Synthesis And Characterization Of Rare Earth Doped ZnWO₄ Functional Nanomaterials

Due to the good properties of luminescence and structure, and the wide range of potential applications, metal tungstates have attracted much attention and become one of the focuses of research on inorganic materials in recent years. ZnW04 is a kind of excellent performance of photoluminescence or photocatalysis materials. In particular, the research on ZnWO4 or rare earth doped ZnWO4 nanomaterials has achieved fruitful results in recent years. In this paper, the work is maily focused on ZnWO4 nanomaterials. We got some ZnWO4 nanomaterials by a hydrothermal process and they have been studied by different fields. In this paper, the main research contents include as following:1)Dy3+ and Eu3+ co-doped ZnWO4 with different doping concentrations were synthesized by a hydrothermal method. The doping concentrations of Eu3+ could affect the blue and yellow emission intensities of Dy3+, and tunable emission color could be obtained by adjusting the doping concentrations of Eu+. Based on the excitation/emission spectra of Dy3+/Eu3+ co-doped ZnWO4 and the energy levels of Dy3+ and Eu3+, the photoluminescence of Dy3+/Eu3+ co-doped ZnW04 system was discussed. And the 4% Dy3+/1.25% Eu3+ co-doped ZnWO4 phosphor may have potential application in warm white light emitting diodes (W-LEDs).2)Er3+ -doped ZnWO4 nanorods with different doping concentrations were synthesized by a hydrothermal method. The as-prepared products were characterized by XRD, TEM and DRS. The effects of Er3+ doping on the photocatalytic activity of ZnWO4 were investigated. The sample with the doping concentration of 2 mol% exhibited the best photocatalytic performance. Our work indicates that the introduction of lanthanide ion could be a plausible strategy to develop efficient photocatalysts for environmental remediation and is worth to be extended to the preparation of other photocatalysts with high activity.3) Eu3+-doped ZnMoO4 were synthesized by a hydrothermal method. The effects of Eu3+ doping on the phase structure and photoluminescence (PL) properties of ZnMoO4 were investigated. With the increase of Eu3+ doping amount, β-ZnMoO4was transformed to a phase gradually, which led to different photoluminescence performances. The ZnMo04:6%Eu3+ exhibited the best photoluminescence performance, whose chromaticity coordinates were very close to the standard of NTSC. It is considered to be a promising red-emitting phosphor for white LED applications.