Intense Red Upconversion Emission and Shape Controlled Synthesis of Gd₂O₃:Yb/Er Nanocrystals

Figure 1

XRD pattern of (a) Gd₂O₃:Yb/Er (pH = 7) and (b) Gd₂O₃:Yb/Er (pH = 14) nanocrystals and (c) standard cubic phase Gd₂O₃.