A new upconversion luminescent material (fluoroxide material) co doped with erbium and ytterbium was reported. The absorption and upconversion luminescence were studied and compared with the upconversion characteristics of Er 3+ in ZBLAN host. Although the absorption bands are same, the intensity of absorption is different from each other. The upconversion intensity of Er 3+ in fluoroxide host is weaker than that in ZBLAN host. The red intensity is stronger than the green intensity in oxyfluoride...