Elaboration, Structure and Luminescence of Sphere-Like CaF2:RE Sub-Microparticles by Ionic Liquids Based Hydrothermal Process
A new and simple method for the synthesis of rare earth ion doped CaF2 (CaF2:RE3+) submicroparticles is presented, using an ionic liquids based hydrothermal process. The structural properties of the CaF2 nanoparticles were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The CaF2 nanoparticles exhibited a sphere-like morphology with a diameter of about 150 nm. During the synthesis, the ionic liquid [bmim]BF4 (1-butyl, 2-methylimidazolium tetrafluoroborate) acts as both a co-solvent and reactant. The crucial effect of EDTA-2Na (ethylene diamine tetra acetic acid disodium salt) on the formation of CaF2:RE sub-microparticles was explored and discussed. The strong green (513–569 nm) and strong red (636–685 nm) upconversion emissions of the CaF2:Er3+,Yb3+ nanoparticles (λex = 980 nm) were also investigated. The luminescent properties of CaF2:Eu3+ and CaF2:Ce3+,Tb3+ were also evaluated. This work may represent a new step in synthesizing fluoride sub-nanocrystals using ionic liquids.
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Document Type: Research Article
Publication date: January 1, 2016
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