Figure 4From: Synthesis of NaYF4:Yb3+, Er3+ upconversion nanoparticles in normal microemulsions Characterization data for NaYF 4 : 20% Yb 3+ , 2% Er 3+ UCNPs after annealing. (A) TEM image. (B) XRD pattern (cubic phase is marked with asterisks) and the calculated line pattern for hexagonal phase of NaYF4 (JCPDS card, No. 28-1192).Back to article page