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. Author manuscript; available in PMC: 2019 Jul 8.
Published in final edited form as: Nano Lett. 2019 May 10;19(6):3878–3885. doi: 10.1021/acs.nanolett.9b01057

Figure 2.

Figure 2.

a) XRD patterns of SrLuF core and core/shell samples match face-centered cubic crystal structure with space group Fm-3m. b) XRD patterns of the CS5 UCNPs in direct comparisons. All alkaline-earth rare-earth fluoride (MLnF) compounds fit best to face-centered cubic crystal structure. The heavier the alkaline-earth metals in the compounds, the shorter the lattice parameters as expressed in XRD peak shift to lower diffraction angels. The NaGdF sample shows pure hexagonal-phase.