AI Insight
Researchers developed a water-based upconversion nanoparticle ink that can be printed using standard inkjet technology and read using near-infrared (NIR) light. The nanoparticles convert NIR light to visible light, creating invisible patterns that only appear under specific illumination conditions. The ink maintains stability in aqueous solutions and enables high-resolution printing on various substrates including paper and plastic.
Why it matters
This technology enables advanced anti-counterfeiting measures for documents, currency, and product authentication through invisible QR codes and security patterns that cannot be replicated with conventional printers. The water-based formulation makes it compatible with existing printing infrastructure, facilitating practical implementation in commercial security printing applications.
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