146results about "Lead halides" patented technology

The invention belongs to the technical field of preparation of semiconductor nanomaterials and discloses a single-size CsPbX3 perovskite nanocrystalline preparation method. The method includes: adding cesium carboxylate solution into N2 protected lead bromide solution to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline; scattering the single-size CsPbX3 perovskite nanocrystalline into normal hexane, and gradually adding lead chloride solution or lead iodide solution drop by drop to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline. The single-size CsPbX3 perovskite nanocrystalline preparation method has the advantages of simplicity in operation, easiness in size adjustment of products, component controllability and the like.

The invention relates to an overall treatment method of steel works sintering dust, which is characterized by comprising the following steps: carrying out stage treatment on electrically precipitated dust in a sintering head, conveying the electrically precipitated dust produced in a primary electric field directly to a sintering field (a stock yard or a material distribution room) for material application in case of sintering; mixing the electrically precipitated dust produced in a subsequent electric field and then carrying out stirring pulping, gradient magnetic separation, carbon selection by flotation and solid-liquid separation; when the solid-liquid separation is finished, using the obtained potassium solution for producing potassic fertilizer and extracting lead product from the obtained tailing slurry.The method of the invention has the advantages that different process routes are adopted to effectively recover and comprehensively utilize contained multiple valuable resources such as ferrum, carbon, potassium, lead and the like according to different contents of alkali metal such as potassium and sodium and heavy metal compounds such as lead, zinc and copper in different electric field precipitated dust in a sintering head electric precipitator.

The invention relates to a completely-organic perovskite nano-sheet, and a preparation method and an application thereof. The preparation method comprises the following steps: adding a cesium precursor solution at room temperature, adding an organic solvent as a solvent and a surfactant, gradually rising the temperature to a preset temperature according to a certain heating rate in an inert gas atmosphere, rapidly carrying out ice water bath cooling, and repeating the centrifugation, re-dispersion and washing process to obtain the completely-inorganic CsPbBr3 perovskite nano-sheet which can be applied to blue LED devices. The reaction power is controlled by regulating the reaction temperature and the reaction time in order to obtain the completely-inorganic CsPbBr3 perovskite nano-sheet with the thickness being same to the thickness of 1 to 5 atom layers. The luminescence wavelength of the nano-sheet is in a range of 440-470 nm, and the nano-sheet can be applied to the blue LED devices, and has a good application prospect.

The invention relates to a fluorescent perovskite nanocrystal, and a preparation method and application thereof. The structure of the fluorescent perovskite nanocrystal is MOF-ABX3, wherein the mass ratio of MOF to ABX3 is (1-50):(0.1-5). A cationic halide salt solution used for perovskite synthesis is added into a metal organic framework dispersion liquid, and obtained perovskite nanocrystals areuniformly dispersed in metal organic framework crystals. Good fluorescence performance is achieved, and the method has universality. The synthesis method of the perovskite nanocrystal provided by theinvention can be directly used in applications of storage and protection of confidential information. Compared with the prior art, the operation process is simple and repeatable, the metal organic framework material and recorded information are very safe (absorption and fluorescence characteristics are avoided in a visible light range, and recognition by naked eyes is avoided), and the perovskitenanocrystal has a good fluorescence characteristic, so that the perovskite nanocrystal can be directly applied to the field of storage and protection of confidential information.

The invention discloses a method for scale rapid preparation of a perovskite semiconductor material, wherein the method comprises the specific steps: dissolving or partially dissolving PbX2 and AX in a precursor solvent according to a certain proportion to obtain a precursor solution system; then adding a cosolvent, to obtain a clarified liquid; followed by, adding an anti solvent, and carrying out fast stirring reaction to generate an intermediate transition phase precipitate; and then carrying out drying treatment of the intermediate transition phase precipitate for 1 min-10 h at room temperature-100 DEG C, to obtain high-purity A4PbX6, wherein A is Cs<+>, Ru<+>, a methylamine cation, a formamidine cation or a mixed cation thereof, and X is a halogen ion. All the anti solvent, the precursor solvent and the co-solvent and the like used in the preparation process can be recovered and continue to use in next circulating production; circulation and no emissions are achieved in the whole preparation process, high yield and scale preparation of the product are achieved, the product has high fluorescence quantum yield, and the cost is low.

The invention relates to a preparation method of a small-size high-stability perovskite nanocrystalline Cs4PbBr6, and belongs to the technical field of preparation of semiconductor nanomaterials. Thepreparation method comprises the following steps: firstly injecting a caesium carboxylate solution into a lead bromide solution at the temperature of 140 DEG C to 200 DEG C under the protection of N2,reacting, synthesizing a perovskite nano-block CsPbBr3 with the size of 3.8 nm to 11.8 nm, purifying the perovskite nano-block CsPbBr3, dispersing the perovskite nano-block CsPbBr3 by using octadecene, raising the temperature to 25 DEG C to 120 DEG C, injecting an ammonium bromide solution, reacting for 3-8 minutes, then centrifuging and purifying to obtain a nanoparticle Cs4PbBr6. The preparation method has the characteristics of easy operation, simple steps and rapid reaction, the raw materials are easy to get, the prepared particles Cs4PbBr6 are uniform in size, regular in morphology and excellent in stability, and the particle keeps unchanged even after a stock solution is placed in the air for a month.

The invention belongs to the technical field of solid waste recycling and reusing and particularly relates to a bullion lead comprehensive treatment method. Through the bullion lead comprehensive treatment method provided by the invention, open-circuit of arsenic, lead, bismuth and antimony and high-efficiency enrichment of precious metals gold and silver are realized through twice vacuum distillation, and elementary arsenic, a lead-bismuth-antimony alloy, a silver alloy and a copper alloy can be obtained respectively; the lead-bismuth-antimony alloy, the silver alloy and the copper alloy aretreated through oxidizing refining, electrolytic refining and chlorination refining to obtain refined lead, refined bismuth, antimony trioxide and electrolytic silver and electrolytic silver, and goldenrichment is realized; the bullion lead comprehensive treatment method has the advantages of being high in metal direct yield, low in energy consumption, short in flow, simple in equipment and the like in the whole treatment process; and moreover, vacuum distillation belongs to the physical process; the alloys can be separated through the saturated vapor pressure difference of the metals withoutgeneration of waste water, waste gas and waste residues, and industrialization, automation and continuity of bullion lead treatment can be achieved easily.

The invention discloses a method for preparing a CsPbBrxI3-x nanorod. The method comprises the steps that a Cs2CO3-octadecene mixture is prepared, then excessive oleic acid is added into the mixture, the mixture is heated at the temperature of 120 DEG C under the nitrogen condition till Cs2CO3 and oleic acid completely react, and an oleic acid cesium solution is obtained; PbI2 and PbBr2 are taken and added into octadecene, the mixture is heated to 120 DEG C under the nitrogen condition, then a small amount of oleylamine and oleic acid is added, the temperature is raised to 135 DEG C, the mixture is heated till PbI2 and PbBr2 are dissolved, then the oleic acid cesium solution is added for reacting for 10 min to 80 min, the reaction product is subjected to an ice bath, centrifugation and methylbenzene purification, and the CsPbBrxI3-x nanorod is obtained. The molar ratio of cesium to lead is 1:1.8, and the molar ratio of iodine to bromine is 2:1. Compared with the prior art, the reaction steps are simplified, the reaction time is shortened, the temperature needed for the reaction is reduced, and the band gap and fluorescence emission of the CsPbBrxI3-x nanorod can be adjusted through the duration of the reaction time.

The invention relates to the technical field of monodisperse powdery material preparation and provides a monodisperse high-purity lead iodide preparation method. The preparation method comprises the steps of preparing a lead salt solution and a soluble iodate solution and adjusting a pH as 0.5 to 7; performing precipitation reaction on the lead salt solution and the soluble iodate solution in a contact mode to obtain precipitate turbid liquid of lead iodide; ageing for 1 to 48 hours at room temperature and filtering, washing and drying to obtain a high-purity lead iodide powder product. The preparation method disclosed by the invention has the beneficial effects of simpleness in operation, high purity, stable and reliable quality and easiness in expanding preparation in large scale.

The present invention relates to methods for preparing sensitized solar cells using organic-inorganic perovskites as sensitizers.

The invention discloses a method for preparing lead chloride and calcium sulfate from lead plasters of waste lead accumulators by a wet process. The lead plasters of the waste lead accumulators are taken as a raw material, and the method comprises the following steps of: leaching the lead plasters in an HCl-NaCl system; cooling the leach solution to separate out crystals; and separating, washing and drying. The method is characterized in that: a sulfur resource is recovered from cooling crystallization filtrate, and the cooling crystallization filtrate is in a closed cycle; the cooling crystallization filtrate is added with calcium chloride to form a calcium sulfate precipitate; the calcium sulfate precipitate is separated, washed and dried to form a calcium sulfate product; and the filtrate is used for preparing saturated NaCl solution which returns to the leaching process. Through the method, the lead chloride is obtained, and the industrial gypsum with the purity of over 97 percent is also obtained, so the sulfur resource is recycled, the cooling crystallization filtrate is circularly used, the lead recovery rate is over 96 percent after four times of circulation, and the waste of the lead resource and the lead pollution are avoided.

The invention discloses Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder and a preparation method of the Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder. According tothe method, the zero-dimensional perovskite nanocrystalline scintillation powder required for radiation field detection can be realized. The method is a method for successfully synthesize the Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder in batch in an organic solvent by utilize a solvothermal method and adjusting parameters such as reactant ratio, reaction temperature, time andthe like. Yellow-green samples synthesized at a certain temperature with organic solvent dimethyl sulfoxide as solvent and solutes CsBr and PbBr2 as solutes are washed, filtered and dried to obtain abright green finished product, namely, the Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder. The preparation method provided by the invention is simple, low in cost, strong in controllability and capable of mass production; and the Cs4PbBr6/CsPbBr3 perovskite prepared by the method has excellent quantum luminous efficiency, good stability and good thermal recovery characteristics.

The invention discloses a method for synthesizing CsPbBr3 nanocrystal through centrifugal stirring. The method comprises the following steps: dissolving cesium bromide and lead bromide into dimethyl sulfoxide, then transferring to a centrifuge for centrifugation, standing after completion of the centrifugation, removing a supernatant, washing the dimethyl sulfoxide, filtering, and performing vacuum drying to obtain CsPbBr3 nanocrystal powder. The CsPbBr3 nanocrystal synthesized by the method provided by the invention has high fluorescence efficiency, can be unquenched for a long time at high temperature, has a wide application prospect; meanwhile, by the method provided by the invention, a technology is simple, any surface modifier and any toxic solvent are added, environment friendlinessis achieved, raw materials are cheap, operation is convenient, the efficiency is high, and industrial production is facilitated.

The invention relates to a preparation method of a lead iodide material with a controllable shape. The preparation method comprises the following steps: dissolving lead acetate trihydrate in an acidicaqueous solution to obtain a lead acetate aqueous solution, then dropwise adding a potassium iodide solution into the lead acetate aqueous solution, then transferring the mixed solution into a polytetrafluoroethylene reaction kettle to be sealed, reacting for 8 to 16 hours at 80 to 120 DEG C to obtain a lead iodide material. The process is simple, the reaction condition is mild, the operation isconvenient, by adjusting the content of acid, the particle size of a prepared PbI2 material can be adjusted in a range of 1 to 60 micrometers, the distribution range of the particle size can be effectively controlled, and the particle shape, i.e. a ratio of a surface {001} to a surface {101} can be effectively controlled. A micelle particle size of a PbI2 colloidal solution prepared from the PbI2material of different shapes and sizes is in a range of 100 to 1000 nm, and the distribution range of the micelle particle size is adjustable. The shape of a PbI2 film prepared by using a solution spin-coating method can be effectively controlled.

The invention relates to a lead fluoride crystal co-doped with ytterbium and alkaline and a preparation method thereof. The structural formula of the crystal is Ybx: My: PbF2, and the growth method of the crystal includes the following steps: (1) the values of x and y are determined; (2) the raw material is weighed in proportion, is fully and evenly mixed and is pressed into blocks, the blocks are put into an iraurite, platinum or plumbago crucible, PbF2 crystal is adopted as a seed crystal, growth atmosphere is high purity argon or CF4 gas, and melt growth method is adopted. Experiments show that the crystal of the invention has large absorption and emission section, long fluorescence life time and high thermal conduction.