Reversible Luminescence Transition of Upconversion Nanocrystals Embedded Nanoemulsion Composite Microgels
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초록
내용
Luminescent nanoparticles are widely used in anti-counterfeit systems due to their dual detection capability, providing easily interpretable optical and spectral information. Particularly, Upconversion nanoparticles (UCNPs), which convert near-infrared light into visible light, are attractive for unique properties, including low-auto fluorescence, a large anti-Stokes shift, and physicochemical stability. In this study, we present a facile synthesis method for UCNPs embedded photocurable nanoemulsion (NE) and fabrication of hydrogel microstructures using the DMD-based maskless lithography. Our system exhibits significant reversible volumetric and luminescence intensity alterations of microstructures whether exposed to water or not. Its “on-off” behavior is expected to offer an effective secured encryption to prevent imitation. Moreover, the combination of UCNPs embedded NE resin and the scalable DMD lithography allows for rapid and mass production of secure anti-counterfeit systems.