Preparation And Luminescence Properties Of Rare Earth-Doped MgO, ZnO, MoO₃Micro/Nanomaterials

In the study of micro/nano materials field, oxide micro/nano materials has the advantages of wide application in the photocatalytic degradation of organic pollutants, the field emitter, electron and light emitting devices etc, because of it’s simple structure, stable property, easy preparation.About the spectral properties of micro/nano oxides, it’s usually in an oxide matrix doped with rare earth ions to obtain rare earth micro/nano luminescent materials. A large number of studies show that, luminescent material and luminescent properties of morphology, size and different preparation methods are closely related, so people look for oxide doping different rare-earth ions of micro/nano luminescent materials in the use of simple method.The different morphologies of Eu3+and Eu3+、Gd3+incorporation into MgO luminescent materials is successful obtained by the hydrothermal method. And the special morphology of ZnO:Eu3+, six prismatic MoO3:Eu3+micro/nano luminescent material is prepared by the hydrothermal method. The morphology and structure of samples are characterized by electric microscopy scanning (SEM), X-ray diffraction (XRD), infrared spectrum (IR) and UV visible spectrum (UV-vis). The luminescent properties of the red phosphor are investigated by fluorescence spectra and color coordinates in detail.The analysis for the Eu3+and Eu3+, Gd3+doped MgO material show that the precursor prepared by different hydrothermal temperature and pH,after800℃calcination treatment get MgO:Eu3+with different morphologies cubic. The excitation MgO:Eu3+phosphor are composed of a broadband and a series of sharp peaks, the strongest excitation peak located at the395nm.And main emission peaks excitated by395nm located at597nm and617nm are attributed to5D0�'7F1magnetic dipole and5D0�'7F2electric dipole transitions of Eu3+,when the calcination temperature is800℃and amount of Eu3+doping is4%, MgO:Eu3+luminescence properties is the best.At the same time the results the luminescent intensity of Eu3+co-doped system is better than single Eu3+and indicated the influence of Gd3+ions for the luminescent properties of Eu3+ions doped MgO system,so Gd3+has very obvious sensitization effect for activator Eu3+.The different morphologies of ZnO:Eu3+luminescent material and MoO3:Eu3+luminescent material are prepared by the hydrothermal method.From the XRD and SEM results in the addition of surfactant SDBS ZnO:Eu3+are mostly fusiform shape, diameter150nm, length700nm; in addition of surfactant SDS preparation with an average diameter about400 nm, length of about700nm, six dispersed prismatic ZnO:Eu3+good luminescent material; preparation of a diameter of200nm without surfactant only through adjusting the pH value condition, length is600nm. six dispersed prismatic MoO3:Eu3+good luminescent materials.The strongest excitation peak are all located at465nm during the series of sharp lines in the excitation spectrum.So the emission spectra excited by465nm show intense red-emission, which corresponds to the5D0�'7F2transitions on Eu3+.When the temperature is160℃, the time is6h, ZnO:Eu3+show the highest luminescent intensity; When the temperature is150℃, the doping amount of Eu3+is4%, the time is7h,the MoO3:Eu3+show the highest luminescent intensity.In this paper, the preparation method is simple and easy to operate, the rare earth ions doped into different shapes of MgO, ZnO, MoO3micro/nano materials.It’s preparaed of good luminescent properties of oxide luminescent materials and provided information for further broadening the field of micro/nano oxide luminescent materials.