Preparation Of Upconversion Materials Based On Improving Solar Cell Efficiency And Study On Light Absorbing Layer

In recent years,rare earth upconversion luminescent materials have been involved in various fields such as solar cells,information industry,energy-saving lighting,and medicine,and have become the focus of current research.It is particularly important to find new and highly efficient rare earth upconversion luminescent materials.Molybdate ARE?MoO₄?₂ as a matrix material has the advantages of low phonon energy,reduced loss due to non-radiative transition,and stable physical and chemical properties.Therefore,this paper chooses to study the up-conversion of rare earth doped sodium bismuth molybdate.Luminous characteristics,the main research contents are as follows:Perovskite solar cells are considered to be one of the most promising batteries due to their high conversion efficiency,simple preparation process and low cost.The highest conversion efficiency has reached 22.1%.For perovskite solar cells,it is important to prepare high-quality perovskite films.The solution method is widely used due to its advantages such as simple process,low manufacturing cost,low energy consumption and environmental friendliness.In this paper,CH₃NH₃PbI₃ perovskite film was prepared by one-step spin coating method and two-step solution method.The crystal structure and shape of perovskite film were studied by XRD,SEM,spectral analysis and data analysis.The influence of appearance,grain size and light absorption performance.Two series of NaGd?MoO₄?₂ phosphors doped with Tm³⁺/Yb³⁺and Ho³⁺/Yb³⁺were prepared by hydrothermal method.By analyzing its spectrum,NaGd?MoO₄?₂:xTm,5Yb?x=0.5,1,2?has two emission peaks of blue?477nm?and red?672nm?under 980nm laser irradiation,and with As the Tm³⁺doping concentration increases,the luminescence intensity gradually decreases.NaGd?MoO₄?₂:xHo,5Yb?x=0.5,1,2?has a green?546nm?emission peak and a red?661nm?emission peak under 980nm laser irradiation,and with the doping concentration of Ho³⁺increasing,the lower the luminous intensity.NaGd?MoO₄?₂:0.1Ho³⁺,1Tm³⁺,xYb³⁺?x=5,10,15,20,30?were prepared by hydrothermal method.Under the irradiation of 980 nm laser,the color coordinate of the sample NaGd?MoO₄?₂:0.1Ho/1Tm/20Yb was?0.3398,0.2761?,which was in the white light region.Preparation of NaGd?MoO₄?₂:0.1Ho³⁺,1Tm³⁺,xYb³⁺?x=5,15,20,30?by high temperature solid phase method,NaGd?MoO₄?₂:0.1Ho³⁺,1Tm³⁺by up-conversion spectroscopy and CIE color coordinate analysis The color coordinates of 20Yb³⁺are in the white light region,providing a new implementation for white LEDs.