Perovskite material including multi-functional asymmetric organic spacer and light-emitting device including the same

Abstract

The disclosed quasi-two-dimensional perovskite material comprises stacked perovskite slabs and an organic separator disposed between adjacent slabs. The organic separator comprises two or more different functional groups and has a geometrically and electrically asymmetric structure. Accordingly, the luminescence efficiency of the perovskite material can be increased by stabilizing the optically active state of the perovskite slabs.

Description

Technology Field

[0001] The present invention relates to a light-emitting material. More specifically, the present invention relates to a quasi-two-dimensional perovskite material comprising a multifunctional asymmetric organic separator and a light-emitting device comprising the same. Background Technology

[0002] Recently, as the role of light emitters has expanded from the metaverse industry, including augmented and virtual reality, to optical disease diagnosis and treatment, there is a demand for the development of light emitters with high color purity and luminescence efficiency. Among next-generation light emitter materials, perovskite materials have the advantages of being relatively simple to synthesize based on solution processes, easy bandgap tuning, and high color purity.

[0003] In particular, quasi-two-dimensional perovskites, which impart quantum and dielectric confinement effects by inserting organic molecules into perovskite crystals, can have higher stability and larger exciton binding energy compared to three-dimensional perovskites. In quasi-two-dimensional perovskites, the separator can take two forms: (1) an organic molecule containing one organic cation functional group is bound to one perovskite slab, or (2) an organic molecule containing two organic cation functional groups connects two perovskite slabs, and these are respectively called Ludlsen-Popper and Dion-Jakobson perovskites. Among these, the Dion-Jakobson perovskite has a higher charge mobility compared to the Ludlsen-Popper perovskite, but has a lower luminescence efficiency.

[0004] To increase the luminescence efficiency and stability of Dion-Jacobson perovskites, strategies such as passivating defects in the perovskite slab and aligning the orientation of the perovskite slab have been proposed. These conventional methods improve physical properties by suppressing the formation of energy traps by the binding of peroxides or water molecules to defects. However, according to these methods, the effect of improving the stability of the perovskite slab is minimal, and charge mobility deteriorates. Prior art literature

[0005] 1) Republic of Korea Patent Publication No. 2022-0078505 2) Republic of Korea Patent Publication No. 2022-0157149 3) U.S. Patent Publication No. 2022-0069236 The problem to be solved

[0006] One objective of the present invention is to provide a quasi-two-dimensional perovskite material having high luminous efficiency, stability, and charge mobility.

[0007] Another objective of the present invention is to provide a method for manufacturing the perovskite material.

[0008] Another objective of the present invention is to provide a light-emitting device comprising the perovskite material.

[0009] However, the problem that the present invention aims to solve is not limited to the problem mentioned above, and may be expanded in various ways without departing from the spirit and scope of the present invention. means of solving the problem

[0010] A quasi-two-dimensional perovskite material according to exemplary embodiments of the present invention for achieving one objective of the present invention described above comprises stacked perovskite slabs and an organic separator disposed between adjacent slabs. The organic separator comprises two or more different functional groups and has a geometrically and electrically asymmetric structure.

[0011] According to one embodiment, the organic separator comprises a linker and a first functional group and a second functional group bonded to different positions of the linker and having different structures, so that the dipole moment of the entire molecule is 0.1D to 20D.

[0012] According to one embodiment, the linker is an aromatic or aliphatic organic chain.

[0013] According to one embodiment, the organic separator comprises two or more different functional groups selected from isothioronium, thioronium, thioether, thioester, 1st to 4th organicammonium, pyridinium, piperidinium, 1st to 4th phosphonium, 1st to 3rd organicsulfonium, guanidinium, formamidinium, acyloxy, nitroso, imide, lactam, ester, nitrile, epoxy, azide, isothianate, cyanate, carbamate, dithiocarbamate, disulfide, derivatives thereof, organic cations generated as a result of protonation or deprotonation thereof, neutral functional groups, and organic anions.

[0014] According to one embodiment, the functional groups of the organic separator comprise at least an organic ammonium, an organic phosphonium, or an organic sulfonium.

[0015] According to one embodiment, the organic separator comprises at least one selected from the group consisting of 2-(2-aminoethyl)isothiourea (AIT), (2-aminoethyl)dithiocarbamic acid, 4-(2-aminoethyl)pyridine, (1-aminoethyl)isothiourea and 3-[(2-aminoethyl)thiomethyl]isothiazole thiourea and compounds produced as a result of the protonation thereof.

[0016] According to one embodiment, the perovskite slab comprises an organic-inorganic hybrid perovskite.

[0017] According to one embodiment, according to one embodiment, the quasi-two-dimensional perovskite material is A' x A n-1 B n X 3n+1It has the chemical formula, where A represents at least one of an alkali metal ion, an organic ammonium ion, and a derivative thereof, B represents at least one of a transition metal cation, an alkaline earth metal cation, and a rare earth metal cation, X represents at least one of a halogen anion and a pseudohalide anion, A' represents an organic separator, x is a real number from 1 to 2, and n is from 1 to 50.

[0018] A method for manufacturing a quasi-two-dimensional perovskite material according to one embodiment comprises the steps of: preparing a precursor solution comprising a perovskite precursor, an organic separator, and a solvent; and removing the solvent from the precursor solution. The organic separator comprises two or more different functional groups and has a geometrically and electrically asymmetric structure.

[0019] A light-emitting element according to one embodiment comprises a first electrode, a second electrode, and a light-emitting layer disposed between the first electrode and the second electrode and comprising a quasi-two-dimensional perovskite material. The quasi-two-dimensional perovskite material comprises stacked perovskite slabs and an organic separator disposed between adjacent slabs. The organic separator comprises two or more different functional groups and has a geometrically and electrically asymmetric structure. Effects of the invention

[0020] According to the exemplary embodiments of the present invention described above, the optically active state of the perovskite slab is stabilized by an asymmetric organic separator, thereby increasing the luminescence efficiency of the perovskite material.

[0021] In addition, the above-mentioned asymmetric organic separator can improve the photostability, thermal stability, and moisture stability of the perovskite material by sacrificially chemically reacting with light, heat, water vapor, etc.

[0022] Accordingly, the above perovskite material can have high stability, excellent luminous efficiency, and large charge mobility, and can be used in light-emitting devices to improve the external quantum efficiency, current efficiency, brightness, etc. of the device. Brief explanation of the drawing

[0023] FIG. 1 is a schematic diagram illustrating a quasi-two-dimensional organic-inorganic perovskite material according to one embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a light-emitting element according to one embodiment of the present invention. FIG. 3 is a graph showing the luminous efficiency of the light-emitting elements of Example 1, Comparative Example 1, and Comparative Example 2. Figure 4 is a graph showing the external quantum efficiency of the light-emitting devices of Example 1, Comparative Example 1, and Comparative Example 2. Specific details for implementing the invention

[0024] Hereinafter, perovskite materials and light-emitting elements according to embodiments of the present invention will be described in detail with reference to the attached drawings. Since the present invention is susceptible to various modifications and may take various forms, specific embodiments are illustrated and described in detail in the text. However, this is not intended to limit the present invention to specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. In the attached drawings, the dimensions of the structures may be depicted enlarged from the actual dimensions for the sake of clarity of the present invention.

[0025] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, or combinations thereof.

[0026] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0027] Quasi-two-dimensional organic-inorganic perovskite material

[0028] A perovskite material according to one embodiment of the present invention is an organic-inorganic perovskite material having a quasi-two-dimensional form.

[0029] FIG. 1 is a schematic diagram illustrating a perovskite material according to one embodiment of the present invention.

[0030] Referring to FIG. 1, a perovskite material (100) according to one embodiment of the present invention may include a multifunctional asymmetric organic separator (110) and a perovskite slab (120). Specifically, the perovskite material (100) may include a multifunctional asymmetric organic separator (110) disposed between stacked perovskite slabs (120).

[0031] The above-mentioned multifunctional asymmetric organic separator (110) can be placed between adjacent perovskite slabs (120) to induce quantum confinement and dielectric confinement effects on the perovskite slabs and to suppress the deterioration of the perovskite slabs by light, heat, water vapor, and water.

[0032] The above perovskite materials are A4BX6, ABX4, and A'2A n-1 B n X 3n+1 It may include ABX3 or a combination thereof. In the above chemical formulas, n is an integer between 2 and 99, A represents an alkali metal ion, an organic ammonium ion, a derivative thereof, or a combination thereof, B represents a transition metal cation, an alkaline earth metal cation, a rare earth metal cation, or a combination thereof, X represents a halogen anion, a pseudohalide anion, or a combination thereof, and A' represents an organic separator. For example, the organic ammonium ion may include methylammonium, formamidinium, guanidinium, or a combination thereof.

[0033] According to one embodiment, the perovskite material is at least A'2A n-1 B n X 3n+1 It includes, and optionally may further include A4BX6, ABX4, ABX3, or a combination thereof.

[0034] The above-described multifunctional asymmetric organic separator (110) may include an organic molecule comprising at least two different functional groups and a linker (112). For example, the above-described multifunctional asymmetric organic separator (110) may include different first functional groups (111a) and second functional groups (111b). The first functional group (111a) and the second functional group (111b) may each be attached to different locations on the linker (112).

[0035] As the first functional group (111a) and the second functional group have different chemical structures, the multifunctional asymmetric organic separator (110) may have a geometrically and electrically asymmetric structure. For example, the dipole moment of the entire molecule of the multifunctional asymmetric organic separator (110) may be 0.1D to 20D.

[0036] For example, the multifunctional asymmetric organic separator (110) may include two or more of the following as functional groups: isothioronium, thioronium, thioether, thioester, 1st to 4th organic ammonium, pyridinium, piperidinium, 1st to 4th phosphonium, 1st to 3rd organic sulfonium, guanidinium, formamidinium, acyloxy, nitroso, imide, lactam, ester, nitrile, epoxy, azide, isothianate, cyanate, carbamate, dithiocarbamate, disulfide, derivatives thereof, organic cations generated as a result of protonation or deprotonation thereof, neutral functional groups, and organic anions.

[0037] The first functional group (111a) and the second functional group (111b) may act as Lewis bases or Lewis acids, or a combination thereof, to passivate defects in the perovskite slab. The linker (112) may be an aromatic or aliphatic organic chain that may or may not contain heteroatoms and may contain at least two carbon atoms.

[0038] At least one of the first functional group (111a) and the second functional group (111b) can be bonded to the perovskite slab through at least one of chelation, hydrogen bonding, ionic bonding, coordination bonding, covalent bonding, and Coulomb force.

[0039] According to one embodiment, it may be preferable that at least one of the first functional group (111a) and the second functional group (111b) comprises an organic ammonium, an organic phosphonium, or an organic sulfonium. The organic ammonium, organic phosphonium, or organic sulfonium is relatively small in size and can be easily bonded to the perovskite slab.

[0040] A multifunctional asymmetric organic separator (110) according to one embodiment of the present invention has a dipole moment and is randomly aligned between adjacent slabs to induce asymmetry in the electrical potential. Accordingly, the Rashba effect in the perovskite slab can be increased. The Rashba effect can increase luminescence efficiency by stabilizing the triplet state, which is an optically active state, and destabilizing the singlet state, which is an optically inactive state.

[0041] However, if the Rasibah effect becomes excessively large, the perovskite bandgap may change from a direct bandgap to an indirect bandgap. In this case, as the process changes from a two-particle (electron + hole) process to a three-particle (electron + hole + phonon) process, the luminescence efficiency may decrease.

[0042] In consideration of this, a preferred example of the multifunctional asymmetric organic separator (110) may include 2-(2-aminoethyl)isothiourea (AIT), (2-aminoethyl)dithiocarbamic acid, 4-(2-aminoethyl)pyridine, (1-aminoethyl)isothiourea, 3-[(2-aminoethyl)thiomethyl]isothiazole thiourea, a compound formed as a result of the protonation of these, or a combination thereof. The compound formed as a result of the protonation may be a dihydrohalogenide.For example, compounds produced as a result of the protonation include 2-(2-aminoethyl)isothiourea dihydrobromide, (2-aminoethyl)dithiocarbamic acid dihydrobromide, 4-(2-aminoethyl)pyridine dihydrobromide, (1-aminoethyl)isothiourea dihydrobromide, 3-[(2-aminoethyl)thiomethyl]isothiazole thiourea dihydrobromide, 2-(2-aminoethyl)isothiourea dihydrochloride, (2-aminoethyl)dithiocarbamic acid dihydrochloride, 4-(2-aminoethyl)pyridine dihydrochloride, (1-aminoethyl)isothiourea dihydrochloride, 3-[(2-aminoethyl)thiomethyl]isothiazole thiourea dihydrochloride, 2-(2-aminoethyl)isothiourea dihydroiodide, (2-aminoethyl)dithiocarbamic acid dihydroiodide, It may include 4-(2-aminoethyl)pyridine dihydroiodide, (1-aminoethyl)isothiourea dihydroiodide, 3-[(2-aminoethyl)thiomethyl]isothiazole thiourea dihydroiodide, or a combination thereof.

[0043] According to one embodiment, the multifunctional asymmetric organic separator (110) may include AIT.

[0044] According to one embodiment, the perovskite slab (120) may include an organic-inorganic hybrid perovskite. For example, the perovskite slab (120) may include CH3NH3PbI3, CH3NH3PbBr3, CH3NH3PbCl3, and CH3NH3PbBr (3-o) I o , CH3NH3PbCl (3-o) Br o , CH3NH3PbCl (3-o) I o , CsPbI3, CsPbBr3, CH3CH2CH2CH2NH3PbBr3, NH2CHNH2PbBr3, NH2CHNH2PbBr (3-o) I o , or may include a combination thereof (o is a real number or integer greater than 0 and less than 3).

[0045] However, embodiments of the present invention are not limited thereto, and the perovskite slab (120) may include inorganic perovskites such as CsPbBr3.

[0046] For example, the perovskite slab (120) may have a two-dimensional shape. The thickness of the perovskite slab (120) may be 0.5 nm to 999 nm or 1 nm to 10 nm.

[0047] For example, when the perovskite slab (120) is used as a light-emitting material, it can produce photoluminescence with a wavelength of 200 nm to 1,300 nm and a full width at half maximum of the emission spectrum of 30 nm or less.

[0048] The perovskite material according to the embodiments of the present invention has a quasi-two-dimensional shape and includes a multifunctional asymmetric organic separator disposed between slabs.

[0049] The above perovskite material can have its luminescence efficiency increased by stabilizing its optically active state through the above asymmetric organic separator.

[0050] In addition, the above-mentioned asymmetric organic separator can improve the photostability, thermal stability, and moisture stability of the perovskite material by sacrificially chemically reacting with light, heat, water vapor, etc.

[0051] Accordingly, the above perovskite material can have high stability, excellent luminous efficiency, and large charge mobility, and can be used in light-emitting devices to improve the external quantum efficiency, current efficiency, brightness, etc. of the device.

[0052] The above perovskite material can be used in photoelectric conversion devices, such as solar cells, in addition to light-emitting devices. Furthermore, the above perovskite material is advantageous for maintaining charge carrier spins, so it may also be applied in the field of spintroics.

[0053] Method for manufacturing quasi-two-dimensional organic-inorganic perovskite materials

[0054] A perovskite material according to one embodiment of the present invention can be manufactured through a solution process, for example, by reducing the solubility of a solute in an organic solvent.

[0055] According to one embodiment, a precursor solution comprising a perovskite precursor and an organic separator is prepared. For example, the perovskite precursor may include a combination of metal halide precursors such as PbBr2, PbI2, etc., organic cation halide precursors such as methylammonium bromide, formamidinium bromide, etc., and cesium halide precursors. The organic separator may include the same material as the aforementioned multifunctional asymmetric organic separator.

[0056] For example, the solvent may include dimethylformamide, gamma butyrolactone, N-methylpyrrolidone, alkoxyethanol, methanol, ethanol, isopropanol, propanol, butanol, hexane, dimethyl sulfoxide, dichloroethylene, trichloroethylene, chloroform, chlorobenzene, dichlorobenzene, styrene, furan, tetrahydrofuran, xylene, toluene, cyclohexene, or a combination thereof.

[0057] According to one embodiment, the precursor solution is applied onto a base substrate to form a coating layer. Next, an antisolvent is provided to the precursor coating layer. Since the antisolvent reduces the solubility of the solute in the solution, it can replace the existing hydrophilic solvent and evaporate to form a quasi-two-dimensional perovskite thin film. The antisolvent may be selected according to the solvent and the precursor. For example, if the solvent contains dimethyl sulfoxide or gamma butyrolactone, dichlorobenzene, chloroform, ethyl acetate, etc., may be used as the antisolvent.

[0058] According to one embodiment, to improve the luminescence efficiency of the perovskite, the antisolvent may be provided together with a passivation material such as triphenylphosphine oxide.

[0059] The coating of the above precursor solution and the provision of the antisolvent can be performed through spin coating, blade coating, dip coating, spray coating, nozzle printing, roll-to-roll printing, etc.

[0060] As the above solvent is removed, a quasi-two-dimensional perovskite material having a perovskite slab and an organic separator can be obtained. The perovskite material may have the form of a colloidal nanocrystal, a single crystal, a single crystal thin film, a polycrystalline or polycrystalline thin film, and the thickness of the thin film or crystal may be 1 nm to 5 µm.

[0061] In one embodiment, an antisolvent was provided to remove the solvent, but the embodiments of the present invention are not limited thereto, and the solvent may be removed through drying or the like. Additionally, a precursor containing a ligand may be used to prepare the perovskite material in the form of colloidal nanocrystals.

[0062] Light-emitting device containing perovskite material

[0063] FIG. 2 is a cross-sectional view illustrating a light-emitting element according to one embodiment of the present invention.

[0064] Referring to FIG. 2, the light-emitting element includes a first electrode (20), a light-emitting layer (10), and a second electrode (30). A hole transport layer (50) may be disposed between the first electrode (20) and the light-emitting layer (10), and an electron transport layer (40) may be disposed between the second electrode (30) and the light-emitting layer (10). If necessary, the hole transport layer (50) may include a hole injection layer, and the electron transport layer (40) may include an electron injection layer. Additionally, at least one of the hole transport layer (50) and the electron transport layer (40) may be omitted.

[0065] The first electrode (20) may be an anode. For example, the first electrode (20) may include a metal oxide such as indium tin oxide, indium zinc oxide, fluorinated tin oxide, indium copper oxide, etc., or may include a metal such as nickel (Ni), platinum (Pt), gold (Au), silver (Ag), etc.

[0066] For example, the hole transport layer (50) is poly(3,4-ethylenedioxythiophene) (PEDOT:PSS), poly-N-vinylcarbazole, polyphenylene, polyparaphenylene, polymethacrylate derivative, poly(9,9-octylfluorene), poly(spirofluorene), poly-N,N-bis-4-butylphenyl-N,N-bis-phenylbenzidine (poly-TPD), N,N'-bis(naphthalene-1-yl)-N,N'-bis(phenyl)benzidine (NPB), 4,4'-bis(carbazole-9-yl)-biphenyl (CBP), hexaazatriphenylene hexacarbonitrile (HAT-CN), 4,4',4"-tris(3-methylphenylamino)triphenylamine (m-MTDATA), It may include poly(9,9'-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine (TFB), poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene](MEH-PPV), poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene](MDMO-PPV), tetrafluoro-tetracyanoquinodimethane (F4-TCNQ), or a combination thereof.

[0067] The light-emitting layer (10) may include a quasi-two-dimensional perovskite material having the aforementioned perovskite slab and organic separator.

[0068] For example, the electron transport layer (40) may comprise TiO2, ZnO, SiO2, SnO2, WO3, Ta2O3, BaTiO3, BaZrO3, ZrO2, HfO2, Al2O3, Y2O3, ZrSiO4, SnO2, 2,2',2"-(benzene-1,3,5-triyl)-tris(1-phenyl-1H-benzimidazole) (TPBi), 3-(4-biphenyl)-4-(phenyl-5-tert-butylphenyl-1,2,4-triazole) (TAZ) or a combination thereof.

[0069] The second electrode (30) may be a cathode. For example, the second electrode (30) may include calcium (Ca), barium (Ba), aluminum (Al), magnesium (Mg), silver (Ag), LiF, BaF2, or a combination thereof.

[0070] Below, we will examine the effects of the present invention through specific examples and experiments.

[0071] Example 1

[0072] A glass substrate with indium tin oxide deposited on it, measuring 2.5 cm * 0.7 cm, was treated with O2 / plasma, and then a solution of Nafion aqueous solution (Nafion 5 wt% in water), PEDOT:PSS (AI4083), and IPA (isopropyl alcohol) mixed in a ratio of 1:1:x (where x is a real number from 0 to 3) was applied, and then spin-coated at 4,500 rpm for more than 60 seconds to form a GraHIL (gradient hole injection layer) thin film with a thickness of 120 nm or less.

[0073] A perovskite precursor solution was prepared by dissolving PbBr2, AIT dihydrobromide (having organic ammonium functional groups and isothioronium functional groups), and methylammonium bromide in dimethyl sulfoxide at concentrations of 0.15 M, 0.115 M, and 0.3 M, respectively, and then applying the solution onto the ITO / GraHIL thin film. During spin coating of the solution at 5,000 rpm, dichlorobenzene was added dropwise as an antisolvent to form a perovskite thin film.

[0074] Next, the ITO / GraHIL / perovskite thin film was heated at 60 to 90°C to remove residual antisolvent and solvent. An electron transport layer was formed by depositing 50 nm of 2,2′,2"-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)(TPBi) on the perovskite thin film by thermal evaporation, and then 100 nm of Al was deposited by thermal evaporation to fabricate a light-emitting device having a comprehensive ITO / GraHIL / perovskite / TPBi / Al structure.

[0075] Comparative Example 1

[0076] A light-emitting device was fabricated in the same manner as in Example 1, except that BDA (Butane-1,4-diammonium bromide) having two primary organic ammonium functional groups was used instead of AIT dihydrobromide.

[0077] Comparative Example 2

[0078] A light-emitting device was fabricated in the same manner as in Example 1, except that PBI (S,S'-(1,3-PROPANEDIYL)BIS(ISOTHIOURONIUM BROMIDE)) having an isothioronium functional group without an organic ammonium functional group was used instead of AIT dihydrobromide.

[0079] FIG. 3 is a graph showing the luminous efficiency of the light-emitting devices of Example 1, Comparative Example 1, and Comparative Example 2, and FIG. 4 is a graph showing the external quantum efficiency of the light-emitting devices of Example 1, Comparative Example 1, and Comparative Example 2. The values ​​of the graphs were obtained for photoluminescence of a wavelength of 500 nm to 550 nm through photoexcitation of a wavelength of 360 nm.

[0080] Referring to FIGS. 3 and 4, it was confirmed that the light-emitting element (AIT) of Example 1 has much superior light-emitting efficiency and external quantum efficiency compared to the light-emitting element (BDA) of Comparative Example 1 and the light-emitting element (PBI) of Comparative Example 2.

[0081] As described above, although the present invention has been explained with reference to exemplary embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the invention as set forth in the following claims. Industrial applicability

[0082] Exemplary embodiments of the present invention may be used in display devices, light-emitting devices such as lighting, photoelectric conversion devices such as solar cells, electronic devices using spintronics, neuromorphic elements, decorations using external light, etc.

Claims

Claim 1 It includes organic separators disposed between stacked perovskite slabs and adjacent slabs, and overall A' x A n-1 B n X 3n+1 A quasi-two-dimensional perovskite material having the chemical formula, wherein A represents at least one of an alkali metal ion, an organic ammonium ion, and a derivative thereof, B represents at least one of a transition metal cation, an alkaline earth metal cation, and a rare earth metal cation, X represents at least one of a halogen anion and a pseudo-halide anion, A' represents the organic separator, x is a real number from 1 to 2, and n is from 1 to 50, wherein the organic separator comprises two or more different functional groups and has a geometrically and electrically asymmetric structure, and the functional groups of the organic separator comprise at least an organic ammonium, an organic phosphonium, or an organic sulfonium. Claim 2 In claim 1, the organic separator is a quasi-two-dimensional perovskite material comprising a linker and a first functional group and a second functional group bonded to different positions of the linker and having different structures, wherein the dipole moment of the entire molecule is 0.1D to 20D. Claim 3 In paragraph 2, the linker is a quasi-two-dimensional perovskite material that is an aromatic or aliphatic organic chain. Claim 4 delete Claim 5 delete Claim 6 A quasi-two-dimensional perovskite material according to claim 1, wherein the organic separator comprises at least one selected from the group consisting of 2-(2-aminoethyl)isothiourea (AIT), (2-aminoethyl)dithiocarbamic acid, 4-(2-aminoethyl)pyridine, (1-aminoethyl)isothiourea, 3-[(2-aminoethyl)thiomethyl]isothiazole thiourea and compounds formed as a result of the protonation thereof. Claim 7 In claim 1, the perovskite slab is a quasi-two-dimensional perovskite material comprising an organic-inorganic hybrid perovskite. Claim 8 delete Claim 9 A step of preparing a precursor solution comprising a perovskite precursor, an organic separator, and a solvent; and removing the solvent from the precursor solution to include an organic separator disposed between stacked perovskite slabs and adjacent slabs, and overall A' x A n-1 B n X 3n+1 A method for manufacturing a quasi-two-dimensional perovskite material having the chemical formula A, wherein A represents at least one of an alkali metal ion, an organic ammonium ion, and a derivative thereof; B represents at least one of a transition metal cation, an alkaline earth metal cation, and a rare earth metal cation; X represents at least one of a halogen anion and a pseudo-halide anion; A' represents the organic separator; x is a real number from 1 to 2; and n is from 1 to 50. The organic separator comprises two or more different functional groups and has a geometrically and electrically asymmetric structure, wherein the functional groups of the organic separator comprise at least an organic ammonium, an organic phosphonium, or an organic sulfonium. Claim 10 A method for preparing a quasi-two-dimensional perovskite material according to claim 9, wherein the organic separator comprises at least one selected from the group consisting of 2-(2-aminoethyl)isothiourea (AIT), (2-aminoethyl)dithiocarbamic acid, 4-(2-aminoethyl)pyridine, (1-aminoethyl)isothiourea, 3-[(2-aminoethyl)thiomethyl]isothiazole thiourea and compounds produced as a result of the protonation thereof. Claim 11 A method for preparing a quasi-two-dimensional perovskite material according to claim 9, wherein the solvent comprises at least one selected from the group consisting of dimethylformamide, gamma butyrolactone, N-methylpyrrolidone, alkoxyethanol, methanol, ethanol, isopropanol, propanol, butanol, hexane, dimethyl sulfoxide, dichloroethylene, trichloroethylene, chloroform, chlorobenzene, dichlorobenzene, styrene, furan, tetrahydrofuran, xylene, toluene, and cyclohexene. Claim 12 A method for manufacturing a quasi-two-dimensional perovskite material according to claim 9, wherein the step of removing the solvent comprises the step of providing an antisolvent to the precursor solution, wherein the solvent comprises at least one selected from the group consisting of dimethylformamide, alkoxyethanol, tetrahydrofuran, dimethyl sulfoxide, and gamma-butyrolactone, and the antisolvent comprises at least one selected from the group consisting of dichlorobenzene, chloroform, and ethyl acetate. Claim 13 A method for manufacturing a quasi-two-dimensional perovskite material according to claim 12, wherein the step of providing the antisolvent is performed through at least one of spin coating, blade coating, dip coating, spray coating, nozzle printing, and roll-to-roll printing. Claim 14 It comprises a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode and comprising a quasi-two-dimensional perovskite material, wherein the quasi-two-dimensional perovskite material comprises an organic separator disposed between stacked perovskite slabs and adjacent slabs, and overall A' x A n-1 B n X 3n+1 A light-emitting device having the chemical formula, wherein A represents at least one of an alkali metal ion, an organic ammonium ion, and a derivative thereof, B represents at least one of a transition metal cation, an alkaline earth metal cation, and a rare earth metal cation, X represents at least one of a halogen anion and a pseudo-halide anion, A' represents the organic separator, x is a real number from 1 to 2, and n is from 1 to 50, wherein the organic separator comprises two or more different functional groups and has a geometrically and electrically asymmetric structure, and the functional groups of the organic separator comprise at least an organic ammonium, an organic phosphonium, or an organic sulfonium. Claim 15 delete Claim 16 delete Claim 17 In claim 14, the organic separator comprises a linker and a first functional group and a second functional group bonded to different positions of the linker and having different structures, and the total dipole moment of the molecule is 0.1D to 20D, a light-emitting device. Claim 18 A light-emitting device according to claim 14, wherein the organic separator comprises at least one selected from the group consisting of 2-(2-aminoethyl)isothiourea (AIT), (2-aminoethyl)dithiocarbamic acid, 4-(2-aminoethyl)pyridine, (1-aminoethyl)isothiourea, 3-[(2-aminoethyl)thiomethyl]isothiazole thiourea and compounds formed as a result of the protonation thereof. Claim 19 In claim 14, the light-emitting device comprising an organic-inorganic hybrid perovskite, wherein the perovskite slab comprises an organic-inorganic hybrid perovskite. Claim 20 delete

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