Fig. 9From: Classification, Synthesis, and Application of Luminescent Silica Nanoparticles: a ReviewThe photographs under normal light to prove the magnetic modification (a, b). c The photograph under UV light to prove both the magnetic and luminescence properties. d The UV photograph of green and orange magnetic quantum dots (MQDs). e, f The luminescence spectra of SiO2-MQDs in PBS solutions (e for absorption and f for emission) [44]Back to article page