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Up-Conversion Nanoparticles are luminescent nanomaterials capable of converting low-energy near-infrared radiation into higher-energy visible or ultraviolet emission through a nonlinear optical process. This unique property makes UCNPs highly suitable for virus detection due to minimal background fluorescence, deep tissue penetration, and high signal stability. In a typical detection mechanism, UCNPs are functionalized with specific biorecognition _____ ____ ________ __________ ________ ______ ____ ____ ________.
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