Aqueous/Chemical‐Resistant Organic Room Temperature Phosphorescence Materials From Siloxane Network Reinforcement

Abstract Organic room‐temperature phosphorescent(RTP) materials typically exhibit superior luminescent properties, yet their instability, particularly in aqueous environments where phosphorescence is quenched, and under acidic, alkaline, or organic solvent conditions, restricts their application. Herein, a novel and convenient strategy is designed for constructing host–guest organic RTP materials by incorporating silane into urea‐derived products to form a siloxane network‐strengthened stable host matrix. The siloxane possesses excellent chemical stability and can be combined with the thermolytic products of urea through covalent bonds, enhancing the chemical resistance of the host. The host connects with the guest molecules through covalent bonds and hydrogen bonds, restricting non‐radiative loss, enhancing phosphorescent emission, and protecting the guest molecules from quenching in multiple chemical environments. The host–guest RTP material, prepared using (3‐aminopropyl) triethoxysilane, urea, and 2‐aminoterephthalic acid, exhibits blue phosphorescence with a lifetime of 891 ms, visible to the naked eye for 21 s. Notably, it maintains phosphorescent emission in water, organic solvents, and strong acid/alkali solutions while demonstrating excellent stability, as evidenced by its potential applications in afterglow displays and information encryption. This strategy provides valuable insights for designing stable RTP materials and broadens their potential application in complex environments.