Upconversion nanoparticles integrated fluorescence spectroscopy for analytical applications

초록

Upconversion nanoparticles (UCNPs) present a novel solution to converting low-energy near-infrared radiation to higher-energy ultraviolet or visible emissions. This book chapter addresses the inherent limitations of UCNPs, primarily surface-related quenching effects, and suboptimal conversion efficiencies. The primary objective is elucidating strategies for enhancing UCNP luminescence, focusing on rare earth-doped host lattices. We examine methodologies including core/shell structuring, plasmonic enhancement, and energy transfer architecture optimization. Our analysis reveals significant luminescence intensity advancements through precise nanoparticle composition and surface characteristics engineering. The study's originality lies in its comprehensive assessment of UCNP enhancement techniques and their underlying mechanisms. We conclude that the judicious design of the UCNP structure and local environment can substantially improve their fluorescence efficiency. The enhanced UCNPs demonstrate broad applicability in fluorescence-based optical sensing, ranging from ion and radical detection to environmental contaminant analysis and biomarker sensing, underscoring their potential impact across multiple scientific disciplines.

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