Abstract
Y2O3:Eu were prepared through precursors synthesized by leaching tests, removing impurities, enrichment of Y and Eu from residual purified liquors, annealing treatment, and high temperature solid-state reaction method, which is the most suitable for large-scale production. The analysis of product shows that the purity is 99.42%. The resultant powders were characterized by X-ray diffraction (XRD), differential thermal analysis (TG-DTA), scanning electron microscope (SEM), and photoluminescence (PL). Compared with the commercial phosphors, the XRD spectrum of the product samples revealed the synthesized particles to have a pure cubic Y2O3:Eu structure without any impurities in the crystalline phase. On the morphology, the Y2O3:Eu particles synthesized by a combustion and high temperature solid state process with sintering aids, were large and uniform. For luminescence property, the emission intensity of Y2O3:Eu phosphors synthesized by combustion process and high temperature solid state process with sintering aids were higher than those without sintering aids, at 1400 °C.
Highlights
Yttrium oxide doped with trivalent europium (Y2 O3 :Eu) phosphor—which have the characteristics of optics, electricity, and magnetism—are unsurpassed and non-renewable strategic resources, and have been extensively used in the field of electronic information, energy environment, petrochemical, and metallurgical machinery, especially in rare earth luminescent materials
In order to improve the leaching rate of Y and Eu, the effect of HCl concentration, the addition of hydrogen peroxide, the leaching temperature, and time have been discussed, and the results are shown in Figures 1–4, respectively
The leaching tests showed that the optimum condition of Y2 O3 :Eu by high temperature solid-state synthesis method
Summary
Yttrium oxide doped with trivalent europium (Y2 O3 :Eu) phosphor—which have the characteristics of optics, electricity, and magnetism—are unsurpassed and non-renewable strategic resources, and have been extensively used in the field of electronic information, energy environment, petrochemical, and metallurgical machinery, especially in rare earth luminescent materials. As much as eight thousand tons of waste fluorescent powders were produced in China in 2010; according to the current market value, rare earth resources in waste fluorescent powder are estimated to be about four billion. If the waste fluorescent powders were recycled efficiently, could it reduce the dwindling quantity of rare earth mineral, but it can be fused to the industrial chain of rare earth recovery, which could greatly improve the utilization of rare earth resources. In recent years, recycling of rare earth elements from waste fluorescent phosphors has been researched by many foreign and domestic researchers. Tsuyoshi Hirajima et al [2] used collecting agents and dispersants to separate rare earth trichromatic fluorescent phosphors by flotation method
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