Research Article

Tunable Upconversion Luminescence and Energy Transfer Process in BaLa2ZnO5:Er3+/Yb3+ Phosphors

Figure 2

SEM images of the BaLa2ZnO5:0.05Er3+/0.10Yb3+ plotting scale ×1000 (a) and plotting scale ×5000 (b).
(a)
(b)