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

Figure 2

(a) TEM image of Gd(OH)₃:Yb/Er (pH = 7). (b) EDS analysis of Gd₂O₃:Yb/Er nanorods shown in (f). (c) TEM image of Gd₂O₃:Yb/Er (pH = 7) and the corresponding (d) HRTEM and (e) SAED, respectively. (f) TEM image of Gd₂O₃:Yb/Er (pH = 14). (g) TEM of a single nanorod and (h) the corresponding HRTEM image. (i) The SAED characterization of nanorods shown in (f).