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Type: Journal article
Title: Single-nanocrystal sensitivity achieved by enhanced upconversion luminescence
Author: Zhao, J.
Jin, D.
Schartner, E.
Lu, Y.
Liu, Y.
Zvyagin, A.
Zhang, L.
Dawes, J.
Xi, P.
Piper, J.
Goldys, E.
Monro, T.
Citation: Nature Nanotechnology (online), 2013; 8(10):729-734
Publisher: Nature Publishing Group
Issue Date: 2013
ISSN: 1748-3395
Statement of
Jiangbo Zhao, Dayong Jin, Erik P. Schartner, Yiqing Lu, Yujia Liu, Andrei V. Zvyagin, Lixin Zhang, Judith M. Dawes, Peng Xi, James A. Piper, Ewa M. Goldys and Tanya M. Monro
Abstract: Upconversion nanocrystals convert infrared radiation to visible luminescence, and are promising for applications in biodetection, bioimaging, solar cells and three-dimensional display technologies. Although the design of suitable nanocrystals has improved the performance of upconversion nanocrystals, their emission brightness is limited by the low doping concentration of activator ions needed to avoid the luminescence quenching that occurs at high concentrations. Here, we demonstrate that high excitation irradiance can alleviate concentration quenching in upconversion luminescence when combined with higher activator concentration, which can be increased from 0.5 mol% to 8 mol% Tm(3+) in NaYF₄. This leads to significantly enhanced luminescence signals, by up to a factor of 70. By using such bright nanocrystals, we demonstrate remote tracking of a single nanocrystal with a microstructured optical-fibre dip sensor. This represents a sensitivity improvement of three orders of magnitude over benchmark nanocrystals such as quantum dots.
Keywords: Yttrium; Microscopy, Electron, Transmission; Biosensing Techniques; Luminescence; Particle Size; Nanotechnology; Nanoparticles
Rights: © 2013 Macmillan Publishers Limited. All rights reserved.
RMID: 0020131820
DOI: 10.1038/nnano.2013.171
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Appears in Collections:IPAS publications

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