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. 2017 Dec 29;10(2):31. doi: 10.1007/s40820-017-0184-y

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 6 — a Different surface charge of UCNPs-Ab conjugates at different concentrations of UCNPs, and b corresponding graph for surface charge versus UCNPs concentrations in UCNPs-Ab conjugate. c, e Bright field and d, f corresponding fluorescent microscopy images at 40× magnification of NaYF₄:YbTm microbeads with and without UCNPs-Ab, and g corresponding S/N ratios of UCNPs-Ab at different concentrations of UCNPs used in the conjugation reaction (data represent mean ± SD; n = 20 microbeads)