Preparation And Luminescent Properties Of Zirconia-based Rare Earth Luminescent Materials Via Emulsion Processing Route

In this article xylene, span-80, and water were first to form water in oil emulsion system, the emulsion of water-core will serve as the reactants micro-reactor. In the water nucleus of the emulsion, zirconium oxalate has a grain growth process, but zirconium oxalate grains grow up to water nuclear interface. Due to the oil and surfactant effect, the grain growth has been prevented.The Eu3+,Er3+ and Pr3+ doped Zr2O3 powders have been prepared by the emulsion processing route,and the effects of Eu3+,Er3+ and Pr3+ doping concentrations and sintering temperatures on phase structures and luminescences were systematically investigated by using x-ray diffraction(XRD), scanning electron microscope(SEM), fluorescence spectrum and x-ray photoelectron spectroscopy (XPS),to explore the emission mechanism of Eu3+,Er3+ and Pr3+ doped Zr2O3 powders.The fluorescence intensity ratio (FIR) technique based on Eu3+,Er3+ and Pr3+ doped Zr2O3 has been studied.The results are as follows:1. Analyze the prepared powder synthetically through a variety of test methods, including XRD, SEM, emission spectra, excitation spectra, Analyze the impact produced by sintering temperature and doping concentration on the phase of synthesis of ZrO2 nano-phosphor with XRD. Analyze the samples with the SEM photographs of powder morphology and particle size; Analyze the impact produced by different sintering temperature and different doping concentration on the emission intensity of synthesis of ZrO2 nano-phosphor with emission spectrum, to clarify the luminescence mechanism of the sample.2. Studying on ZrO2:Eu3+ nanocrystals emission spectra, after calcination at 1000℃, the 5Do→7F2 transition in sample emission spectra had "red shift" phenomenon. And splitting occurred at 608nm.Compared to the same doping concentration of ZrO2:Eu3+, phosphor with annealing temperature, the sample spectrum of emission intensity also increases following with annealing temperature increasing. By comparing the different doping concentration of ZrO2:Eu3+ phosphor emission spectra in the ZrO2,there was quenching phenomenon. The most appropriate doping concentration is lmol%(Eu3+/Zr3+). 3. Studying on the ZrO2:Er3+ nanocrystals emission spectra, there were two main emission peaks in emission spectra of samples, corresponding with a green emission center, corresponding to the 4S3/2→4I15/2 transitions.ZrO2:Er3+ samples in the green had two main launch:544nm (or 549nm) and 562nm.When the ZrO2 crystalline phase was different, the sample corresponding launch center also changed. When ZrO2 was tetragonal phase, the emission peak was 544nm and 562nm.When ZrO2 was monoclinic phase, the main emission peak was 540nm and 562nm.4. In this paper, ZrO2:Eu3+ nanocrystals are synthesized by three different sintering methods (pressureless sintering, SPS, no pressure sintering).Compared to their emission spectra, identify the best heat treatment at the same doping concentration and the same heat treatment temperature,...