Provided are a perovskite light emitting device containing an exciton buffer layer, and a method for manufacturing the same. A light emitting device of the present invention comprises: an exciton buffer layer in which a first electrode, a conductive layer disposed on the first electrode and comprising a conductive material, and a surface buffer layer containing fluorine-based material having lower surface energy than the conductive material are sequentially deposited; a light-emitting layer disposed on the exciton buffer layer and containing a perovskite light-emitter; and a second electrode disposed on the light-emitting layer. Accordingly, a perovskite is formed with a combined FCC and BSS crystal structure in a nanoparticle light-emitter. The present invention can also form a lamellar or layered structure in which an organic plane and an inorganic plane are alternatively deposited; and an exciton can be bound by the inorganic plane, thereby being capable of expressing high color purity.

An electronic device includes, a light source having a peak emission at a wavelength between about 440 nm to about 480 nm; and a photoconversion layer disposed on the light source, wherein the photoconversion layer includes a first quantum dot which emits red light and a second quantum dot which emits green light, wherein at least one of the first quantum dot and the second quantum dot has a perovskite crystal structure and includes a compound represented by Chemical Formula 1:
AB′X.sub.3+α  Chemical Formula 1 wherein A is a Group IA metal, NR.sub.4.sup.+, or a combination thereof, B′ is a Group IVA metal, X is a halogen, BF.sub.4.sup.−, or a combination thereof, and α is 0 to 3.

The present invention relates to a method for manufacturing a solar cell, the method comprising the steps of: preparing a substrate; forming an adhesive layer on the substrate; and forming, on the adhesive layer, a perovskite solar cell having a perovskite absorption layer, wherein an optical treatment step of providing light is performed at least once between the step of preparing the substrate and the step of forming the perovskite solar cell.

A light-emitting composition including: semiconductor fine particles as component (1); and a compound represented by Formula (X) or a modified product thereof as component (2). ##STR00001##

The present disclosure provides a method for preparing a perovskite quantum dot film by one-step crystallization, and belongs to the field of perovskite quantum dot material technology. The present disclosure uses adamantanemethylamine and hydrohalic acid as ligands, first mixes a cesium halide, a lead halide, and the ligands with a solvent to obtain a precursor solution, then deposits the precursor solution on a substrate, and then heats the substrate to obtain the CsPbX.sub.3 perovskite quantum dot film. The present disclosure uses adamantanemethylamine and hydrohalic acid as the ligands, which can quickly coat the perovskite, complex with the CsPbX.sub.3 perovskite, and directly form the perovskite quantum dot via a strong steric effect. Further, the present disclosure is simple and inexpensive, can directly obtain a high-quality perovskite quantum dot film with a thickness of more than 500 nm by one-step crystallization.

A light-emitting material including aminosiloxane and a light-emitting compound represented by Formula 1, a light-emitting device including the light-emitting material, a method of preparing the light-emitting material, and a method of preparing the light-emitting compound represented by Formula 1:

A.sup.1B.sup.1X.sup.1.sub.3,  Formula 1 wherein A.sup.1 may be an alkali metal, B.sup.1 may be Pb, Sn, or any combination thereof, and X.sup.1 may be a halogen.

The present invention relates to a mixture of a compound (1) and a compound (2). The compound (1) is a light-emitting perovskite compound which includes components A, B, and X, and the compound (2) is a light-emitting indium compound or light-emitting cadmium compound. The component A indicates a component positioned at each vertex of a hexahedron having the component B at the center in a perovskite type crystal structure and is a monovalent cation, the component X indicates a component positioned at each vertex of an octahedron having the component B at the center in the perovskite type crystal structure and is one or more kinds of anions selected from the group consisting of a halide ion and a thiocyanate ion, and the component B indicates a component positioned at the centers of the hexahedron where the component A is disposed at each vertex and the octahedron where the component X is disposed at each vertex in the perovskite type crystal structure and is a metal ion.

Described herein are materials comprising (1) a monomer or a polymer; (2) perovskite quantum dots interspersed in the monomer or the polymer, each of the perovskite quantum dots independently having the formula:

Cs.sub.a(MA).sub.b(FA).sub.cRb.sub.dPb.sub.pSn.sub.rBi.sub.sCl.sub.xBr.sub.yI.sub.z,

wherein: MA is CH.sub.3NH.sub.3; FA is HC(NH.sub.2).sub.2; a, b, c, and d are each independently a number from 0 to 1, provided that the sum of a, b, c, and d is 1; p, r, and s are each independently a number from 0 to 1, provided that the sum of p, r, and s is 1; and x, y, and z are each independently a number from 0 to 3, provided that the sum of x, y, and z is 3; and (3) an additive interspersed in the monomer or the polymer, the additive comprising: a halide-based additive; a light scattering agent having the formula: M.sub.2O.sub.3, wherein M is, at each occurrence, independently, a metal, provided that at most one instance of M is a group 13 element; or both. Also described are devices comprising such materials, as well as methods of forming such materials.

The present invention provides a perovskite microsphere material, a mixed-color light conversion film, preparation methods thereof, and a display. By using the red and green perovskite microspheres with the encapsulating structure provided by the present invention as an optical conversion material of the white OLED display, the photon utilization of organic light-emitting materials can be improved, display power consumption is reduced, and thus process difficulty and cost are decreased.

Disclosed are a preparation method for manganese-doped red phosphor, a device and a backlight module including the product. The method includes: 1) mixing A.sub.2BF.sub.6 polycrystalline particles with mill balls; 2) mixing A.sub.2BF.sub.6 powder obtained after ball-milling with a hydrofluoric acid for secondary crystallization; 3) filtering out solid particles in A.sub.2BF.sub.6 and hydrofluoric acid solution after the secondary crystallization; 4) performing ion exchange between A.sub.2BF.sub.6 particles and A.sub.2BF.sub.6; and 5) filtering out solid particles to obtain a filter cake, and performing drying treatment to obtain manganese-doped red phosphor.