Preparation And Characterization Of Rare Earth Ions-doped Lanthanum Oxychloride Low-dimensional Nanomaterials

Rare earth oxychlorides are extensively used as luminescent matrixes owing to their high absorption of light and energy transfer efficiency. Rare earth oxychlorides have become one of the popular research subjects in the realm of optical functional materials in recent years due to their wide applications in the fields of color display, catalysis, photoelectric conversion, gas sensing, etc. Presently, many methods have been successfully employed to fabricate rare earth oxychloride micro-and nanomaterials with different morphology. Electrospinning has been proved to be one of the best methods to fabricate low-dimensional nanomaterials owing to its simple operation, high efficiency and reproducibility. Hence, fabrication of rare earth ions-doped rare earth lanthanum oxychloride nanofibers, nanobelts and hollow nanofibers via electrospinning combined with a double-crucible chlorination technique remains an important and challenging subject of study.In this dissertation, PVP/rare earth nitrates composite nanofibers and nanobelts were fabricated by electrospinning, and the intermediates were prepared through calcination of the relevant composites. LaOCl:RE3+(RE=Eu,Tb,Nd,Yb/Er) luminescent nanofibers, nanobelts and hollow nanofibers were successfully prepared through chlorination of the intermediates via a double-crucible chlorination technique using NH4CI powders as chlorinating agent. The samples were systematically characterized by XRD, SEM, EDS, TEM, PL and BET method. The results show that LaOCl:RE3+nanofibers, nanobelts and hollow nanofibers are pure orthorhombic structure with space group P4/nmmm. The mean diameter and width of LaOCl:RE3+nanofibers, nanobelts are about90-280nm and3-6μm, respectively. The fluorescent spectra results demonstrate that LaOCl:RE3+nanomaterials are excellent fluorescent nanomaterials. Possible formation mechanisms of rare earth lanthanum oxychloride nanomaterials are also proposed and some meaningful results are obtained. These findings lay solid foundations for the future study of luminescent performances of rare earth ions-doped rare earth lanthanum oxychloride low-dimensional nanomaterials.