The Study Of Opto-electronic Property Of Nanoscale Inorganic Materials & Application

Recently, the opto-electronic performance of nanoscale inorganic materials with surface effects and small-size effects were paid more attentions because of its potential application in micro-electronics, high power laser, biological labeling, large displaying and so on. Based on the preparation methods with the advantages of low temperature, little cost, easy control and green, nanoscale inorganic materials were synthesized. The electronic performance of mental oxides and optical capability of rare-ions doping compounds were investigated by the characterization techniques of Scanning electron microscopy (SEM), Transmission electron microscope (TEM), photo luminescence emission spectra (PL), Raman spectra, X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR) and keithley 4200. The main contents of this thesis focused on three aspects as following:1. The well-proportioned ZnO rods with 500 nanometers in diameter and more than 20 micrometers in length were prepared by hydrothermal methods. Some lattice defects such as oxygen vacancy were existed by the results of characterization. At the same time, the details of growth mechanism of ZnO would be provided.2. The element based on ZnO was fabricated by the means of dielectrophoresis. The element based on ZnO nanorods was fabricated by building certain numbers of ZnO nanorods through filtration of ZnO nanorods, preparation of Al counter-electrodes and the dielectrophoresis process. An excellent bidirectional rectifying effect was shown by the testing results. At the end, the mechanism of dielectrophoresis process would be discussed.3. The well-dispersed Sr5(PO4)3F:Nd3+ nanoparticles with about 60nm in length and 20nm in width were synthesized through pH cycling method at room temperature. The fluctuation of pH value, residence solution time in each pH and numbers of pH cycling were critical in the preparation of the Sr5(PO4)3F. The effect of annealing temperature on the morphology, lattice structure and fluorescent performance of the powder had been investigated. Fluorescence properties of the Sr5(PO4)3F:Nd3+ nanoparticles increased remarkably when promoting calcination temperatures and the fluorescence decay time of sample which annealed at 700℃was 330μS, which was also higher than some other S-FAP crystals, showing the suitability of nano-scaled Sr5(PO4)3F matrix as an efficient luminescent material. The mechanism of the reaction process was also taken into discussion.