Figure 3

Characterization of NaYF4:Er3+,Yb3+@NaYF4 CSNP: (a) FE-SEM, (b) TEM, (c, d) HR-TEM images, (e) SAED pattern and (f) EDX spectrum corresponding to the isometric nanoparticles (e).
Characterization of NaYF4:Er3+,Yb3+@NaYF4 CSNP: (a) FE-SEM, (b) TEM, (c, d) HR-TEM images, (e) SAED pattern and (f) EDX spectrum corresponding to the isometric nanoparticles (e).