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Simple Preparation of LaPO4:Ce, Tb Phosphors by an Ionic-Liquid-Driven Supported Liquid Membrane System

1
School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2
Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Xiamen 361021, China
3
Xiamen Institute of Rare Earth Materials, Chinese Academy of Sciences, Xiamen 361021, China
4
Baotou Research Institute of Rare Earths, Baotou 014030, China
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(14), 3424; https://doi.org/10.3390/ijms20143424
Received: 21 June 2019 / Accepted: 3 July 2019 / Published: 12 July 2019
(This article belongs to the Special Issue Ion and Molecule Transport in Membrane Systems)
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Abstract

In this work, LaPO4:Ce, Tb phosphors were prepared by firing a LaPO4:Ce, Tb precipitate using an ionic-liquid-driven supported liquid membrane system. The entire system consisted of three parts: a mixed rare earth ion supply phase, a phosphate supply phase, and an ionic-liquid-driven supporting liquid membrane phase. This method showed the advantages of a high flux, high efficiency, and more controllable reaction process. The release rate of PO43− from the liquid film under different types of ionic liquid, the ratio of the rare earth ions in the precursor mixture, and the structure, morphology, and photoluminescence properties of LaPO4:Ce, Tb were investigated by inductively coupled plasma-atomic emission spectroscopy, X-ray diffraction, Raman spectra, scanning electron microscopy, and photoluminescence emission spectra methods. The results showed that a pure phase of lanthanum orthophosphate with a monoclinic structure can be formed. Due to differences in the anions in the rare earth supply phase, the prepared phosphors showed micro-spherical (when using rare earth sulfate as the raw material) and nanoscale stone-shape (when using rare earth nitrate as the raw material) morphologies. Moreover, the phosphors prepared by this method had good luminescent properties, reaching a maximum emission intensity under 277 nm excitation with a predominant green emission at 543 nm which corresponded to the 5D4-7F5 transition of Tb3+. View Full-Text
Keywords: LaPO4: Ce; Tb; ionic liquid; supported liquid membrane; photoluminescence LaPO4: Ce; Tb; ionic liquid; supported liquid membrane; photoluminescence
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, J.; Dong, H.; Yang, F.; Sun, L.; Zhao, Z.; Bai, R.; Zhang, H. Simple Preparation of LaPO4:Ce, Tb Phosphors by an Ionic-Liquid-Driven Supported Liquid Membrane System. Int. J. Mol. Sci. 2019, 20, 3424.

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