59results about "Lead compounds" patented technology

The invention discloses a mixed ligand modified cesium lead halide perovskite nanocrystal and a preparation method thereof, and the preparation method comprises the following steps: (1) adding CsBr and PbBr2 in an equal molar ratio into a P-AMDL polymer solution to obtain a CsPbBr3 precursor solution; (2) injecting the precursor solution into a toluene solvent, and then settling and purifying by using an n-hexane solvent to obtain a P-AMDL modified CsPbBr3 solution; (3) introducing an oleic acid oleylamine ligand to obtain CsPbBr3 modified by a mixed ligand; and (4) optimizing an ion exchange method by combining a mixed ligand strategy to obtain the mixed ligand modified CsPbBrxI3-x. According to the invention, the problem of wide particle size distribution of nanocrystals synthesized by an LARP method at room temperature is solved, and the all-inorganic cesium-lead halide perovskite nanocrystals with fewer defects, more regular morphology and better ultraviolet stability are successfully prepared. The'micromolecule + polymer 'mixed ligand strategy gives consideration to the regulation and control precision of the micromolecule ligand and the stability of the polymer ligand, and is an effective means for optimizing the morphology and performance of the perovskite nanocrystal.

The invention belongs to the technical field of heterostructure construction, and particularly relates to a SnS2 / CsPbBr3 heterojunction as well as a preparation method and application thereof. The preparation method of the SnS2 / CsPbBr3 heterojunction comprises the following steps: taking a hexagonal 2D SnS2 nanosheet synthesized by a hydrothermal method as a growth template, combining with a 3D CsPbBr3 nanocube synthesized by a solution method, and successfully constructing the 2D / 3D SnS2 / CsPbBr3 heterojunction through an electrostatic self-assembly technology. The invention innovatively provides a heterojunction preparation strategy aiming at the problems of serious interface charge recombination, low photoresponse efficiency and the like of a metal halide perovskite material. Through an electrostatic self-assembly technology, a 2D / 3D SnS2 / CsPbBr3 heterojunction system is successfully constructed, and the problems of serious interface recombination, low light response rate and the like of metal halide perovskite in photoelectric application are successfully broken through.

The present invention is directed to an antimicrobial substrate having a layer of PbTe quantum dots (QD) attached to an outer surface of the material. Further provided is a method of fabrication the substrate / modification of a material for obtaining an antimicrobial surface.

The present invention pertains to: a method for forming a large-area perovskite thin film, whereby a uniform, large-area perovskite thin film can be manufactured without using an anti-solvent; a coating agent used in said method; and a perovskite solar cell including said perovskite thin film as a light absorption layer.

This invention provides a method for 226 Ra and 210 This invention relates to the field of radioactive ion extraction and separation, specifically a composite membrane for Pb separation, its preparation method, and its applications. The method includes the following steps: mixing polyacrylonitrile, crown ether, and an ionic liquid to obtain a spinning solution; spinning this solution to form a composite membrane. This invention enables the separation of Pb from uranium ore digestion solutions. 226 Ra and 210 The effective extraction and separation of Pb reduces radioactive pollution in the environment and enables the recycling of environmental resources. At the same time, the preparation method is simple and low-cost, and the resulting composite membrane is non-toxic and harmless, which is conducive to industrial application.

To provide an ionic crystal using a new method that can further improve the heat resistance of the ionic crystal. [Solution] A surface-coated ionic crystal in which the surface of an ionic crystal is coated with a first polymer containing a first repeating unit which is a repeating unit having two or more zwitterionic structures in its side chain portion, and a second polymer containing a second repeating unit which is a repeating unit having only one zwitterionic structure in its side chain portion.

The invention discloses a method for mildly preparing a fluorine ion solid electrolyte, and belongs to the technical field of fluorine ion batteries. The method comprises the following steps: (1) selecting raw materials in a corresponding stoichiometric ratio according to a chemical formula of the fluorine ion solid electrolyte, and carrying out ball milling treatment on the raw materials to obtain mixed powder; the chemical formula of the fluorine ion solid electrolyte is CsPb < 1-x > M < x > F < 3-x > or RbPb < 1-x > M < x > F < 3-x >, m is Li, Na or K; the value range of x is 0 to 0.7; and (2) carrying out low-temperature heat treatment on the mixed powder at 100-300 DEG C until the reaction is completed to obtain the fluorine ion solid electrolyte. Through the specific formula design and the low-temperature annealing technology, the technology limitation of a traditional method is overcome, kilogram-level product preparation is achieved, and the technology is suitable for large-scale large-batch production. The prepared fluorine ion solid electrolyte has excellent comprehensive performance, and has a wide application prospect in the fields of rechargeable fluorine ion batteries and the like.

The invention discloses a low-threshold adjustable micro white light laser based on a perovskite micron sheet and a preparation method of the low-threshold adjustable micro white light laser in the field of semiconductor lasers. The low-threshold adjustable micro white light laser based on the perovskite micron sheet comprises a gain medium, the gain medium is an Erx: CsPbyClaBrbIc micron sheet, x + y = 1, a + b + c = 3, and x, y, a, b and cgt; 0; the Erx: CsPbyClaBrbIc micron sheet is of a Cl, Br and I halogen phase separation structure induced by Er < 3 + >, a stable three-phase pinning energy band is formed, and red laser, green laser and blue laser can be emitted at the same time. According to the low-threshold adjustable micro white light laser based on the perovskite micron sheet and the preparation method thereof, fine adjustment of chromaticity and color temperature can be achieved by adjusting halide composition, and the low-threshold adjustable micro white light laser has the advantages of being simple in preparation process, excellent in performance and high in stability.

The application belongs to the technical field of perovskite quantum dot material preparation, and relates to a perovskite aerogel yarn and a preparation method and application thereof. The preparation method comprises the following steps: mixing a silicon source, a weak alkaline catalyst, a mesoporous template and deionized water to react, and then performing washing and drying treatment to obtain a nano mesoporous SiO2 material; mixing and stirring the nano mesoporous SiO2 material with a fluorine source, a cesium source, a bromine source, a lead source and deionized water to obtain a precursor dispersion liquid; the precursor dispersion liquid is dried, calcined, washed, dried and ground to obtain fluorine-modified perovskite@SiO2 light-emitting particles; the fluorine-modified perovskite@SiO2 light-emitting particles are sprayed and coated on a nanofiber membrane, and then twisted, soaked and dried to form a perovskite aerogel yarn material. The material can still maintain high brightness and stable light-emitting performance under extreme environments such as 200 DEG C high temperature or humidity and water immersion, and significantly expands the application range of light-emitting fabrics.

The application discloses a method for improving water stability of a cesium-bismuth-bromine system quantum dot by using dendritic organosilicon molecules, and the method comprises the following steps: taking Cu2O as a catalyst, blending chloropropyl trimethoxysilane, ethylene glycol and liquid ammonia, and then reacting; after multiple rotary evaporation purifications, 3-aminopropyl trimethoxysilane is separated; Cs3Bi2Br9 QDs precursor liquid and 3-aminopropyl trimethoxysilane are added drop by drop into a mixed solution of oleic acid and anhydrous ethanol respectively, heating and vigorous stirring are conducted to obtain a colloidal solution; after the colloidal solution is cooled to room temperature, centrifugation is conducted, and the precipitate at the bottom is filtered to obtain a colloidal solution of Cs3Bi2Br9 QDs based on 3-aminopropyl trimethoxysilane in-situ modification. The application rapidly synthesizes a high-purity dendritic 3-aminopropyl trimethoxysilane under mild conditions through an intermediate, and further uses the 3-aminopropyl trimethoxysilane to modify Cs3Bi2Br9 QDs to improve water stability of the Cs3Bi2Br9 QDs.

A method of fabricating a halide perovskite having a general formula of ABX3, wherein A, B, and X are inorganic elements and X is a halide, the method including a vapor-liquid-solid process triggered by a catalyst formed from a noble metal; A nanowire of the halide perovskite and a photoelectronic device thereof.

This application relates to a method for preparing CsPbBr3 nanosheet materials and their applications. The method includes: mixing cesium carbonate, oleic acid, and an oil-phase solvent, and stirring and heating under an inert gas atmosphere until the solution becomes clear, obtaining a cesium precursor solution; mixing octadecene, oleic acid, oleylamine, and lead bromide, heating until the lead bromide is completely dissolved, and then cooling to 22°C to obtain a mixed clear solution; injecting the cesium precursor solution into the mixed clear solution, maintaining the temperature at 22°C for 10 seconds, adding isopropanol and acetylene dicarboxylic acid, heating to 100°C after 10 seconds and maintaining the temperature for 10 minutes, cooling the reaction temperature to room temperature, centrifuging and washing, and collecting the precipitate to obtain the CsPbBr3 nanosheet material. This application involves the use of the CsPbBr3 nanosheet material in the preparation of photodetectors. This application can improve the luminous efficiency and stability of CsPbBr3 nanosheets under blue light, and improve the performance of photodetectors based on CsPbBr3 nanosheets.

The invention discloses a lead thiophosphate composite nitrogen-doped carbon porous microsphere material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The preparation method of the lead thiophosphate composite nitrogen-doped carbon porous microsphere material comprises the following steps: dissolving a lead salt in an organic solvent, dissolving 2-methylimidazole in water, mixing the two solutions, carrying out solvothermal reaction, separating out a product, and reacting with a gas-phase sulfur source and a phosphorus source under the protection of inert gas to obtain the lead thiophosphate composite nitrogen-doped carbon porous microsphere material. The lead thiophosphate composite nitrogen-doped carbon porous microsphere composite material is obtained. According to the invention, a metal organic framework template method and a chemical vapor deposition method are ingeniously combined, and a brand new path for controllably preparing the lead thiophosphate composite nitrogen-doped carbon porous microsphere material is provided. When the prepared lead thiophosphate composite nitrogen-doped carbon porous microsphere material is used as a sodium ion battery negative electrode, a porous microsphere negative electrode formed by compounding lead thiophosphate and nitrogen-doped carbon shows remarkably improved electrochemical performance.

To provide a photoresponsive nanocrystal having a narrow FWHM blue emission wavelength or a narrow FWHM red emission wavelength in the color gamut defined by BT.2020. [Solution] A photoresponsive nanocrystal having a composite layer structure in which a first layer containing cation A and a second layer containing cation B and anion X are alternately stacked, and comprising a nanocrystalline plate having ligands that exist by substituting at least a portion of cation A, wherein the aspect ratio, which is a rectangular shape feature in a direction intersecting the stacking direction of the composite layer structure, is 0.2 or more and 5 or less, and the superlattice structure has superlattice peaks in the diffraction angle range of ±5 degrees that straddles the main diffraction peak of the X-ray diffraction profile by the 2θ method.

The application discloses a kind of perovskite nanowires and preparation method and application thereof.The preparation method of perovskite nanowire of the application includes the following steps: 1) CsBr, PbBr2 and trimesic acid are dissolved in polar aprotic solvent to obtain precursor solution;2) precursor solution and oleylamine are dispersed in non-polar solvent to react, then product separation, purification and drying are carried out to obtain perovskite nanowire.The perovskite nanowire of the application has [100] preferred orientation single crystal nanowire structure, and has less surface defects, high carrier transport efficiency, strong resistance to water and oxygen and light, simple preparation process, low production cost, the long-term stability of ultraviolet photodetector made of it is excellent, suitable for large-scale industrial production and application.

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 relates to the field of semiconductor materials with photoelectric functions, in particular to a synthesis method of a perovskite precursor material. According to the synthesis method of the perovskite precursor material, the waste liquid treatment step is added, the waste liquid treatment step is based on the synthesis step of the precursor material, lead-free emission and high lead element recovery rate are achieved, the preparation process is completely carried out in a conventional air environment, and extra environment control cost is avoided; no organic solvent is needed in the preparation process, and the solvent for washing can be completely recycled theoretically, so that the cost and environmental pollution are reduced; the lead element is recycled after preparation, so that the pollution is reduced while the cost is saved, and nearly complete utilization of the lead element can be realized in the circulation process; the prepared perovskite precursor is good in performance; the steps are simple and easy to industrialize.

This invention discloses a method for preparing cerium-doped CsPbBr3 perovskite clusters (PMSCs) and their application in antibacterial hydrogels, belonging to the field of perovskite cluster technology. The method includes: dissolving PbBr2, CsBr, and CeBr3 in a polar aprotic solvent to obtain a metal halide precursor solution; adding carboxylic acid ligands and amine ligands to the precursor solution, mixing and filtering to obtain a precursor filtrate; preparing cerium-doped CsPbBr3 PMSCs through a reprecipitation reaction, and further performing hydrophilic modification or combining with a hydrogel matrix to obtain an antibacterial hydrogel material. 3+ Doping and ligand-assisted passivation can reduce deep-level trap density, suppress nonradiative recombination, and improve the interfacial reactivity of materials. Simultaneously, ligand shell protection and interfacial encapsulation help enhance the structural and optical stability of materials under high humidity and aqueous conditions, reducing the risk of cluster aggregation and structural reconstruction. This method has the advantages of mild conditions, simple process, and promising application prospects.

The application discloses a method for in-situ growth of perovskite quantum dots on carbon nitride nanosheets, and products and applications thereof. Perovskite quantum dot precursors are mixed and ground with graphite-phase carbon nitride nanosheets to realize mechanical chemical pre-reaction. Then, low-temperature freezing treatment is performed, and the mixture after the freezing treatment is calcined in an inert atmosphere to realize in-situ synthesis of perovskite quantum dots on the carbon nitride nanosheets. The calcined sample is sequentially subjected to water washing, alcohol washing, and then drying to obtain a perovskite quantum dot / graphite-phase carbon nitride nanosheet composite material. The synthesis of the quantum dots is directly synthesized under high-temperature solid-phase conditions without adding ligands, the quantum dots have few interface defects with the carbon nitride, which is beneficial to carrier transmission and eliminates the influence of ligands on photo-generated carriers.

The invention is applicable to the technical field of materials, and provides a customized lead selenide quantum dot preparation method, which comprises: preparing a lead oleate precursor and a trioctylphosphine-selenium precursor in advance; the temperature of the lead oleate precursor in the first reaction container is stabilized to 170-250 DEG C, after the trioctylphosphine-selenium precursor is injected, the temperature is reduced to 135-215 DEG C, and meanwhile, a second reaction container containing octadecene is heated to the same temperature; transferring the thermocouple and the heating jacket of the container II to the container I, keeping the temperature at 135-215 DEG C, reacting for 15 minutes, adding methylbenzene, and quenching in an ice-water bath; and after subpackaging the product, carrying out centrifugal purification twice by using methanol / ethanol, trichloromethane and acetone to obtain the lead selenide quantum dot with the adjustable luminescence peak position of 1200-2500nm. Continuous adjustment of the spectrum and the half-peak width can be achieved, PLQY can be improved by adding phenylethyl ammonium chloride, uniform particle size is guaranteed through the double-container design, operation is easy, convenient and repeatable, the material can be excited by multiple wavelengths, and the method is suitable for the field of optical devices.

A perovskite precursor solution according to one embodiment of the present disclosure comprises a halide precursor, Sn ions, Ni as a reducing agent, and a solvent, and the Sn ions can include Sn2+ and Sn4+.

This invention proposes a simple and easy-to-operate method for preparing core-shell quantum dots that suppress Auger recombination, and develops Mn-doped CsPbCl3@Cs4PbCl6 core-shell nanocrystals. The Auger suppression performance was studied using wavefunction engineering. The method includes the following steps: ① Synthesizing CsPbCl3 nanocrystals via thermal injection. ② Forming a Cs4PbCl6 shell nanocrystal on the CsPbCl3 nanocrystals. An oleic acid solution containing Cs is added to the CsPbCl3 nanocrystals; Cs ions tend to react with free Pb ions, and the Cs4PbCl6 shell nanocrystals grow epitaxially on the surface of the CsPbCl3 core nanocrystals. ③ Injecting a MnCl2 precursor into the pre-synthesized core-shell nanostructure at room temperature yields highly efficient Mn-emitting nanocrystals with promising applications in optoelectronics, generating significant social and economic benefits.

The invention belongs to the technical field of perovskite quantum dot material preparation, and relates to a perovskite aerogel yarn and a preparation method and application thereof. The preparation method comprises the following steps: mixing a silicon source, a weakly alkaline catalyst, a mesoporous template and deionized water for reaction, and washing and drying after the reaction to obtain a nano mesoporous SiO2 material; mixing and stirring the nano mesoporous SiO2 material with a fluorine source, a cesium source, a bromine source, a lead source and deionized water to obtain a precursor dispersion liquid; the precursor dispersion liquid is dried, calcined, washed, dried and ground, and fluorine-modified perovskite (at) SiO2 luminescent particles are obtained; and spraying fluorine modified perovskite coated SiO2 luminous particle spray on the nanofiber membrane, twisting, soaking, drying and forming to obtain the perovskite aerogel yarn material. The material can still keep high brightness and stable luminescence performance in extreme environments such as high temperature of 200 DEG C or moisture and water immersion, and the application range of the luminous fabric is obviously expanded.

The application relates to a preparation method and application of a perovskite crystal in an aqueous solution, wherein the preparation method comprises the following steps: firstly, mixing and stirring a lead source and an iodine source in an aqueous phase to perform ion reaction, obtaining solution A, adding formamidinium salt in the solution A to perform ion reaction, and washing and drying to obtain the perovskite crystal, wherein the iodine source comprises NH4I; or, adding formamidinium salt in the solution A to perform ion reaction, then adding a cesium source to perform ion reaction, washing and drying the reaction solution to obtain the perovskite crystal. The perovskite crystal comprises FAPbI3 or CsPbI 3。 The application uses NH4I to replace HI in a traditional synthesis as a unique iodine source for synthesizing perovskite, and avoids problems such as unsafe operation process, storage and transportation difficulties caused by the corrosiveness of HI.

A method includes a step of preparing a nanoparticle that has a perovskite-type crystal structure as an allotrope and includes multiple crystal structures, a step of preparing a ligand solution containing a solvent that has a relative dielectric constant of a prescribed value or less and an associative ligand that includes a main chain having a plurality of carbon atoms and a polar group having a higher polarity than the main chain and self-associates in the solvent, and a step of preparing a nanoparticle dispersion by bringing the nanoparticle and the ligand solution into contact with each other, wherein the step of preparing a nanoparticle dispersion includes a step of selectively increasing the ratio of the content of a prescribed crystal structure in the multiple crystal structures.

The present disclosure relates to a particle having a core-shell structure, wherein the core comprises a perovskite compound CsPbX3, and the shell comprises Csn-1PbnX3n+12− and at least one organic ammonium cation R1R2R3R4N+, wherein n is 1 or 2; R1 is selected from the group consisting of optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted arylalkyl, and optionally substituted heteroaryl; R2, R3, and R4 are each independently selected from the group consisting of —H, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted arylalkyl, and optionally substituted heteroaryl; and X is a halide. The present disclosure also relates to a method of passivating a perovskite compound CsPbX3, the method comprising the step of: adding an organic ammonium halide R1R2R3R4NY to the CsPbX3 at a molar ratio of R1R2R3R4NY:CsPbX3 of about 500:1 to about 60000:1 to form a mixture, wherein R1 is selected from the group consisting of optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted arylalkyl, and optionally substituted heteroaryl; R2, R3, and R4 are each independently selected from the group consisting of —H, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted aryl, optionally substituted arylalkyl, and optionally substituted heteroaryl; and X and Y are independently a halide.

Organic-inorganic halide perovskite (OIHP) materials through their promising material properties, simple solution processability, low material cost, high photon absorption, carrier mobilities, and tunable band gap are suitable for large area coatings in the fabrication of optical displays, LEDs, photovoltaic cells and photodetectors. However, OIHP stability and shelf life have been limited to date as exposed perovskite films do not survive long in ambient air causing further issues for large scale OIHP based device production and deployment. Accordingly, the inventors have established three-cation material system variants using an innovative single solution thiocyanate (SCN) doped three cation material system allowing tailoring of perovskite grain size and microstructure to minimize degradation from exposure to atmospheric conditions. Further, solvent engineering techniques using the innovative single solution SCN doped three cation material system established by the inventors allow for large area processing, compact OIHP films with large crystal grains (>4 μm), and passivated grain boundaries.

To provide a perovskite-type compound having high heat resistance.SOLUTION: A perovskite-type compound has a composition formula represented by A(Pb1-xSnx)I3-yBry. An element A is one or more elements selected from a group consisting of Li, Na, K, Rb and Cs. x and y in the formula belong to any of the following ranges (1) to (6): (1) 0.0≤x<0.0125 and 1.6≤y≤3.0, (2) 0.0125≤x<0.1 and 1.1≤y≤3.0, (3) 0.1≤x<0.3 and 0.8≤y≤3.0, (4) 0.3≤x<0.5 and 0.8≤y≤3.0, (5) 0.5≤x<0.7 and 0.8≤y≤2.8, and (6) 0.7≤x≤0.8 and 0.8≤y≤1.8.SELECTED DRAWING: None

A method for producing a photoresponsive nanoparticle. The method includes a first step of continuously transporting a first raw material liquid containing a lead halide and a second raw material liquid containing a fatty acid cesium to a heated mixer through a transport path, and a second step of mixing the first raw material liquid and the second raw material liquid.