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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. 5 — a Size distribution of NaYF₄:30%Yb0.5%Tm UCNPs with and without carboxyl modification in cyclohexane and in water, respectively. TEM images of b NaYF₄:30%Yb0.5%Tm UCNPs in cyclohexane, and c NaYF₄:30%Yb0.5%Tm@carboxyl UCNPs in water. d Emission fluorescence spectra of NaYF₄:30%Yb0.5%Tm UCNPs with and without surface modification in cyclohexane and in water, respectively, and insets are corresponding camera picture of (i) NaYF₄:30%Yb0.5%Tm, and (ii) NaYF₄:30%Yb0.5%Tm@carboxyl UCNPs