Fig. 5From: Classification, Synthesis, and Application of Luminescent Silica Nanoparticles: a Reviewa The formation of UCNPs@SiO2@EuTP and TEM (transmission electron microscope) images of the samples; b, c for UCNPs, d, e for UCNPs@SiO2, and f, g for UCNPs@SiO2@EuTP [31]Back to article page