Hydrothermal Synthesis of β-NaYF4:Yb, Er Nanocrystals with Upconversion Fluorescence Using Tetraethylene Pentamine as Chelating Ligand

Figure 2

Upconverted fluorescence spectra of NaYF₄:Yb, Er nanocrystals prepared under different ratio of RE/TEPA (𝑡 = 6 h; water/ethanol = 1 : 1; 16.7 mmol/L).