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dc.contributor.author나혜진-
dc.contributor.author우경자-
dc.contributor.author임기필-
dc.contributor.author장호성-
dc.date.accessioned2015-12-03T00:57:36Z-
dc.date.available2015-12-03T00:57:36Z-
dc.date.issued201305-
dc.identifier.citationVOL 5, NO 10, 4242-4251-
dc.identifier.issn20403364-
dc.identifier.other39603-
dc.identifier.urihttp://pubs.kist.re.kr/handle/201004/44874-
dc.description.abstractWe report the systematic control of the morphology of β-NaYF4:Yb,Er/Tm upconversion nanophosphors (UCNPs) from large spheres (37.9 nm) to rods (length = 60.1 nm, width = 21.5 nm) and from rods to hexagonal prisms (length = 48.8 nm, width = 44.0 nm) or small spheres (14.0 nm) by the use of a surfactant, an additive, and lanthanide doping. Increasing the ratio of oleic acid (OA) to 1-octadecene (ODE) caused a decrease in the size of the UCNPs, and increasing the OA/ODE ratio above a critical value caused the particle shape to change from a sphere to a rod. The length-to-width aspect ratio (AR) of upconversion nanorods (UCNRs) was finely manipulated from 1.28 to 2.80. The rounded tips of the UCNRs were flattened by adding Cl− ions, and the UCNRs changed to hexagonal prisms with a controllable AR depending on the quantity of Cl− ions. Additionally, the morphology of the β-NaYF4-based UCNPs was controlled by lanthanide doping. The size and AR of the UCNRs decreased with Gd3+ doping, and the UCNRs ultimately transformed into small spheres (14.0 nm) with high monodispersity. Doping with Ce3+ ions also decreased the AR of the UCNRs from 2.80 to 1.27. In addition, highly transparent polymer composites for 3D volumetric displays were fabricated by blending high-AR β-NaYF4:Yb,Er/Tm UCNRs with polydimethylsiloxane. These composites exhibited bright green and blue upconversion light during excitation with 980 nm light.-
dc.publisherNanoscale-
dc.subjectmorphology control-
dc.subjectupconversion-
dc.subjectnanoparticle-
dc.subjectlanthanide-
dc.subjectphosphor-
dc.titleRational morphology control of β-NaYF4:Yb,Er/Tm upconversion nanophosphors using a ligand, an additive, and lanthanide doping-
dc.typeArticle-
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