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. 2011 Oct 3;6(1):539. doi: 10.1186/1556-276X-6-539

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Copyright ©2011 Shan et al; licensee Springer.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Colloidal solutions of NaYF₄:20% Yb³⁺, 2% Er³⁺sample in n-hexane. (A) The solution showing its transparency. (B) Visible upconversion luminescence excited by 980 nm laser oxide. (C) Upconversion luminescence emission spectrum.