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Monodisperse Sr 2 YF 7 nanocrystals with the size of sub-10nm were synthesized via a solvothermal method by using oleate as a capping ligand. X-ray diffraction and transmission electron microscopy assays reveal that the as-synthesized Sr 2 YF 7 nanocrystals are face-centered cubic structure with the cell parameter a=5.704Å. Intense upconversion luminescence can be observed...