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. 2017 Oct 23;7:13833. doi: 10.1038/s41598-017-14018-3

Figure 1.

Figure 1

The XRD patterns of β-NaYF4:Ho3+, β-NaYF4:Ho3+@TiO2, and β-NaYF4:Ho3+@TiO2-rGO.