Fig. 3: Luminescence modulation of Yb–Er system. | Nature Communications

Fig. 3: Luminescence modulation of Yb–Er system.

From: Excitation energy mediated cross-relaxation for tunable upconversion luminescence from a single lanthanide ion

Fig. 3

a Different energy transfer process in the nanoparticles NaYbF4:Er@NaYF4:Yb@NaNdF4:Yb when changing Yb doping ratio in the migrating layer. b Scheme for cross-relaxation process between Yb ions and Er ions. c TEM image of the nanoparticles NaYbF4:Er@NaYF4:Yb (10%) @ NaNdF4:Yb. Scale bar is 100 nm. d Luminescent spectra of the nanoparticles under 808 nm excitation when Yb doping ratio changed from 10% to 90% in the migrating shell. e Luminescent images of the nanoparticles NaYbF4:Er@NaYF4:Yb(10%)@NaNdF4:Yb in quartz capillary under 980 and 808 nm excitation. f Luminescent images of the nanoparticles NaYbF4:Er@NaYF4:Yb(90%)@NaNdF4:Yb in capillary under 980 and 808 nm excitation. Scale bar is 2 cm. g Intensity ratios of red emission to green emission of the nanoparticles NaYbF4:Er@NaYF4:Yb(x%)@NaNdF4:Yb under different 980 and 808 nm excitation power. Data are presented as mean values ±SD (n = 3). Source data in Fig. 3d and g are provided as a source data file.

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