fig5
![Crystalline phase-dependent cations migration in core-shell lanthanide-doped upconversion nanoparticles](https://image.oaes.cc/3deea838-56d1-4d61-90d1-faf23344c412/20236.fig.5.jpg)
Figure 5. PL spectra (A) and decay curves of emissions at 407 (B); 540 (C); and 651 nm (D) for -NaYF4:10%Er@NaYbF4@NaYF4 UCNPs before and after annealing at 400 °C for 4 h (980-nm excitation).
Figure 5. PL spectra (A) and decay curves of emissions at 407 (B); 540 (C); and 651 nm (D) for -NaYF4:10%Er@NaYbF4@NaYF4 UCNPs before and after annealing at 400 °C for 4 h (980-nm excitation).
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