11 results about "Lead bromide" patented technology

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 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 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).

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.

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 application belongs to the technical field of perovskite material preparation, and particularly discloses a mixed halogen perovskite single crystal material and a preparation method thereof. 2.8 I 0.2 The obtained single crystal is treated at 20 DEG C and 90% RH for 3-6 h, surface defects are systematically repaired by using the moisture-induced lattice expansion and surface hydroxyl passivation mechanism, ion migration is inhibited, and the phase separation phenomenon is slowed down. The process is simple, controllable, and reproducible, and is suitable for laboratory-scale preparation and industrialization promotion.

The application relates to the field of coordination chemistry and provides a lead-based perovskite material, a preparation method and application, the chemical formula of the lead-based perovskite material is (C 10 H 11 N3)PbBr4, the lead-based perovskite material belongs to a monoclinic system, and the preparation method comprises the following steps: placing bis (4-pyridine) amine and lead bromide in a round-bottom flask, then adding hydrobromic acid, and then reacting under an oil bath at 373-393 K for 3 h; after standing, filtering, and cooling to room temperature, the lead-based perovskite material is obtained. The lead-based perovskite material with a second-order nonlinear optical effect, the preparation method and application, the lead-based perovskite material preparation operation is simple, energy consumption is low, easy to realize, reaction time is short, and the requirements for reaction and purity are low; and the lead-based perovskite material has a second-order nonlinear optical effect.

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.

Methods of growing large, free-standing single crystals of (FAxCs1-x)PbBr3 perovskites, where 0≤x<1, in solution using tertiary or ternary alkyl ammonium salts, weak organic acids, or a combination thereof are provided. By including the additives in a crystallization solution with perovskite precursors, larger single crystals can be grown by slow evaporation or inverse temperature crystallization than would possible in the absence of the additives under the same growth conditions.

The application belongs to the field of perovskite materials, and discloses high-purity lead bromide and a production method thereof. The production method of the high-purity lead bromide comprises the following steps: heating and stirring a lead acetate solution, adding a hydrobromic acid solution dropwise into the lead acetate solution, keeping the reaction under the condition of heating and stirring, and then sequentially cooling, aging, solid-liquid separation, washing and drying the obtained solid particles, so that the high-purity lead bromide is obtained. The production method provided by the application controls the reaction system in an acidic environment, which can accelerate the precipitation reaction rate of lead ions and bromine ions, promote the rapid generation of lead bromide crystals, adjust the system dissolution balance in the acidic environment, reduce the solubility product Ksp of lead bromide, reduce the loss of lead ions, ensure that the lead ions are fully converted into lead bromide precipitates, and further improve the yield and purity of the product.