Figure 4.

XRD patterns of the NaLuF4 samples. (a) Standard data of cubic phase (JCPDS:27–0725), (b) standard data of hexagonal phase (JCPDS:27–0726), (c) IL-UCNPs, (d) SDS-UCNPs, (e) DDBAC-UCNPs, (f) PEG-UCNPs, and (g) Cit-Na-UCNPs.

Zhou et al. Nanoscale Research Letters 2013 8:518   doi:10.1186/1556-276X-8-518
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