Multifunctional Covalent Organic Framework Coupled with Sc 3+ -Sensitized Emission for Ratiometric Detection of Enrofloxacin

on enrofloxacin (ENR). The resulting system enhances sensing performance in water, exhibiting a linear fluorescence response to enrofloxacin with a detection limit of 5.96 nM. Notably, the fluorescence color changes from orange to purple during detection, and a modular color recognition device was further developed for portable, rapid, and real-time quantification of ENR. Overall, this study offers a novel strategy for the synergistic integration of rare-earth ions and COF materials in optical sensing applications.