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. 2019 Jul 12;1(9):3463–3473. doi: 10.1039/c9na00336c

Fig. 10. (a) Upconversion spectra of nanocrystals doped with Yb3+/Er3+, Yb3+/Tm3+ and Yb3+/Tb3+ ions. (b) Photographs of the upconversion luminescence from colloidal NaYF4 nanoparticles doped with different lanthanide ions measured at the same concentrations and with the same recording settings.

Fig. 10