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https://hdl.handle.net/2440/80791
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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, 2013; 8(10):729-734 |
Publisher: | Nature Publishing Group |
Issue Date: | 2013 |
ISSN: | 1748-3395 1748-3395 |
Statement of Responsibility: | 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 in-vitro nanoparticles fluorescence tm3+ nanophosphors phosphors green light core blue |
Rights: | © 2013 Macmillan Publishers Limited. All rights reserved. |
DOI: | 10.1038/nnano.2013.171 |
Grant ID: | http://purl.org/au-research/grants/arc/DP1095465 http://purl.org/au-research/grants/arc/LP130100517 |
Published version: | http://dx.doi.org/10.1038/nnano.2013.171 |
Appears in Collections: | Aurora harvest 4 IPAS publications |
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