Journal
NANOSCALE
Volume 7, Issue 24, Pages 10775-10780Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr02287h
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Funding
- Natural Science Foundation of China [51402071, 81271734]
- International Scientific and Technological Cooperation projects [2014DFA50740]
- National Science Fund for Distinguished Young Scholars [51325201]
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We report on heterogeneous core/shell CaF2:Yb3+/Ho3+@NaGdF4 nanocrystals of 17 nm with efficient upconversion (UC) photoluminescence (PL) for in vivo bioimaging. Monodisperse core/shell nanostructures were synthesized using a seed-mediated growth process involving two quite different approaches of liquid-solid-solution and thermal decomposition. They exhibit green emission with a sharp band around 540 nm when excited at similar to 980 nm, which is about 39 times brighter than the core CaF2:Yb3+/Ho3+ nanoparticles. PL decays at 540 nm revealed that such an enhancement arises from efficient suppression of surface-related deactivation from the core nanocrystals. In vivo bioimaging employing water-dispersed core/shell nanoparticles displayed high contrast against the background.
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