Behavior of Yb³⁺ and Er³⁺ during Heat Treatment in Oxyfluoride Glass Ceramics

Figure 6

Upconversion luminescence in SA1.8EY and A2.18EY samples that obtained exciting at 975 nm which were heat treated at 630, 660, 675, and 690°C for 48 h.

(a)

(b)