Fig. 4From: Classification, Synthesis, and Application of Luminescent Silica Nanoparticles: a ReviewThe curves of fluorescence intensity changing with exposure time under 365 nm irradiation, a parent Eu complex in CHCl3 solution, b Eu@Si-NH2, and c Eu@Si-OH nanoparticles in phosphate-buffered saline (PBS) buffer solution [30]Back to article page