Preparation And Properties Of Rare Earth Doped Perovskite Structure Luminescence And Catalytic Materials

Perovskite structural materials play an important role in the fields of the piezoelectric,ferroelectric,luminous,catalytic,magnetoresistance and other functional materials,which is a hot spot of materials science research.This paper focuses on the preparation of rare earth doped phosphorous and photocatalytic materials with perovskite structure and the related properties were studied.The main results are as follows:1.Preparation and research on the luminescent properties and photocatalytic performance of BaSiO₃:Eu²⁺ materials with perovskite structure.The BaSiO₃:Eu²⁺ were prepared by high temperature solid-state reaction and precipitation reaction.By contrasting luminescent properties of the phosphor materials,the results show that the BaSiO₃:Eu²⁺ phosphor made by high temperature solid-state reaction is 505 nm green light emission,while the sample prepared by precipitation reaction is 570 nm yellow light emission.It is demonstrated that the intrinsic emission of Eu²⁺ in the perovskite BaSiO₃ matrix is 570 nm yellow light emission,and the 505 nm green light emission reported in literature is derived from the luminescence of heterogeneous Ba2SiO4:Eu²⁺ generated during the high temperature solid-state reaction.Futhermore,we also studied the photocatalytic activity of BaSiO₃:Eu²⁺ materials with pure perovskite structure.The results show that its photocatalytic performance is low.2.Preparation and research on the luminescent properties of SrTiO₃:Pr³⁺/Eu³⁺ materials with perovskite structure.The SrTiO₃:Pr³⁺/Eu³⁺ phosphor were prepared by sol-gel method and their luminescent properties were studied.It is found that the excitation of Pr³⁺ in SrTiO₃:Pr³⁺ phosphor was due to the inter band absorption of matrix,the charge migration transition between Ti-O,and the defect level absorption,while the excitation of Eu³⁺ in SrTiO₃:Eu³⁺ phosphor material is derived from the effective energy transfer achieved by the non-radiation cross relaxation process between the charge transfer state,matrix and Eu³⁺ ions.3.Preparation and research on the photocatalytic properties of rare earth doped SrTiO₃ with perovskite structure.The Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb and Lu doped SrTiO₃ photocatalyst were prepared by sol-gel method and their photocatalytic properties were also investigated.It can be found that the catalytic performance of Y³⁺ doped SrTiO₃ photocatalyst was the best under the same conditions,and its utilization rate of light was up to 96%.Moreover,the effects of concentration change of Eu³⁺,preparation methods,pH values of the reaction solution and reaction atmospheres on the photocatalytic activity of Eu³⁺ doped perovskite structure SrTiO₃ were analyzed.The results are as follows: under the same conditions,the degradation rate of RhB for 0.08 mol Eu³⁺ doped SrTiO₃ was 70% after 160 min irradiation,while the photocatalytic activity for 0.02 mol Eu³⁺ doped SrTiO₃ prepared by sol-gel method with pH=5 and sintered in air showed better and degradation rate was 92%.