Abstract
Yb3+-doped oxyfluoride glass ceramics were fabricated by melt-quenching and subsequent heating. X-ray diffraction and high-resolution transmission electron microscopy analyses evidenced that orthorhombic TbF3 nanocrystals with a mean size of 22 nm were homogeneously precipitated among the aluminosilicate glass matrix. The incorporation of Yb3+ ions into TbF3 crystals was confirmed by energy-dispersive X-ray spectroscopy. Under 976 nm near-infrared laser excitation, the glass ceramics exhibited intense green Tb3+:5D4 → 7FJ (J = 3, 4, 5, 6) up-conversion luminescence due to the cooperative energy transfer from two Yb3+ ions to one Tb3+ ion. In comparison, under 485 nm excitation, they yielded near-infrared quantum cutting down-conversion emission corresponding to Yb3+:2F5/2 → 2F7/2 transition, ascribing to the cooperative energy transfer from one Tb3+ ion to two Yb3+ ions. The energy transfer processes between Tb3+ and Yb3+ ions were discussed, and the energy transfer efficiency was evaluated.
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