Preparation And Optical Properties Of Zinc Oxide Nano Light-emitting Materials

Industry departments and domestic and international scientific circles have attached great importance to the research and development of nano ZnO, because it owns the advantages of both semiconductor oxide and nanometer materials.We studied the synthesis and the optical properties of ZnO:Sb3+ and ZnO:La3+,Li+, which provided theoretical and experimental basis to widly and well apply of nanomaterials. The contents of this paper were as follows:1.ZnO:Sb3+ with different Sb3+ doping concentrations, different calcining temperatures and calcining time were prepared by citric acid complexation-coprecipitation approach. The structure of all samples prepared belonged to hexagonal wurtzite phase, and the sizes all reached nano-grade. The research put an emphasize on the impact of doping concentration, calcining temperature, calcining time on the optical properties of ZnO:Sb3+Research results showed that morphostructures of ZnO:Sb3+ with different Sb3+ doping concentrations were elliptical and the sizes of the samples appeared the decreasing tendency with the increase of Sb3+ doping centration. Single hexagonal wurtzite phase of ZnO:Sb3+ nanophosphors were obtained when the doping concentration of Sb3+ was smaller than 2%, but if it exceeded 2%, XRD graph appeared diffraction peak of impurity phase. The emission peaks shapes of ZnO with Sb3+ and non-Sb3+ doped were almost the same, they maily existed two emission peaks, one was violet light near the center of 400nm and the other was blue light near the the center of 450nm. The strongest emission of the as-prepared samples were both at 450.8nm and 510.6nm when the Sb3+ doping content was approaching 2%, the calcination temperature and calcination time were fixed at 600℃and 4 hours, respectively. Meanwhile, calcining temperature and time played important roles on the intensity of blue light emission peak at 450.8nm.2.The structure of ZnO:La3+,Li+ nanopowders prepared with coprecipitation method, citric acid complexation-coprecipitation method, coprecipitation-high temperature solid-state method and hydrolysis precipitation-high temperature solid-state method all belonged to hexagonal wurtzite phase. Emphasize were put on the influences of crystal form and size of ZnO:La3+,Li+ on optical properties of the samples. The optical properties of ZnO:La3+,Li+ prepared with different methods were compared.Research results showed that ZnO:La3+,Li+ nanopowders prepared with different methods all belonged to hexagonal wurtzite phase. Single hexagonal wurtzite phase of ZnO:La3+,Li+ was synthesized with coprecipitation method. The size of ZnO:La3+,Li+ prepared by citric acid complexation-coprecipitation method was the smallest of the four preparation methods, it was about 95nm. All samples mainly had two emission peaks, violet light near the center of 400nm, blue light near the the center of 450nm and 466nm except the samples prepared with coprecipitation-high temperature solid-state method. A strong and wide green light emission peak near 500nm appeared and the blue light emission peak near 450nm disappeared in the samples prepared with the method of coprecipitation-high temperature solid-state method.