Figure 4.

EDS line scan graphs in HAADF mode (a,b). EDS line scans for the ideal models of (c) crystalline β-PbF₂ and (d) core-shell structure in NCs. (e) The relative element signal intensity of Pb, Nd, and Cd in GC; the fit curve; and the calculated model curve of element Pb are presented for comparison; (f) The fit curve of relative element intensity ratio Pb/Nd in NCs and the calculated core-shell model curve are also shown.