Design,Synthesis And Application Of Tetravalent Manganese Ion Doped Polyfluorine(Oxygen) Compounds

With the continuous improvement of modern lighting technology,LED lighting technology has become the main force of modern lighting.In the selection of LED materials in the new era,the mainstream has the following choices:first,there is a good matching in the blue light region;The second is a mixture of white light with three primary light,that is,red,green and blue light;The third is that the emission intensity of the three colors should be high enough,and the emission peak should be as narrow as possible to avoid the occurrence of spectral reabsorption,resulting in the waste of energy.In this paper,the selection of red light materials is mainly introduced.As we all know,Mn⁴⁺has a very peculiar spectral phenomenon.It has an emission spectrum that can be excited in the blue region and an emission spectrum that can be obtained in the red region,and the emission intensity of both spectra is very high,both of which can reach the sixth power.All of these meet the above three principles of choosing luminescent materials,which indicates that tetravalent manganese ion as activator doped matrix can be used in LED market applications.Secondly,the new fluoride red phosphor doped with tetravalent manganese ions is slightly different from the doped matrix of previous years,and the necessary explanation is made on the possibility of its luminescence property and mechanism.The first chapter of this paper mainly introduces the formation principle of red light materials and the different synthesis methods of red light materials,and then introduces the commercial market analysis of LED and the way to realize white light LED.The second chapter mainly introduces the related experimental materials and equipment for the realization of red light materials,the experimental methods for the preparation of red light materials and the final analysis and characterization of red light materials.In chapter 3,a new red light material Ba₃Sc₂F₁₂:Mn⁴⁺with more than hexafluoride is introduced,and the substrate of the red light material can be obtained by adding the required raw material into the solution of hydrofluoric acid?mass fraction of 40%?by stoichiometric ratio at room temperature.At the same time,the fluorescence material is very consistent with the aforementioned optical advantages,including the extremely high color purity property;Secondly,the photoluminescence of BSF:Mn changes with the concentration of K₂Mn F₆,the reaction temperature and the concentration of NH₃·H₂O in the reaction system.Then it is introduced that partial replacement of Ba²⁺with Ca²⁺will reduce the luminous intensity of BSF:Mn.By using the prepared phosphor BSF:Mn as the red component,the low correlation color temperature?CCT?was 4796 K and the high color rendering index?CRI?was 85.2.Furthermore,BSF:Mn does not decompose at temperatures up to 800?.Therefore,this work demonstrates a strategy for exploring a new Mn⁴⁺doped fluoride with special thermal stability.In the fourth chapter,a novel compound containing oxygen and fluorine,Ba Nb OF₅:Mn⁴⁺was synthesized by hydrothermal method at room temperature.The synthesis raw material was prepared by the mixture of Ba F₂,Nb₂O₅ and K₂Mn F₆dissolved in HF solution.The influence of the synthesis temperature of the phosphor on luminescence and the influence on the material morphology were described in detail.Second,the red light emitted by the red material in the red region is extremely strong,and the color purity is also extremely high,up to 97.7%.Moreover,the thermal stability of the phosphor is also very excellent,which can be considered in future applications.In chapter 5,a new matrix Na HF₂ with simple molecular formula is described.Mn⁴⁺and Yb³⁺are doped in this matrix to realize Yb³⁺transferring part of the energy to Mn⁴⁺.The synthetic raw materials of Na HF₂:Mn⁴⁺,Yb³⁺luminescent materials are Na F,HF solution,K₂Mn F₆and Yb₂O₃.The synthesis of this material is intended to realize the transfer of the luminescent region of tetravalent manganese ions to the deep red region,so as to meet the demand of development of industry.