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. Author manuscript; available in PMC: 2016 Jun 20.
Published in final edited form as: ACS Nano. 2016 Jan 11;10(1):1060–1066. doi: 10.1021/acsnano.5b06383

Figure 1.

Figure 1

(a) Emission spectra of IR-806-dye-senstized UCNPs exhibiting various β-NaYF4 shell thickness (i.e., 0, 2.5, 5, 7.5, 10, and 12.5 nm, respectively) upon 800 nm CW laser excitation. (b) The integrated emission peak area (from 500 to 700 nm) of those dye-sensitized UCNPs decreases as the shell thickness increases. Note: In order to guide the eye, the data points are connected by lines.