Journal Article

Synthesis and luminescence properties of LaOCl:Eu super(3+) nanostructures via the combination of electrospinning with chlorination technique

Liu, Guixia, Yu, Wensheng, Dong, Xiangting, Wang, Jinxian, Kong, Qingling

2013

Overview

LaOCl:Eu super(3+) nanofibers, nanobelts and nanotubes were prepared by electrospinning combined with a double-crucible chlorination technique using NH sub(4)Cl as chlorinating agent. Different morphologies of LaOCl:Eu super(3+) were obtained via adjusting some of the electrospun parameters. X-ray powder diffraction analysis indicated that LaOCl:Eu super(3+) nanostructures were tetragonal with space group P4/nmm. Scanning electron microscope analysis and histograms revealed that diameters LaOCl:Eu super(3+) nanofibers and nanotubes, and the width of LaOCl:Eu super(3+) nanobelts were respectively 198.64 plus or minus 15.07, 168.86 plus or minus 24.70 and 2.103 plus or minus 0.3345 mu m under the 95 % confidence level. Transmission electron microscope observation showed that as-obtained LaOCl:Eu super(3+) nanotubes were hollow-centered structure. Photoluminescence (PL) analysis manifested that the LaOCl:Eu super(3+) with different morphologies emitted the predominant emission peaks at 616 and 618 nm originating from the transition super(5)D sub(0) arrow right super(7)F sub(2) of Eu super(3+) ions under the excitation of 283-nm ultraviolet light. It was found that the optimum molar ratio of Eu super(3+)/(La super(3+)+Eu super(3+)) ions was 5 %. LaOCl:Eu super(3+) nanobelts exhibited the strongest PL intensity of the three morphologies under the same doping concentration. CIE analysis demonstrated that color-tuned luminescence can be obtained by changing doping concentration of Eu super(3+) ions and morphologies of nanomaterials, which could be applied in the fields of optical telecommunication and optoelectronic devices. The possible formation mechanisms of LaOCl:Eu super(3+) nanofibers, nanobelts and nanotubes were also proposed.

• Subject: Chlorination