A method includes at least partially submerging a substrate in a colloidal mixture of nanocrystals and a first solvent. The nanocrystals have first ligands coupled thereto. The method also includes applying an electric field to the colloidal mixture to form a solvated nanocrystal film and removing the solvated nanocrystal film from the first solvent. The method further includes applying a second solvent to the solvated nanocrystal film for ligand exchange. The second solvent comprises second ligands. A nanocrystal film product formed by one-step ligand exchange includes at least one dimension greater than 100 nm and ordered nanocrystals characterized as having a domain size of greater than 100 nm.

The present disclosure relates to a perovskite sheet that includes two outer layers, each including AX; and a first layer that includes BX.sub.2, where B is a first cation, A is a second cation, X is a first anion, X is a second anion, and the first BX.sub.2 layer is positioned between the two outer layers.

A fluorescent material includes at least one fluorescent compound having a structure formula of ABX.sub.ZY.sub.3-Z as defined in the specification, a plurality of NH.sub.3.sup.+ group-containing ions bound to the fluorescent compound through protonation of amine groups of an amine composition, and a plurality of COO.sup. group-containing ions bound to the fluorescent compound through deprotonation of carboxyl groups of an acid composition. The amine composition has a total hydrogen bonding Hansen solubility parameter (T.sub.H) ranges from 2.4 to 3.3 (cal/cm.sup.3).sup.1/2, and the acid composition has a total polar Hansen solubility parameter (T.sub.P) which is less than 1.4 (cal/cm.sup.3).sup.1/2.

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.

Described herein are compositions and methods relating to luminescent structures.

The present invention provides a method for producing a solution of nanosheets, comprising the step of contacting an intercalated layered material with a polar aprotic solvent to produce a solution of nanosheets, wherein the intercalated layered material is prepared from a layered material selected from the group consisting of a transition metal dichalcogenide, a transition metal monochalcogenide, a transition metal trichalcogenide, a transition metal oxide, a metal halide, an oxychalcogenide, an oxypnictide, an oxyhalide of a transition metal, a trioxide, a perovskite, a niobate, a ruthenate, a layered III-VI semiconductor, black phosphorous and a V-VI layered compound. The invention also provides a solution of nanosheets and a plated material formed from nanosheets.

The present invention provides a method for producing a solution of nanosheets, comprising the step of contacting an intercalated layered material with a polar aprotic solvent to produce a solution of nanosheets, wherein the intercalated layered material is prepared from a layered material selected from the group consisting of a transition metal dichalcogenide, a transition metal monochalcogenide, a transition metal trichalcogenide, a transition metal oxide, a metal halide, an oxychalcogenide, an oxypnictide, an oxyhalide of a transition metal, a trioxide, a perovskite, a niobate, a ruthenate, a layered III-VI semiconductor, black phosphorous and a V-VI layered compound. The invention also provides a solution of nanosheets and a plated material formed from nanosheets.

Core-shell particles may be based on red lead coated with pyrogenically produced titanium dioxide and/or a pyrogenically produced aluminum oxide, and a process may prepare such core-shell particles which may be used in lead-acid batteries. The red lead may include PbO.sub.2 in a range of from 25 to 32 wt. %.

A solvent-free and ligand-free ball milling method for preparation of cesium lead tribromide (CsPbBr.sub.3) quantum dot is provided. First, mixing a Cs source, a Pb source, and a Br source as per a molar ratio of Cs source:Pb source:Br source is 1:1?6:1?9, and then adding polymethyl methacrylate (PMMA) to obtain a mixture. The mixture is milled for 1-2 hours at a rotation speed in a range of 360?630 revolutions per minute (r/min) in a ball milling device, obtaining CsPbBr.sub.3 quantum dot. The method has advantages such as simple process, easy industrial production, no solvent, no organic ligand, low cost, and environmental protection. A quantum yield of product obtained by the method is up to 78%, and the product has a strong environmental stability. A preparation temperature of the product is low, and the reaction can be completed at a room temperature without a high temperature treatment.

Described are luminescent components with excellent performance and stability. The luminescent components comprise a first element 1 including first luminescent crystals 11 from the class of perovskite crystals, embedded a first polymer P1 and a second element 2 comprising a second solid polymer composition, said second polymer composition optionally comprising second luminescent crystals 12 embedded in a second polymer P2. Polymers P1 and P2 differ and are further specified in the claims. Also described are methods for manufacturing such components and devices comprising such components.