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. 2016 Aug 12;5(8):e16136. doi: 10.1038/lsa.2016.136

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Copyright © 2016 CIOMP

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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In situ UC emission spectra and the corresponding optical image of (a) the NaYF₄:Yb³⁺, Tm³⁺/PS HFM; (b) the NaYF₄:Yb³⁺, Tm³⁺/PS HFM loaded with a single avidin droplet; (c) the NaYF₄:Yb³⁺, Tm³⁺/PS HFM after removal of the above avidin droplet via pipette and (d) the NaYF₄:Yb³⁺, Tm³⁺/PS HFM loaded with a single RhB droplet; (e) spectral evolution on the normalized UC emission of the NaYF₄:Yb³⁺, Tm³⁺/PS HFM loaded with RhB droplets at different pHs; (f) the emission peak positions of RhB versus the corresponding pHs changes in the RhB droplet.