Emulsion Method zirconia-based rare earth luminescent materials and luminescent properties of

Title: Emulsion Method zirconia-based rare earth luminescent materials and luminescent properties of
　　Author: Ye Liangheng
　　Degree awarded: Wuhan University of Technology
　　Keywords: rare earth doped;; zirconia;; emulsion;; Photoluminescence
　　Summary:
　　In this paper, xylene, span-80, and water to form water-in-oil emulsion system, the water in nuclear emulsion as a reaction to the micro-reactor. Emulsion of water in the nucleus, zirconium oxalate crystal growth process have, but when zirconium Neodymium magnets oxalate particles grow to the water nuclear interface, due to the oil and surfactant effects, prevent grain growth.
　　Using emulsion process prepared Eu3 +-doped and Er3 + and Pr3 + doped Zr2O3, X-ray diffraction (XRD), scanning electron microscopy (SEM), fluorescence spectroscopy and photoelectron spectroscopy (XPS) detection methods such as systematic studies of Eu3 +, Er3 + and Pr3 + doping concentration and sintering temperature on the doping Zr2O3 structure, and luminescence characteristics, revealing the doped Eu3 +, Er3 + and Pr3 +-doped light-emitting mechanism Zr2O3 system. Study based on Eu3 +, Er3 + and Pr3 +-doped Zr2O3 the fluorescence intensity ratio technique. The results are as follows:
　　1 through a variety of testing methods, including XRD, SEM, emission spectra, excitation spectra obtained for the preparation of a comprehensive analysis of powders, sintering temperature by XRD analysis and doping concentration on the synthesis of nano-ZrO2 powder with light effects; analysis of synthetic samples with the SEM images of powder morphology and particle size of the sample; of different sintering temperature, the samples of different doping concentration of luminous intensity, luminous sample to clarify the mechanism.
　　(2) of ZrO2: Eu3 + nanocrystals emission spectra under calcination at 1000 ℃, resulting in the emission spectrum of the sample 5D0 → 7F2 transition will happen "red shift" phenomenon. And in the split occurring at 608nm, compared with the doping concentration of ZrO2: Eu3 + luminescence powder, with the annealing temperature, the sample spectrum of the emission intensity also increases. By comparing the different doping concentrations of ZrO2: Eu3 + Phosphor emission spectra of Eu3 + in the ZrO2 found in quenching, the optimum doping concentration of lmol% (Eu3 + / Zr3 +).
　　3 of ZrO2: Er3 + nanocrystals emission spectra, emission spectra of samples in the two main emission peak, corresponding to the center with a green emission corresponding to the 4S3 / 2 → 4I15 / 2 transition, ZrO2: Er3 + samples in the green http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php part of a 544nm (or 549nm) and 562nm two main launch, when the crystalline phase of ZrO2 is not the same, the sample corresponding to the emission center also change, ZrO2 tetragonal phase, the emission peak of 544nm and 562nm, ZrO2 monoclinic phase, the main emission peak of 540nm and 562nm.
　　4 In this paper, three different sintering methods (pressureless sintering, SPS, non-pressure sintering) to get ZrO2: Eu3 + nanocrystals, compared to their emission spectra, identify the same doping concentration, the same heat treatment temperature, the most Strong emission spectra of the best heat treatment method.
　　Degree Year: 2010