aState Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
bKey Laboratory of Marine Bioresources and Ecology, College of Life Science, Shenzhen University, Shenzhen 518060, China
cChangchun Institute Technology, Changchun 130012, China
dUniversity of Chinese Academy of Sciences, Beijing 100049, PR China
Abstract
In this paper, we report fabrication and characterization of the luminomagnetic microspheres (denoted as Fe3O4@SiO2-[Eu(DBM)3phen]Cl3). The fluorescent magnetic microspheres were synthesized via preparing Eu(DBM)3phen]Cl3@SiO2–NH2 nanoparticles first by combination of solvent precipitation method and Stöber method, followed by grafting the fluorescent nanoparticles onto the Fe3O4. The morphological, textural, magnetic, surface and photoluminescence properties were well-characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), superconducting quantum interference device (SQUID), and photoluminescence spectra. The experimental results show that the core-shell structured luminomagnetic microspheres with an average size of ca. 570 nm possessed high magnetization saturation values (61.7 emu/g) with a negligible coercivity and strong red emission peak (614 nm) from 5D0-7F2 transition of Eu3+ ions, indicating that they have potential applications for optical imaging and time-resolved fluorescence spectroscopy.
