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The upconversion luminescence of Er3 /Yb3 ions is researched in a novel transparent oxyfluoride borosilicate glass and glass ceramics under 980-nm excitation. Fluoride nanocrystals Ba2YF7 are successfully precipitated in glass matrix, which is affirmed by the X-ray diffraction results. Compared with the parent glasses, significant enhancement of upconversion luminescence is observed in the Er3 /Yb3 codoped transparent glass-ceramics, which may be due to the variation of coordination environment around Er3 and Yb3 ions after crystallization. The possible upconversion mechanism is also discussed.