Ln‐MOF‐Based Hydrogel Films with Tunable Luminescence and Afterglow Behavior for Visual Detection of Ofloxacin and Anti‐Counterfeiting Applications

Abstract

Highly selective and sensitive quantitative detection of ofloxacin (OFX) at ultra‐low concentrations in aqueous media and development of new afterglow materials remains a challenge. Herein, a new 2D water‐stable lanthanide metal‐organic framework (NIIC‐2‐Tb) is proposed, which exhibits high selectivity towards OFX through the luminescence quenching with the lowest detection limit (1.1 nM) reported to date and a fast response within 6 s. In addition, the luminescence detection of OFX by NIIC‐2‐Tb was not affected by typical components of blood plasma and urine. The excellent sensing effect of NIIC‐2‐Tb was further utilized to prepare a composite functional sensing carrageenan hydrogel material for the rapid detection of OFX in meat in real time and the first discovery of impressive afterglow in MOF‐based hydrogels. This study not only presents novel Ln‐MOF materials and Ln‐MOF‐based hydrogel films for luminescent sensing of OFX, but also demonstrates color‐tunable luminescent films with afterglow, which expands the application of composite luminescent materials for detection and anti‐counterfeiting.This article is protected by copyright. All rights reserved

An acid-chromic luminescent lanthanide metallogel for time-dependent information encryption and anti-counterfeiting

“…Lanthanide metallogels, driven by dynamic coordination interactions, π–π stacking, hydrogen bonding, van der Waals forces, or other intermolecular non-covalent interactions, offer distinct advantages in the realms of information encryption and anti-counterfeiting. 7–9 These advantages stem not only from their unique optical properties—long luminescence lifetimes, good monochromaticity, and large Stokes shifts—but also from their stimulus-responsive characteristics. 10,11…”