Fig. 3From: Revisiting the Enhanced Red Upconversion Emission from a Single β-NaYF4:Yb/Er Microcrystal By Doping with Mn2+ Ionsa UC emission spectra from a single β-NaYF4:Yb/Er/Mn (20/2/10 mol%) microcrystal irradiated with different excitation intensities. b The UC emission intensity ratios for a single β-NaYF4:Yb/Er/Mn (20/2/10 mol%) microcrystal as a function of the excitation intensities. c The dependence of the UC emission intensity on the excitation intensity for a single β-NaYF4:Yb/Er/Mn (20/2/10 mol%) microcrystalBack to article page