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