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. 2019 Jul 5;24(13):2476. doi: 10.3390/molecules24132476

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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FTIR-spectra of the UCNP samples: (a) UCNPs hydrophilized with tetramethylammonium hydroxide (TMAH); (b) UCNP–GMA before photo-induced crosslinking; (c) UCNPs encapsulated in PEG-DA.