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. 2012 Oct 22;4(4):1067–1105. doi: 10.3390/cancers4041067

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© 2012 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 license (http://creativecommons.org/licenses/by/3.0/).

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TEM images of LiYF₄:Yb³⁺, Tm³⁺ nanocrystals ([28]) (A) before and (B) after silica coating as well as TEM images of NaYF₄:Yb/Er up-conversion nanocrystals: (C, D) before and (E, F) after silica coating ([75], reproduced by permission of Wiley).