63 results about "Lead bromide" patented technology

The invention discloses a preparation method of a portable paper-based ratiometric fluorescence sensor APBA-CsPbBr3 at-UiO-66 / Ru, which comprises the following steps: 1, adding lead bromide and cesium bromide into N, N-dimethylformamide, then adding 5-bromovaleric acid and an oleylamine ligand, and stirring; 2, perfluorooctyltriethoxysilane is added, and a precursor solution is obtained; 3, adding zirconium chloride and terephthalic acid into N, N-dimethylformamide to obtain a homogeneous solution; 4, after heating, UiO-66 is obtained; 5, stirring the precursor solution, APBA, UiO-66 and tris (2, 2-dipyridyl) ruthenium chloride hexahydrate to obtain a composite material; and 6, dropwise adding the composite material solution into the filter paper. The APBA modified material is adopted as a recognition unit, the APBA modified material and the paper base construct a fluorescence sensing platform, visual quantitative analysis of oxytetracycline in water is achieved, and the device is convenient to carry, low in detection limit, high in anti-interference performance, easy and convenient to operate and suitable for on-site rapid detection of oxytetracycline.

The present application relates to a trace neodymium doped phenethylamine lead bromide monocrystal capable of simultaneously enhancing light yield and shortening decay time and application thereof, which solves the technical problem that the prior art is difficult to simultaneously improve light yield and shorten luminescence decay time. The trace neodymium doped phenethylamine lead bromide monocrystal capable of simultaneously enhancing light yield and shortening decay time is prepared by the following steps: 1) weighing; phenethylamine hydrobromide, lead bromide and neodymium bromide are weighed and placed in a glass bottle; the molar ratio of the phenethylamine hydrobromide, lead bromide and neodymium bromide is 2:1:(0.02-0.05); 2) obtaining a precursor solution; N,N-dimethylformamide is added to the glass bottle, heated and stirred until completely dissolved to obtain a precursor solution; 3) obtaining a crystal; the precursor solution is filtered and placed in a glass beaker for crystallization to obtain a neodymium doped phenethylamine lead bromide monocrystal; through adjustment of the crystal band structure by neodymium, the radiation recombination rate is improved.

The invention discloses a preparation method of a perovskite thin film, which comprises the following steps: carrying out vapor deposition on lead bromide on the surface of a substrate to obtain a lead bromide layer; and reacting the lead bromide layer with an organic salt to obtain the perovskite thin film. According to the invention, the vapor deposition technology is adopted to prepare the lead bromide precursor layer with high crystal quality and preferred orientation; the large-size and high-orientation lead bromide crystal grains provide an ideal reaction template for organic salt permeation, the prepared perovskite thin film is more complete in reaction compared with a traditional solution method, and the crystallinity and the crystal grain size are obviously improved; in addition, according to the process, auxiliary devices such as an anti-solvent and an air knife are avoided, the process flow is simplified, the problem of uncontrollable crystallization caused by the auxiliary devices is also avoided, and the repeatability of thin film preparation is improved.

The invention relates to a preparation method of a metal halide perovskite-coated three-dimensional cobalt porphyrin-based COFs (Covalent Organic Frameworks) composite material, which comprises the following steps: S1, reacting an aldehyde precursor with an amine precursor in a first organic solvent, and after the reaction is finished, performing post-treatment to obtain a three-dimensional cobalt porphyrin-based COFs material; wherein the aldehyde precursor is 5 ', 5 '', 5'' '', 5'' ''''-(5, 10, 15, 20-tetrayl) tetra (([1, 1': 3 ', 1 ''-terphenyl]-4, 4''-diformyl))-21H, 23H-cobalt porphyrin (II), and the amine precursor is 4, 4'-diamino terphenyl and 2 ', 5'-bis ((methylthio) methyl)-[1, 1 ': 4', 1 ''-biphenyl]-4, 4''-diamine; s2, in a second organic solvent, enabling the three-dimensional cobalt porphyrin-based COFs material to react with lead bromide, and after the reaction is finished, performing post-treatment to obtain a PbBr2 (at) 3D Co-COFs material; and S3, in a third organic solvent, carrying out a reaction on the PbBr2 (at) 3D Co-COFs material and methylamine bromide, and after the reaction is finished, carrying out post-treatment to obtain the metal halide perovskite (at) three-dimensional cobalt porphyrin-based COFs composite material. The preparation method has the advantage that the photocatalytic activity and stability are improved.

The invention discloses an ultraviolet-assisted silicon-coated perovskite quantum dot and a preparation method thereof, and belongs to the technical field of nano materials, and the ultraviolet-assisted silicon-coated perovskite quantum dot is prepared from lead bromide, octadecene, oleic acid, oleylamine, silane and a cesium source through a series of operation steps. According to the ultraviolet-assisted silicon-coated perovskite quantum dot and the preparation method thereof, the required raw materials are simple, the reaction condition is mild, the reaction is rapid, the product generation efficiency is high, the prepared perovskite quantum dot is small in size, silicon coating is complete, the crystallinity is excellent, the fluorescence performance is excellent, and the stability is improved.

This invention provides a microgap suspension device and a microgap inverted suspension heat treatment process, comprising the following steps: adding p-aminobenzenesulfonic acid to a solvent, mixing thoroughly, and then adding carbon nanotubes to obtain a carbon nanotube dispersion; stirring the carbon nanotube dispersion under heating conditions to obtain a p-aminobenzenesulfonic acid-modified carbon nanotube dispersion; coating a substrate surface with a lead bromide solution, then coating the lead bromide surface with a cesium bromide solution, then coating the cesium bromide surface with the p-aminobenzenesulfonic acid-modified carbon nanotube dispersion; and finally performing heat treatment through a microgap suspension device to form a photoactive layer film. The microgap inverted suspension heat treatment process of this invention, through controllable height suspension heat treatment, ensures that the film is almost unconstrained by the rigidity of the substrate during thermal expansion and cooling contraction, thus making it suitable for flexible substrates as well. It also avoids direct contact damage to flexible substrates during high-temperature heat treatment.

The invention belongs to the field of perovskite devices, and particularly discloses a bromine-chlorine mixed blue-light perovskite thin film, a preparation method and a perovskite LED device. The bromine-chlorine mixed blue-light perovskite thin film is prepared from the following raw materials: cesium halide, lead bromide, lead chloride and alkaline earth metal bromide; the alkaline earth metal bromide comprises at least one of calcium bromide, strontium bromide and barium bromide; the ratio of the mole number of the alkaline earth metal bromide to the total mole number of Pb in lead bromide and lead chloride is not greater than 0.5. The bromine and chlorine mixed blue light perovskite is doped by adopting the alkaline earth metal bromide with a low-solubility perovskite phase, and the molar ratio of the doping amount of the alkaline earth metal bromide is not higher than 0.5, so that the nonuniform bromine and chlorine distribution of the blue light perovskite thin film in the film forming process is improved, the halogen separation under an electric field is inhibited, and the spectral stability is improved; by directly doping in the precursor, the preparation process is simple, and the method is suitable for large-scale industrial production.

This application relates to a method for preparing Mn-doped CsPbBr3 nanowires. The method comprises: 1) injecting a cesium oleate precursor solution into a mixed solution A, dispersing the resulting precipitate by centrifugation in an oil-phase solvent, and obtaining a CsPbBr3 nanowire seed solution; 2) injecting the CsPbBr3 nanowire seed solution into a mixed solution B to form Mn-doped CsPbBr3 nanowires, cooling the solution, and centrifuging the resulting precipitate. Mixed solution A is prepared by mixing octadecene, oleic acid, oleylamine, and lead bromide, heating the mixture until the lead bromide is fully dissolved, and then cooling the mixture; mixed solution B is prepared by mixing octadecene and manganese bromide and heating the mixture under an inert gas atmosphere. This method provides sufficient thermal energy for the dopant while minimizing Ostwald maturity, allowing the dopant to diffuse into the crystal without the use of highly corrosive acids. While maintaining the nanowire's shape anisotropy and overall dimensional uniformity, it can produce nanowires with ultra-small diameters, making it an effective method for synthesizing Mn-doped CsPbBr3 nanowires.

The invention discloses a growth method of an organic-inorganic hybrid two-dimensional phenylethylamine lead bromide perovskite single crystal, relates to a growth method of a phenylethylamine lead bromide perovskite single crystal, and aims to solve the technical problems of long growth period and small thickness of the existing two-dimensional phenylethylamine lead bromide single crystal. The method comprises the following steps: 1, obtaining seed crystals; 2, thermodynamically regulating and controlling the solution supersaturation degree by a constant-temperature water bath device; 3, seed crystal growth is dynamically regulated and controlled through a seed crystal rotating-gradient cooling method under the solution rotating condition, the phenylethylamine lead bromide perovskite single crystal is obtained, the length and width of the phenylethylamine lead bromide perovskite single crystal are larger than 2 cm, the thickness of the phenylethylamine lead bromide perovskite single crystal is larger than 2 mm, fast neutron detection and high-energy nuclear particle screening can be met, and the phenylethylamine lead bromide perovskite single crystal is applied to the field of nuclear radiation detectors.

The application relates to a large-size orthorhombic phase bromine lead cesium single crystal and a solution growth method and application thereof, and belongs to the technical field of crystal materials. The application comprises the following steps: (1) mixing water and dimethyl sulfoxide uniformly, adding cesium bromide and lead bromide to obtain a bromine lead cesium solution; (2) overheating the bromine lead cesium solution at 70-80 DEG C for 24-48h to obtain a bromine lead cesium growth solution; and (3) growing the bromine lead cesium seed in the bromine lead cesium growth solution or spontaneously nucleating and growing under a sealed condition to obtain a large-size orthorhombic phase bromine lead cesium single crystal. The application uses a mixed solution of water and dimethyl sulfoxide as a solvent of cesium bromide and lead bromide for the first time, lets water participate in the growth of the bromine lead cesium crystal, changes the inverse temperature crystallization property of the CsPbBr3 crystal, changes the solubility of the CsPbBr3 crystal from an inverse temperature curve into a positive temperature curve, realizes the temperature-reducing controlled growth of the crystal, and effectively avoids the generation of other by-products of the bromine lead cesium.

The application discloses an X-ray detection composite material structure and a preparation method thereof. The composite material structure is composed of a conductive substrate (ITO glass), a nickel oxide (NiOx) nanostructure, a lead bromide formamidine (MAPbBr3) single crystal and an upper electrode. The preparation method comprises batching, a liquid phase reaction method and a solution method single crystal growth. The composite material structure prepared by the application can realize self-driven X-ray detection, that is, converts incident X-rays into current signals without an external bias voltage. The application has the advantages of low detection limit, wide detection energy range, high resolution, rapid response, good linearity and low manufacturing cost, and can be applied to X-ray detection, X-ray imaging, light sensors and many other fields.

The application relates to a large-size rare earth doped phenethylamine lead bromide perovskite monocrystal preparation method and perovskite monocrystal, and solves the technical problems that the preparation of the existing large-size rare earth doped two-dimensional perovskite monocrystal needs higher nucleation supersaturation, the preparation period is long, and part of the rare earth bromide is extremely easy to absorb moisture, thereby reducing the crystal quality. The large-size rare earth doped phenethylamine lead bromide perovskite monocrystal preparation method and perovskite monocrystal comprise the following steps: 1) weighing; phenethylamine hydrobromide, lead bromide and rare earth metal bromide are weighed and placed in a glass bottle; 2) obtaining a precursor solution; 3) obtaining a millimeter-level size crystal; 4) screening a seed crystal; and 5) seed crystal growth. In step 4), the open container B is placed at a preset temperature until the seed crystal continues to grow into a rare earth doped phenethylamine lead bromide perovskite monocrystal with a predetermined size, and the size can reach a centimeter level, which has an important supporting role in promoting the performance research of the rare earth doped two-dimensional perovskite monocrystal.

The application discloses alkali metal doped perovskite single crystal material and a preparation method and application thereof. A high-concentration alkali metal halide is introduced into a perovskite aqueous phase precursor, and an alkali metal doped perovskite single crystal is precipitated through a cooling method. The traditional cesium lead bromide perovskite light emitting wavelength band is near 520 nm, and wide spectrum emission cannot be realized. The scheme can prepare a centimeter level perovskite CsPb2Br5 single crystal with wide spectrum emission. Test results show that the alkali metal doped perovskite CsPb2Br5 single crystal fluorescence spectrum covers a visible light and near infrared light wavelength band (500-1000 nm).

The invention relates to a preparation method of Na+ / Cu2+ ions co-doped cesium lead bromide perovskite quantum dots, products and applications thereof, which belongs to the technical field of modification research of perovskite quantum dots. The invention discloses a preparation method of Na+ / Cu2+ ions co-doped cesium lead bromide (CsPbBr3) perovskite quantum dots, which adopts lead bromide (PbBr2), oleic acid (OA), oleylamine (OAm), sodium ion precursors and copper ion precursors for the reaction preparation in octadecene (ODE), in which copper ions (Cu2+) and sodium ions (Na+) substitute A and B crystal sites in cesium lead bromide (CsPbBr3) perovskite fluorescent quantum dots respectively. The quantum dots have been effectively improved in photoluminescence quantum yield, thermal stability, etc., and can be used as an active layer to fabricate light emitting diodes which achieve the tuning of emission color from green to blue.

The invention relates to the technical field of nano material preparation, and discloses formamidine acetate doped CsPbBr3 perovskite nanocrystals and a water phase preparation method thereof.The method comprises the steps that firstly, lead bromide, cesium bromide, formamidine acetate and dimethylacetamide are mixed, and a uniformly-doped precursor solution containing formamidine acetate is prepared under the ultrasonic concussion condition; sequentially adding oleylamine and 5-bromovaleric acid into the precursor solution according to a specific sequence, and carrying out ultrasonic-assisted in-situ surface ligand modification; and finally, rapidly injecting the precursor solution into deionized water, inducing crystallization by using the polarity difference of the solvent, centrifuging to remove the precipitate, and taking the supernatant to obtain the target product. According to the preparation method disclosed by the invention, the structural stability of the CsPbBr3 nanocrystal is remarkably improved through doping of formamidine acetate (FA) to a lattice A site and synergistic coordination of acetate. The obtained nanocrystal has a cubic crystal phase structure and can be stably dispersed in a water phase system, and the technical problem that a traditional perovskite material is easy to decompose when meeting water is solved.

The invention discloses a blue light CsPbBr3 superlattice and a preparation method and application thereof, and belongs to the technical field of perovskite material preparation. The preparation method comprises the following steps: in a ketone solvent, reacting 4-hydroxytetraphenylethylene, 1, 3-dibromopropane and potassium carbonate to obtain (2-(4-(3-bromopropoxy) phenyl) ethylene-1, 1, 2-triyl) tribenzene; in an alcohol solvent, reacting the product with trimethylamine to obtain N, N-dimethyl-N-(3-(4-(1, 2, 2-triphenyl vinyl) phenoxy) propyl) methyl ammonium; dissolving the ligand in a halogenated hydrocarbon organic solution to obtain a ligand solution; and sequentially adding the ligand solution and the cesium oleate solution into the lead bromide solution, and carrying out ion exchange reaction at normal temperature to obtain the blue-light CsPbBr3 superlattice. The tetraphenyl ethylene quaternary ammonium salt molecules are introduced, so that the stability and highly ordered self-assembly of the nanosheet are improved.

This invention provides a co-encapsulation method for highly stable perovskite quantum dots, comprising the following preparation steps: S1, mixing and grinding a low-crystallinity all-silica zeolite carrier, cesium bromide, and lead bromide to obtain a precursor mixture; S2, heating the precursor mixture to allow the cesium, lead, and halogen components to enter the pores of the low-crystallinity all-silica zeolite carrier, and crystallizing under the confinement of the pores to form CsPbBr3 perovskite quantum dots; S3, contacting the product obtained in step S2 with an aqueous potassium chloride solution and performing hydrothermal treatment to obtain zeolite-encapsulated CsPbBr3 perovskite quantum dots containing lead hydroxide chloride. This invention can reduce the adverse effects of chlorine sources on direct halogen exchange in the perovskite quantum dot bulk lattice and promote the participation of chlorine sources in the formation of a stable protective structure at the carrier interface, thereby improving the stability of perovskite quantum dots.

The invention relates to a miRNA fluorescent nanoprobe based on hydrophilic inorganic cesium-lead-bromine perovskite as well as a preparation method and sensing application of the miRNA fluorescent nanoprobe, and belongs to the technical field of biosensing. The preparation method comprises the following steps: firstly, respectively dispersing two hydrophilic inorganic cesium-lead-bromine perovskite nano-materials in a solution, respectively modifying ssDNA to the surfaces of the two hydrophilic inorganic cesium-lead-bromine perovskite nano-materials through amidation reaction, and finally, reacting with MnO2 nanosheets, so as to construct Cs4PbBr6 / CsPbBr3-Mn NCs-ssDNA / MnO2 and Cs4PbBr6 / CsPbBr3-Mn NCs-ssDNA / MnO2 fluorescent nano-probes, i.e., Cs4PbBr6 / CsPbBr3-Mn NCs-ssDNA / MnO2 fluorescent nano-probes. The method is applied to quantitative detection of two miRNAs in the field of biosensing. Compared with other detection methods, the synthesis method of the inorganic cesium-lead-bromine perovskite nanoparticles used in the method is simple and rapid, complex surface group modification is not needed, and simultaneous detection of the two miRNAs can be achieved. In addition, the method is successfully applied to analysis and detection of miRNA-21 and miRNA-10b in a serum sample and a tumor cell lysis solution.

The application relates to the technical field of X-ray scintillator materials, in particular to an organic-inorganic hybrid lead halide scintillator as well as a preparation method and application thereof, the preparation method comprising the following steps: adding n-heptyltriphenylphosphonium bromide and lead bromide into a glass bottle, then adding N,N-dimethylformamide, heating and stirring until complete dissolution to obtain a precursor solution; placing the obtained precursor solution at room temperature until white block crystals appear at the bottom of the glass bottle; taking out the obtained crystals, washing with ultrapure water, and vacuum drying to obtain a scintillator. The scintillator prepared by the above steps has excellent thermal stability and has no obvious degradation below 305 DEG C; the linear response interval of the scintillator during X-ray imaging spans three orders of magnitude, meaning that the detection range of the scintillator is relatively wide, and the scintillator has great application potential in the field of X-ray imaging.

A two-dimensional (2D) perovskite superlattice and methods of formation are disclosed herein. The perovskite superlattice includes a layered structure with alternating inorganic (lead-bromide sheets) and organic components (FBTT, FBTP, PBTP, and BBTP) that creates a reversed type-I band alignment. The superlattice structure enables the formation of SMA, which combine properties of both single molecules and aggregates.

The invention relates to an additive modified perovskite light absorption layer material, a preparation method and a perovskite solar cell, the perovskite light absorption layer material comprises a perovskite precursor liquid and an additive solution, and the content of the additive solution in the perovskite light absorption layer material is 3%-5%; the perovskite precursor liquid is prepared from the following components: formamidine hydriodate, cesium iodide, methylamine bromate, lead bromide and lead iodide, and the molar ratio of the components is (0.9 to 1.1) to (0.05 to 0.1) to (0.1 to 0.3) to (0.1 to 0.3) to (1 to 1.3); the additive solution is prepared from the following components: isoamyl amine hydriodate, methylamine iodine and lead iodide; the molar ratio of all the components is (0.2 to 0.5): (0.6 to 0.8): (1 to 1.2); the crystal quality of the perovskite thin film can be optimized, the generation of defects is reduced, and the photoelectric property and the stability of the cell are improved.

The present application relates to a kind of sulfonate ligand modified perovskite quantum dots, belong to perovskite quantum dot technical field.It includes the following steps:S1: cesium source, octadecene and oleic acid are mixed, vacuum drying is carried out, inert gas is passed and heated, and first mixed solution is obtained;S2: lead bromide, octadecene, oleylamine, oleic acid and octylamine methyl sulfonate are mixed, vacuum drying is carried out, under inert gas heating, first mixed solution is further added, after reaction, quenching, purification, and the solution of the sulfonate ligand modified perovskite quantum dots is obtained.The present application uses octylamine methyl sulfonate multi-ligand to passivate perovskite quantum dots in the process of quantum dot preparation, effectively reduces the vacancy defects caused by the increase of surface area due to the size reduction in the process of quantum dot synthesis, strengthens the combination between ligand and quantum dot, makes the particle size of quantum dot more uniform, and further improves the luminescent performance and stability of perovskite quantum dots.

The invention belongs to the technical field of crystals, and discloses a spodumene epoxy resin film and a preparation method and application thereof. The spodumene synergistic adhesive comprises the following raw materials in parts by mass: 1-3 parts of pretreated spodumene, 0.1-0.15 part of synergistic particles, 10-20 parts of epoxy resin AB glue and 0.1-0.15 part of a toughening agent. Wherein the pretreated spodumene is spodumene powder modified for 1-4 hours in the atmosphere of argon and hydrogen mixed gas at 200-500 DEG C; the synergistic particles are prepared from lead bromide, europium chloride hexahydrate, terbium chloride hexahydrate, 1-octadecene, zinc acetate dehydrate, 2-methylimidazole and a silane coupling agent KH-560. The introduction of the pretreated spodumene and the synergistic particles effectively improves the X-ray imaging resolution, the size stability and the luminescence uniformity of the epoxy resin film. Therefore, the method has a wider application prospect in the field of three-dimensional X-ray imaging.

The invention relates to a technology for preparing a perovskite quantum dot diffusion plate through in-situ polymerization. The technology comprises the following steps that 1, an AB precursor, cesium carbonate, lead bromide and ODE are prepared according to the ratio of 1: 1: 10 and then heated to 285 DEG C to be dissolved; 2) preparing an X precursor: respectively dissolving NaBr or NaI in ODE, wherein the mass ratio of the addition amount of NaBr or NaI is 10%; (3) adding the AB precursor into PS, heating and stirring at 90 DEG C, uniformly mixing, adding the X precursor, and continuously stirring to obtain a mixture; 4, the mixture is subjected to melt extrusion in a single-screw extruder, and the perovskite quantum dot diffusion plate is obtained.The prepared product has the advantages of being high in fluorescence quantum efficiency, narrow in half-peak width (smaller than or equal to 25 nm), wide in color gamut (larger than or equal to 127% of the NTSC standard), high in chromaticity uniformity (delta X and delta Y are both smaller than or equal to 0.01) and the like.

The invention discloses a preparation method of a bromine lead deuteride methylamine perovskite single crystal, and belongs to the technical field of crystal growth. The preparation method comprises the following steps: performing multiple deuteration on bromomethylamine, performing heavy water separation and recovery on a mixed solution containing bromomethylamine and heavy water generated after each deuteration, and synthesizing a bromine lead methylamine deuteride single crystal. Bromomethylamine and heavy water are subjected to multiple times of deuteration in a certain proportion to generate bromomethylamine deuteride, then bromomethylamine deuteride and lead bromide are subjected to inverse temperature crystallization in an organic solvent, and the bromolead deuteride methylamine perovskite single crystal is synthesized. The preparation method provided by the invention has the advantages that the synthesis process is efficient, safe and controllable, heavy water can be recycled, the synthesis cost is greatly reduced, and the stability of the synthesized bromine lead deuteride methylamine perovskite single crystal is greatly improved.

This invention discloses a method for preparing and applying a two-dimensional lead bromide perovskite single crystal based on 1-amino-4-methylpiperazine in the Dion-Jacobson phase, wherein the chemical formula of the single crystal is (C5H). 14 N3)PbBr4, where C5H 14 N3 2+ It is a diprotonated 1-amino-4-methylpiperazine cation; single-crystal X-ray diffraction analysis shows that it has a typical two-dimensional Dion-Jacobson phase layered structure, belongs to the monoclinic crystal system, space group P21 / n, and its structure is dominated by [PbBr4]. 2‑ The single crystal is constructed by alternating stacks of octahedral inorganic layers and diammonium cation organic layers. The preparation method involves: first, dissolving 1-amino-4-methylpiperazine in hypophosphite and lead oxide in hydrobromic acid; then mixing the two solutions and heating them at 100-130°C to form a homogeneous precursor solution; finally, obtaining the single crystal through a programmed slow cooling method. This invention utilizes hydrobromic acid as a medium to achieve precise protonation of organic amines and a high-concentration bromine environment. The resulting single crystal exhibits high crystal quality and good stability, demonstrating significant application potential in optoelectronic fields such as polarization detection, nonlinear optics, and light-emitting devices.

The invention discloses a preparation method of a one-dimensional cesium-lead-bromine nanowire film, a film material, an element and equipment. The preparation method comprises the following steps: preparing a first solution containing a proper amount of acetone, toluene and a surfactant; weighing lead bromide and cesium bromide in a molar ratio of 1: 1, and grinding into uniform powder; in a constant-temperature water bath, adding the powder into the first solution, and stirring for reaction; after the reaction is finished, separating and washing to obtain a pure cesium-lead-bromine nanowire; dispersing the cesium-lead-bromine nanowires in a mixed solvent of normal octane and normal hexane to obtain a nanowire dispersion liquid required for preparing the thin film; and coating the nanowire dispersion liquid on a substrate, and drying at room temperature to obtain the uniform one-dimensional cesium-lead-bromine nanowire film with high polarization luminescence and polarization response. According to the invention, the preparation process of the one-dimensional cesium-lead-bromine nanowire film is optimized, and the preparation of the macroscopic orientation cesium-lead-bromine nanowire film with high polarization luminescence and polarization response is realized, so that the preparation of an optical device with good anisotropy and polarization performance is realized.

The invention discloses an ionic liquid modified perovskite light absorption layer and a preparation method and application thereof, and belongs to the technical field of solar cells. The preparation method comprises the following steps: dissolving cesium iodide, methyl ammonium bromide, formamidine hydriodate, lead iodide and lead bromide in N, N-dimethylformamide and dimethyl sulfoxide; adding 1-butyl-2, 3-dimethylimidazole p-methyl benzene sulfonate into the solution, and stirring to form a mixed solution; and spin-coating the mixed solution on a substrate, spin-coating chlorobenzene, and finally annealing to obtain the perovskite light absorption layer. According to the invention, nitrogen atoms in positive ions of 1-butyl-2, 3-dimethylimidazole p-methyl benzene sulfonate are combined with uncoordinated Pb < 2 + > defects in perovskite through lone pair electrons, so that surface defects of perovskite are effectively passivated. The efficiency of the hybrid perovskite solar cell is improved to 22.57%, the surface of the thin film is cleaner, the defect state density is reduced, and the stability is remarkably enhanced.

The application relates to the technical field of perovskite materials, and discloses a perovskite light-emitting diode based on ferrocene formic acid modification and a preparation method thereof, the preparation method comprises the following steps: repeatedly cleaning an ITO substrate with deionized water, ethanol and dichloro, and then cleaning the substrate by using an ultraviolet ozone machine; depositing a PEDOT:PSS solution on the surface of the substrate obtained in step 1 in a rotary coating mode, and then performing annealing treatment; dissolving ferrocene formic acid into chlorobenzene, stirring the solution until the solution is dissolved to obtain a mixed solution, depositing the mixed solution on the surface of the substrate obtained in step 2 in a rotary coating mode, and then performing annealing treatment; and dissolving lead bromide, cesium bromide, phenethylammonium bromide and crown ether into a mixed solution of DMSO and PVP. The quasi-two-dimensional perovskite thin film prepared by the application has high light-emitting color purity and high quantum efficiency, and the prepared perovskite light-emitting device has high light-emitting performance and high stability.

The application belongs to the field of perovskite devices, and specifically discloses a bromine-chlorine mixed blue light perovskite film, a preparation method thereof and a perovskite LED device. The preparation raw materials of the bromine-chlorine mixed blue light perovskite film include cesium halide, lead bromide, lead chloride and an alkaline earth metal bromide; the alkaline earth metal bromide includes at least one of calcium bromide, strontium bromide and barium bromide; and the ratio of the mole number of the alkaline earth metal bromide to the total mole number of Pb in the lead bromide and the lead chloride is not greater than 0.5. The alkaline earth metal bromide with a perovskite phase of low solubility is used to dope the bromine-chlorine mixed blue light perovskite, and the mole ratio of the doping amount of the alkaline earth metal bromide is not higher than 0.5, so that the uneven distribution of bromine and chlorine in the blue light perovskite film during the film forming process is improved, the halogen separation under the electric field is inhibited, and the spectral stability is improved; the doping is directly performed in the precursor, the preparation process is simple, and the method is suitable for large-scale industrial production.