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|Title:||The effects of surface and surface coatings on fluorescence properties of hollow NaYF4:Yb,Er upconversion nanoparticles|
|Citation:||Karvianto, Chow, G.M. (2011-01-14). The effects of surface and surface coatings on fluorescence properties of hollow NaYF4:Yb,Er upconversion nanoparticles. Journal of Materials Research 26 (1) : 70-81. ScholarBank@NUS Repository. https://doi.org/10.1557/jmr.2010.30|
|Abstract:||Hollow nanoparticles of hexagonal close-packed (hcp)-NaYF4:Yb,Er were synthesized by thermal decomposition of trifluoroacetate precursors at 340 °C via vacancy diffusion, likely due to the Kirkendall effect and Ostwald ripening mechanism. The average outer diameter, inner diameter, and shell thickness of these hollow particles were 14 ± 3 nm, 7 ± 2 nm, and 4 ± 1 nm, respectively. The surface effects on the fluorescence properties of these hollow particles were studied by comparing with that of solid NaYF4:Yb,Er (average sizẽ15±3 nm) and solid NaYF4 core/NaYF4:Yb,Er shell (NaYF4 core ̃10 ± 1 nm and NaYF4:Yb,Er shell ̃3 ± 2 nm) nanoparticles containing similar composition of Yb and Er ions. The green, red, and total emission intensities decreased with increasing upconversion active volume-normalized surface area. Surface coatings of undoped NaYF4 on both inner and outer surfaces of the hollow nanoparticles enhanced the total emission intensity by ̃19 and ̃5 times compared with those of the hollow and solid NaYF4:Yb,Er nanoparticles, respectively. © Materials Research Society 2011.|
|Source Title:||Journal of Materials Research|
|Appears in Collections:||Staff Publications|
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