Design And Functional Application Of Ln³⁺doped Micro/nano Tungstate And Molybdate Luminescent Materials

Luminescence material is kind of functional materials,which can absorb outside energy and convert to effective optical radiation.Among these materials,the matrix materials of tungstate and molybdate with the introduction of lanthanides(Ln³⁺)has attracted tremendous attentions.Therefore,the tungstate and molybdate were chosen as the matrix for the doped of Ln³⁺ions.The optical materials with stable chemical properties and excellent optical performance were prepared and its applications of LED devices,luminescence films and ions detection were discussed in detail.The contents were as follows:?1?The synthesis of Bi₂MoO₆:Eu³⁺red phosphors.The samples were prepared via hydrothermal method in the assistance of PFr.The efficient Bi₂MoO₆:Eu³⁺red phosphors were prepared after the discussion of reaction conditions.?2?The synthesis and characterizations of multicolor BaMoO₄:Ln³⁺?Ln=Eu,Sm,Tb,Dy?phosphors.The structure and optical properties were discussed in detail via XRD,FTIR,Raman spectra,TG-DTA,PL spectra and UV-vis spectra.The best conditions of BaMoO₄:Ln³⁺?Ln=Eu,Sm,Tb,Dy?phosphors were obtained and the luminescence emission can be tunable from green to red by the changing of Ln³⁺dopants.?3?Strategy to enhance the red-emission of CaWO₄:Eu³⁺phosphors in the assistance of poly acrylic acid?PAA?.Results indicated that the red emission intensity was increased after the assistance of PAA,and the characteristic red emission peaks undergo a blue shift from 615 to 595nm.It was worth noting that the emission intensity increased about 8-times after blending of PAA with cationic solution.The structure,morphology and optical properties were discussed in detail by XRD,SEM,FTIR,PL spectra and UV-vis spectra.Importantly,the luminescent enhancement mechanism was discussed in detail.?4?The synthesis of CaMoO₄:Eu³⁺and its detection application in Fe³⁺and Cr₂O₇^2-ions.The samples were prepared via solid-state reaction in the assistance of Gum Arabic?GA?.The structure,morphology and optical properties were discussed in detail by XRD,SEM,FTIR,PL spectra and UV-vis spectra.Results indicated that the samples could be dispersed in aqueous and presented excellent selectivity and sensitivity on Fe³⁺and Cr₂O₇^2-ions.The Limits of detection?LOD?were 8.26?M,4.78?M,respectively.Importantly,the luminescence sensing mechanism was discussed in the paper.?5?Functional luminescence application and optical properties of emission tunable phosphors CaMoO₄@SiO₂:Ln³⁺?Eu,Tb,Dy?.Results indicated that the red emission intensity was obviously increased after the introduction of SiO₂.These samples were characterized using XRD,EDS,FTIR,SEM and PL respectively.The multicolor emission was obtained via the changing of Ln³⁺dopants,and the samples could be evenly dispersed in aqueous.Importantly,the functional application in luminescence film,LED devices and the detection of Cr₂O₇^2-ions were discussed in detail.