Research Article
Hydrothermal Synthesis of β-NaYF4:Yb, Er Nanocrystals with Upconversion Fluorescence Using Tetraethylene Pentamine as Chelating Ligand
Figure 4
XRD patterns of NaYF4:Yb, Er nanocrystals prepared under different reaction time (RE/TEPA = 1 : 1; water/ethanol = 1 : 1; 16.7 mmol/L).