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(a) Schematic representation of the facile preparation and the core@shell architecture of the KY3F10 NPs. (b) Sketched crystal structure of undoped KY3F10 matrix (K in violet, Y in green, F in orange). (c) X-rays powder diffraction patterns for core and core@shell nanoparticles, ICSD reference: a (222); b (400); c (151); d (404); e (226); f (444); g (080).
