Light-emitting device

Abstract

The present application provides a light-emitting device. The light-emitting device includes a first electrode; a second electrode; a micro-light-emitting device disposed between the first electrode and the second electrode; and a planarization layer disposed between the first electrode and the second electrode. The planarization layer is prepared by curing a composition containing an oligomeric compound containing a group represented by formula A, a group represented by formula B, a group represented by formula C, or any combination thereof:

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2020-0026791 filed on March 3, 2020, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] Embodiments relate to light emitting devices. Background Art

[0004] Light emitting devices (LEDs) have high light conversion efficiency and very low energy consumption, and are semi-permanent and environmentally friendly. In order to use an LED in a lighting or display device, the LED must be connected between a pair of electrodes that can power the LED.

[0005] In order to fix the LED on a pair of electrodes, an overcoat material is used for planarization.

[0006] Therefore, a planarization material that is suitable and stable for the driving conditions of LEDs is required. Summary of the invention

[0007] The embodiment provides a light emitting device including a planarization layer having high light resistance, high heat resistance, and a high planarization degree.

[0008] Various aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the disclosure.

[0009] According to an embodiment, a light emitting device comprises:

[0010] The first electrode,

[0011] a second electrode facing the first electrode, and

[0012] a micro light emitting device disposed between the first electrode and the second electrode, and a planarization layer disposed between the first electrode and the second electrode,

[0013] The micro-light emitting device may be a nano-LED having a nanometer unit size or a micro-LED having a micrometer unit size, and the planarization layer may be prepared by curing a composition comprising an oligomeric compound, wherein the oligomeric compound may comprise a group represented by formula A, a group represented by formula B, a group represented by formula C, or any combination thereof:

[0014] <Formula A>

[0015]

[0016] <Formula B>

[0017]

[0018] <Formula C>

[0019]

[0020] In Formula A to Formula C, X may be R 12 or [(SiO 3 / 2 R) 4+2n O], R and R 1 To R 12 can each independently be hydrogen, deuterium, halogen, amine group, epoxy group, cyclohexyl epoxy group, acryloyl group, methacryloyl group, thiol group, isocyanate group, nitrile group, nitro group, substituted or unsubstituted C 1 -C 60 Alkyl groups, substituted or unsubstituted C 2 -C 60 Alkenyl groups, substituted or unsubstituted C 1 -C 60 Alkoxy groups, substituted or unsubstituted C 3 -C 10 Cycloalkyl groups, substituted or unsubstituted C 1 -C 10 Heterocycloalkyl group, substituted or unsubstituted C 6 -C 60 Aryl group, substituted or unsubstituted C 1 -C 60 Heteroaryl groups, substituted or unsubstituted C 7 -C 12 Aralkyl groups, substituted or unsubstituted C 6 -C 60 An aryloxy group, or a substituted or unsubstituted C 6 -C 60 Arylthio group,

[0021] n may be an integer from 1 to 20, and

[0022] * indicates the binding site with the adjacent atom.

[0023] In an embodiment, the composition may further comprise a silicone resin.

[0024] In an embodiment, the composition may further comprise a cross-linking resin.

[0025] In an embodiment, the composition may further include a silane coupling agent.

[0026] In an embodiment, the composition may further comprise polymethylvinylsiloxane, poly(methylphenyl)siloxane, poly(phenylvinyl)-co-(methylvinyl)silsesquioxane, PDV-1635, PMV-9925, PVV-3522, or any combination thereof.

[0027] In an embodiment, the composition may further include a silsesquioxane copolymer, phenyl hydrogen silsesquioxane, dimethylsilyl phenyl ether, or any combination thereof.

[0028] In an embodiment, the composition may further include a sulfide-based silane compound, a mercapto-based silane compound, a vinyl-based silane compound, an amino-based silane compound, a glycidyloxy-based silane compound, a nitro-based silane compound, a chlorine-based silane compound, a methacryloyl-based silane compound, or any combination thereof.

[0029] In an embodiment, the composition may further include a siloxane resin, a crosslinking resin and a silane coupling agent. Based on the total composition, the composition may include the oligomeric compound in an amount of about 1 wt % to about 20 wt %, the siloxane resin in an amount of about 30 wt % to about 85 wt %, the crosslinking resin in an amount of about 5 wt % to about 50 wt %, and the silane coupling agent in an amount of about 0.05 wt % to about 10 wt %.

[0030] In an embodiment, the micro light emitting device may have a size of about 0.1 μm to about 10 μm.

[0031] In an embodiment, the planarization layer may be prepared by curing the composition, and the curing temperature of the composition may be about 150°C to about 200°C.

[0032] In embodiments, the composition may contain no solvent.

[0033] In embodiments, the composition may further comprise a free radical scavenger. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other aspects, features and advantages of the embodiments of the present disclosure will become more apparent from the description taken in conjunction with the accompanying drawings, in which:

[0035] Figure 1 is a schematic diagram showing the structure of a light emitting device according to the embodiment;

[0036] Figure 2 is a graph showing retention rates after a vacuum process and after a curing process, each of which is after a coating process performed on a composition according to an embodiment;

[0037] Figure 3 is a schematic diagram showing a method of measuring the degree of flattening;

[0038] Figure 4 is a graph showing a value and b value and a curve for a case where a composition according to an embodiment is applied to a thickness of 3 μm;

[0039] Figure 5 is a graph showing the degree of planarization calculated based on the measured values ​​for the cases where the composition according to the embodiment is applied to thicknesses of 3 μm, 5 μm, and 7 μm, respectively; and

[0040] Figure 6 is a graph showing changes in light characteristics (transmittance, yellow index) of the light emitting device (3,000 nits, 60° C.) according to the embodiment observed for 1,000 hours. DETAILED DESCRIPTION

[0041] Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein the same reference numerals refer to the same elements throughout. In this regard, the embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Therefore, the embodiments are described below only by reference to the accompanying drawings to explain the aspects of the description.

[0042] As used herein, the term "and / or" includes any and all combinations of one or more than one of the associated listed items. For example, "A and / or B" may be understood to mean "A, B, or A and B". The terms "and" and "or" may be used in the sense of conjunctions or disjunctions and may be understood to be equivalent to "and / or". Throughout the disclosure, the expression "at least one of A, B, and C" may mean only A, only B, only C, both A and B, both A and C, both B and C, all of A, B, and C, or variations thereof.

[0043] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. The same or corresponding components will be denoted by the same reference numerals, and thus redundant descriptions thereof will be omitted.

[0044] As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0045] It should be further understood that the terms "comprises", "comprising", "includes", "including", "contains" and / or "containing" used herein indicate the presence of specified features or components, but do not exclude the presence or addition of one or more other features or components.

[0046] It should be understood that when a layer, region or component is referred to as being "on" or "over" another layer, region or component, it may be formed directly or indirectly on the other layer, region or component. For example, there may be intervening layers, regions or components.

[0047] As used herein, the term "about" or "approximately" includes the specified value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art taking into account the relevant measurements and the errors associated with the measurement of the particular quantity (i.e., the limits of the measurement system). For example, "about" can mean within one or more than one standard deviation, or within ±20%, ±10%, or ±5% of the specified value.

[0048] For convenience of explanation, the sizes of elements in the drawings may be exaggerated. In other words, since the sizes and thicknesses of components in the drawings are arbitrarily illustrated for convenience of explanation, the following embodiments of the present disclosure are not limited thereto.

[0049] According to aspects of the present disclosure, a light-emitting device may include: a first electrode; a second electrode facing the first electrode; a micro-light-emitting device arranged between the first electrode and the second electrode; and a planarization layer arranged between the first electrode and the second electrode, wherein the planarization layer is prepared by curing a composition comprising an oligomeric compound containing a group represented by formula A, a group represented by formula B, a group represented by formula C, or any combination thereof.

[0050] In an embodiment, the first electrode may be an anode, and the second electrode may be a cathode. Between the first electrode and the second electrode, a micro light emitting device may be provided.

[0051] Figure 1 is a schematic diagram showing the structure of a light emitting device according to the embodiment.

[0052] refer to Figure 1 , the light emitting device according to the embodiment may include a micro-LED between an anode and a cathode.

[0053] The micro-LED may be aligned on the anode, for example, in a one-transfer manner. Before forming the cathode, after the micro-LED is aligned in a one-transfer manner, an overcoat process for planarization may be required.

[0054] The planarization layer formed by the overcoating process may be used not only to planarize the micro-LED but also to fix the micro-LED.

[0055] In order not to damage the micro-LED, the planarization layer may need to be prepared by a low temperature process. In order to fix the micro-LED by maintaining alignment and to achieve a cathode formation process, the planarization layer may be required to have a high retention rate and a high planarization degree.

[0056] The material for forming the planarization layer needs to have high light resistance and high heat resistance to be stable to high-intensity light (eg, blue light) and heat, respectively.

[0057] [Planarization layer]

[0058] In an embodiment, the planarization layer may be formed by curing a composition including an oligomeric compound containing a group represented by Formula A, a group represented by Formula B, a group represented by Formula C, or any combination thereof:

[0059] <Formula A>

[0060]

[0061] <Formula B>

[0062]

[0063] <Formula C>

[0064]

[0065] In Formula A to Formula C, X may be R 12 or [(SiO 3 / 2 R) 4+2n O], R and R 1 To R 12 can each independently be hydrogen, deuterium, halogen, amine group, epoxy group, cyclohexyl epoxy group, acryloyl group, methacryloyl group, thiol group, isocyanate group, nitrile group, nitro group, substituted or unsubstituted C 1 -C 60 Alkyl groups, substituted or unsubstituted C 2 -C 60 Alkenyl groups, substituted or unsubstituted C 1 -C 60 Alkoxy groups, substituted or unsubstituted C 3 -C 10 Cycloalkyl groups, substituted or unsubstituted C 1 -C 10 Heterocycloalkyl group, substituted or unsubstituted C 6 -C60 Aryl group, substituted or unsubstituted C 1 -C 60 Heteroaryl groups, substituted or unsubstituted C 7 -C 12 Aralkyl groups, substituted or unsubstituted C 6 -C 60 An aryloxy group, or a substituted or unsubstituted C 6 -C 60 Arylthio group,

[0066] n may be an integer from 1 to 20, and

[0067] * indicates the binding site with the adjacent atom.

[0068] In an embodiment, C 1 -C 60 Alkyl group, C 2 -C 60 Alkenyl group, C 1 -C 60 Alkoxy groups, C 3 -C 10 Cycloalkyl groups, C 1 -C 10 Heterocycloalkyl group, C 6 -C 60 Aryl group, C 1 -C 60 Heteroaryl groups, C 7 -C 12 Aralkyl group, C 6 -C 60 Aryloxy groups and C 6 -C 60 The arylthio groups may each independently be substituted with deuterium, halogen, amine, epoxy group, cyclohexylepoxy group, acryloyl group, methacryloyl group, thiol group, isocyanate group, nitrile group, nitro group or phenyl group.

[0069] In embodiments, n may be 4 or 5 on average.

[0070] In an embodiment, the oligomeric compound may include at least two groups represented by Formula A to Formula C.

[0071] In an embodiment, the oligomeric compound may be represented by the following Formula 1:

[0072] <Formula 1>

[0073]

[0074] In Formula 1, A may be a group represented by Formula A, C may be a group represented by Formula C, and R21 To R 24 can be independently compared with R 1 The same as defined above, a may be an integer from 3 to 1,000, and c may be an integer from 1 to 500.

[0075] In an embodiment, the oligomeric compound may be represented by the following Formula 2:

[0076] <Formula 2>

[0077]

[0078] In Formula 2, A may be a group represented by Formula A, C may be a group represented by Formula C, and R 25 To R 28 can be independently compared with R 1 As defined above, a may be an integer from 3 to 1,000, and c and c′ may each independently be an integer from 1 to 500.

[0079] In an embodiment, the oligomeric compound may be represented by the following Formula 3:

[0080] <Formula 3>

[0081]

[0082] In Formula 3, A may be a group represented by Formula A, B may be a group represented by Formula B, C may be a group represented by Formula C, and R 29 and R 30 can be independently compared with R 1 The same as defined above, X' may be independently the same as defined with respect to X, a may be an integer from 3 to 1,000, b may be an integer from 1 to 500, and c may be an integer from 1 to 500. X and X' may be the same as or different from each other.

[0083] In an embodiment, the oligomeric compound may be represented by the following Formula 4:

[0084] <Formula 4>

[0085]

[0086] In Formula 4, A may be a group represented by Formula A, B may be a group represented by Formula B, C may be a group represented by Formula C, and R 31 To R 34 can be independently compared with R 1 As defined above, a may be an integer from 3 to 1,000, b may be an integer from 1 to 500, and c and c′ may each independently be an integer from 1 to 500.

[0087] In an embodiment, the oligomeric compound may be represented by the following Formula 5:

[0088] <Formula 5>

[0089]

[0090] In Formula 5, A may be a group represented by Formula A, B may be a group represented by Formula B, C may be a group represented by Formula C, and R 35 To R 38 can be independently compared with R 1 As defined above, a and a′ may each independently be an integer from 3 to 1,000, b may be an integer from 1 to 500, and c may be an integer from 1 to 500.

[0091] In an embodiment, the oligomeric compound may be represented by the following Formula 6:

[0092] <Formula 6>

[0093]

[0094] In Formula 6, A may be a group represented by Formula A, B may be a group represented by Formula B, C may be a group represented by Formula C, and R 39 To R 42 can be independently compared with R 1 As defined above, a and a′ may each independently be an integer from 3 to 1,000, b may be an integer from 1 to 500, and c and c′ may each independently be an integer from 1 to 500.

[0095] In an embodiment, the oligomeric compound may be represented by the following Formula 7:

[0096] <Formula 7>

[0097]

[0098] In Formula 7, A may be a group represented by Formula A, B may be a group represented by Formula B, C may be a group represented by Formula C, and R 43 To R 46 can be independently compared with R 1 As defined above, a and a′ may each independently be an integer from 3 to 1,000, b and b′ may each independently be an integer from 1 to 500, and c may be an integer from 1 to 500.

[0099] In an embodiment, the oligomeric compound can have a weight average molecular weight of about 1,000 to about 1,000,000. For example, the oligomeric compound can have a weight average molecular weight of about 5,000 to about 100,000. For example, the oligomeric compound can have a weight average molecular weight of about 7,000 to about 50,000. When the oligomeric compound has a weight average molecular weight within the above range, the processability and physical properties of the oligomeric compound can be improved simultaneously.

[0100] Considering that the synthetic product of cage-type polyhedral oligomeric silsesquioxane (POSS) is in powder form and used in the composition, POSS has poor compatibility with the siloxane resin used as the main resin. Therefore, POSS is not suitable for the preparation of the composition, and in order to increase the compatibility with the siloxane resin, a dissolution process in a solvent is necessary.

[0101] However, when the solvent evaporates through vacuum and curing process, it may cause very low flatness, so that the subsequent electrode formation process (eg cathode formation process) cannot be smoothly performed. Although the cathode is formed, the efficiency of the complete light emitting device including the cathode may drop rapidly.

[0102] Considering that the oligomeric compound according to the embodiment is not a complete cage compound, compatibility with the siloxane resin may be increased, so that a solvent-free process may be performed, and a planarization layer may be obtained through a condensation reaction.

[0103] Therefore, in the absence of a solvent to be evaporated, only volatile by-products formed by the condensation reaction and having a small molecular weight may be removed, and thus, the formed planarization layer may have a high degree of planarization.

[0104] In an embodiment, in addition to the oligomeric compound, the composition may further include a siloxane resin, a crosslinking resin, a silane coupling agent, etc. The composition may further include a catalyst or a reaction retarder.

[0105] In an embodiment, the silicone resin may include polymethylvinylsiloxane, poly(methylphenyl)siloxane, poly(phenylvinyl)-co-(methylvinyl)silsesquioxane, PDV-1635 (Gelest Company), PMV-9925 (Gelest Company), PVV-3522 (Gelest Company), or any combination thereof.

[0106] In an embodiment, the crosslinking resin may include a silsesquioxane copolymer, phenyl hydrogen silsesquioxane, dimethylsilyl phenyl ether, or any combination thereof.

[0107] In an embodiment, the coupling agent may include a sulfide-based silane compound, a mercapto-based silane compound, a vinyl-based silane compound, an amino-based silane compound, a glycidyloxy-based silane compound, a nitro-based silane compound, a chlorine-based silane compound, a methacryloyl-based silane compound, or any combination thereof.

[0108] In an embodiment, the sulfide-based silane compound may be selected from bis(3-triethoxysilylpropyl)tetrasulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(4-triethoxysilylbutyl)tetrasulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, bis(4-trimethoxysilylbutyl)tetrasulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, trisulfide, bis(2-triethoxysilylethyl) trisulfide, bis(4-triethoxysilylbutyl) trisulfide, bis(3-trimethoxysilylpropyl) trisulfide, bis(2-trimethoxysilylethyl) trisulfide, bis(4-trimethoxysilylbutyl) trisulfide, bis(3-triethoxysilylpropyl) disulfide, bis(2-triethoxysilylethyl) trisulfide, bis(4-triethoxysilylbutyl) disulfide, bis(3-trimethoxysilylpropyl) disulfide, bis(2-trimethoxysilylethyl) disulfide, bis(4-trimethoxysilylbutyl) disulfide, 3-trimethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-triethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide 2-Trimethoxysilylethyl-N,N-dimethylthiocarbamoyl tetrasulfide, 2-trimethoxysilylethyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-trimethoxysilylpropylbenzothiazolyl tetrasulfide, 3-triethoxysilylpropylbenzothiazolyl tetrasulfide, 3-trimethoxysilylpropylmethacrylate monosulfide or any mixture thereof.

[0109] In an embodiment, the mercapto-based silane compound may be selected from 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, or any mixture thereof.

[0110] In an embodiment, the vinyl-based silane compound may be selected from vinyltriethoxysilane, vinyltrimethoxysilane, or any mixture thereof.

[0111] In an embodiment, the amino-based silane compound may be selected from 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-(2-aminoethyl)aminopropyltriethoxysilane, 3-(2-aminoethyl)aminopropyltrimethoxysilane, or any mixture thereof.

[0112] In an embodiment, the glycidoxy-based silane compound may be selected from γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, or any mixture thereof.

[0113] In an embodiment, the nitro-based silane compound may be selected from 3-nitropropyltrimethoxysilane, 3-nitropropyltriethoxysilane, or any mixture thereof.

[0114] In an embodiment, the chlorine-based silane compound may be selected from 3-chloropropyltrimethoxysilane, 3-chloropropyltriethoxysilane, 2-chloroethyltrimethoxysilane, 2-chloroethyltriethoxysilane, or any mixture thereof.

[0115] In an embodiment, the methacryl-based silane compound may be selected from γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyldimethylmethoxysilane, or any mixture thereof.

[0116] In an embodiment, the composition may further include a siloxane resin, a cross-linked resin, and a silane coupling agent. Based on the total composition, the composition may include an oligomeric compound in an amount of about 1 wt % to about 20 wt %, a siloxane resin in an amount of about 30 wt % to about 85 wt %, a cross-linked resin in an amount of about 5 wt % to about 50 wt %, and a silane coupling agent in an amount of about 0.05 wt % to about 10 wt %. When the amount of the oligomeric compound, the siloxane resin, the cross-linked resin, and the silane coupling agent is within the above range, the planarization layer formation process can be easily performed, and the planarization layer thus prepared can have excellent properties.

[0117] In an embodiment, the planarization layer may be prepared by curing the composition. The curing temperature may be about 150° C. to about 200° C. For example, the curing temperature may be about 170° C. to about 190° C.

[0118] The curing temperature within the above range will not cause any damage to the micro-light emitting device.

[0119] In an embodiment, the planarization layer forming composition may contain substantially no solvent.

[0120] In an embodiment, the composition may further include a free radical scavenger. The free radical scavenger may be, for example, a cyclic secondary amine compound.

[0121] In embodiments, the composition may not include free radical scavengers.

[0122] In an embodiment, the free radical scavenger may be the following compound 300:

[0123]

[0124] In embodiments, the amount of free radical scavenger may be from about 2,000 ppm to about 3,000 ppm.

[0125] [Micro-light-emitting device]

[0126] The micro light emitting device may be a nano-LED having a nano-unit size or a micro-LED having a micro-unit size.

[0127] The micro light emitting device may include a first semiconductor layer, a second semiconductor layer, and an active layer disposed between the first semiconductor layer and the second semiconductor layer.

[0128] The first semiconductor layer, the active layer, and the second semiconductor layer may be sequentially stacked in a longitudinal direction of the micro light emitting device.

[0129] For example, the first semiconductor layer may include an n-type semiconductor layer, and the second semiconductor layer may include a p-type semiconductor layer. Such semiconductor layers may include a semiconductor layer having In x Al y Ga 1-x-y Semiconductor materials of the formula N (wherein 0≤x≤1, 0≤y≤1 and 0≤x+y≤1), such as GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, etc.

[0130] The first semiconductor layer may be doped with an n-type dopant, such as Si, Ge, Sn, or the like, and the second semiconductor layer may be doped with a p-type dopant, such as Mg, Zn, Ca, Sr, Ba, or the like.

[0131] For example, the first semiconductor layer may include a p-type semiconductor layer, and the second semiconductor layer may include an n-type semiconductor layer.

[0132] The active layer may be disposed between the first semiconductor layer and the second semiconductor layer, and may be formed, for example, as a single quantum well structure or a multi-quantum well structure. The active layer is a region where electrons and holes recombine, and when the electrons and holes recombine, the active layer transitions to a low energy level, thereby generating light having a wavelength corresponding thereto. When the active layer is included in a typical LED for lighting, display, etc., the active layer may be used without restriction. The active layer may be positioned differently depending on the type of light emitting device.

[0133] The embodiment is not limited to the embodiment described above, and in the embodiment, the micro-light-emitting device may further include a separate fluorescent layer, a separate active layer, a separate semiconductor layer and / or a separate electrode layer on the upper or lower part of the first semiconductor layer and the second semiconductor layer. The light generated from the active layer can be emitted to the outer surface and / or both side surfaces of the micro-light-emitting device.

[0134] In an embodiment, the micro light emitting device may further include a first electrode layer disposed under the first semiconductor layer and a second electrode layer disposed on the second semiconductor layer.

[0135] The first electrode layer and the second electrode layer may each be used as an ohmic contact electrode. However, the first electrode layer and the second electrode layer are not limited thereto, and may each be used as a Schottky contact electrode. The first electrode layer and the second electrode layer may include, for example, one or more metals selected from aluminum, titanium, indium, gold, and silver. The materials included in the first electrode layer and the second electrode layer may be the same or different from each other.

[0136] The micro light emitting device may further include an insulating film surrounding its outer surface. Since the insulating film protects the outer surface of the light emitting device including the outer surface of the active layer, the reduction of the light emitting efficiency can be prevented. The insulating film may cover the entire outer surface of the light emitting device, or may cover only a portion of the outer surface of the light emitting device.

[0137] The micro light emitting device may have various shapes, such as a cylinder, a cube, etc. For example, the micro light emitting device may have a cylindrical shape.

[0138] For example, the micro light emitting device may have a diameter of about 0.1 μm to about 1 μm and a length of about 0.1 μm to about 10 μm, but the embodiment is not limited thereto.

[0139] The micro-light emitting devices can emit red, green or blue light.

[0140] [Definition of Substituent]

[0141] In the following definitions of substituents, carbon number ranges are merely illustrative.

[0142] As used herein, the term "C1 -C 60 The term "alkyl group" refers to a linear or branched aliphatic saturated hydrocarbon monovalent group having 1 to 60 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an isopentyl group, and a hexyl group. In some embodiments, C 1 -C 60 The alkyl group may be C 1 -C 30 Alkyl group, C 1 -C 20 Alkyl group or C 1 -C 10 As used herein, the term "C 1 -C 60 "Alkylene group" refers to a group having 1 -C 60 A divalent group of the same structure as an alkyl group.

[0143] As used herein, the term "C 2 -C 60 "Alkenyl group" means a 2 -C 60 The alkyl group is a hydrocarbon group having at least one carbon-carbon double bond in the middle or at the end thereof, and examples thereof include a vinyl group, a propenyl group, and a butenyl group. 2 -C 60 The alkenyl group may be C 2 -C 30 Alkenyl group, C 2 -C 20 Alkenyl group or C 2 -C 10 As used herein, the term "C 2 -C 60 "Alkenylene group" refers to a 2 -C 60 Alkenyl groups are divalent groups of the same structure.

[0144] As used herein, the term "C 2 -C 60 "Alkynyl group" means a 2 -C 60 The alkyl group has at least one hydrocarbon group having a carbon-carbon triple bond in the middle or at the terminal, and examples thereof include an ethynyl group and a propynyl group. 2 -C 60 The alkynyl group may be C 2 -C 30 Alkynyl group, C 2 -C20 Alkynyl group or C 2 -C 10 As used herein, the term "C 2 -C 60 "Alkyne group" refers to a 2 -C 60 Alkynyl groups are divalent groups of the same structure.

[0145] As used herein, the term "C 1 -C 60 "Alkoxy group" refers to a group consisting of -OA 101 (A 101 C 1 -C 60 The invention further comprises a monovalent group represented by an alkyl group (eg, an alkyl group), and examples thereof include a methoxy group, an ethoxy group and an isopropoxy group.

[0146] As used herein, the term "C 3 -C 10 The term "cycloalkyl group" as used herein refers to a monovalent saturated hydrocarbon monocyclic group having 3 to 10 carbon atoms, and examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. 3 -C 10 "Cycloalkylene group" refers to a group having a 3 -C 10 Cycloalkyl groups are divalent groups of the same structure.

[0147] As used herein, the term "C 1 -C 10 The term “heterocycloalkyl group” refers to a monovalent monocyclic group having at least one heteroatom (e.g., 1 to 5 or 1 to 3 heteroatoms, such as 1, 2, 3, 4 or 5 heteroatoms) selected from N, O, Si, P and S as a ring-forming atom and 1 to 10 carbon atoms, and examples thereof include a 1,2,3,4-oxatriazolidinyl group, a tetrahydrofuranyl group and a tetrahydrothienyl group. As used herein, the term “C 1 -C 10 The term "heterocycloalkylene group" refers to a 1 -C 10 Heterocycloalkyl groups are divalent groups of the same structure.

[0148] As used herein, the term "C 3 -C 10 The term "cycloalkenyl group" as used herein refers to a monovalent monocyclic group having 3 to 10 carbon atoms and at least one carbon-carbon double bond in its ring and having no aromaticity, and examples thereof include a cyclopentenyl group, a cyclohexenyl group and a cycloheptenyl group. 3 -C10 "Cycloalkenylene group" refers to a group having a 3 -C 10 Cycloalkenyl groups are divalent groups of the same structure.

[0149] As used herein, the term "C 1 -C 10 The term "heterocycloalkenyl group" refers to a monovalent monocyclic group having at least one heteroatom (e.g., 1 to 5 or 1 to 3 heteroatoms, e.g., 1, 2, 3, 4 or 5 heteroatoms) selected from N, O, Si, P and S as a ring atom, 1 to 10 carbon atoms and at least one double bond in its ring. 1 -C 10 Examples of heterocycloalkenyl groups include 4,5-dihydro-1,2,3,4-oxatriazolyl groups, 2,3-dihydrofuranyl groups and 2,3-dihydrothienyl groups. 1 -C 10 The term "heterocycloalkenylene group" refers to a 1 -C 10 Heterocycloalkenyl groups are divalent groups of the same structure.

[0150] As used herein, the term "C 6 -C 60 "Aryl group" refers to a monovalent group having a carbocyclic aromatic system containing 6 to 60 carbon atoms, and the term "C 6 -C 60 The term "arylene group" refers to a divalent group having a carbocyclic aromatic system containing 6 to 60 carbon atoms. 6 -C 60 Examples of the aryl group include a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group and In some embodiments, C 6 -C 60 The aryl group may be C 6 -C 30 Aryl group, C 6 -C 24 Aryl group or C 6 -C 18 Aryl group. When C 6 -C 60 Aryl groups and C 6 -C 60 When the arylene groups each include two or more rings, the two or more rings may be fused to each other.

[0151] As used herein, the term "C 1 -C 60The term "heteroaryl group" refers to a monovalent group having a heterocyclic aromatic system containing, in addition to 1 to 60 carbon atoms, at least one heteroatom (e.g., 1 to 5 or 1 to 3 heteroatoms, e.g., 1, 2, 3, 4 or 5 heteroatoms) selected from N, O, Si, P and S as a ring-forming atom. As used herein, the term "C 1 -C 60 The term "heteroarylene group" refers to a divalent group having a heterocyclic aromatic system which contains, in addition to 1 to 60 carbon atoms, at least one heteroatom (e.g., 1 to 5 or 1 to 3 heteroatoms, e.g., 1, 2, 3, 4 or 5 heteroatoms) selected from N, O, Si, P and S as a ring-forming atom. 1 -C 60 Examples of heteroaryl groups include pyridyl groups, pyrimidinyl groups, pyrazinyl groups, pyridazinyl groups, triazinyl groups, quinolyl groups, and isoquinolyl groups. 1 -C 60 The heteroaryl group may be C 1 -C 30 Heteroaryl groups, C 1 -C 24 Heteroaryl groups or C 1 -C 18 Heteroaryl group. 1 -C 60 Heteroaryl groups and C 1 -C 60 When the heteroarylene groups each include two or more rings, the two or more rings may be fused to each other.

[0152] As used herein, the term "C 6 -C 60 "Aryloxy group" refers to -OA 102 (A 102 C 6 -C 60 aryl group), and as used herein, the term "C 6 -C 60 "Arylthio group" refers to -SA 103 (A 103 C 6 -C 60 aryl group).

[0153] As used herein, the term "monovalent non-aromatic fused polycyclic group" refers to a monovalent group (e.g., having 8 to 60 carbon atoms, such as 8 to 30 or 8 to 24 carbon atoms) having two or more rings fused to each other, having only carbon atoms as ring atoms, and having no aromaticity in its entire molecular structure. A specific example of a monovalent non-aromatic fused polycyclic group is a fluorenyl group. As used herein, the term "divalent non-aromatic fused polycyclic group" refers to a divalent group having the same structure as a monovalent non-aromatic fused polycyclic group.

[0154] The term "monovalent non-aromatic fused heteropolycyclic group" as used herein refers to a monovalent group (e.g., having 1 to 60 carbon atoms, such as 1 to 30 or 1 to 24 carbon atoms) having two or more rings fused to each other, at least one heteroatom (e.g., 1 to 5 or 1 to 3 heteroatoms, such as 1, 2, 3, 4 or 5 heteroatoms) selected from N, O, Si, P and S other than carbon atoms as ring-forming atoms, and having no aromaticity in its entire molecular structure. An example of a monovalent non-aromatic fused heteropolycyclic group is a carbazolyl group. The term "divalent non-aromatic fused heteropolycyclic group" as used herein refers to a divalent group having the same structure as a monovalent non-aromatic fused heteropolycyclic group.

[0155] As used herein, the term "C 5 -C 60 "Carbocyclic group" refers to a monocyclic group or a polycyclic group containing only carbon as a ring atom and consisting of 5 to 60 carbon atoms. 5 -C 60 The carbocyclic group may be an aromatic carbocyclic group or a non-aromatic carbocyclic group. 5 -C 60 The carbocyclic group can be a ring (e.g., benzene), a monovalent group (e.g., a phenyl group), or a divalent group (e.g., a phenylene group). In one or more than one embodiments, depending on the group attached to C 5 -C 60 The number of substituents in a carbocyclic group, C 5 -C 60 The carbocyclic group may be a trivalent group or a tetravalent group. 5 -C 60 The carbocyclic group may be C 5 -C 30 Carbocyclic group, C 5 -C 24 Carbocyclic group or C 5 -C 18 Carbocyclic group.

[0156] As used herein, the term "C 1 -C 60"Heterocyclic group" refers to a 5 -C 60 The invention relates to a carbocyclic group having the same structure as a carbocyclic group, but in addition to carbon (the number of carbon atoms can be 1 to 60, such as 1 to 30 or 1 to 24 carbon atoms), at least one heteroatom (e.g., 1 to 5 or 1 to 3 heteroatoms, such as 1, 2, 3, 4 or 5 heteroatoms) selected from N, O, Si, P and S is used as a ring-forming atom.

[0157] As used herein, the term "C 7 -C 12 The "aralkyl group" refers to a group having an aryl portion and an alkyl portion, and the aryl group of the aryl portion and the alkyl group of the alkyl portion are the same as described above. Nonlimiting examples of the aralkyl group include a benzyl group, a phenethyl group and a phenylpropyl group.

[0158] In this specification, substituted C 5 -C 60 Carbocyclic groups, substituted C 1 -C 60 Heterocyclic groups, substituted C 3 -C 10 Cycloalkylene groups, substituted C 1 -C 10 Heterocycloalkylene groups, substituted C 3 -C 10 Cycloalkenylene groups, substituted C 1 -C 10 Heterocycloalkenylene groups, substituted C 6 -C 60 Arylene groups, substituted C 1 -C 60 Heteroarylene group, substituted divalent non-aromatic condensed polycyclic group, substituted divalent non-aromatic condensed heteropolycyclic group, substituted C 1 -C 60 Alkyl groups, substituted C 2 -C 60 Alkenyl groups, substituted C 2 -C 60 Alkynyl groups, substituted C 1 -C 60 Alkoxy groups, substituted C 3 -C 10 Cycloalkyl groups, substituted C 1 -C 10 Heterocycloalkyl groups, substituted C 3 -C 10 Cycloalkenyl groups, substituted C 1 -C 10 Heterocycloalkenyl groups, substituted C 6 -C60 Aryl groups, substituted C 6 -C 60 Aryloxy groups, substituted C 6 -C 60 Arylthio groups, substituted C 1 -C 60 Heteroaryl groups, substituted monovalent non-aromatic fused polycyclic groups, substituted monovalent non-aromatic fused heteropolycyclic groups and substituted C 7 -C 12 At least one substituent of the aralkyl group may be selected from:

[0159] Deuterium, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, amidino group, hydrazine group, hydrazone group, C 1 -C 60 Alkyl group, C 2 -C 60 Alkenyl group, C 2 -C 60 Alkynyl groups and C 1 -C 60 Alkoxy groups;

[0160] Each is selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, C 3 -C 10 Cycloalkyl groups, C 1 -C 10 Heterocycloalkyl group, C 3 -C 10 Cycloalkenyl group, C 1 -C 10 Heterocycloalkenyl group, C 6 -C 60 Aryl group, C 6 -C 60 Aryloxy group, C 6 -C 60 Arylthio group, C 1 -C 60 heteroaryl group, monovalent non-aromatic fused polycyclic group, monovalent non-aromatic fused heteropolycyclic group, -Si(Q 11 )(Q 12 )(Q 13 )、-N(Q 11 )(Q 12 )、-B(Q 11 )(Q 12 )、-C(=O)(Q 11 )、-S(=O) 2 (Q 11 ) and -P(=O)(Q11 )(Q 12 ) at least one substituted C 1 -C 60 Alkyl group, C 2 -C 60 Alkenyl group, C 2 -C 60 Alkynyl groups and C 1 -C 60 Alkoxy groups;

[0161] C 3 -C 10 Cycloalkyl groups, C 1 -C 10 Heterocycloalkyl group, C 3 -C 10 Cycloalkenyl group, C 1 -C 10 Heterocycloalkenyl group, C 6 -C 60 Aryl group, C 6 -C 60 Aryloxy group, C 6 -C 60 Arylthio group, C 1 -C 60 heteroaryl groups, monovalent non-aromatic fused polycyclic groups, and monovalent non-aromatic fused heteropolycyclic groups;

[0162] Each is selected from deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, C 1 -C 60 Alkyl group, C 2 -C 60 Alkenyl group, C 2 -C 60 Alkynyl group, C 1 -C 60 Alkoxy groups, C 3 -C 10 Cycloalkyl groups, C 1 -C 10 Heterocycloalkyl group, C 3 -C 10 Cycloalkenyl group, C 1 -C 10 Heterocycloalkenyl group, C 6 -C 60 Aryl group, C 6 -C 60 Aryloxy group, C 6 -C 60 Arylthio group, C 1 -C 60heteroaryl group, monovalent non-aromatic fused polycyclic group, monovalent non-aromatic fused heteropolycyclic group, -Si(Q 21 )(Q 22 )(Q 23 )、-N(Q 21 )(Q 22 )、-B(Q 21 )(Q 22 )、-C(=O)(Q 21 )、-S(=O) 2 (Q 21 ) and -P(=O)(Q 21 )(Q 22 ) at least one substituted C 3 -C 10 Cycloalkyl groups, C 1 -C 10 Heterocycloalkyl group, C 3 -C 10 Cycloalkenyl group, C 1 -C 10 Heterocycloalkenyl group, C 6 -C 60 Aryl group, C 6 -C 60 Aryloxy group, C 6 -C 60 Arylthio group, C 1 -C 60 heteroaryl groups, monovalent non-aromatic fused polycyclic groups, and monovalent non-aromatic fused heteropolycyclic groups; and

[0163] -Si(Q 31 )(Q 32 )(Q 33 )、-N(Q 31 )(Q 32 )、-B(Q 31 )(Q 32 )、-C(=O)(Q 31 )、-S(=O) 2 (Q 31 ) and -P(=O)(Q 31 )(Q 32 ),

[0164] Where Q 11 To Q 13 , Q 21 To Q 23 and Q 31 To Q 33 can be independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazine group, a hydrazone group, a C1 -C 60 Alkyl group, C 2 -C 60 Alkenyl group, C 2 -C 60 Alkynyl group, C 1 -C 60 Alkoxy groups, C 3 -C 10 Cycloalkyl groups, C 1 -C 10 Heterocycloalkyl group, C 3 -C 10 Cycloalkenyl group, C 1 -C 10 Heterocycloalkenyl group, C 6 -C 60 Aryl group, C 1 -C 60 a heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, a biphenyl group, and a terphenyl group.

[0165] The term "Ph" as used herein refers to a phenyl group, the term "Me" as used herein refers to a methyl group, the term "Et" as used herein refers to an ethyl group, the term "tert-Bu" or "Bu" as used herein refers to an ethyl group. t ” refers to a tert-butyl group, and the term “OMe” as used herein refers to a methoxy group.

[0166] As used herein, the term "biphenyl group" refers to a "phenyl group substituted by a phenyl group". In other words, a "biphenyl group" is a 6 -C 60 Aryl groups are substituted phenyl groups as substituents.

[0167] As used herein, the term "terphenyl group" refers to a "phenyl group substituted by a biphenyl group". In other words, the "terphenyl group" is a phenyl group substituted by a C 6 -C 60 Aryl-substituted C 6 -C 60 Aryl groups are substituted phenyl groups as substituents.

[0168] Unless otherwise defined, * as used herein refers to a binding site to an adjacent atom in the corresponding formula.

[0169] The following examples are intended to specifically illustrate or describe the present disclosure, and thus do not limit the scope of the present disclosure.

[0170] [Example]

[0171] 1. Preparation of oligomeric compounds

[0172] Compound 30 of the following structure comprising unit 10 [corresponding to formula A] and unit 20 [corresponding to formula C] is prepared:

[0173]

[0174] In compound 30, R is an epoxy group, a is an integer from 700 to 900, and c is an integer from 30 to 200.

[0175] 2. Preparation of a composition for forming a planarization layer

[0176] Compositions for forming a planarization layer were prepared in the mixture ratios shown in Table 1 below.

[0177] [Table 1]

[0178]

[0179]

[0180] Silicone resin 1: poly(methylphenyl)siloxane

[0181] Siloxane resin 2: poly(phenylvinyl)-co-(methylvinyl)silsesquioxane

[0182] Silicone resin 3: PDV-1635 (Glaster)

[0183] Crosslinking resin 1: Phenyl hydrogen silsesquioxane

[0184] Crosslinking resin 2: dimethylsilyl phenyl ether

[0185] Oligomeric compound: Compound 30

[0186] Silane coupling agent: methacrylate-based cyclosiloxane

[0187] Free Radical Scavengers:

[0188]

[0189] 3. Measurement of retention rate

[0190] The wafer was coated with the composition of Example 1, subjected to a vacuum process and cured, thereby completing the preparation of the planarization layer.

[0191] Each process was weighed and the difference between processes was calculated to obtain the retention value.

[0192] Here, the coating process was performed under the conditions of 1,500 rpm / 20 s and 2,000 rpm / 20 s, the vacuum process was performed at -0.1 MPa for 3 minutes, and the curing process was performed at 180° C. for 20 minutes.

[0193] The retention rate after the vacuum process and the curing process is shown in Figure 2 middle.

[0194] refer to Figure 2 , it was confirmed that under the coating conditions of 1,500rpm / 20s and 2,000rpm / 20s, the retention rate was greater than 99%.

[0195] 4. Measurement of degree of planarization (DOP)

[0196] Measurement method

[0197] Figure 3 is a diagram schematically showing a method of measuring DOP.

[0198] The substrate with the micro-LED placed thereon was coated with the composition of Example 2 and b was measured.

[0199] The composition can sink to b, but larger b values ​​refer to less planarization. In this regard, a b value of 0 refers to 100% planarization.

[0200] The DOP value is calculated according to the following equation:

[0201] DOP=(ab) / a*100

[0202] When the substrate on which the micro-LED was placed was coated with the composition of Example 2 to a thickness of 3 μm, the a value and b value were measured and the curve is shown in Figure 4 middle.

[0203] refer to Figure 4 , the a value was 1.14 μm, and the b value was 0.02 μm, resulting in a DOP of 97.6%.

[0204] The DOP values ​​calculated based on the measured values ​​for the cases where the composition of Example 2 was applied to thicknesses of 3 μm, 5 μm, and 7 μm, respectively, are shown in FIG. Figure 5 middle.

[0205] refer to Figure 5 , confirming that all cases showed high DOP.

[0206] 5. Preparation of Micro-light Emitting Device

[0207] The micro light emitting device is prepared by growing and separating LEDs according to a chemical vapor deposition (CVD) method.

[0208] 6. Evaluation of high light resistance and high heat resistance

[0209] After forming the first electrode on the substrate, the micro light emitting device was aligned in a single transfer manner, and the composition of Example 3 was overcoated thereon to a thickness of 10 μm.

[0210] After standing at -0.1 MPa for 3 minutes, the resulting substrate was cured at 180°C for 20 minutes.

[0211] A second electrode is formed thereon to form a capping layer.

[0212] Evaluation Method

[0213] With respect to the light-emitting device (3,000 nit, 60° C.) thus prepared, changes in light characteristics (transmittance, yellow index) observed for 1,000 hours were recorded, and the results are shown in Table 2 below.

[0214] [Table 2]

[0215] Δx Δy ΔLv 24 hours 0.004 0.005 99.97％ 192 hours 0.004 0.006 101.05％ 528 hours 0.004 0.006 101.65％ 864 hours 0.004 0.005 101.29％ 1000 hours 0.004 0.005 101.29％

[0216] The results are also shown in Figure 6 .

[0217] refer to Figure 6 , confirming that the changes in color coordinates and brightness were not significant until 1000 hours.

[0218] According to one or more embodiments, a light emitting device includes a planarization layer having high light resistance, high heat resistance, and a high planarization degree, thereby showing excellent results.

[0219] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for limiting purposes. The description of features or aspects within each embodiment should generally be considered applicable to other similar features or aspects in other embodiments. Although one or more than one embodiment has been described with reference to the accompanying drawings, it should be understood by those of ordinary skill in the art that various changes in form and details may be made herein without departing from the spirit and scope defined by the claims.

Claims

1. A light-emitting device, comprising: a first electrode; a second electrode facing the first electrode; A micro light emitting device disposed between the first electrode and the second electrode; as well as A planarization layer is provided between the first electrode and the second electrode, wherein The micro-light emitting device is a nano-LED having a nanometer unit size or a micro-LED having a micrometer unit size, and The planarizing layer is prepared by curing a composition including an oligomeric compound including a group represented by Formula A and a group represented by Formula C: <Formula A> <Formula C> Wherein in Formula A and Formula C, X is R 12 or [(SiO 3 / 2 R) 4+2n O], R, R1, R2, R7 to R 12 are each independently hydrogen, deuterium, halogen, amine group, epoxy group, cyclohexyl epoxy group, acryloyl group, methacryloyl group, thiol group, isocyanate group, nitrile group, nitro group, substituted or unsubstituted C1-C 60 Alkyl group, substituted or unsubstituted C2-C 60 Alkenyl group, substituted or unsubstituted C1-C 60 Alkoxy groups, substituted or unsubstituted C3-C 10 Cycloalkyl groups, substituted or unsubstituted C1-C 10 Heterocycloalkyl group, substituted or unsubstituted C6-C 60 Aryl group, substituted or unsubstituted C1-C 60 Heteroaryl group, substituted or unsubstituted C7-C 12 Arylalkyl group, substituted or unsubstituted C6-C 60 Aryloxy group, or substituted or unsubstituted C6-C 60 Arylthio group, n is an integer from 1 to 20, and * indicates the binding site with the adjacent atom, wherein the composition comprises 1 wt % to 20 wt % of the oligomeric compound, 30 wt % to 85 wt % of a siloxane resin, 5 wt % to 50 wt % of a crosslinking resin, and 0.05 wt % to 10 wt % of a silane coupling agent, The composition also contains 2,000 ppm to 3,000 ppm of compound 300 as a free radical scavenger: The substituents used for substitution are selected from: Deuterium, -F, -Cl, -Br, -I, hydroxyl group, cyano group, nitro group, amidino group, hydrazine group, hydrazone group, C1-C 60 Alkyl groups, C2-C 60 Alkenyl groups, C2-C 60 Alkynyl groups and C1-C 60 Alkoxy groups; and C3-C 10 Cycloalkyl groups, C1-C 10 Heterocycloalkyl groups, C3-C 10 Cycloalkenyl groups, C1-C 10 Heterocycloalkenyl group, C6-C 60 Aryl group, C6-C 60 Aryloxy groups, C6-C 60 Arylthio group, C1-C 60 Heteroaryl groups, monovalent non-aromatic fused polycyclic groups and monovalent non-aromatic fused heteropolycyclic groups.

2. The light-emitting device according to claim 1, wherein the oligomeric compound is represented by the following formula 1: <Formula 1> In formula 1, A is a group represented by the formula A, C is a group represented by the formula C, R 21 To R 24 are each independently the same as defined for R1 in formula A, a is an integer from 3 to 1,000, and c is an integer from 1 to 500.

3. The light-emitting device according to claim 1, wherein the oligomeric compound is represented by the following Formula 2: <Formula 2> In Formula 2, A is a group represented by the formula A, C is a group represented by the formula C, R 25 To R 28 are each independently the same as defined for R1 in formula A, a is an integer from 3 to 1,000, and c and c' are each independently an integer from 1 to 500.

4. The light-emitting device of claim 1, wherein the oligomeric compound further comprises a group represented by formula B: <Formula B> In formula B, R3 to R6 are each independently hydrogen, deuterium, halogen, amine group, epoxy group, cyclohexyl epoxy group, acryloyl group, methacryloyl group, thiol group, isocyanate group, nitrile group, nitro group, substituted or unsubstituted C1-C 60 Alkyl group, substituted or unsubstituted C2-C 60 Alkenyl group, substituted or unsubstituted C1-C 60 Alkoxy groups, substituted or unsubstituted C3-C 10 Cycloalkyl groups, substituted or unsubstituted C1-C 10 Heterocycloalkyl group, substituted or unsubstituted C6-C 60 Aryl group, substituted or unsubstituted C1-C 60 Heteroaryl group, substituted or unsubstituted C7-C 12 Arylalkyl group, substituted or unsubstituted C6-C 60 Aryloxy group, or substituted or unsubstituted C6-C 60 Arylthio group, n is an integer from 1 to 20, and * indicates the binding site with the adjacent atom, The substituents used for substitution are as defined in claim 1.

5. The light-emitting device according to claim 4, wherein the oligomeric compound is represented by the following formula 3: <Formula 3> In Formula 3, A is a group represented by the formula A, B is a group represented by the formula B, C is a group represented by the formula C, R 29 and R 30 are each independently the same as defined for R1 in formula A, X' is independently the same as defined for X in formula C, a is an integer from 3 to 1,000, b is an integer from 1 to 500, and c is an integer from 1 to 500.

6. The light-emitting device according to claim 4, wherein the oligomeric compound is represented by the following formula 4: <Formula 4> In formula 4, A is a group represented by the formula A, B is a group represented by the formula B, C is a group represented by the formula C, R 31 To R 34 are each independently the same as defined for R1 in formula A, a is an integer from 3 to 1,000, b is an integer from 1 to 500, and c and c' are each independently an integer of 1 to 500.

7. The light-emitting device according to claim 4, wherein the oligomeric compound is represented by the following Formula 5: <Formula 5> In Formula 5, A is a group represented by the formula A, B is a group represented by the formula B, C is a group represented by the formula C, R 35 To R 38 are each independently the same as defined for R1 in formula A, a and a' are each independently an integer from 3 to 1,000, b is an integer from 1 to 500, and c is an integer from 1 to 500.

8. The light-emitting device according to claim 4, wherein the oligomeric compound is represented by the following Formula 6: <Formula 6> In Formula 6, A is a group represented by the formula A, B is a group represented by the formula B, C is a group represented by the formula C, R 39 To R 42 are each independently the same as defined for R1 in formula A, a and a' are each independently an integer from 3 to 1,000, b is an integer from 1 to 500, and c and c' are each independently an integer of 1 to 500.

9. The light-emitting device according to claim 4, wherein the oligomeric compound is represented by the following Formula 7: <Formula 7> In Formula 7, A is a group represented by the formula A, B is a group represented by the formula B, C is a group represented by the formula C, R 43 To R 46 are each independently the same as defined for R1 in formula A, a and a' are each independently an integer from 3 to 1,000, b and b' are each independently an integer from 1 to 500, and c is an integer from 1 to 500.

10. The light emitting device of claim 1, wherein the composition further comprises polymethylvinylsiloxane, poly(methylphenyl)siloxane, poly(phenylvinyl)-co-(methylvinyl)silsesquioxane, PDV-1635, PMV-9925, PVV-3522, or any combination thereof. The light emitting device of claim 1 , wherein the composition does not contain a solvent.

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