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We represent a fluorescence resonance energy transfer (FRET) system using upconversion nanoparticles (UCNPs) and the gold nanorods (GNRs) as the energy donor–acceptor pair for directly determining streptavidin in near-infrared (NIR) region. NaYF 4 :Yb,Tm UCNPs, which had a strong emission at 800nm under 980-nm excitation, were adopted as the energy donor. The GNRs, which demonstrated strong...
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