Enhanced ~ 2 μm and upconversion emission from Ho-Yb codoped oxyfluoride glass ceramics

► Ho-Yb codoped oxyfluoride silicate glass and glass ceramics were fabricated. ► Nanocrystals Ba2YbF7 were successfully precipitated in glass ceramics. ► Enhanced 2 μm emission in the oxyfluoride silicate glass ceramics was obtained. ► Intense upconversion emission in the oxyfluoride silicate glass ceramics was obtained.