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+.
Highlights
Rare-earth-ion-doped multicomponent compounds have attracted considerable attention due to their potential applications in the fields of electroluminescent devices, high-resolution displays, biological labels, and integrated optics [1,2,3,4]
The micrographs and map microanalysis show that the ionic liquid infiltrates the reticular surface of the membrane
By comparing the XRD pattern of the as-prepared precursors and LaPO4:Ce, Tb phosphor samples, we found that after annealing at 1000 ◦C, the fluorescent powder XRD peaks were sharper, the crystallinity was better and the structure of LaPO4:Ce, Tb had changed from a hexagonal to a monoclinic crystal phase
Summary
Rare-earth-ion-doped multicomponent compounds have attracted considerable attention due to their potential applications in the fields of electroluminescent devices, high-resolution displays, biological labels, and integrated optics [1,2,3,4]. Among these rare-earth-doped oxide phosphors, trivalent-cerium- and terbium-coactivated LaPO4 is significant because of its low solubility in water, its high thermal stability, and its high-efficiency energy transfer between Ce3+ and Tb3+ [5,6,7,8]. LaPO4:Ce3+, Tb3+ phosphors have drawn continuous research attention in several other applications, including transparent fillers/markers, biomedical purposes, and plasma display panels [13,16,17,18]
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