Please use this identifier to cite or link to this item: https://doi.org/10.1021/cm103175s
Title: Strong red-emitting near-infrared-to-visible upconversion fluorescent nanoparticles
Authors: Yi, G.
Peng, Y.
Gao, Z. 
Keywords: bioimaging
core/shell
nanoparticles
upconversion fluorescence
Yttrium oxyfluoride
Issue Date: 14-Jun-2011
Citation: Yi, G., Peng, Y., Gao, Z. (2011-06-14). Strong red-emitting near-infrared-to-visible upconversion fluorescent nanoparticles. Chemistry of Materials 23 (11) : 2729-2734. ScholarBank@NUS Repository. https://doi.org/10.1021/cm103175s
Abstract: Near infrared (NIR)-to-red upconversion fluorescent nanoparticles of yttrium oxyfluoride, ytterbium, erbium/yttrium oxyfluoride (YOF:Yb,Er/YOF) with a core/shell structure have been prepared for the first time. Under 980 nm NIR excitation, they emitted strong red upconversion fluorescence with a sharp emission band topping at ∼669 nm. Compared with the most efficient green emitting hexagonal phase NaYF4:Yb,Er upconversion fluorescent nanoparticles, our red-emitting fluorescent nanoparticles exhibited even stronger fluorescence. The YOF shell played a dual-role in the upconversion: it greatly enhanced the red emission at ∼669 nm (∼18 times) and suppressed the green emission of erbium at ∼530 nm. These nanoparticles were rendered hydrophilic by using several strategies and were further conjugated to antibodies for cancer cell labeling and imaging. As both excitation and emission were in the long wavelength range (>650 nm), which are transparent to tissues, along with their strong and narrow emission, these red emission upconversion fluorescent nanoparticles offer excellent opportunities for biosensing and in vivo bioimaging applications. © 2011 American Chemical Society.
Source Title: Chemistry of Materials
URI: http://scholarbank.nus.edu.sg/handle/10635/94894
ISSN: 08974756
DOI: 10.1021/cm103175s
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