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. 2014 Oct 20;9:4879–4891. doi: 10.2147/IJN.S62678

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© 2014 Wang et al. This work is published by Dove Medical Press Limited, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License

The full terms of the License are available at http://creativecommons.org/licenses/by-nc/3.0/. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

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The relationship between the upconversion emission intensity (I_up) and excitation power (P) of YbPO₄:Er.

Notes: (A) The fluorescence spectra of YbPO₄:Er annealed at 1,100°C excited with a 980 nm near-infrared laser at different pump powers. (B) The corresponding plots (log–log) of emission intensity versus pump power of YbPO₄:Er annealed at 1,100°C.