Preparation And Luminescent Properties Of Ce-doped ZnO Nanoparticles And Nano-rods

ZnO is a direct wide bandgap semiconductor light-emitting material. It is 3.37 eV of band gap at room temperature and 60meV of exciton binding energy. It can be achieved exciton emission at room temperature. Nano-materials have many of the special optical properties, which do not existed in bulk materials. The optical material will widely apply to daily life and high-tech fields. It can be applied to various fields. There are many energy levels in rare earth ion . There are many features sharp lines in the near ultraviolet and visible bands. It is a relatively good choice as the emission center. Therefore, it can improve the luminescence properties of ZnO by doping rare-earth ions. We hope that it obtain excellent light-emitting material.In this paper, we had synthesized Ce-doped ZnO particle size smaller nanorods and ZnO nanoparticles by solvothermal method. The preparation condition is similar but different solvents. With ethanol as solvent, the product is ZnO nanorods. It is used methanol as solvent the product of compared with ZnO nanoparticles. The size of ZnO nanorods is about 10-20 nm. The size of ZnO nanoparticles is about 20-30 nm. It is showed that ZnO dopes cerium ions make the lattice constant larger in X-ray diffraction spectra. The diffraction peaks move to small angle. By comparing the pure ZnO nanorods and Ce-doped ZnO nanorods, the exciton absorption peak appears obviously red-shift in UV - visible absorption spectra of the samples. In comparison Ce-doped ZnO nanoparticles and ZnO nanoparticles by UV - visible absorption spectra, we do not find that exciton absorption peak has significantly red-shifted in adulterated samples. From the photoluminescence spectra, Doped Ce makes visible light-emitting areas of the ZnO nanorods and nanoparticles rise. Ce-doped ZnO nanorods make UV light-emitting peak to red-shifted while the Ce-doped ZnO nanoparticles do not move. The above results show that Ce dop on the different morphologies of ZnO nano-particles affect the luminescence properties.