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. 2018 Nov 8;8(66):37618–37622. doi: 10.1039/c8ra07103a

Fig. 2. (a) Luminescence spectra from single NaYF4:Yb3+/Er3+/Zn2+ and NaYF4:Yb3+/Er3+ particle, (b) energy level diagram and possible transitions of Yb3+ and Er3+ ions, (c) enhancement factors for blue, green, and red light emission per unit volume of single particle.

Fig. 2