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We show that core/shell structure, NaYF4∶Yb,Er/Tm@CaF2, that the shell is epitaxial growth over the core, is a good way to isolate the emitters from the surface quenching sites, and enhancing the upconversion emission from Er3+ and Tm3+.[1] The shell is also benefit from suppressing the rare earth ions release from sodium rare earth fluorides.