One-step synthesis of water-dispersible hydroxyl-functionalized NaYF4:Yb/Er upconversion nanoparticles
writer：Benzhao He, Li Zhou*, Jiachang Huang
keywords：Luminescence，Nanoparticles，Upconversion，Water-dispersible，F(xiàn)unctional
source：期刊
specific source：Mater. Lett. 2014, 117, 142-145
Issue time：2014年
Rare-earth
upconversion nanophosphors (UCNPs) with high water-dispersibility and surface functional groups are
promising for bioimaging. In this
paper, we reported a facile strategy for one-step synthesis of water-dispersible hydroxyl-functionalized NaYF4:Yb/Er
UCNPs based on the solvothermal technique by using ricinoleic acid as ligand. TEM and
XRD characterizations indicate that the synthesized UCNPs possess hexagonal phase structure and spherical
shape with a mean diameter of 20 nm. The UCNPs show excellent water-dispersibility
and strong upconversion luminescence. Moreover, the presence of hydroxyl groups on the surface of NaYF4:Yb/Er allows for
further modification as confirmed
by the successful reaction with dodecanoyl chloride. Our strategy opens up opportunities to make full use of water-dispersible
UCNPs in various applications because of their facile availability,
cost-effective productivity and favorable surface
functionality.