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Beilstein J. Nanotechnol. 2015, 6, 2290–2299, doi:10.3762/bjnano.6.235
Figure 1: TEM micrographs of OM-NaYF4:Yb3+/Er3+ nanoparticles prepared at (a) 250, (b) 300 and (c) 350 °C for...
Figure 2: Particle size distribution of no. 4 OM-NaYF4:Yb3+/Er3+ nanoparticles (Table 1) determined by DLS.
Figure 3: X-ray diffraction patterns of OM-NaYF4:Yb3+/Er3+: effect of (a) reaction temperature (time 1 h) and...
Figure 4: TEM analysis: (a) ED pattern, (b) comparison of experimental ED pattern and calculated XRD pattern,...
Figure 5: TEM analysis: (a) ED pattern, (b) comparison of experimental ED pattern and calculated XRD pattern,...
Figure 6: TGA of OM–NaYF4:Yb3+/Er3+ nanoparticles prepared at (a) different reaction temperatures for 1 h and...
Figure 7: NIR-to-vis upconversion emission spectra of OM–NaYF4:Yb3+/Er3+ nanoparticles excited at 980 nm with...
Figure 8: Energy-level diagram of Yb3+/Er3+ and the upconversion mechanism at 980 nm excitation. The doted an...
Figure 9: TEM micrograph of NaYF4:Yb3+/Er3+&SiO2 nanoparticles. Inset: C – particle core and S – SiO2 shell.
Figure 10: ATR FTIR spectra of OM–NaYF4:Yb3+/Er3+ and NaYF4:Yb3+/Er3+&SiO2 nanoparticles.