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. 2015 Jan 19;5:7851. doi: 10.1038/srep07851

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TEM images of β-NaYF₄:Yb³⁺/Er³⁺ NPs (a) and the core–shell structured UCNPs@MOF NCs with different reaction time (b for 40 min, c for 90 min). HAADF-STEM images of UCNPs@MOF NCs (d). The inset in d is corresponding EDS line scanning profiles.