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. 2019 Sep 23;14:7759–7780. doi: 10.2147/IJN.S221433

Figure 5.

Figure 5

(A) Schematic procedure of synthesizing α-NaYF4:Yb,Er nanocrystals and growing stages consecutively through the thermal decomposition method. Reproduced with permission from Mai H-X, Zhang Y-W, Sun L-D, Yan C-H. Size- and phase-con-trolled synthesis of monodisperse NaYF4: Yb,ErNanocrystals from a unique delayed nucleation pathway monitored with upconversion spectroscopy. J Phys Chem C. 2007;111(37):13730–13739.106 Copyright American Chemical Society 2007. Various sizes of NaYF4-based nanoparticles that have been synthesized under 330°C in OA/ODE (1/1) for (B) 15 min, (C) 25 min, and (D) 45 min. Reproduced with permission from Mai H-X, Zhang Y-W, Si R, et al. High-quality sodium rare-earth fluoride nanocrystals: controlled synthesis and optical properties. J Am Chem Soc. 2006;128(19):6426–6436.107 Copyright American Chemical Society 2006.