12 results about "Lead chloride" patented technology

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 invention discloses a room-temperature phase pyroelectric material and its preparation method, relating to the field of pyroelectric material technology, with the chemical formula C4H. 14 N₂OPbCl₄ is prepared as follows: 2-Dimethylaminoethylamine is cooled and stirred in an ice-water bath, then hydrogen peroxide solution is added dropwise while stirring. After the reaction, the resulting reaction solution is vacuum dried to obtain the nitrogen oxide of 2-dimethylaminoethylamine. The nitrogen oxide of 2-dimethylaminoethylamine and lead chloride are added to a concentrated hydrochloric acid solution, heated in an oil bath, and stirred to obtain a pyroelectric material. The pyroelectric material of this invention has a perovskite structure and undergoes a reversible phase transition reaction at a phase transition temperature of 27°C. During the phase transition, a current is generated at the polar axis of the crystal. The phase transition temperature at room temperature allows the pyroelectric material to operate within a relatively stable temperature range, providing reliable energy collection performance and showing great application value in waste heat utilization, self-sustaining systems, and other fields.

The application discloses a method for preparing a heterojunction perovskite photodetector, comprising the following steps: preparing an electron transport layer; dissolving lead iodide and lead chloride in a mixed solution of dimethylformamide, N-methylformamide and N-methylpyrrolidone to obtain a precursor solution; in an air atmosphere, spin-coating the precursor solution onto the electron transport layer, immediately immersing into an anti-solvent after uniform spreading, and obtaining a PbI2-PbCl2 film after crystallization; spin-coating a methylammonium iodide solution onto the PbI2-PbCl2 film, and obtaining a perovskite film after vacuum annealing; spin-coating a long-chain ligand solution onto the three-dimensional perovskite film, vacuum annealing, and obtaining a perovskite heterojunction film; sequentially preparing a hole transport layer, a hole blocking layer and an anode on the perovskite heterojunction film to obtain the heterojunction perovskite photodetector. The method has the advantages that the prepared photodetector has high external quantum efficiency and high detection rate, and the preparation is simple.

The present application belongs to the technical field of waste lead acid battery resource and lead chloride crystal preparation, and discloses a method for preparing lead chloride crystal from waste lead paste by a short wet process, which specifically comprises the following steps: S1: stirring and reacting the waste lead paste in a carbonate solution to obtain desulfurized lead paste; S2: using an HCl-NaCl mixed solution as a leaching agent to leach the desulfurized lead paste to obtain a leaching solution; and S3: recrystallizing to obtain lead chloride crystals. The present application improves the overall process design of the preparation method, first uses a carbonate solution to desulfurize the waste lead paste, then uses an HCl-NaCl mixed solution as a leaching agent to leach the desulfurized lead paste, and finally recrystallizes to obtain high-purity lead chloride crystals, effectively solving the technical problems of long process steps, large reagent input, and low conversion rate of lead chloride in the prior art.

The application relates to a lead sulfide quantum dot preparation method, which specifically comprises the following steps: rapidly injecting an amine solution of activated zinc dithiocarbamate into a mixed solution of lead chloride and oleylamine to make it nucleate and grow, and adjusting the size of the synthesized PbS quantum dots by adjusting temperature and growth time, etc. A single precursor zinc dithiocarbamate completely replaces ZnS quantum dots as a nucleation and growth sulfur source, does not need to be added dropwise, saves time, omits the complex steps of synthesizing ZnS quantum dots, and can be stably kept at a certain size for a long time without ripening.

The invention relates to the technical field of bismuth refining, and discloses a method for removing lead in bismuth refining, which comprises the following steps: introducing chlorine gas into a bismuth solution in a molten state to enable impurity lead in the bismuth solution to generate lead chloride, and separating the lead chloride from the bismuth solution; in the process of introducing chlorine, air or inert gas is intermittently introduced to stir the bismuth liquid, the interval time is 4-8 h, the continuous introduction time of the air or inert gas is 0.5 h, and the introduction pressure is 2-3 Mpa. The invention further discloses a lead removal device for bismuth refining, and the lead removal device is used for implementing the method. According to the method, lead in the bismuth liquid can be removed, the reaction time can be shortened, the reaction rate can be increased, and the content of lead in the bismuth liquid can be reduced to 10 ppm.

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.

This invention discloses a method for preparing a blue light-emitting thin film, the blue light-emitting thin film, and a light-emitting device. The method involves dissolving a mixture of cesium bromide, lead bromide, lead chloride, and an organic ligand in dimethyl sulfoxide solvent to obtain a precursor solution. An additional ligand is added to the precursor solution to obtain a perovskite precursor solution. An additive is added to the perovskite precursor solution, and the mixture is stirred for a predetermined first time to obtain a homogeneous solution. The homogeneous solution is then spin-coated in a nitrogen-filled glove box, with an antisolvent added during the spin-coating process to obtain a raw thin film. The raw thin film is annealed and then vacuum-dried to obtain a blue light-emitting perovskite thin film. The above method uses amine salts as organic ligands and small-molecule amine salts as additional ligands, ultimately resulting in a significant improvement in the photoluminescence quantum efficiency, maximum external quantum efficiency, and maximum power efficiency of the prepared blue light-emitting perovskite thin film, as well as achieving high maximum brightness and a stable electroluminescence spectrum.

The invention provides a modified perovskite light absorption layer and a preparation method and application thereof, and the preparation method comprises the following steps: (1) carrying out the one-step evaporation treatment on the surface of a substrate through lead iodide, cesium bromide and lead chloride, and obtaining a first evaporation layer; (2) carrying out two-step evaporation treatment on the surface of the first evaporation layer by using lead iodide, cesium bromide and lead chloride to obtain a second evaporation layer; and (3) carrying out three-step evaporation treatment on the surface of the second evaporation layer by using organic cation amine salt to obtain an organic cation amine salt layer, and carrying out annealing treatment on the obtained material to obtain the modified perovskite light absorption layer, wherein the evaporation rate of the one-step evaporation treatment of lead chloride is gt; the evaporation rate of the two-step evaporation treatment of lead chloride is increased. According to the method for preparing the modified perovskite light absorption layer, the compactness of the thin film can be adjusted, the high perovskite phase conversion degree is promoted, and the quality of the perovskite light absorption layer is improved.

The method comprises the following steps: dissolving lead chloride, manganese chloride, hydrochloric acid and polyether amine D400 in N, N-dimethylformamide to form a polar precursor solution, mixing the polar precursor solution with an oleic acid / n-octane weak polar solvent containing cesium acetate, stirring for 1 hour at 20-30 DEG C and 400 r / min, centrifuging for 3-5 minutes at 8000-10000 r / min, and drying to obtain the manganese-doped flexible lead halide perovskite material. And washing with n-hexane for three times. The material is composed of an amorphous perovskite network and embedded nanocrystals with the average diameter of 6.8 nanometers, and has polymer-like viscoelasticity and 3D printing capacity; the photoluminescence quantum yield exceeds 50%, and the Stokes shift is gt; the X-ray excitation light yield is about 8.07 * 10 < 4 > photons / megaelectron volts, and the imaging resolution is 9.0 line pairs / mm. The material is still excellent in performance after being subjected to 300% stretching, 5000 times of bending circulation, air storage for nearly two months and 5 minutes of self-healing, and is suitable for flexible electronic devices, wearable X-ray detection equipment and complex three-dimensional common imaging systems.

The invention relates to a method for treating lead sulfate slag through a base hydrogen direct reduction process. The method comprises the following process steps that (1) the lead slag enters a pretreatment drying system through a feeding system to be dried and then is put into a hydrogen reduction smelting reaction furnace; (2) valuable components such as lead sulfate and lead chloride in the lead sulfate are directly reduced into crude lead in one step; (3) adding coke and caustic soda flakes into the crude lead, and further treating to obtain products A and B; (4) after the product A passes through an ingot casting system, preparing a lead ingot containing more than 99% of lead for sale; (5) the obtained product B is high-zinc alkaline residues, and part of the high-zinc alkaline residues enter a rotary kiln or a wastewater treatment system to replace caustic soda flakes to adjust the PH value; and the other part of high-zinc alkaline residues enter a second-section vacuum distillation furnace and are continuously treated, and zinc ingots containing more than 99% of zinc are generated from the obtained product through an ingot casting system and are sold. Compared with other methods or equipment, the method is more environmentally friendly and more energy-saving, cyclic utilization is facilitated, and the utilization efficiency is improved.

The invention belongs to the field of perovskite materials, and discloses high-purity lead chloride and a production method thereof. The production method comprises the following steps: heating a lead acetate solution, dropwise adding a diluted hydrochloric acid solution into the lead acetate solution, then adding a concentrated hydrochloric acid solution to adjust the pH value to 0.5-1.0, carrying out a heat preservation reaction, then cooling to room temperature, and then sequentially carrying out solid-liquid separation, washing and drying to obtain solid particles, namely the high-purity lead chloride. By accurately regulating and controlling the core reaction condition, the problems of uneven granularity, irregular morphology and insufficient purity of the product in the prior art are effectively solved, and a multiple optimization effect is realized.