Journal Article

Controlled synthesis and tunable photoluminescence properties of LaOBr:Eu super(3+) nanostructures

Ma, Wenwen, Liu, Guixia, Yu, Wensheng, Dong, Xiangting, Wang, Jinxian

2014

Overview

Eu super(3+) doped lanthanum oxybromide (LaOBr) nanostructures including nanofibers, nanoribbons, and hollow nanofibers were fabricated for the first time via calcining the electrospun PVP/[La(NO sub(3)) sub(3)+Eu(NO sub(3)) sub(3)+NH sub(4)Br] composites. X-ray diffraction analysis results showed that LaOBr:Eu super(3+) nanostructures were tetragonal in structure with space group of P4/nmm. The morphologies and sizes of the LaOBr:Eu super(3+) nanostructures were studied by scanning electron microscope and transmission electron microscope. The mean diameter of the nanofibers and hollow nanofibers, and the width of nanoribbons are 118.02 plus or minus 14.21, 115.84 plus or minus 13.37 nm, and 1.56 plus or minus 0.25 mu m, respectively. Under the excitation of 289 nm ultraviolet light, LaOBr:Eu super(3+) nanostructures exhibit the red emissions of predominant peak at 618 nm, which is ascribed to the super(5)D sub(0) arrow right super(7)F sub(2) transition of the Eu super(3+) ions. It is found that the optimum doping concentration of the Eu super(3+) ions in the LaOBr:Eu super(3+) nanofibers is 5 %. Interestingly, we found that the luminescence intensity of nanofibers is obviously greater than that of the hollow nanofibers and nanoribbons for LaOBr:Eu super(3+) under the same measuring conditions. Moreover, the color emissions of LaOBr:Eu super(3+) nanostructures can be tuned by adjusting the concentration of Eu super(3+) and the morphologies of nanomaterials. The obtained LaOBr:Eu super(3+) nanostructures may be promising nanomaterials for applications in the fields of light display systems and optoelectronic devices.

• Subject: Electrospinning