Representation of core-shell lanthanide doped #nanoparticles for #upconversion (UCNPs) capped with oleic acid.
UCNPs can absorb two or more low energy #photons and convert them into one photon with higher energy, which is then emitted. As-prepared UCNPs are usually capped with hydrophobic oleic acid to prevent aggregation with other nanoparticles and to control their growth.
They are of particular interest for bio-imaging, bio-sensing and nanomedicine, but also for photovoltaic applications.
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