Skip to main content
. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Curr Mol Med. 2013 Dec;13(10):1613–1632. doi: 10.2174/1566524013666131111122133

Fig. (1).

Fig. (1)

Represent TEM images of NaYF4:Yb3+/Er3+ nanospheres at low (A) and high (B) magnifications. (C) Photographs of the nanospheres in hexane under the excitation of a 980 nm laser. From left to right: total upconversion fluorescence of NaYF4:Yb3+/Tm3+ (25/0.3 mol%) nanospheres, total upconversion fluorescence of NaYF4:Yb3+/Er3+ (18/2 mol%) nanospheres, and fluorescence of NaYF4:Yb3+/Er3+ (18/2 mol%) nanospheres passing through red and green filters. Reprinted with permission from [57].