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Oxyfluoride transparent nano-glass-ceramics (nGC) containing luminescent rare earth (RE) ions are extensively studied for their good mechanical and optical properties.Nano-glass-ceramics are very attractive host materials,because they combine the very low phonon energy of fluoride nanocrystal environment able to host Ln3+ ions giving rise to high quantum efficiencies, with the high chemical and mechanical stability of silicate glass matrix.