Abstract
Na5Lu9F32 single crystals doped with Tm3+, Yb3+ and Nd3+ ions, have been successfully prepared by an improved Bridgman method. The dual-model up/downconversion luminescence was investigated under near-infrared (NIR) light (800 nm) excitation. The Tm3+, Yb3+, Nd3+ tri-doped Na5Lu9F32 single crystals exhibit intense up-converted blue emission at 488 nm, which correspond to the 1G4→3H6 transitions of Tm3+ ions, the green and yellow emissions at 532 and 589 nm be ascribed to 2G7/2 → 4I9/2 and 2G7/2 → 4I11/2 transitions of Nd3+, respectively. Meanwhile, three emission bands originating from Nd3+ around 860–900, 1060, and 1320 nm in the NIR region can also be observed. The up/down-conversion luminescence intensity was further enhanced by increasing Nd3+ concentration. The lifetime of Yb3+ around 980 nm (307 μs) and Nd3+ at 1060 nm (17.96 μs) were measured. The energy transfer processes in the Yb3+, Tm3+, Nd3+ tri-doped Na5Lu9F32 single crystal have been investigated and discussed.
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