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Water-soluble Ln 3+ -doped β-NaGdF 4 (Ln=Ce, Tb, Eu, Dy) nanocrystals were synthesized via a hydrothermal method followed by phase transferring. The nanocrystals crystallize in the hexagonal phase as β-NaGdF 4 . Tunable multicolor down-conversion emissions can be achieved from Ln 3+ -doped β-NaGdF 4 nanocrystals under a single ultraviolet excitation. During...
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