A novel series of active-core/active-shell upconverting nanoparticles (AC/AS-UCNPs) based on NaGdF 4 doped with Yb 3+ /Er 3+ in the core and Yb 3+ /Dy 3+ in the shell having average particle size between 29.2 and 32.9 nm were synthesized. The UCNPs exhibit favorable properties for bimodal magnetic resonance imaging (MRI) and optical imaging (OI). Excitation of the UCNPs at 980 nm dispersed in water at room temperature resulted in intense green upconversion emission of Er 3+ . The proton nuclear magnetic relax…
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