability allows for the local regulation of fluorescence in the organohydrogel using a photomask. By employing UV and visible light, complex information can be repeatedly written and erased on the organohydrogel. Additionally, based on the interactions between dimethyl sulfoxide (DMSO) and water within the system, the organohydrogel exhibits excellent anti‐freezing and water‐holding properties, allowing its use in low‐temperature environments and extended preservation time. The organohydrogel has precise information writing capabilities and is more difficult to falsify as an information encryption platform. This study provides guidance for future researchers to develop information writing capabilities with higher precision and broader applications in various environments using smart materials.