Journal
RSC ADVANCES
Volume 8, Issue 23, Pages 12944-12950Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra01752b
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Funding
- National Natural Science Foundation of China [51572067, 21471043, 21501039, 51702309]
- Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology [2016FXZY005]
- Natural Science Foundation of Anhui Province of China [1708085ME114]
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Upconversion core-shell nanoparticles have attracted a large amount of attention due to their multifunctionality and specific applications. In this work, based on a NaGdF4 sub-10 nm ultrasmall nanocore, a series of core-shell upconversion nanoparticles with uniform size doped with Yb3+, Er3+ and NaDyF4 shells with different thicknesses were synthesized by a facile sequential growth process. NaDyF4 coated upconversion luminescent nanoparticles showed an obvious fluorescence quenching under excitation at 980 nm as a result of energy resonance transfer between Yb3+, Er3+ and Dy3+. NaGdF4:Yb,Er@NaDyF4 core-shell nanoparticles with ultrathin layer shells exhibited a better T-1-weighted MR contrast.
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