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

Figure 3

Comparison of UC luminescence spectra of the BaLa₂ZnO₅:xEr³⁺/0.10Yb³⁺ (x = 0.2%, 0.5%, 1%, 2%, 3%, 4%, 5%, 7%, and 10%) under 980 nm laser excitation (a), and the variation of green and red emission intensities corresponds to different Er³⁺ doping concentration (b).

(a)

(b)