Figure 2.

Characterization data for NaYF4: 20% Yb3+, 2% Er3+ UCNPs. (A) TEM image (Inlet: HRTEM image of a single nanocrystal). (B) XRD pattern of the sample and the calculated line pattern for cubic phase of NaYF4 (JCPDS card, No. 77-2042).

Shan et al. Nanoscale Research Letters 2011 6:539   doi:10.1186/1556-276X-6-539
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