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

Figure 1

XRD patterns of the BaLa_1.9−xZnO₅:x%Er³⁺/0.10Yb³⁺ (x = 0.2%, 0.5%, 1%, 2%, 3%, 4%, 5%, 7%, and 10%) and the standard PDF diffraction lines of BaLa₂ZnO₅ as a reference: (a) 10° ≤ 2 ≤ 70° and (b) 29.5° ≤ 2 ≤ 32°.

(a)

(b)