Study On Fabrication And Flurescence Performance Of ZnO

The development of low-tension fluorescence materials of Field Emission Display and nanometer zinc oxide have been briefly summarized in the paper. Zinc oxide was thought to be a good low-tension fluorescence materials. But as low-tension fluorescence materials, it needs to be improved such as the surface form , luminescent efficiency and color purity. The characters of powder are connected with the inside structure and synthesize-technics of materials. In this paper, we want to search a optimize technics of materials synthesizing, and prepare a kind of nanosize powder which shape like ball and have good dispersed character. At the same time, we want to obtain a bridge structure of Zn-O-Tb through dopping of Tb, which can achieve efficient energy transfer from ZnO hosts to excited states of dopants, The doped powder can eradiate blazing green light because of efficient emission buildup from dopants and ZnO hosts, and the powder can emission a pure light. And we want to research the structure in doped ZnO for the further research of low-tension fluorescence of ZnO.We obtained ZnO powder by super grind , parallel flow precipitation- vacuum freeze drying and uniformity deposit. Using orthogonal experiments design , we obtained optimize technics of every way. Through Comparing the three ways, we find that uniformity deposit method is the most fit way in our search. The optimize technics of this way is: the concentration of nitrate zinc is 0.55mol/L, mol-proportion of reactant is 3.5/1, volume content of dispersant is 1%, reaction time is 3h, temperature of heat treatment is 350°C, time of heat treatment is 1 h. with this technics, we obtained pure nanometer ZnO powder which is 15 nanometer and ball shape.The change of heat treatment technics of ZnO before and after dopping have been studied. We found the temperature of heat treatment of precursor have changed after Tb doping, the reason is that the crystalloid fabric and crystal state of precursor have been changed through Tb doping. The fluorescence of pure ZnO powder was studied . the results showed that three emission peaks at 420nm,469nm and 588nm.We think the 420nm light comes from exciton die out,469nm light comesfrom transition of charge from transmit strap to znic lacuna, 588nm light comes from oxygen lacuna. The influence of different dopping content > ambience and heat treatment temperature on fluorescence was studied , and we found that efficient energy transferring from ZnO hosts to excited states of dopants was realized, it mean a bridge structure of Zn-O-Tb through dopping of Tb have come into being. But the help from the bridge structure is however smaller than that from Tb itself, the reason is the doping is not entire.