Ce-doped ZnO nanospheres and nanorods Preparation and Luminescence Properties

Title: Ce-doped ZnO nanospheres and nanorods Preparation and Luminescence Properties
　　Author: Zhao Qing
　　Degree-granting units: Northeast Normal University
　　Keywords: ZnO nanoparticles;; ZnO nanorods;; Solvothermal;; rare-earth ions
　　Summary:
　　ZnO is a direct band gap semiconductor light-emitting materials, at room temperature band gap of 3.37 eV, the exciton binding energy of 60meV, can be achieved at room temperature exciton emission. Nano-materials with bulk materials do not have many of the optical properties, its made ​​of optical materials will be widely used in daily life and high-tech fields. Neodymium magnets There are a lot of energy level structure of rare earth ions in the near UV and visible band, there are many features sharp lines, as light-emitting center is a better choice. Therefore, by doping rare earth ions to improve the luminescence properties of ZnO and want to get excellent light-emitting materials.
　　This solvothermal synthesized with smaller particle size of Ce-doped ZnO nanorods and ZnO nanoparticles, the preparation conditions of the two similar but different solvents, using ethanol as solvent, the product of the ZnO nanorods, using methanol as solvent the product compared with ZnO nanoparticles. Particle size of ZnO nanorods is about 10-20 nm, ZnO nano-particle size of about 20-30 nm. X-ray diffraction spectra show that incorporation of cerium ions makes the larger lattice constant of ZnO, the diffraction peaks move to small angle. By comparing the pure ZnO nanorods and Ce-doped ZnO nanorods UV - visible absorption spectroscopy that http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php doping samples exciton absorption peak of the obvious red shift. The more ZnO nanoparticles and Ce-doped ZnO nanoparticles UV - visible absorption spectrum is not found in samples doped with exciton absorption peak was red-shifted. Photoluminescence spectra from the point of view, Ce-doped ZnO nanorods and nano makes the ball visible light region increased. Ce-doped ZnO nanorods to the UV emission peak position red-shifted and Ce-doped ZnO nanoparticles to UV emission peak position does not move, the above results show that, Ce doping on the morphology of the different luminescence properties of ZnO nanoparticles influence.
　　Degree Year: 2010