Please use this identifier to cite or link to this item:
|Title:||Synthesis of hexagonal-phase NaYF4:Yb,Er and NaYF 4:Yb,Tm nanocrystals with efficient up-conversion fluorescence|
|Citation:||Yi, G.S., Chow, G.M. (2006-12-04). Synthesis of hexagonal-phase NaYF4:Yb,Er and NaYF 4:Yb,Tm nanocrystals with efficient up-conversion fluorescence. Advanced Functional Materials 16 (18) : 2324-2329. ScholarBank@NUS Repository. https://doi.org/10.1002/adfm.200600053|
|Abstract:||IR-to-visible up-conversion fluorescent nanocrystals of hexagonal-phase NaYF4:20 %Yb,2 %Er and NaYF4:20%Yb,2%Tm have been synthesized by decomposition of multiprecursors of CF3COONa, (CF 3COO)3Y, (CF3COO)3Yb, and (CF 3COO)3Er/(CF3COO)3Tm in oleylamine at 330 °C. The average particle size is 10.5±0.7 nm (from random measurements of 200 particles from five transmission electron microscopy images) and 11.1±1.3 nm (from dynamic-light-scattering measurements). The upconversion fluorescence intensity of the hexagonal nanocrystals in this work is much higher than that of other cubic-phase NaYF4:Yb,Er nanocrystals, including the ones in this work (by a factor of 7.5). Mechanisms for nucleation and growth of the hexagonal-phase nanoparticles are proposed. These nanocrystals are easily dispersed in organic solvents, producing a transparent colloidal solution. The hydrophobic surfaces of the particles are made hydrophilic using a bipolar surfactant. These nanoparticles and their dispersions in various media have potential applications in optical nanodevices and bioprobes. © 2006 WILEY-VCH Verlag GmbH & Co. KGaA.|
|Source Title:||Advanced Functional Materials|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 14, 2018
WEB OF SCIENCETM
checked on Jun 20, 2018
checked on Jul 6, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.