The Controllable Preparation And Optical Properties Of Low Dimensional Organic-inorganic Metal Halide

In recent years,the low-dimensional organic-inorganic metal halides have attracted much attention because of their wide application.The diverse chemical composition and tunable crystal structure give the material unique optical properties and chemical stability superior to traditional 3D perovskite compounds.These layered2D materials have interesting properties,such as high optical absorption coefficient,and long carrier diffusion length,making them suitable for many optoelectronic applications.0D organic-inorganic metal halides are widely used in solid lighting due to their high photoluminescence quantum yield and wide band emission with large Stokes shift.A variety of synthetic methods and the introduction of functional organic groups are used to design and synthesize new low-dimensional hybrid luminescent materials,so as to realize the functional optimization and controllable preparation of the structure and morphology of the materials.It is of great scientific significance to promote the practical application of such materials.However,most of researches are mainly focused on the design and synthesis of crystalline materials with different optical properties,and there is little research on the controllable preparation of the morphology and properties of such materials.We focus on the controllable preparation,optical properties and applications of low-dimensional organic-inorganic metal halides.The main research results are as follows:(1)The long alkyl chain 2D layered organic-inorganic hybrid perovskite was successfully prepared by the green method in solid phase grinding.The band gap and emission of 2D layered organic-inorganic hybrid perovskite can be accurately controlled by simply controlling the proportion of the halogen.The Mn-doped 2D layered hybrid perovskite was synthesized in situ by“one-pot”method in solid phase,and the orange light emission was obtained without high temperature treatment(the highest PLQYs 64.3%).The luminescence of Mn-doped(C₁₂H₂₅NH₃)₂Pb I₄ was realized to expand the emission range of the red light region.The blue light-driven white LED device-based Mn-doped(C₁₂H₂₅NH₃)₂Pb I₄was constructed.The color temperature was 5734K,and the color coordinate was(0.33,0.30),which showed good warm white light properties.(2)A novel 0D organic-inorganic hybrid metal halogen material(DTA)₂Cu₂I₄ with2D morphology was designed and synthesized.The mechanism of self-trapping exciton luminescence in the material is clarified by the results of the optical experiment and theoretical calculation.(DTA)₂Cu₂I₄ has good chemical stability and wide-band emission with large Stokes shift(PLQYs 60%).The two-component copper-based phosphor was prepared by simple,efficient and green"one-pot"method in solid phase grinding,and the Uv-driven white LED device with high color rendering index(85.7)was successfully constructed.(3)The 0D hybrid system consisting of long alkyl chain quaternary ammonium salt with strong van der Waals force was applied to the design of Sb-based luminescent materials.We have successfully prepared(DTA)₂Sb Cl₅·DTAC crystal material with double wide-band emission and 1D/2D morphology characteristics.It realizes the controllable preparation of 0D organic-inorganic hybrid metal halogen single crystal,which provides a reliable theoretical basis for the design and synthesis of 0D hybrid crystal with specific morphology.This material has a high PLQYs(90%).The combination of highly efficient self-trapping excitons luminescence and anisotropic morphology also gives the crystal excellent optical waveguide(the optical loss coefficient 0.0019 d B?m^-1)and linearly polarization emission properties(the polarization anisotropy 0.57),extending the application of 0D organic-inorganic metal halogen materials in optical communication micron-scale devices.