Electrical And Optical Properties Of Er-doped BNT-based Multi-functional Ceramic Material

The enhance quality of social life makes people’s life comfort and convenient,but the rapid development of high-tech society also lead to the continuous energy consumption.People never stop the pace of the exploration of energy efficiency and versatility material.BNT as a lead-free material is getting much attention from many research scholars.Owing to its non-polluting,energy-saving and multi-functional characteristics,rare earth doped BNT-based ceramics are being study by many scholars.In this paper,we have tried different ways to find methods to improve the luminecent intensity of rare earth doped BNT matrix material.Rare earth Er3+ doped sodium bismuth titanate-based perovskite structure material was synthesised by conventional solid-state method and its microstructure,morphology and luminescent properties and electrical properties(ferroelectric,dielectric)were studied.Through the analysis of experimental data to explore the rare-earth doped perovskite material applications in photovoltaic system area.In order to study how to enhance the emission intensity of the material,the experiment work includes four parts:Explore the impact of different doping rare-earth manner to the luminescent properties of materials.That is a rare earth uniform and non-uniform doping effects on BNT:Er luminescence properties.The study found that the luminous intensity within a certain range of materials with increasing Er3+ concentration is enhanced,and the non-uniform doping luminous intensity is higher than the uniform doping material.Among them,in uniform doping,when x=0.02 material has an optimal luminescent property with no concentration quenching occurs;in non-uniform doping,the doping concentration reaches a maximum with x = 0.01,and concentration quenching occurs.Explore the impact of sintering aids on the luminescent properties.Study the type of sintering aids(Li2CO3,SiO2,B2O3)and its content effect on the luminescence properties of BNT:Er material.Experimental data show that all of sintering aids to some extent reduce the sintering temperature of the material(The sintering temperature is lowered to 100 degrees),in enhancing the emission intensity of the material only Li2CO3 can play a role.Explore doping different monovalent alkaline earth metal ions(M = Li+,Na+,K+)to BNT:Er luminescent properties of the material.Based on charge compensation principle,alkali metal ions can replace the A site atoms formed(Bi0.5Na0.5)1-xMxTiO3(M = Li+,Na+,K+).Experimental results show that the introduction of monovalent alkali metal ions can significantly increase the emission intensity of the sample and K+ ions is the best choice to increase the light intensity of the material.In order to explore the impact of morphotropic phase boundary on the light-emitting properties of the material,the paper also studied the rare-earth erbium-doped 0.94BNT-0.06BaxSr1-xTiO3(referred BNT-BST)material in both electrical and optical two areas properties.Study shows that material has a dielectric relaxation property,and found that the structure of the perovskite material has the best luminous intensity,the largest remnant polarization and the coercive field strength in the quasi-phase boundary.