6 results about "Lead chloride" patented technology

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.

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.