Light emitting element and display device including the same

Abstract

Embodiments provide a light emitting element and a display device including the same. The light emitting element includes a first electrode, a first light emitting unit disposed on the first electrode and including a first emission layer, a charge generating unit disposed on the first light emitting unit, a second light emitting unit disposed on the charge generating unit and including a second emission layer, a second electrode disposed on the second light emitting unit, a first capping layer disposed on the second electrode; and a second capping layer disposed on the first capping layer. The first capping layer includes a first compound represented by Formula 1, and the second capping layer includes a second compound represented by Formula 2-1 or Formula 2-2. Formula 1, Formula 2-1, and Formula 2-2 are interpreted in the description: [Formula 1] # imgabs0 # imgabs1 #

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0110164 filed in the Korean Intellectual Property Office on August 22, 2023, and Korean Patent Application No. 10-2024-0111499 filed in the Korean Intellectual Property Office on August 20, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure herein relates to a light emitting element and a display device including the light emitting element. Background Art

[0004] An organic light emitting element is a self-luminous element having a fast response time and a low driving voltage. Accordingly, an organic light emitting display device including an organic light emitting element may not include a separate light source and thus may be thin and lightweight. An organic light emitting display device has many advantages, such as excellent brightness and viewing angle independence.

[0005] The organic light emitting element is a display element including an emission layer made of an organic material between an anode and a cathode. After holes provided from the anode and electrons provided from the cathode are recombined in the emission layer to form excitons, light corresponding to the energy between holes and electrons is generated from the excitons.

[0006] The tandem organic light emitting element may have a structure of two or more stacks including a hole injection layer / emission layer / electron transport layer between an anode and a cathode. A charge generation layer that facilitates charge generation and transport may exist between each stack.

[0007] It should be understood that the background technology section is intended to provide a useful background for understanding the technology. However, the background technology section may also include ideas, concepts or cognitions of parts that were not known or understood by a person skilled in the relevant art before the corresponding effective filing date of the subject matter disclosed in this article. Summary of the invention

[0008] The present disclosure provides a light emitting element in which light emitting efficiency and element life are improved.

[0009] The present disclosure also provides a display device including a light emitting element in which light emitting efficiency and element life are improved, thereby having excellent display quality.

[0010] According to an embodiment, the light emitting element may include a first electrode, a first light emitting unit disposed on the first electrode and including a first emission layer, a charge generating unit disposed on the first light emitting unit, a second light emitting unit disposed on the charge generating unit and including a second emission layer, a second electrode disposed on the second light emitting unit, a first capping layer disposed on the second electrode, and a second capping layer disposed on the first capping layer, wherein:

[0011] The first capping layer may include a first compound represented by Formula 1, and the second capping layer may include a second compound represented by Formula 2-1 or Formula 2-2:

[0012] [Formula 1]

[0013]

[0014] In formula 1, L 1 To L 3 may each independently be a directly linked, substituted or unsubstituted arylene group having 6 to 12 ring carbon atoms or a substituted or unsubstituted heteroarylene group having 5 to 11 ring carbon atoms,

[0015] X can be O or S,

[0016] Y can be N or C (R y ),and

[0017] R 1 , R 2 , R x and R y may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms; and n may be an integer selected from 0 to 4;

[0018] [Formula 2-1]

[0019]

[0020] In formula 2-1, R a1 To R a6each independently may be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may bond with an adjacent group to form a ring;

[0021] [Formula 2-2]

[0022]

[0023] In formula 2-2, A 1 and A 2 can be N or C (R z ),and

[0024] R z and R b1 To R b6 Each may independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or may bond with an adjacent group to form a ring.

[0025] In an embodiment, the first capping layer may have a refractive index in the range of about 2.2 to about 6.0 relative to visible light having a wavelength of about 450 nm; and the second capping layer may have a refractive index in the range of about 1.0 to about 2.0 relative to visible light having a wavelength of about 450 nm.

[0026] In an embodiment, in Formula 1, R 1 and R 2 Each of them may independently be a substituted or unsubstituted amino group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted benzoxazolyl group, a substituted or unsubstituted benzothiazolyl group, a substituted or unsubstituted benzofuranyl group or a substituted or unsubstituted benzothiophenyl group.

[0027] In an embodiment, in Formula 2-1 and Formula 2-2, R a1 To R a6 and R b1 To R b6They may each independently be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted phenyl group, or may bond with an adjacent group to form a ring.

[0028] In an embodiment, the first compound may be represented by any one of Formula 1-1 to Formula 1-3:

[0029] [Formula 1-1]

[0030]

[0031] [Formula 1-2]

[0032]

[0033] [Formula 1-3]

[0034]

[0035] In Formula 1-1 to Formula 1-3, R 11 To R 16 R may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may bond with an adjacent group to form a ring; x1 and R x2 X may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms; 1 and X 2 Each independently is O or S; Y 1 and Y 2 Each independently is N or C(R y ), n1 and n2 may each independently be an integer selected from 0 to 4; m1 to m6 may each independently be an integer selected from 0 to 5; and X, Y, R x , R y and n are the same as defined in Formula 1.

[0036] In an embodiment, the first compound may include at least one compound selected from Compound Group 1 explained below.

[0037] In an embodiment, the second compound may include at least one compound selected from Compound Group 2 explained below.

[0038] In an embodiment, the refractive index of the first capping layer with respect to visible light may be higher than the refractive index of the second capping layer with respect to visible light.

[0039] In an embodiment, a thickness of the first capping layer may be greater than a thickness of the second capping layer.

[0040] In an embodiment, a sum of a thickness of the first capping layer and a thickness of the second capping layer may be in a range of about 100 nm to about 300 nm.

[0041] In an embodiment, the first capping layer may have a thickness in the range of about 50 nm to about 80 nm; and the second capping layer may have a thickness in the range of about 30 nm to 60 nm.

[0042] In an embodiment, the first emission layer may include a first red emission layer emitting red light, a first green emission layer emitting green light, and a first blue emission layer emitting blue light; and the first red emission layer, the first green emission layer, and the first blue emission layer may be spaced apart from each other in a plan view.

[0043] In an embodiment, the second emission layer may include a second red emission layer corresponding to the first red emission layer and emitting red light, a second green emission layer corresponding to the first green emission layer and emitting green light, and a second blue emission layer corresponding to the first blue emission layer and emitting blue light.

[0044] In an embodiment, the first light emitting unit may further include a first hole transport region disposed on a lower portion of the first emission layer and a first electron transport region disposed on an upper portion of the first emission layer; and the second light emitting unit may further include a second electron transport region disposed on an upper portion of the second emission layer.

[0045] According to an embodiment, a display device may include a base layer, a circuit layer disposed on the base layer, and a display element layer disposed on the circuit layer and including a light emitting element, wherein:

[0046] The light-emitting element may include a first electrode, a first light-emitting unit disposed on the first electrode and including a first emission layer, a charge generating unit disposed on the first light-emitting unit, a second light-emitting unit disposed on the charge generating unit and including a second emission layer, a second electrode disposed on the second light-emitting unit, a first capping layer disposed on the second electrode, and a second capping layer disposed on the first capping layer; the first capping layer may include a first compound represented by Formula 1; and the second capping layer may include a second compound represented by Formula 2-1 or Formula 2-2.

[0047] [Formula 1]

[0048]

[0049] In formula 1, L 1 To L 3 may be each independently a directly linked, substituted or unsubstituted arylene group having 6 to 12 ring carbon atoms or a substituted or unsubstituted heteroarylene group having 5 to 11 ring carbon atoms; X may be O or S; Y may be N or C(R y );R 1 , R 2 , R x and R y Each may independently be a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms; and n may be an integer selected from 0 to 4.

[0050] [Formula 2-1]

[0051]

[0052] In formula 2-1, R a1 To R a6 Each may independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or may bond with an adjacent group to form a ring.

[0053] [Formula 2-2]

[0054]

[0055] In formula 2-2, A 1 and A 2 can be N or C (R z ); and R z and R b1 To R b6Each may independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or may bond with an adjacent group to form a ring.

[0056] In an embodiment, the base layer may include a first light-emitting region, a second light-emitting region, and a third light-emitting region spaced apart from each other in a plan view, and a non-light-emitting region defined between the first light-emitting region, the second light-emitting region, and the third light-emitting region; the display element layer may include a pixel defining film overlapping the non-light-emitting region, and an opening overlapping each of the first light-emitting region, the second light-emitting region, and the third light-emitting region; and the first emission layer may be disposed in each opening.

[0057] In an embodiment, the first emission layer may include a first red emission layer corresponding to the first light-emitting area, a first green emission layer corresponding to the second light-emitting area, and a first blue emission layer corresponding to the third light-emitting area; the second emission layer may include a second red emission layer corresponding to the first light-emitting area, a second green emission layer corresponding to the second light-emitting area, and a second blue emission layer corresponding to the third light-emitting area.

[0058] In an embodiment, the first light-emitting unit may further include a first hole transport region disposed on a lower portion of the first emission layer and a first electron transport region disposed on an upper portion of the first emission layer; and for the first light-emitting region, the second light-emitting region, and the third light-emitting region, the first hole transport region and the first electron transport region may each be provided as a common layer.

[0059] In an embodiment, the second light emitting unit may further include a second electron transport region disposed on an upper portion of the second emission layer; and the second electron transport region may be provided as a common layer for the first light emitting region, the second light emitting region, and the third light emitting region.

[0060] In an embodiment, the charge generation unit, the second electrode, the first capping layer, and the second capping layer may each be provided as a common layer for the first light emitting region, the second light emitting region, and the third light emitting region.

[0061] It should be understood that the above embodiments have been described in a general and explanatory sense only and not for purposes of limitation, and the present disclosure is not limited to the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The attached drawings are included to provide a further understanding of the embodiments, and are incorporated into and constitute a part of this specification. The drawings illustrate the embodiments of the present disclosure and its principles. The above and other aspects and features of the present disclosure will become more apparent by describing the embodiments of the present disclosure in detail with reference to the attached drawings, in which:

[0063] Figure 1 is a schematic plan view of a display device according to an embodiment;

[0064] Figure 2 is a schematic cross-sectional view of a display device according to an embodiment;

[0065] FIG. 3A to FIG. 3D Each is a schematic cross-sectional view of a light emitting element according to an embodiment;

[0066] Figure 4 is a schematic cross-sectional view of a light emitting element according to an embodiment; and

[0067] Figure 5 is a schematic perspective view of a vehicle in which a display device is provided according to an embodiment. DETAILED DESCRIPTION

[0068] The present disclosure will now be described more fully below with reference to the attached drawings in which embodiments are shown. However, the present disclosure may be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art.

[0069] In the drawings, the size (eg, thickness), ratio, and dimensions of elements may be exaggerated for ease of description and for clarity. Like reference numerals and reference characters refer to like elements throughout.

[0070] In the specification, it will be understood that when an element (or region, layer, component, etc.) is referred to as being "on", "connected to" or "coupled to" another element (or region, layer, component, etc.), it may be directly on, directly connected to or directly coupled to the other element (or region, layer, component, etc.), or one or more intervening elements (or regions, layers, components, etc.) may be present therebetween. In a similar sense, when an element (or region, layer, component, etc.) is described as "covering" another element (or region, layer, component, etc.), it may directly cover the other element (or region, layer, component, etc.), or one or more intervening elements (or regions, layers, components, etc.) may be present therebetween.

[0071] In the specification, when an element is "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements. For example, "directly on" may mean that two layers or two elements are disposed without another element (e.g., an adhesive element) between them.

[0072] As used herein, expressions used in the singular such as “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0073] As used herein, the term "and / or" includes any and all combinations of one or more 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 a connecting sense or a separating sense and may be understood to be equivalent to "and / or".

[0074] In the specification and claims, for the purposes of its meaning and interpretation, the term "at least one of" is intended to include the meaning of "at least one selected from the group consisting of..." For example, "at least one of A, B, and C" may be understood to mean only A, only B, only C, or any combination of two or more of A, B, and C, such as ABC, ACC, BC, or CC. When following a list of elements, the term "at least one of" modifies the entire list of elements and does not modify the individual elements of the list.

[0075] It will be understood that although the terms first, second, etc. may be used to describe various elements in this article, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, without departing from the teachings of the present disclosure, the first element may be referred to as the second element. Similarly, without departing from the scope of the present disclosure, the second element may be referred to as the first element.

[0076] For ease of description, spatially relative terms such as "below," "under," "down," "above," or "on" may be used herein to describe the relationship between one element or component and another element or component as illustrated in the accompanying drawings. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, in the case where the device illustrated in the accompanying drawings is turned over, a device that is "below" or "below" another device may be placed "above" the other device. Accordingly, the illustrative term "below" may include both a lower position and an upper position. The device may also be oriented in other directions, and therefore the spatially relative terms may be interpreted differently depending on the orientation.

[0077] As used herein, the term "about" or "approximately" includes the stated value and means within an acceptable range of deviation of the stated value determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the stated quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±20%, ±10%, or ±5% of the stated value.

[0078] It should be understood that the terms “comprises,” “comprising,” “includes,” “including,” “have,” “having,” “contains,” and “containing” and the like are intended to indicate the presence of the recited features, integers, steps, operations, elements, components, or any combination thereof in the present disclosure, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or any combination thereof.

[0079] Unless otherwise defined or implied herein, all terms (including technical terms and scientific terms) used have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. It will be further understood that 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 art and should not be interpreted in an ideal or overly formal sense unless clearly defined in the specification.

[0080] In the specification, the term "substituted or unsubstituted" may describe a group that is unsubstituted or substituted by at least one substituent selected from the group consisting of: a deuterium atom, a halogen atom, a cyano group, a nitro group, an amine group, a silyl group, an oxy group, a sulfenyl group, a sulfonyl group, a carbonyl group, a boron group, a phosphine oxide group, a phosphine sulfide group, an alkyl group, an alkenyl group, an alkynyl group, a hydrocarbon ring group, a heterocyclic group, an aryl group, and a heteroaryl group. Each of the substituents listed above may itself be substituted or unsubstituted. For example, a biphenyl group may be interpreted as an aryl group, or it may be interpreted as a phenyl group substituted by a phenyl group.

[0081] In the specification, the term "bonded to an adjacent group to form a ring" may be interpreted as a group bonded to an adjacent group to form a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocyclic ring. The hydrocarbon ring may be aliphatic or aromatic. The heterocyclic ring may be aliphatic or aromatic. The hydrocarbon ring and the heterocyclic ring may each independently be monocyclic or polycyclic. The ring formed by bonding adjacent groups to each other may itself be connected to another ring to form a spiro structure.

[0082] In the specification, the term "adjacent group" may be interpreted as a substituent substituted at an atom directly connected to an atom substituted by a corresponding substituent, as another substituent substituted at an atom substituted by a corresponding substituent, or as a substituent located at a position closest to the corresponding substituent in space. For example, two methyl groups in 1,2-dimethylbenzene may be interpreted as "adjacent groups" to each other, and two ethyl groups in 1,1-diethylcyclopentane may be interpreted as "adjacent groups" to each other. For example, two methyl groups in 4,5-dimethylphenanthrene may be interpreted as "adjacent groups" to each other.

[0083] In the specification, examples of the halogen atom may include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

[0084] In the specification, the alkyl group may be linear or branched. The number of carbon atoms in the alkyl group may be 1 to 50, 1 to 30, 1 to 20, 1 to 10, or 1 to 6. Examples of the alkyl group may include methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, isobutyl, 2-ethylbutyl, 3,3-dimethylbutyl, n-pentyl, isopentyl, neopentyl, tert-pentyl, 1-methylpentyl, 3-methylpentyl, 2-ethylpentyl, 4-methyl-2-pentyl, n-hexyl, 1-methylhexyl, 2-ethylhexyl, 2-butylhexyl, n-heptyl, 1-methylheptyl, 2,2-dimethylheptyl, 2-ethylheptyl, 2-butylheptyl, n-octyl, tert-octyl, 2-ethyloctyl, 2-butyloctyl, 2-hexyloctyl, 3,7-dimethyloctyl, n-nonyl, n-decyl, adamantyl, 2-ethyldecyl, 2-butyldecyl, 2-hexyldecyl, 2-octyldecyl, n-undecyl, alkyl, n-dodecyl, 2-ethyldodecyl, 2-butyldodecyl, 2-hexyldodecyl, 2-octyldodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, 2-ethylhexadecyl, 2-butylhexadecyl, 2-hexylhexadecyl, 2-octylhexadecyl, n-heptadecyl, n-octadecyl, n-nonadecyl, n-eicosyl, 2-ethyleicosyl, 2-butyleicosyl, 2-hexyleicosyl, 2-octyleicosyl, n-heonicosyl, n-docosyl, n-tricosyl, n-tetracosyl, n-pentacosyl, n-hexacosyl, n-heptacosyl, n-octacosyl, n-nonacosyl, n-triacontyl, and the like, but the embodiment is not limited thereto.

[0085] In the specification, the cycloalkyl group may be a cyclic alkyl group. The number of carbon atoms in the cycloalkyl group may be 3 to 50, 3 to 30, 3 to 20, or 3 to 10. Examples of the cycloalkyl group may include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-tert-butylcyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, norbornyl, 1-adamantyl, 2-adamantyl, isobornyl, bicycloheptyl, etc., but the embodiment is not limited thereto.

[0086] In the specification, the alkenyl group may be a hydrocarbon group including at least one carbon-carbon double bond in the middle or at the end of an alkyl group having 2 or more carbon atoms. The alkenyl group may be linear or branched. The number of carbon atoms in the alkenyl group is not specifically limited, and may be 2 to 30, 2 to 20, or 2 to 10. Examples of alkenyl groups may include vinyl, 1-butenyl, 1-pentenyl, 1,3-butadienyl, styryl, styrylvinyl, etc., but embodiments are not limited thereto.

[0087] In the specification, the alkynyl group may be a hydrocarbon group including at least one carbon-carbon triple bond in the middle or at the end of an alkyl group having 2 or more carbon atoms. The alkynyl group may be linear or branched. The number of carbon atoms in the alkynyl group is not particularly limited, and may be 2 to 30, 2 to 20, or 2 to 10. Examples of the alkynyl group may include ethynyl, propynyl, etc., but embodiments are not limited thereto.

[0088] In the specification, the hydrocarbon ring group may be any functional group or substituent derived from an aliphatic hydrocarbon ring. For example, the hydrocarbon ring group may be a saturated hydrocarbon ring group having 5 to 20 ring-forming carbon atoms.

[0089] In the specification, the aryl group may be any functional group or substituent derived from an aromatic hydrocarbon ring. The aryl group may be monocyclic or polycyclic. The number of ring carbon atoms in the aryl group may be 6 to 30, 6 to 20, or 6 to 15. Examples of aryl groups may include phenyl, naphthyl, fluorenyl, anthracenyl, phenanthrenyl, biphenyl, terphenyl, quaterphenyl, pentaphenyl, hexaphenyl, triphenylene, pyrenyl, benzofluoranthenyl, 1,2-triphenylenyl, etc., but embodiments are not limited thereto.

[0090] In the specification, the fluorenyl group may be substituted, and two substituents may be bonded to each other to form a spiro structure. Examples of the substituted fluorenyl group may include the groups shown below. However, the embodiment is not limited thereto.

[0091]

[0092] In the specification, the heterocyclic group may be any functional group or substituent derived from a ring including at least one of B, O, N, P, Si, S and Se as a heteroatom. The heterocyclic group may be aliphatic or aromatic. The aromatic heterocyclic group may be a heteroaryl. The aliphatic heterocyclic group and the aromatic heterocyclic group may each independently be monocyclic or polycyclic.

[0093] If the heterocyclic group contains two or more heteroatoms, the two or more heteroatoms may be the same as or different from each other. The number of ring-forming carbon atoms in the heterocyclic group may be 2 to 30, 2 to 20, or 2 to 10.

[0094] Examples of the aliphatic heterocyclic group may include an oxiranyl group, a thiirane group, a pyrrolidinyl group, a piperidinyl group, a tetrahydrofuranyl group, a tetrahydrothiophenyl group, a thianyl group, a tetrahydropyranyl group, a 1,4-dioxanyl group, and the like, but the embodiment is not limited thereto.

[0095] Examples of heteroaryl groups may include thienyl, furanyl, pyrrolyl, imidazolyl, pyridyl, bipyridyl, pyrimidyl, triazinyl, triazolyl, acridinyl, pyridazinyl, pyrazinyl, quinolyl, quinazolinyl, quinoxalinyl, phenoxazinyl, phthalazinyl, pyridopyrimidinyl, pyridopyrazinyl, pyrazinopyrazinyl, isoquinolyl, indolyl, carbazolyl, N-arylcarbazolyl, N-heteroarylcarbazolyl, The invention also includes but is not limited to benzophenone, benzothiophene, dibenzothiophene, thienothiphenyl, benzofuranyl, phenanthroline, thiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, thiadiazolyl, phenothiazinyl, dibenzothiole, dibenzofuranyl, xanthenyl, indolocarbazolyl and the like, but the embodiment is not limited thereto.

[0096] In the specification, the above description of the aryl group can be applied to the arylene group, except that the arylene group is a divalent group. In the specification, the above description of the heteroaryl group can be applied to the heteroarylene group, except that the heteroarylene group is a divalent group.

[0097] In the specification, the silyl group may be an alkylsilyl group or an arylsilyl group. The alkyl group in the alkylsilyl group may be linear, branched or cyclic. The number of carbon atoms in the alkylsilyl group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms in the arylsilyl group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of silyl groups may include trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl, vinyldimethylsilyl, propyldimethylsilyl, triphenylsilyl, diphenylsilyl, phenylsilyl, etc., but embodiments are not limited thereto.

[0098] In the specification, the number of carbon atoms in the carbonyl group is not particularly limited, and may be 1 to 40, 1 to 30, or 1 to 20. For example, the carbonyl group may have one of the following structures, but the embodiment is not limited thereto.

[0099]

[0100] In the specification, the number of carbon atoms in the sulfinyl group or the sulfonyl group is not particularly limited, and may be 1 to 30. The sulfinyl group may be an alkylsulfinyl group or an arylsulfinyl group. The sulfonyl group may be an alkylsulfonyl group or an arylsulfonyl group.

[0101] In the specification, the thio group may be an alkylthio group or an arylthio group. The thio group may be a sulfur atom bonded to an alkyl group or an aryl group as defined above. The alkyl group in the alkylthio group may be linear, branched or cyclic. The number of carbon atoms in the alkylthio group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms in the arylthio group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of thio groups may include methylthio, ethylthio, propylthio, pentylthio, hexylthio, octylthio, dodecylthio, cyclopentylthio, cyclohexylthio, phenylthio, naphthylthio, etc., but embodiments are not limited thereto.

[0102] In the specification, the oxy group may be an oxygen atom bonded to an alkyl or aryl group as defined above. The oxy group may be an alkoxy group or an aryloxy group. The alkoxy group may be linear, branched or cyclic. The number of carbon atoms in the alkoxy group is not specifically limited, and may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms in the aryloxy group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of oxy groups may include methoxy, ethoxy, n-propoxy, isopropoxy, butoxy, pentyloxy, hexyloxy, octyloxy, nonyloxy, decyloxy, benzyloxy, etc., but embodiments are not limited thereto.

[0103] In the specification, the boryl group may be a boron atom bonded to an alkyl group or an aryl group as defined above. The boryl group may be an alkyl boryl group or an aryl boryl group. The alkyl group in the alkyl boryl group may be linear, branched or cyclic. The number of carbon atoms in the alkyl boryl group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms in the aryl boryl group is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of boryl groups may include dimethyl boryl, diethyl boryl, tert-butyl methyl boryl, diphenyl boryl, phenyl boryl, etc., but embodiments are not limited thereto.

[0104] In the specification, the number of carbon atoms in the amine group is not specifically limited, and may be 1 to 30. The amine group may be an alkylamine group or an arylamine group. The alkyl group in the alkylamine group may be linear, branched, or cyclic. The number of carbon atoms in the alkylamine group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The number of carbon atoms in the arylamine group is not specifically limited, but may be, for example, 6 to 30, 6 to 20, or 6 to 15. Examples of the amine group may include a methylamine group, a dimethylamine group, a phenylamine group, a diphenylamine group, a naphthylamine group, a 9-methyl-anthrylamine group, and the like, but the embodiment is not limited thereto.

[0105] In the specification, the sulfinyl group may mean an alkyl group or an aryl group defined above combined with -S(=O)-. The number of carbon atoms of the sulfinyl group is not particularly limited, but may be 1 to 30, 1 to 20, or 1 to 10. The sulfinyl group may include an alkylsulfinyl group and an arylsulfinyl group. For example, the sulfinyl group may have the following structure, but is not limited thereto.

[0106]

[0107] In the specification, sulfonyl may refer to -S(=O) 2 - combined with the above-defined alkyl or aryl groups. The number of carbon atoms of the sulfonyl group is not particularly limited, but may be 1 to 30, 1 to 20, or 1 to 10. The sulfonyl group may include an alkylsulfonyl group and an arylsulfonyl group. For example, the sulfonyl group may have the following structure, but is not limited thereto.

[0108]

[0109] In the specification, the phosphine oxide group may mean an alkyl group or an aryl group defined above combined with -P(=O)-. The number of carbon atoms of the phosphine oxide group is not particularly limited, but may be 1 to 30, 1 to 20, or 1 to 10. The phosphine oxide group may include an alkyl phosphine oxide group and an aryl phosphine oxide group. For example, the phosphine oxide group may have the following structure, but is not limited thereto.

[0110]

[0111] In the specification, the phosphinosulfide group may mean an alkyl or aryl group defined above in combination with -P(=S)-. The number of carbon atoms of the phosphinosulfide group is not particularly limited, but may be 1 to 30, 1 to 20, or 1 to 10. The phosphinosulfide group may include an alkylphosphinosulfide group and an arylphosphinosulfide group. For example, the phosphinosulfide group may have the following structure, but is not limited thereto.

[0112]

[0113] In the specification, the alkyl group in the alkoxy group, alkylthio group, alkylsulfonyl group, alkylsulfinyl group, alkylaryl group, alkylboryl group, alkylsilyl group, alkylphosphine oxide group, alkylphosphine sulfide group or alkylamine group may be the same as exemplified above for the alkyl group.

[0114] In the specification, the aryl group in the aryloxy group, arylthio group, arylsulfonyl group, arylsulfinyl group, arylboryl group, arylsilyl group, arylphosphine oxide group, arylphosphine sulfide group or arylamine group may be the same as exemplified above for the aryl group.

[0115] In the specification, a direct connection may be a single bond.

[0116] In this manual, the symbol Each represents a bond to adjacent atoms in the corresponding formula or moiety.

[0117] Hereinafter, embodiments will be described with reference to the accompanying drawings.

[0118] Figure 1 is a schematic plan view of a display device DD according to an embodiment. Figure 2 is a schematic cross-sectional view of a display device DD according to an embodiment. Figure 2 To explain along Figure 1 Schematic cross-sectional view of the portion taken along the dotted line II'.

[0119] The display device DD may include a display panel DP and an optical layer PL disposed on the display panel DP. The display panel DP includes light emitting elements ED-1, ED-2, and ED-3. The display device DD may include a plurality of the respective light emitting elements ED-1, ED-2, and ED-3. The optical layer PL may be disposed on the display panel DP to control light reflected at the display panel DP by external light. The optical layer PL may include, for example, a polarizing layer or a color filter layer. Although not shown in the drawings, in an embodiment, the optical layer PL may be omitted from the display device DD.

[0120] The base substrate BL may be disposed on the optical layer PL. The base substrate BL may provide a base surface on which the optical layer PL is disposed. The base substrate BL may be a glass substrate, a metal substrate, a plastic substrate, or the like. However, the embodiment is not limited thereto, and the base substrate BL may include an inorganic layer, an organic layer, or a composite material layer. Although not shown in the drawings, in an embodiment, the base substrate BL may be omitted.

[0121] The display device DD according to the embodiment may further include a filling layer (not shown). The filling layer (not shown) may be provided between the display element layer DP-ED and the base substrate BL. The filling layer (not shown) may be an organic material layer. The filling layer (not shown) may include at least one of an acrylic resin, a silicone resin, and an epoxy resin.

[0122] The display panel DP may include a base layer BS, a circuit layer DP-CL provided on the base layer BS, and a display element layer DP-ED. The display element layer DP-ED may include a pixel defining film PDL, light emitting elements ED-1, ED-2, and ED-3 disposed between portions of the pixel defining film PDL, and an encapsulation layer TFE disposed on the light emitting elements ED-1, ED-2, and ED-3.

[0123] The base layer BS may provide a base surface on which the display element layer DP-ED is disposed. The base layer BS may be a glass substrate, a metal substrate, a plastic substrate, etc. However, the embodiment is not limited thereto, and the base layer BS may include an inorganic layer, an organic layer, or a composite material layer.

[0124] In an embodiment, the circuit layer DP-CL is disposed on the base layer BS, and the circuit layer DP-CL may include a plurality of transistors (not shown). The plurality of transistors (not shown) may each include a control electrode, an input electrode, and an output electrode. For example, the circuit layer DP-CL may include a switching transistor and a driving transistor for driving the light emitting elements ED-1, ED-2, and ED-3 of the display element layer DP-ED.

[0125] The light emitting elements ED-1, ED-2, and ED-3 may include a first light emitting element ED-1, a second light emitting element ED-2, and a third light emitting element ED-3. The light emitting elements ED-1, ED-2, and ED-3 may each have a FIG. 3A to FIG. 3D The structure of the light-emitting element ED of any one of the embodiments. The light-emitting elements ED-1, ED-2, and ED-3 may each include a first electrode EL1, a first light-emitting unit OL1, a charge generating unit CGL, a second light-emitting unit OL2, and a second electrode EL2. The light-emitting elements ED-1, ED-2, and ED-3 may each be a light-emitting element having a series structure. In the light-emitting elements ED-1, ED-2, and ED-3, the two light-emitting units may each emit light in the same wavelength region.

[0126] The first light emitting unit OL1 may include a first hole transport region HTR1, first emission layers EML-R1, EML-G1 and EML-B1, and a first electron transport region ETR1. The second light emitting unit OL2 may include second emission layers EML-R2, EML-G2 and EML-B2, and a second electron transport region ETR2. Figure 2 An embodiment is explained in which the first emission layers EML-R1, EML-G1 and EML-B1 and the second emission layers EML-R2, EML-G2 and EML-B2 of the light emitting elements ED-1, ED-2 and ED-3 are disposed in the openings OH defined in the pixel defining film PDL, and the first hole transport region HTR1, the first electron transport region ETR1 and the second electron transport region ETR2, the charge generation unit CGL and the second electrode EL2 are each provided as a common layer for the light emitting elements ED-1, ED-2 and ED-3. However, the embodiment is not limited thereto. Although not described in Figure 2, but in an embodiment, by patterning in the opening OH defined in the pixel defining film PDL, at least one of the first hole transport region HTR1, the first electron transport region ETR1, the second electron transport region ETR2, and the charge generation unit CGL may each be provided as a pattern layer. In the specification, the term "common layer" may be interpreted so that the component can be provided in common to all the light-emitting elements ED-1, ED-2, and ED-3 to form a substantially single configuration, and the term "pattern layer" may be interpreted so that the component can be provided by patterning in the opening OH defined in the pixel defining film PDL and spaced apart from each other. For example, in an embodiment, the first hole transport region HTR1 of the light-emitting elements ED-1, ED-2, and ED-3, the first emission layers EML-R1, EML-G1, and EML-B1, and the second emission layers EML-R2, EML-G2, and EML-B2, the charge generation unit CGL, and the first electron transport region ETR1 and the second electron transport region ETR2, etc. may be provided by inkjet printing as needed.

[0127] The encapsulation layer TFE may cover the light emitting elements ED-1, ED-2 and ED-3. The encapsulation layer TFE may seal the light emitting elements ED-1, ED-2 and ED-3 in the display element layer DP-ED. The encapsulation layer TFE may be a thin film encapsulation layer. The encapsulation layer TFE may be formed of a single layer or a plurality of layers. The encapsulation layer TFE may include at least one insulating layer. The encapsulation layer TFE according to an embodiment may include at least one inorganic film (hereinafter, encapsulation-inorganic film). In an embodiment, the encapsulation layer TFE may include at least one organic film (hereinafter, encapsulation-organic film) and at least one encapsulation-inorganic film.

[0128] The encapsulation-inorganic film protects the display element layer DP-ED from moisture and / or oxygen, and the encapsulation-organic film protects the display element layer DP-ED from foreign substances (e.g., dust particles). The encapsulation-inorganic film may include silicon nitride, silicon oxynitride, silicon oxide, titanium oxide, or aluminum oxide, etc., but the embodiment is not limited thereto. The encapsulation-organic film may include an acrylic compound or an epoxy compound, etc. The encapsulation-organic film may include a photopolymerizable organic material, but the embodiment is not limited thereto.

[0129] The encapsulation layer TFE may be disposed on the second electrode EL2 and may be disposed to fill the open holes OH.

[0130] refer to Figure 1 and Figure 2, the display device DD may include a non-light emitting area NPXA and light emitting areas PXA-R, PXA-G, and PXA-B. The light emitting areas PXA-R, PXA-G, and PXA-B may each be an area emitting light generated by the light emitting elements ED-1, ED-2, and ED-3, respectively. The light emitting areas PXA-R, PXA-G, and PXA-B may be spaced apart from each other in a plan view.

[0131] The light-emitting areas PXA-R, PXA-G, and PXA-B may be areas separated from each other by a pixel-defining film PDL. The non-light-emitting area NPXA may be an area between adjacent light-emitting areas PXA-R, PXA-G, and PXA-B and may correspond to the pixel-defining film PDL. In an embodiment, the light-emitting areas PXA-R, PXA-G, and PXA-B may each correspond to a pixel. The pixel-defining film PDL may separate the light-emitting elements ED-1, ED-2, and ED-3. The first emission layers EML-R1, EML-G1, and EML-B1 of the light-emitting elements ED-1, ED-2, and ED-3 and the second emission layers EML-R2, EML-G2, and EML-B2 may be disposed in the openings OH defined in the pixel-defining film PDL and separated from each other.

[0132] The light emitting areas PXA-R, PXA-G, and PXA-B may be arranged into a plurality of groups according to the colors of the lights generated from the light emitting elements ED-1, ED-2, and ED-3. Figure 1 and Figure 2 In the display device DD according to the embodiment explained in , three light emitting areas PXA-R, PXA-G and PXA-B emitting red light, green light and blue light respectively are explained as examples. For example, the display device DD may include a first light emitting area PXA-R as a red light emitting area PXA-R, a second light emitting area PXA-G as a green light emitting area PXA-G and a third light emitting area PXA-B as a blue light emitting area PXA-B.

[0133] In the display device DD according to the embodiment, the light emitting elements ED-1, ED-2, and ED-3 may emit light having wavelength regions different from each other. For example, in the embodiment, the display device DD may include a first light emitting element ED-1 emitting red light, a second light emitting element ED-2 emitting green light, and a third light emitting element ED-3 emitting blue light. For example, the red light emitting area PXA-R, the green light emitting area PXA-G, and the blue light emitting area PXA-B of the display device DD may correspond to the first light emitting element ED-1, the second light emitting element ED-2, and the third light emitting element ED-3, respectively.

[0134] However, the embodiment is not limited thereto, and the first to third light emitting elements ED-1, ED-2, and ED-3 may emit light in the same wavelength region, or at least one light emitting element may emit light in a wavelength region different from the remaining wavelength regions.

[0135] The light emitting areas PXA-R, PXA-G, and PXA-B in the display device DD according to the embodiment may be arranged in a stripe configuration. Figure 1 , the red light emitting area PXA-R, the green light emitting area PXA-G, and the blue light emitting area PXA-B may be arranged along the second direction axis DR2, respectively. In another embodiment, the red light emitting area PXA-R, the green light emitting area PXA-G, and the blue light emitting area PXA-B may be arranged in this order along the first direction axis DR1. The third direction axis DR3 may be perpendicular to a plane defined by the first direction axis DR1 and the second direction axis DR2.

[0136] Figure 1 and Figure 2 It is explained that the light emitting regions PXA-R, PXA-G, and PXA-B all have the same area, but the embodiment is not limited thereto. In an embodiment, the sizes or shapes of the light emitting regions PXA-R, PXA-G, and PXA-B may be different from each other according to the wavelength region of the emitted light. The areas of the light emitting regions PXA-R, PXA-G, and PXA-B may be areas in a plane view defined by the first direction axis DR1 and the second direction axis DR2.

[0137] The arrangement of the light emitting areas PXA-R, PXA-G and PXA-B is not limited to Figure 1 The configuration explained in , and the order of arranging the red light emitting areas PXA-R, the green light emitting areas PXA-G, and the blue light emitting areas PXA-B can be provided in various combinations according to the display quality characteristics required by the display device DD. For example, the light emitting areas PXA-R, PXA-G, and PXA-B can be arranged in a honeycomb configuration (e.g., ) or arranged in a diamond configuration (e.g., Diamond ).

[0138] The areas of the light emitting regions PXA-R, PXA-G, and PXA-B may be different from each other. For example, in an embodiment, the area of ​​the green light emitting region PXA-G may be smaller than the area of ​​the blue light emitting region PXA-B, but the embodiment is not limited thereto.

[0139] FIG. 3A to FIG. 3D Each is a schematic cross-sectional view of a light emitting element according to an embodiment.

[0140] refer to Figure 3AAccording to the embodiment, the light emitting element ED may include a first electrode EL1, a first light emitting unit OL1, a charge generating unit CGL, a second light emitting unit OL2, a second electrode EL2, a first capping layer CPL1 and a second capping layer CPL2. In the light emitting element ED, the first light emitting unit OL1 may include a first hole transport region HTR1, a first emission layer EML1 and a first electron transport region ETR1 stacked in sequence, and the second light emitting unit OL2 may include a second emission layer EML2 and a second electron transport region ETR2 stacked in sequence.

[0141] and Figure 3A compared to, Figure 3B 1 illustrates a schematic cross-sectional view of such a light emitting element ED, wherein the second light emitting unit OL2 further includes a second hole transport region HTR2 disposed on a lower portion of the second emission layer EML2. Figure 3B compared to, Figure 3C The schematic cross-sectional view of the light emitting element ED is illustrated, the first hole transport region HTR1 and the second hole transport region HTR2 include the first hole injection layer HIL1 and the first hole transport layer HTL1 and the second hole injection layer HIL2 and the second hole transport layer HTL2, respectively, and the first electron transport region ETR1 and the second electron transport region ETR2 include the first electron injection layer EIL1 and the first electron transport layer ETL1 and the second electron injection layer EIL2 and the second electron transport layer ETL2, respectively. Figure 3B compared to, Figure 3D A schematic cross-sectional view of such a light-emitting element ED is illustrated, wherein the first hole transport region HTR1 and the second hole transport region HTR2 respectively include a first emission auxiliary layer SE-1 (SE-R1, SE-G1 and SE-B1) and a first hole transport layer HTL1 and a second emission auxiliary layer SE-2 (SE-R2, SE-G2 and SE-B2) and a second hole transport layer HTL2.

[0142] Below, we will refer to FIG. 3A to FIG. 3D Each of the components included in the light emitting element ED is described.

[0143] The first electrode EL1 has conductivity. The first electrode EL1 may be formed of a metal material, a metal alloy, or a conductive compound. The first electrode EL1 may be an anode or a cathode. However, the embodiment is not limited thereto. In an embodiment, the first electrode EL1 may be a pixel electrode. The first electrode EL1 may be a transmissive electrode, a transflective electrode, or a reflective electrode. The first electrode EL1 may include at least one of Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, In, Sn, and Zn, an oxide thereof, a compound thereof, or a mixture thereof.

[0144] If the first electrode EL1 is a transmissive electrode, the first electrode EL1 may include a transparent metal oxide (e.g., indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO)). If the first electrode EL1 is a transflective electrode or a reflective electrode, the first electrode EL1 may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, a compound thereof, or a mixture thereof (e.g., a mixture of Ag and Mg), or a material having a multilayer structure, such as LiF / Ca (a stacked structure of LiF and Ca) or LiF / Al (a stacked structure of LiF and Al). In another embodiment, the first electrode EL1 may have a multilayer structure including a reflective film or a transflective film formed of the above materials, and a transparent conductive film formed of ITO, IZO, ZnO, ITZO, etc. For example, the first electrode EL1 may have a three-layer structure of ITO / Ag / ITO, but the embodiment is not limited thereto. In an embodiment, the first electrode EL1 may include the above metal material, a combination of at least two of the above metal materials, or an oxide of the above metal materials. The thickness of the first electrode EL1 may be about 1000 nm. to about For example, the thickness of the first electrode EL1 may be about to about within the range.

[0145] The first light emitting cell OL1 is provided on the first electrode EL1. The charge generating unit CGL is provided on the first light emitting cell OL1. For example, the charge generating unit CGL may be provided on the first electron transport region ETR1 of the first light emitting cell OL1. The second light emitting cell OL2 is provided on the charge generating unit CGL.

[0146] The first light emitting unit OL1 may include a first hole transport region HTR1, a first emission layer EML1, and a first electron transport region ETR1 stacked in sequence. The second light emitting unit OL2 may include a second emission layer EML2 and a second electron transport region ETR2. In an embodiment, the second light emitting unit OL2 may include a second hole transport region HTR2, a second emission layer EML2, and a second electron transport region ETR2 stacked in sequence.

[0147] The first hole transport region HTR1 and the second hole transport region HTR2 may include at least one of a first hole injection layer HIL1, a first hole transport layer HTL1, a first emission auxiliary layer SE1, and an electron blocking layer (not shown), and at least one of a second hole injection layer HIL2, a second hole transport layer HTL2, a second emission auxiliary layer SE2, and an electron blocking layer (not shown), respectively. The thickness of the first hole transport region HTR1 and the second hole transport region HTR2 may be independently, for example, about 100 Å. to about within the range.

[0148] The first hole transport region HTR1 and the second hole transport region HTR2 may each independently have a single-layer structure of a single layer composed of a single material, a single-layer structure including a single layer of different materials, or a multi-layer structure including a plurality of layers including different materials.

[0149] In an embodiment, the first hole transport region HTR1 and the second hole transport region HTR2 may respectively have a single layer structure of the first hole injection layer HIL1 or the first hole transport layer HTL1 and a single layer structure of the second hole injection layer HIL2 or the second hole transport layer HTL2, or may respectively have a single layer structure formed of a hole injection material and a hole transport material. In an embodiment, the first hole transport region HTR1 and the second hole transport region HTR2 may respectively have a single-layer structure formed of different materials, or may respectively have a structure in which the first hole injection layer HIL1 / first hole transport layer HTL1, the first hole injection layer HIL1 / first hole transport layer HTL1 / first emission auxiliary layer SE1, or the first hole injection layer HIL1 / first hole transport layer HTL1 / first emission auxiliary layer SE1 / electron blocking layer (not shown) are stacked from the first electrode EL1 in the order they are respectively described, and the second hole injection layer HIL2 / second hole transport layer HTL2, the second hole injection layer HIL2 / second hole transport layer HTL2 / second emission auxiliary layer SE2, or the second hole injection layer HIL2 / second hole transport layer HTL2 / second emission auxiliary layer SE2 / electron blocking layer (not shown) are stacked from the first electrode EL1 in the order they are respectively described, but the embodiment is not limited thereto.

[0150] When the first hole transport region HTR1 and the second hole transport region HTR2 include the first emission auxiliary layer SE1 and the second emission auxiliary layer SE2, respectively, the first emission auxiliary layer SE1 and the second emission auxiliary layer SE2 may be patterned and provided in the opening OH (see Figure 2) in the pattern layer. For example, the first emission auxiliary layer SE1 and the second emission auxiliary layer SE2 may respectively include a red emission auxiliary layer SE-R1 overlapping the first light-emitting area PXA-R, a green emission auxiliary layer SE-G1 overlapping the second light-emitting area PXA-G, and a blue emission auxiliary layer SE-B1 overlapping the third light-emitting area PXA-B, as well as a red emission auxiliary layer SE-R2 overlapping the first light-emitting area PXA-R, a green emission auxiliary layer SE-G2 overlapping the second light-emitting area PXA-G, and a blue emission auxiliary layer SE-B2 overlapping the third light-emitting area PXA-B. The first emission auxiliary layer SE1 and the second emission auxiliary layer SE2 may each compensate for the resonance distance according to the wavelength of light emitted from the first emission layer EML1 and the second emission layer EML2, and may each increase the luminous efficiency by adjusting the charge balance. The first emission auxiliary layer SE1 and the second emission auxiliary layer SE2 may also prevent electrons from being injected into the first hole transport area HTR1 and the second hole transport area HTR2, respectively.

[0151] Each of the first and second hole transport regions HTR1 and HTR2 may be formed using various methods such as vacuum deposition, spin coating, casting, Langmuir-Brokett (LB), inkjet printing, laser printing, and / or laser induced thermal imaging (LITI).

[0152] In the light emitting element ED according to the embodiment, the first hole transport region HTR1 and the second hole transport region HTR2 may each independently include a compound represented by Formula H-1:

[0153] [Formula H-1]

[0154]

[0155] In formula H-1, L 1 and L 2 Each of L is independently a directly linked, substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring carbon atoms. In formula H-1, a and b are independently an integer selected from 0 to 10. When a or b is 2 or more, multiple L 1 Group or multiple L 2 The groups may each independently be a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms.

[0156] In formula H-1, Ar 1 and Ar 2and Ar may be each independently a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. 3 It may be a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms.

[0157] In an embodiment, the compound represented by formula H-1 may be a monoamine compound. In another embodiment, the compound represented by formula H-1 may be a compound wherein Ar 1 To Ar 3 In another embodiment, the compound represented by formula H-1 may be a diamine compound wherein Ar 1 and Ar 2 At least one of the carbazole compounds includes a substituted or unsubstituted carbazole group, or may be a carbazole compound in which Ar 1 and Ar 2 At least one of the fluorene compounds includes a substituted or unsubstituted fluorenyl group.

[0158] The compound represented by Formula H-1 may be any compound selected from Compound Group H. However, the compounds listed in Compound Group H are only examples, and the compound represented by Formula H-1 is not limited to Compound Group H:

[0159] [Compound Group H]

[0160]

[0161]

[0162] The first hole transport region HTR1 and the second hole transport region HTR2 may each independently further include, for example, a phthalocyanine compound (eg, copper phthalocyanine), N 1 ,N 1’ -([1,1'-biphenyl]-4,4'-diyl)bis(N 1 -phenyl-N 4 ,N 4-dimethylphenylbenzene-1,4-diamine) (DNTPD), 4,4',4"-[tri(3-methylphenyl)phenylamino]triphenylamine (m-MTDATA), 4,4',4"-tri(N,N-diphenylamino)triphenylamine (TDATA), 4,4',4"-tri[N-(2-naphthyl)-N-phenylamino]triphenylamine (2-TNATA), poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate) (PEDOT / PSS), polyaniline / dodecylbenzenesulfonic acid (PA NI / DBSA), polyaniline / camphorsulfonic acid (PANI / CSA), polyaniline / poly(4-styrenesulfonate) (PANI / PSS), N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPB), triphenylamine-containing polyether ketone (TPAPEK), 4-isopropyl-4'-methyldiphenyliodonium [tetrakis(pentafluorophenyl)borate], dipyrazino[2,3-f:2',3'-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (HAT-CN), etc.

[0163] The first hole transport region HTR1 and the second hole transport region HTR2 may each independently further include carbazole derivatives (e.g., N-phenylcarbazole or polyvinylcarbazole), fluorene derivatives, triphenylamine derivatives (e.g., N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD), 4,4',4"-tri(N-carbazolyl)triphenylamine (TCTA), N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPB), 4,4'-cyclohexylenebis[N,N-bis(4-methylphenyl)aniline] (TAPC), 4,4'-bis[N,N'-(3-tolyl)amino]-3,3'-dimethylbiphenyl (HMTPD), 1,3-bis(N-carbazolyl)benzene (mCP)), etc.

[0164] In an embodiment, the first hole transport region HTR1 and the second hole transport region HTR2 may each independently further include 9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole (CzSi), 9-phenyl-9H-3,9'-bicarbazole (CCP), 1,3-bis(1,8-dimethyl-9H-carbazole-9-yl)benzene (mDCP), etc.

[0165] The first hole transport region HTR1 and the second hole transport region HTR2 may each independently have a thickness of about to about For example, the first hole transport region HTR1 and the second hole transport region HTR2 may each independently have a thickness in the range of about to about When the first hole transport region HTR1 includes the first hole injection layer HIL1, the first hole injection layer HIL1 may have a thickness in the range of about to about When the first hole transport region HTR1 includes the first hole transport layer HTL1, the first hole transport layer HTL1 may have a thickness in the range of about to about When the first hole transport region HTR1 includes an electron blocking layer (not shown), the electron blocking layer (not shown) may have a thickness in the range of about to about If the thickness of the first hole transport region HTR1, the thickness of the first hole injection layer HIL1, the thickness of the first hole transport layer HTL1 and the thickness of the electron blocking layer (not shown) satisfy the above range, satisfactory hole transport characteristics can be obtained without significantly increasing the driving voltage.

[0166] In addition to the aforementioned materials, the first hole transport region HTR1 and the second hole transport region HTR2 may each independently further include a p-dopant. In an embodiment, the p-dopant may be uniformly or non-uniformly dispersed in the first hole transport region HTR1. The p-dopant may include at least one of a metal halide, a quinone derivative, a metal oxide, and a cyano-containing compound, but the embodiment is not limited thereto. For example, the p-dopant may include a metal halide such as CuI or RbI, a quinone derivative such as tetracyanoquinodimethane (TCNQ) or 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), a metal oxide such as tungsten oxide or molybdenum oxide, a cyano compound such as dipyrazino[2,3-f:2',3'-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (HAT-CN) or 4-[[2,3-bis[cyano-(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropyl]-cyanomethyl]-2,3,5,6-tetrafluorobenzonitrile (NDP9), etc., but the embodiment is not limited thereto.

[0167] The first emission layer EML1 and the second emission layer EML2 may include a red emission layer EML-R1 overlapping the first light emitting area PXA-R, a green emission layer EML-G1 overlapping the second light emitting area PXA-G, and a blue emission layer EML-B1 overlapping the third light emitting area PXA-B, and a red emission layer EML-R2 overlapping the first light emitting area PXA-R, a green emission layer EML-G2 overlapping the second light emitting area PXA-G, and a blue emission layer EML-B2 overlapping the third light emitting area PXA-B, respectively. The first emission layer EML1 and the second emission layer EML2 may each independently have a thickness of about to about For example, the first emission layer EML1 and the second emission layer EML2 may each independently have a thickness in the range of about to about The first emission layer EML1 and the second emission layer EML2 may each independently be a single-layer structure of a single layer composed of a single material, a single-layer structure including a single layer of different materials, or a multi-layer structure including a plurality of layers including different materials.

[0168] The first emission layer EML1 and the second emission layer EML2 may each independently include anthracene derivatives, pyrene derivatives, fluoranthene derivatives, 1,2-triphenylene derivatives, dihydrobenzanthracene derivatives, or triphenylene derivatives. For example, the first emission layer EML1 and the second emission layer EML2 may each independently include anthracene derivatives or pyrene derivatives.

[0169] Each of the first emission layer EML1 and the second emission layer EML2 may be formed using various methods such as a vacuum deposition method, a spin coating method, a casting method, a Langmuir-Brockett (LB) method, an inkjet printing method, a laser printing method, and / or a laser induced thermal imaging (LITI) method.

[0170] The first emission layer EML1 and the second emission layer EML2 may each include a host and a dopant. In an embodiment, the first emission layer EML1 may include a compound represented by Formula E-1. For example, the first blue emission layer EML-B1 may include a compound represented by Formula E-1. The compound represented by Formula E-1 may be used as a fluorescent host material.

[0171] [Formula E-1]

[0172]

[0173] In formula E-1, R 31 To R 40 Each of the R groups may independently be a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted thiol group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 10 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may be bonded to an adjacent group to form a ring. For example, R 31 To R 40 It may bond with an adjacent group to form a saturated hydrocarbon ring, an unsaturated hydrocarbon ring, a saturated heterocyclic ring, or an unsaturated heterocyclic ring.

[0174] In Formula E-1, c and d may be an integer selected from 0 to 5, each independently.

[0175] In an embodiment, the compound represented by Formula E-1 may be any compound selected from Compound E1 to Compound E19:

[0176]

[0177]

[0178] In an embodiment, the first emission layer EML1 and the second emission layer EML2 may each independently include a compound represented by formula E-2a and / or a compound represented by formula E-2b. For example, the red emission layers EML-R1 and EML-R2 and the green emission layers EML-G1 and EML-G2 may each independently include a compound represented by formula E-2a and / or a compound represented by formula E-2b. The compound represented by formula E-2a or the compound represented by formula E-2b may be used as a phosphorescent host material.

[0179] [Formula E-2a]

[0180]

[0181] In formula E-2a, a may be an integer selected from 0 to 10; and La may be a directly linked, substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms. When a is 2 or more, a plurality of La groups may each independently be a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms.

[0182] In formula E-2a, A 1 To A 5 can be N or C (R i ). In Formula E-2a, R a To R i Each of the R and R groups may independently be a hydrogen atom, a deuterium atom, a substituted or unsubstituted amine group, a substituted or unsubstituted thiol group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may be bonded to an adjacent group to form a ring. For example, R a To R i It may bond with an adjacent group to form a hydrocarbon ring or a heterocyclic ring containing N, O, S, etc. as a ring atom.

[0183] In formula E-2a, A 1 To A 5Two or three of them can each be N, and A 1 To A 5 The remaining groups in may each independently be C(R i ).

[0184] [Formula E-2b]

[0185]

[0186] In Formula E-2b, Cbz1 and Cbz2 may each independently be an unsubstituted carbazole group or a carbazole group substituted with an aryl group having 6 to 30 ring carbon atoms. b It may be a directly linked, substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring carbon atoms. In Formula E-2b, b may be an integer selected from 0 to 10. When b is 2 or more, multiple L b The groups may each independently be a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms.

[0187] The compound represented by formula E-2a or the compound represented by formula E-2b may be any compound selected from compound group E-2. However, the compounds listed in compound group E-2 are only examples, and the compound represented by formula E-2a or the compound represented by formula E-2b is not limited to compound group E-2.

[0188] [Compound Group E-2]

[0189]

[0190] The first emission layer EML1 and the second emission layer EML2 can each independently further include materials in the related art as the main material. For example, the first emission layer EML1 and the second emission layer EML2 can each independently include at least one of the following as the main material: bis(4-(9H-carbazole-9-yl)phenyl)diphenylsilane (BCPDS), (4-(1-(4-(diphenylamino)phenyl)cyclohexyl)phenyl)diphenyl-phosphine oxide (POPCPA), bis[2-(diphenylphosphino)phenyl]ether oxide (DPEPO), 4,4'-bis(N-carbazole 1,1'-biphenyl (CBP), 1,3-bis(N-carbazolyl)benzene (mCP), 2,8-bis(diphenylphosphoryl)dibenzo[b,d]furan (PPF), 4,4',4"-tri(N-carbazolyl)triphenylamine (TCTA), and 1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene (TPBi). However, the embodiment is not limited thereto. For example, tri(8-hydroxyquinoline)aluminum (Alq 3 ), 9,10-di(naphthalene-2-yl)anthracene (ADN), 2-tert-butyl-9,10-di(naphthalene-2-yl)anthracene (TBADN), distyrylarene (DSA), 4,4'-bis(9-carbazolyl)-2,2'-dimethyl-biphenyl (CDBP), 2-methyl-9,10-bis(naphthalene-2-yl)anthracene (MADN), hexaphenylcyclotriphosphazene (CP1), 1,4-bis(triphenylsilyl)benzene (UGH2), hexaphenylcyclotrisiloxane (DPSiO 3 ), octaphenylcyclotetrasiloxane (DPSiO 4 ) etc. can be used as the main material.

[0191] In an embodiment, the first emission layer EML1 and the second emission layer EML2 may each independently include a compound represented by formula Ma. For example, the red emission layers EML-R1 and EML-R2 and the green emission layers EML-G1 and EML-G2 may each independently include a compound represented by formula Ma. The compound represented by formula Ma may be used as a phosphorescent dopant material.

[0192] [Formula]

[0193]

[0194] In formula Ma, Y 1 To Y 4 and Z 1 To Z 4 can be independently C(R 1 ) or N; and R 1 To R 4Each independently may be a hydrogen atom, a deuterium atom, a substituted or unsubstituted amine group, a substituted or unsubstituted sulfenyl group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or bonded to an adjacent group to form a ring. In formula Ma, m may be 0 or 1, and n may be 2 or 3. In formula Ma, when m is 0, n may be 3, and when m is 1, n may be 2.

[0195] The compound represented by formula Ma may be any compound selected from compound M-a1 to compound M-a25. However, compound M-a1 to compound M-a25 are only examples, and the compound represented by formula Ma is not limited to compound M-a1 to compound M-a25.

[0196]

[0197]

[0198] In an embodiment, the first emission layer EML1 and the second emission layer EML2 may each independently include a compound represented by one of formulas Fa to Fc. For example, the blue emission layers EML-B1 and EML-B2 may each independently include a compound represented by one of formulas Fa to Fc. The compound represented by one of formulas Fa to Fc may be used as a fluorescent dopant material.

[0199] [Formula]

[0200]

[0201] In formula Fa, R a To R j The two of them can be independently The group represented by R is substituted. a To R j Not The remaining groups substituted by the groups represented may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms.

[0202] In by In the group represented by 1 and Ar 2and Ar may each independently be a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. 1 and Ar 2 At least one of them may each independently be a heteroaryl group including O or S as a ring-forming atom.

[0203] [Formula Fb]

[0204]

[0205] In formula Fb, R a and R b Each of Ar and Ar may be independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may be bonded to an adjacent group to form a ring. 1 To Ar 4 and Ar may each independently be a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. 1 To Ar 4 At least one of may be a heteroaryl group including O or S as a ring-forming atom.

[0206] In Formula Fb, U and V may each independently be a substituted or unsubstituted hydrocarbon ring having 5 to 30 ring carbon atoms or a substituted or unsubstituted heterocyclic ring having 2 to 30 ring carbon atoms.

[0207] In formula Fb, the number of rings represented by U and V may be 0 or 1 independently of each other. When the number of U or V is 1, a condensed ring may be present at the portion indicated by U or V, and when the number of U or V is 0, a condensed ring may not be present at the portion indicated by U or V. When the number of U is 0 and the number of V is 1, or when the number of U is 1 and the number of V is 0, the condensed ring having a fluorene core of formula Fb may be a cyclic compound having four rings. When the number of U and V is each 0, the condensed ring having a fluorene core of formula Fb may be a cyclic compound having three rings. When the number of U and V is each 1, the condensed ring having a fluorene core of formula Fb may be a cyclic compound having five rings.

[0208] [Formula Fc]

[0209]

[0210] In Formula Fc, A 1 and A2 can be independently O, S, Se or N (R m ); and R m It may be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. 1 To R 11 Each may independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted boron group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms, or may be bonded to an adjacent group to form a ring.

[0211] In Formula Fc, A 1 and A 2 Each of A and B may independently bond to a substituent of an adjacent ring to form a condensed ring. 1 and A 2 Each independently is N(R m ), A 1 Can be used with R 4 or R 5 bond to form a ring. For example, A 2 Can be used with R 7 or R 8 bonded to form a ring.

[0212] In an embodiment, the first emission layer EML1 and the second emission layer EML2 may each independently further include a styryl derivative (e.g., 1,4-bis[2-(3-N-ethylcarbazolyl)vinyl]benzene (BCzVB), 4-(di-p-tolylamino)-4'-[(di-p-tolylamino)styryl]stilbene (DPAVB), N-(4-((E)-2-(6-((E)-4-(diphenylamino)styryl)naphthalene-2-yl) As dopant materials in the related field, there are many kinds of materials, such as 1,1'-dipyrene, 1,4-dipyrenylbenzene, 1,4-bis(N,N-diphenylamino)pyrene, etc.

[0213] The first emission layer EML1 and the second emission layer EML2 may each independently further include a phosphorescent dopant material of the related art. For example, the phosphorescent dopant material may include a metal complex containing iridium (Ir), platinum (Pt), osmium (Os), gold (Au), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb) or thulium (Tm). For example, bis (4,6-difluorophenylpyridyl-N, C2') picolinyl iridium (III) (FIrpic), bis (2,4-difluorophenylpyridyl)-tetrakis (1-pyrazolyl) borate iridium (III) (FIr6) or octaethylporphyrin platinum (PtOEP) may be used as a phosphorescent dopant material. However, the embodiment is not limited thereto.

[0214] In an embodiment, the first emission layer EML1 and the second emission layer EML2 may each independently include a quantum dot material. The quantum dot may be a II-VI group compound, a III-VI group compound, an I-III-VI group compound, a III-V group compound, a III-II-V group compound, a IV-VI group compound, a IV group element, a IV group compound, or any combination thereof.

[0215] Examples of Group II-VI compounds may include: binary compounds selected from the group consisting of CdSe, CdTe, CdS, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and mixtures thereof; ternary compounds selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, C CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof; a quaternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and mixtures thereof; or any combination thereof.

[0216] Examples of Group III-VI compounds may include: binary compounds such as In 2 S 3 or In 2 Se 3 ; Ternary compounds such as InGaS 3 or InGaSe 3 ; or any combination thereof.

[0217] Examples of Group I-III-VI compounds may include: ternary compounds selected from the group consisting of: AgInS, AgInS 2 、CuInS、CuInS 2 、AgGaS 2 、CuGaS 2 CuGaO 2 、AgGaO 2 、AgAlO 2 and mixtures thereof, quaternary compounds such as AgInGaS 2 or CuInGaS 2 ; or any combination thereof.

[0218] Examples of Group III-V compounds may include: binary compounds selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and mixtures thereof; ternary compounds selected from the group consisting of GaNPs, GaNAs, GaNSb, GaPAs, GaPSb, AlNPs, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb and mixtures thereof; quaternary compounds selected from the group consisting of GaAlNPs, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and mixtures thereof; or any combination thereof. In an embodiment, the Group III-V compound may further include a Group II metal. Examples of the Group III-II-V compound may include InZnP and the like.

[0219] Examples of Group IV-VI compounds may include: binary compounds selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and mixtures thereof; ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and mixtures thereof; quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof; or any combination thereof. Examples of Group IV elements may include Si, Ge, and mixtures thereof. Examples of Group IV compounds may include binary compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0220] Each element included in a binary compound, ternary compound, or quaternary compound may be present in the particles in a uniform concentration distribution or a non-uniform concentration distribution. For example, the formula may indicate the elements included in the compound, but the ratio of the elements in the compound may vary. For example, AgInGaS 2 may indicate AgIn x Ga 1-x S 2 (where x is a real number satisfying 0 < x < 1).

[0221] In an embodiment, the quantum dots may have a single structure, or the quantum dots may have a core-shell structure in which one quantum dot surrounds another quantum dot. The material included in the core may be different from the material included in the shell.

[0222] The shell of the quantum dots may serve as a protective layer to prevent chemical denaturation of the core to maintain semiconductor characteristics, and / or may serve as a charging layer to impart electrophoretic characteristics to the quantum dots. The shell may be a single layer or multiple layers. The interface between the core and the shell may have a concentration gradient in which the concentration of the elements present in the shell decreases toward the center of the core.

[0223] Examples of the shell of the quantum dots may include metal oxides, non-metal oxides, semiconductor compounds, or any combination thereof.

[0224] Examples of metal oxides or non-metal oxides may include: binary compounds such as SiO 2 、Al 2 O 3 、TiO 2 、ZnO、MnO、Mn 2 O 3 、Mn 3 O 4 、CuO、FeO、Fe 2 O 3 、Fe 3 O 4 、CoO、Co 3 O 4 or NiO, or ternary compounds such as MgAl 2 O 4 、CoFe 2 O 4 、NiFe 2 O 4 or CoMn 2 O 4 . However, the embodiments are not limited thereto.

[0225] Examples of semiconductor compounds may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc., but embodiments are not limited thereto.

[0226] The quantum dots may have a full width at half maximum (FWHM) of an emission spectrum equal to or less than about 45 nm. For example, the quantum dots may have a FWHM of an emission spectrum equal to or less than about 40 nm. For example, the quantum dots may have a FWHM of an emission spectrum equal to or less than about 30 nm. Within any of the above ranges, color purity and / or color reproducibility may be improved. Light emitted by the quantum dots may be emitted in all directions, so that a wide viewing angle may be improved.

[0227] The form of the quantum dot is not particularly limited, and may be any shape used in the relevant field. For example, the quantum dot may have a spherical shape, a pyramidal shape, a multi-arm shape, or a cubic shape, or the quantum dot may be in the form of nanoparticles, nanotubes, nanowires, nanofibers, nanoplates, etc.

[0228] As the size of the quantum dots is adjusted or the ratio of elements in the quantum dot compound is adjusted, the energy band gap can be controlled accordingly so that light in various wavelength regions can be obtained from the quantum dot emission layer. Therefore, by implementing quantum dots as described above (using different sizes of quantum dots or different ratios of elements in quantum dot compounds), a light-emitting element that emits light in various wavelength regions can be implemented. For example, the size of the quantum dots or the ratio of elements in the quantum dot compound can be adjusted so that the quantum dots emit red light, green light, and / or blue light. In an embodiment, the quantum dots can be configured to emit white light by combining light of various colors.

[0229] The first electron transport region ETR1 and the second electron transport region ETR2 may respectively include a hole blocking layer (not shown), at least one of the first electron transport layer ETL1 and the first electron injection layer EIL1, and at least one of the hole blocking layer (not shown), the second electron transport layer ETL2 and the second electron injection layer EIL2, but the embodiment is not limited thereto.

[0230] The first electron transport region ETR1 and the second electron transport region ETR2 may each independently be a single-layer structure of a single layer composed of a single material, a single-layer structure including a single layer of different materials, or a multi-layer structure including a plurality of layers including different materials.

[0231] In an embodiment, the first electron transport region ETR1 and the second electron transport region ETR2 may have a single-layer structure of the first electron injection layer EIL1 or the first electron transport layer ETL1 and a single-layer structure of the second electron injection layer EIL2 or the second electron transport layer ETL2, respectively, or may have a single-layer structure formed of an electron injection material and an electron transport material, respectively. In an embodiment, the first electron transport region ETR1 and the second electron transport region ETR2 may have a single-layer structure formed of different materials, respectively, or may have a structure in which the first electron transport layer ETL1 / the first electron injection layer EIL1 or the hole blocking layer (not shown) / the first electron transport layer ETL1 / the first electron injection layer EIL1 are stacked in the order of their respective descriptions from the first emission layer EML1, and a structure in which the second electron transport layer ETL2 /

[0232] The second electron injection layer EIL2 or the hole blocking layer (not shown) / the second electron transport layer ETL2 / the second electron injection layer EIL2 are stacked in the order described in each of the second emission layer EML2, but the embodiment is not limited thereto. The first electron transport region ETR1 and the second electron transport region ETR2 may each independently have, for example, about to about The thickness is within the range of .

[0233] Each of the first electron transport region ETR1 and the second electron transport region ETR2 may be formed using various methods such as vacuum deposition, spin coating, casting, Langmuir-Brokett (LB), inkjet printing, laser printing, and / or laser induced thermal imaging (LITI).

[0234] In the light emitting element ED according to the embodiment, the first electron transport region ETR1 and the second electron transport region ETR2 may each independently include a compound represented by Formula ET-1:

[0235] [Formula ET-1]

[0236]

[0237] In formula ET-1, X 1 To X 3 At least one of them may each be N, and X 1 To X 3 The remaining groups in may each independently be C(R a ). In formula ET-1, R a It may be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. 1To Ar 3 Each may independently be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms.

[0238] In Formula ET-1, a to c may each independently be an integer selected from 0 to 10. In Formula ET-1, L 1 To L 3 Each of L and L is independently a directly linked, substituted or unsubstituted arylene group having 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring carbon atoms. 1 To L 3 A plurality of groups of each of may each independently be a substituted or unsubstituted arylene group having 6 to 30 ring-forming carbon atoms or a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms.

[0239] The first electron transport region ETR1 and the second electron transport region ETR2 may each independently include an anthracene compound. However, the embodiment is not limited thereto, and the first electron transport region ETR1 and the second electron transport region ETR2 may each independently include, for example, tris(8-hydroxyquinoline)aluminum (Alq 3 ), 1,3,5-tris[(3-pyridyl)-phenyl-3-yl]benzene, 2,4,6-tris(3'-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine, 2-(4-(N-phenylbenzimidazol-1-yl)phenyl)-9,10-dinaphthylanthracene, 1,3,5-tris(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene (TPBi), 2,9-dimethyl-4,7-diphenyl 1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), 3-(4-biphenyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole (TAZ), 4-(naphthalene-1-yl)-3,5-diphenyl-4H-1,2,4-triazole (NTAZ), 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole ( t Bu-PBD), bis(2-methyl-8-hydroxyquinoline-N1,O8)-(1,1'-biphenyl-4-hydroxy)aluminum (BAlq), bis(benzoquinoline-10-hydroxy)beryllium (Bebq 2 ), 9,10-di(naphthalene-2-yl)anthracene (ADN), 1,3-bis[3,5-di(pyridin-3-yl)phenyl]benzene (BmPyPhB) or a mixture thereof.

[0240] In an embodiment, the first electron transport region ETR1 and the second electron transport region ETR2 may each independently include at least one compound selected from compound ET1 to compound ET38:

[0241]

[0242]

[0243]

[0244]

[0245] In an embodiment, the first electron transport region ETR1 and the second electron transport region ETR2 may each independently include a metal halide, such as LiF, NaCl, CsF, RbCl, RbI, CuI, and KI; a lanthanide metal, such as Yb; or a co-deposited material of a metal halide and a lanthanide metal. For example, the first electron transport region ETR1 may include KI:Yb, RbI:Yb, LiF:Yb, etc. as a co-deposited material. The first electron transport region ETR1 and the second electron transport region ETR2 may each include a metal oxide (e.g., Li 2 O or BaO) or 8-hydroxyquinoline lithium (Liq), etc., but the embodiment is not limited thereto. The first electron transport region ETR1 and the second electron transport region ETR2 may also be formed of a mixture material including an electron transport material and an insulating organic metal salt. The insulating organic metal salt may be a material having an energy band gap equal to or greater than about 4 eV. For example, the insulating organic metal salt may include a metal acetate, a metal benzoate, a metal acetoacetate, a metal acetylacetonate, or a metal stearate.

[0246] In addition to the aforementioned materials, the first electron transport region ETR1 and the second electron transport region ETR2 may each independently further include at least one of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), diphenyl(4-(triphenylsilyl)phenyl)phosphine oxide (TSPO1) and 4,7-diphenyl-1,10-phenanthroline (Bphen), but the embodiment is not limited thereto.

[0247] The first electron transport region ETR1 and the second electron transport region ETR2 may respectively include the above-mentioned compound of the first electron transport region ETR1 in at least one of the first electron injection layer EIL1, the first electron transport layer ETL1 and the hole blocking layer (not shown), and include the above-mentioned compound of the second electron transport region ETR2 in at least one of the second electron injection layer EIL2, the second electron transport layer ETL2 and the hole blocking layer (not shown).

[0248] When the first electron transport region ETR1 and the second electron transport region ETR2 include the first electron transport layer ETL1 and the second electron transport layer ETL2, respectively, the first electron transport layer ETL1 and the second electron transport layer ETL2 may each independently have a thickness of about 100 nm. to about For example, the first electron transport layer ETL1 and the second electron transport layer ETL2 may each independently have a thickness in the range of about to about If the thickness of the first electron transport layer ETL1 and the second electron transport layer ETL2 each satisfies any of the above ranges, satisfactory electron transport characteristics can be obtained without significantly increasing the driving voltage. When the first electron transport region ETR1 and the second electron transport region ETR2 include the first electron injection layer EIL1 and the second electron injection layer EIL2, respectively, the first electron injection layer EIL1 and the second electron injection layer EIL2 may each independently have a thickness of about to about For example, the first electron injection layer EIL1 and the second electron injection layer EIL2 may each independently have a thickness in the range of about to about If the thicknesses of the first electron injection layer EIL1 and the second electron injection layer EIL2 each satisfy any of the above ranges, satisfactory electron injection characteristics may be obtained without significantly increasing a driving voltage.

[0249] exist FIG. 3A to FIG. 3D , the respective components constituting the first light emitting unit OL1 and the second light emitting unit OL2 are explained as corresponding to each other, but the stacking structure of each of the first light emitting unit OL1 and the second light emitting unit OL2 is not limited to the configuration as explained therein, and may be provided in various combinations according to the display quality characteristics required in the light emitting element ED. For example, in the light emitting element ED according to the embodiment, the second hole transport region HTR2 of the second light emitting unit OL2 may have a structure including the second emission auxiliary layers SE-R2, SE-G2, and SE-B2, and the first hole transport region HTR1 of the first light emitting unit OL1 may have a structure not including the first emission auxiliary layers SE-R1, SE-G1, and SE-B1. For example, in the light emitting element ED according to another embodiment, the second electron transport region ETR2 of the second light emitting unit OL2 may have a structure including the second electron injection layer EIL2, and the first electron transport region ETR1 of the first light emitting unit OL1 may have a structure not including the first electron injection layer EIL1.

[0250] The charge generation unit CGL is disposed between the first light emitting unit OL1 and the second light emitting unit OL2. When a voltage is applied to the charge generation unit CGL, the charge generation unit CGL may generate charges (electrons and holes) by forming a complex through an oxidation-reduction reaction. The charge generation unit CGL may provide the generated charges to each of the adjacent light emitting units OL1 and OL2. The charge generation unit CGL may increase the efficiency of the current generated in each of the adjacent light emitting units OL1 and OL2, and may be used to adjust the charge balance between the adjacent light emitting units OL1 and OL2.

[0251] The charge generation unit CGL includes a p-type charge generation layer p-CGL and an n-type charge generation layer n-CGL. The charge generation unit CGL may have a stacked structure in which the p-type charge generation layer p-CGL and the n-type charge generation layer n-CGL are in contact with each other (e.g., in direct contact). The charge generation unit CGL may have a structure in which the n-type charge generation layer n-CGL and the p-type charge generation layer p-CGL are stacked in sequence from the first light emitting unit OL1.

[0252] The n-type charge generation layer n-CGL may be a charge generation layer that provides electrons to the adjacent light emitting units OL1 and OL2. The n-type charge generation layer n-CGL may include an n-dopant. The n-type charge generation layer n-CGL may be a layer in which an n-dopant is doped in a base material. The p-type charge generation layer p-CGL may be a charge generation layer that provides holes to the adjacent light emitting units OL1 and OL2. The p-type charge generation layer p-CGL may include a p-dopant. The p-type charge generation layer p-CGL may be a layer in which a p-dopant is doped in a base material. Although not illustrated in the drawings, the charge generation unit CGL may further include a buffer layer disposed between the n-type charge generation layer n-CGL and the p-type charge generation layer p-CGL.

[0253] The charge generation layers n-CGL and p-CGL may each include an n-type aromatic amine organic compound or a p-type metal oxide. For example, the charge generation layers n-CGL and p-CGL may each independently include a charge generation compound including an aromatic amine organic compound, a carbazole compound, a metal, a metal oxide, a metal carbonate, a metal fluoride, or a mixture thereof.

[0254] For example, the aromatic amine organic compound may be N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPD), 4,4',4"-tris[N-(2-naphthyl)-N-phenylamino]triphenylamine (2-TNATA), 4,4'4"-tris(N,N-diphenylamino)triphenylamine (TDATA), 4,4',4"-[tris(3-methylphenyl)phenylamino]triphenylamine (m-TDATA), spiro TAD or spiro NPB. For example, the carbazole compound may be 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP). For example, the metal may be cesium (Cs), molybdenum (Mo), vanadium (V), titanium (Ti), tungsten (W), barium (Ba) or lithium (Li). Examples of metal oxides, metal carbonates or metal fluorides may include Re 2 O 7 、MoO 3 、V 2 O 5 , WO 3 、TiO 2 , Cs 2 CO 3 , BaF 2 , LiF or CsF.

[0255] The second electrode EL2 is provided on the second electron transport region ETR2. The second electrode EL2 may be a common electrode. The second electrode EL2 may be a cathode or an anode, but the embodiment is not limited thereto. For example, when the first electrode EL1 is an anode, the second electrode EL2 may be a cathode, and when the first electrode EL1 is a cathode, the second electrode EL2 may be an anode.

[0256] The second electrode EL2 may be a transmissive electrode, a transflective electrode or a reflective electrode. When the second electrode EL2 is a transmissive electrode, the second electrode EL2 may include a transparent metal oxide, such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), etc.

[0257] When the second electrode EL2 is a transflective electrode or a reflective electrode, the second electrode EL2 may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, Yb, W, a compound thereof, or a mixture thereof (e.g., AgMg, AgYb, or MgYb), or a material having a multilayer structure, such as LiF / Ca (a stacked structure of LiF and Ca) or LiF / Al (a stacked structure of LiF and Al). In an embodiment, the second electrode EL2 may have a multilayer structure including a reflective layer or a transflective layer formed of the above materials, and a transparent conductive layer formed of ITO, IZO, ZnO, ITZO, etc. For example, the second electrode EL2 may include the above metal materials, a combination of at least two of the above metal materials, or an oxide of the above metal materials, etc.

[0258] Although not shown in the drawings, the second electrode EL2 may be electrically connected to the auxiliary electrode. If the second electrode EL2 is electrically connected to the auxiliary electrode, the resistance of the second electrode EL2 may be reduced.

[0259] The first capping layer CPL1 is disposed on the second electrode EL2 of the light emitting element ED, and the second capping layer CPL2 is disposed on the first capping layer CPL1. The first capping layer CPL1 may be directly disposed on the second electrode EL2, and the second capping layer CPL2 may be directly disposed on the first capping layer CPL1.

[0260] The first capping layer CPL1 includes a first compound represented by Formula 1. In an embodiment, the first capping layer CPL1 may be an organic layer including the first compound.

[0261] [Formula 1]

[0262]

[0263] In formula 1, L 1 To L 3 and L may each independently be a directly linked, substituted or unsubstituted arylene group having 6 to 12 ring carbon atoms or a substituted or unsubstituted heteroarylene group having 5 to 11 ring carbon atoms. 1 To L 3 Each independently may be a directly linked, unsubstituted phenylene group or an unsubstituted divalent biphenyl group.

[0264] In Formula 1, X may be O or S; and Y may be N or C (R y ).

[0265] In formula 1, R 1 , R 2 , R x and R ymay each independently be a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring-forming carbon atoms. In an embodiment, R 1 and R 2 may be independently substituted or unsubstituted amine, substituted or unsubstituted phenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted benzoxazolyl, substituted or unsubstituted benzothiazolyl, substituted or unsubstituted benzofuranyl or substituted or unsubstituted benzothiophenyl. x and R y can each independently be a hydrogen atom or a deuterium atom. In an embodiment, R 1 or R 2 The amine group may be substituted with an aryl group or a heteroaryl group, so that the first compound represented by Formula 1 may be a diamine compound.

[0266] In Formula 1, n may be an integer selected from 0 to 4. If n is 0, the first compound may not be x Where n is 4 and four R x The case where all R groups are hydrogen atoms may be the same as the case where n is 0. If n is 2 or more, then the plurality of R x The groups may all be identical, or at least one of them may be different from the remaining groups.

[0267] In an embodiment, the first compound represented by Formula 1 may be represented by any one of Formula 1-1 to Formula 1-3:

[0268] [Formula 1-1]

[0269]

[0270] [Formula 1-2]

[0271]

[0272] [Formula 1-3]

[0273]

[0274] In Formula 1-1 to Formula 1-3, R 11 To R 16Each of the R and R groups may independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may be bonded to an adjacent group to form a ring. For example, R 11 To R 16 Each of them may independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted benzoxazolyl group, a substituted or unsubstituted benzothiazolyl group, a substituted or unsubstituted benzofuranyl group or a substituted or unsubstituted benzothiophenyl group.

[0275] In formula 1-3, R x1 and R x2 Each of R and R is independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. x1 and R x2 X may be independently a hydrogen atom or a deuterium atom. 1 and X 2 Each independently is O or S, Y 1 and Y 2 Each independently is N or C(R y ).

[0276] In Formulae 1-1 to 1-3, m1 to m6 may each independently be an integer selected from 0 to 5. If m1 to m6 are each 0, the first compound may not be R 11 To R 16 wherein m1 to m6 are each 5 and R 11 To R 16 The case where each of the five groups in is a hydrogen atom may be the same as the case where m1 to m6 are each 0. If m1 to m6 are each 2 or more, then R 11 To R 16 The multiple groups of each of may all be the same or at least one of them may be different from the remaining groups.

[0277] In Formula 1-3, n1 and n2 may each independently be an integer selected from 0 to 4. If n1 and n2 are each 0, the first compound may not be R x1 and Rx2 Where n1 and n2 are each 4 and the four R x1 Groups and the Four Rs x2 The case where all the groups are hydrogen atoms may be the same as the case where n1 and n2 are each 0. If n1 and n2 are each 2 or more, then the plurality of R x1 Groups and multiple R x2 The groups may all be identical or at least one of them may be different from the remaining groups.

[0278] In formula 1-1 to formula 1-3, X, Y, R x , R y and n are the same as described in Formula 1.

[0279] In an embodiment, the first compound may be any compound selected from the compound group 1. In an embodiment, in the light emitting element ED, the first capping layer CPL1 may include at least one first compound selected from the compound group 1.

[0280] [Compound Group 1]

[0281]

[0282]

[0283]

[0284]

[0285] The second capping layer CPL2 includes the second compound represented by Formula 2-1 or Formula 2-2.

[0286] [Formula 2-1]

[0287]

[0288] In formula 2-1, R a1 To R a6 Each of the R and R groups may independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may be bonded to an adjacent group to form a ring. For example, R a1 To R a6 R and R are each independently a hydrogen atom, a deuterium atom, or a substituted or unsubstituted phenyl group. a1 To R a6Each of them may be bonded to an adjacent group to form a polycyclic ring fused to the benzene portion in Formula 2-1. a2 and R a3 are each independently a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms or a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, and R in Formula 2-1 a2 and R a3 When bonded to each other, the functional group connected to the O atom in Formula 2-1 may include a naphthalene moiety.

[0289] [Formula 2-2]

[0290]

[0291] In formula 2-2, A 1 and A 2 can be N or C (R z ).

[0292] In formula 2-2, R z and R b1 To R b6 Each of the R and R groups may independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or may be bonded to an adjacent group to form a ring. For example, R z and R b1 To R b6 R and R are each independently a hydrogen atom, a deuterium atom, or a substituted or unsubstituted phenyl group. z and R b1 To R b6 Each of them can be bonded to adjacent groups to form a polycyclic ring. b3 and R b4 are each independently a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms or a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, and R in Formula 2-2 b3 and R b4 When bonded to each other, the functional group connected to the O atom in Formula 2-2 may include a naphthalene moiety. As yet another example, when A 1 C(R z ), R z and R b5are each independently a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms or a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, and R in Formula 2-2 z and R b5 When bonded to each other, the Li atom in Formula 2-2 may be connected to a functional group including a quinoline moiety.

[0293] In an embodiment, the second compound may be any compound selected from the compound group 2. In an embodiment, in the light emitting element ED, the second capping layer CPL2 may include at least one second compound selected from the compound group 2.

[0294] [Compound Group 2]

[0295]

[0296] In an embodiment, the first capping layer CPL1 may further include an organic material in addition to the first compound. In an embodiment, the second capping layer CPL2 may further include an organic material in addition to the second compound. The first capping layer CPL1 or the second capping layer CPL2 may each independently further include N,N'-bis(1-naphthyl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine (α-NPD), NPB, TPD, m-MTDATA, Alq 3 , CuPc, N4,N4,N4',N4'-tetrakis(biphenyl-4-yl)biphenyl-4,4'-diamine (TPD15), 4,4',4",N4'-tetrakis(biphenyl-4-yl)biphenyl-4,4'-diamine (TPD15), 4,4',4"-tris(N-carbazolyl)triphenylamine (TCTA), etc., or may each independently further include an epoxy resin or an acrylate (e.g., methacrylate). However, the embodiment is not limited thereto, and in addition to the first compound or the second compound, the first capping layer CPL1 or the second capping layer CPL2 may each independently include at least one of compounds P1 to P5.

[0297]

[0298]

[0299] In an embodiment, the first capping layer CPL1 may further include an inorganic material in addition to the first compound. In an embodiment, the second capping layer CPL2 may further include an inorganic material in addition to the second compound. The first capping layer CPL1 or the second capping layer CPL2 may each independently further include an alkali metal compound (e.g., LiF), an alkaline earth metal compound (e.g., MgF 2 )、SiON、SiNx 、SiO y wait.

[0300] The refractive index of the first capping layer CPL1 may be higher than the refractive index of the second capping layer CPL2. In an embodiment, the refractive index of the first capping layer CPL1 with respect to visible light may be higher than the refractive index of the second capping layer CPL2 with respect to visible light. For example, with respect to visible light having a wavelength of about 450nm, the refractive index of the first capping layer CPL1 may be higher than the refractive index of the second capping layer CPL2. In an embodiment, the first capping layer CPL1 may have a refractive index in the range of about 2.2 to about 6.0 with respect to visible light having a wavelength of about 450nm. In an embodiment, the second capping layer CPL2 may have a refractive index in the range of about 1.0 to about 2.0 with respect to visible light having a wavelength of about 450nm.

[0301] In an embodiment, the sum of the thickness of the first capping layer CPL1 and the thickness of the second capping layer CPL2 may be in the range of about 100 nm to about 300 nm. In an embodiment, a vertical distance from an upper surface of the second electrode EL2 to an upper surface of the second capping layer CPL2 on the third direction axis DR3 may be in the range of about 100 nm to about 300 nm. In an embodiment, the thickness of the first capping layer CPL1 may be greater than the thickness of the second capping layer CPL2. In an embodiment, the first capping layer CPL1 may have a thickness in the range of about 50 nm to about 80 nm, and the second capping layer CPL2 may have a thickness in the range of about 30 nm to about 60 nm.

[0302] Figure 4 is a schematic cross-sectional view of a light emitting element according to an embodiment.

[0303] and FIG. 3A to FIG. 3D compared to, Figure 4 The difference is at least that it explains that the light emitting element ED includes n light emitting units OL1 to OLn. Figure 4 In the formula, n can be any integer equal to or greater than 3.

[0304] refer to Figure 4, the light emitting element ED according to the embodiment may include a first electrode EL1, a second electrode EL2, n light emitting units OL1 to OLn sequentially stacked in the thickness direction between the first electrode EL1 and the second electrode EL2, and n-1 charge generation layers CGL-1 to CGL-n-1 respectively disposed between adjacent light emitting units OL1 to OLn. The first to nth light emitting units OL1 to OLn may respectively include a first hole transport region HTR1, a first emission layer EML1, and a first electron transport region ETR1 to an nth hole transport region HTRn, an nth emission layer EMLn, and an nth electron transport region ETRn stacked in this order. The first to nth light emitting layers EML1 to EMLn may respectively include a first red emission layer EML-R1, a first green emission layer EML-G1, and a first blue emission layer EML-B1 to an nth red emission layer EML-Rn, an nth green emission layer EML-Gn, and an nth blue emission layer EML-Bn. The charge generation layers CGL-1 to CGL-n-1 disposed between adjacent light emitting cells OL1 to OLn may include p-type charge generation layer p-CGL-1 and n-type charge generation layer n-CGL-1 to p-type charge generation layer p-CGL-n-1 and n-type charge generation layer n-CGL-n-1, respectively.

[0305] Figure 5 is a schematic perspective view of a vehicle in which a display device is provided according to an embodiment.

[0306] refer to Figure 5 , the electronic device according to the embodiment may be in the form of a vehicle AM, and may include display devices DD-1, DD-2, DD-3, and DD-4. At least one of the first to fourth display devices DD-1, DD-2, DD-3, and DD-4 may each independently have a Figure 1 The structure of the display device DD is described.

[0307] Figure 5 The first to fourth display devices DD-1, DD-2, DD-3 and DD-4 are explained as display devices arranged inside the vehicle AM. However, this is only an example, and the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 can be arranged in various vehicles (such as bicycles, motorcycles, trains, ships and airplanes). In an embodiment, at least one of the first to fourth display devices DD-1, DD-2, DD-3 and DD-4, each independently having a structure according to the display device DD, can be included in a personal computer, a laptop computer, a personal digital terminal, a game console, a portable electronic device, a television, a monitor or a billboard, etc. However, these are only provided as examples, and the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 can be included in other electronic devices.

[0308] At least one of the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 may each independently include a Figure 2 , FIG. 3A to FIG. 3D and Figure 4 The light emitting element ED according to any one of the embodiments described in .

[0309] refer to Figure 5 The vehicle AM ​​may include a steering wheel HA and a shift lever GR for driving the vehicle AM. The vehicle AM ​​may include a windshield GL disposed so as to face the driver.

[0310] The first display device DD-1 may be disposed in a first area overlapping the steering wheel HA. For example, the first display device DD-1 may be a digital instrument panel displaying first information of the vehicle AM. The first information may include a first scale indicating a driving speed of the vehicle AM, a second scale indicating an engine speed (e.g., revolutions per minute (RPM)), a meter indicating a fuel level, etc. The first scale and the second scale may each be represented by a digital image.

[0311] The second display device DD-2 may be arranged in a second zone facing the driver's seat and overlapping with the windshield GL. The driver's seat may be a seat in which a steering wheel HA is arranged. For example, the second display device DD-2 may be a head-up display (HUD) that displays the second information of the vehicle AM. The second display device DD-2 may be optically transparent. The second information may include a numerical value indicating a driving speed, and may further include information such as the current time. Although not shown in the accompanying drawings, in an embodiment, the second information of the second display device DD-2 may be displayed by projecting onto the windshield GL.

[0312] The third display device DD-3 may be disposed in a third zone adjacent to the shift lever GR. For example, the third display device DD-3 may be disposed between the driver's seat and the passenger seat and may be a central information display (CID) for the vehicle AM ​​that displays the third information. The passenger seat may be a seat spaced apart from the driver's seat, and the shift lever GR may be disposed between the driver's seat and the passenger seat. The third information may include information about traffic or road conditions (e.g., navigation information), information about music or radio being played, information about a displayed video (or image), information about the temperature inside the vehicle AM, and the like.

[0313] The fourth display device DD-4 may be spaced apart from the steering wheel HA and the shift lever GR, and may be disposed in a fourth zone adjacent to one side of the vehicle AM. For example, the fourth display device DD-4 may be a digital side mirror that displays the fourth information. The fourth display device DD-4 may display an image of the exterior of the vehicle AM ​​captured by a camera module CM disposed outside the vehicle AM. The fourth information may include an image of the exterior of the vehicle AM.

[0314] The first to fourth information as described above are provided only as examples, and the first to fourth display devices DD-1, DD-2, DD-3, and DD-4 may further display information about the inside and outside of the vehicle AM. The first to fourth information may include information different from each other. However, the embodiment is not limited thereto, and part of the first to fourth information may include the same information.

[0315] Hereinafter, reference will be made to Examples, Comparative Examples and FIG. 3A to FIG. 3D A light emitting element according to an embodiment is described. The examples described below are provided only as illustrations to help understand the present disclosure, and the scope thereof is not limited thereto.

[0316] 1. Manufacturing of light-emitting components

[0317] The light-emitting elements of Examples and Comparative Examples were produced by the following method.

[0318] (Manufacturing of Light Emitting Element of Example 1)

[0319] In the light emitting element of Example 1, a 15Ω / cm 2 ITO / Ag / ITO Electrode A glass substrate (manufactured by Corning) as a first electrode was cut into a size of about 50 mm×50 mm×0.7 mm, cleaned by ultrasonic wave using isopropyl alcohol and pure water for about 5 minutes each, irradiated with ultraviolet light for about 30 minutes, and exposed to ozone and cleaned. The glass substrate was mounted on a vacuum deposition apparatus.

[0320] A first light-emitting unit is formed on the upper portion of the first electrode. Compound H-1-1 as a hole injection material is doped with F4-TCNQ (2wt%) as a p-dopant, and the doped compound H-1-1 as a hole injection material is deposited on the upper portion of the first electrode with a thickness of about 10nm. Compound H-1-1 as a hole transport material is deposited thereon with a thickness of about 30nm, thereby forming a first hole transport region as a common layer. Compound E-2-1 as a light-emitting main body is doped with compound M-a1 (3wt%) as a light-emitting dopant, and the doped compound E-2-1 as a light-emitting main body is deposited on the upper portion of the first hole transport region with a thickness of about 40nm to overlap with the first light-emitting region, thereby forming a first red emission layer. Compound E-2-24 as a luminescent main body is doped with compound M-a20 (8wt%) as a luminescent dopant, and the doped compound E-2-24 as a luminescent main body is deposited on the upper part of the first hole transport zone with a thickness of about 30nm to overlap with the second luminescent zone, thereby forming a first green emission layer. Compound ET19 as a luminescent main body is doped with compound BD (2wt%) as a luminescent dopant, and the doped compound ET19 as a luminescent main body is deposited on the upper part of the first hole transport zone with a thickness of about 20nm to overlap with the third luminescent zone, thereby forming a first blue emission layer. Therefore, the first emission layer is formed as a pattern layer. Compound ET38 as an electron transport main body is deposited with a thickness of about 30nm to form a first electron transport zone as a common layer.

[0321] A charge generation unit is formed on the first electron transport region. Compound ET36 as an electron transport material is doped with a Yb dopant (3wt%), and the doped compound ET36 as an electron transport material is deposited with a thickness of about 15nm to form an n-type charge generation layer as a common layer. Compound H-1-19 as a hole transport material is doped with F4-TCNQ (8wt%) as a p-dopant, and the doped compound H-1-19 as a hole transport material is deposited on the upper part of the n-type charge generation layer with a thickness of about 10nm, and the compound H-1-19 as a hole transport material is deposited thereon with a thickness of about 30nm, thereby forming a p-type charge generation layer as a common layer.

[0322] A second light-emitting unit is formed on the upper portion of the p-type charge generation layer. Compound H-1-9 is deposited on the upper portion of the p-type charge generation layer so as to overlap with the first light-emitting region, thereby forming a second red emission auxiliary layer of 50nm. Compound H-1-11 is deposited so as to overlap with the second light-emitting region, thereby forming a second green emission auxiliary layer of 20nm. Compound H-1-9 is deposited so as to overlap with the third light-emitting region, thereby forming a second blue emission auxiliary layer of 10nm. Therefore, a second emission auxiliary layer is formed as a pattern layer. By using the same materials as the first red emission layer, the first green emission layer and the first blue emission layer of the first emission layer, a second red emission layer, a second green emission layer and a second blue emission layer having the same thickness of the second emission layer are formed on the upper portion of the second emission auxiliary layer, thereby forming a second emission layer as a pattern layer. Compound ET28 as an electron transport material is deposited with a thickness of 10nm, and compound ET38 as an electron transport material is deposited with a thickness of 30nm to form a second electron transport region as a common layer.

[0323] Ag:Mg (10 wt%) was deposited on the upper portion of the second electron transport region to form The second electrode is a 50 nm thick second electrode. Compound 1 of compound group 1 is deposited on the upper part of the second electrode to form a 50 nm first capping layer, and compound a1 of compound group 2 is deposited on the upper part of the first capping layer to form a 30 nm second capping layer, thereby manufacturing a light-emitting element. Each layer is formed by a vacuum deposition method.

[0324] (Manufacturing of Light Emitting Elements of Examples 2 to 8)

[0325] The light-emitting elements of Examples 2 to 8 were manufactured in substantially the same manner as the stacked structure of the light-emitting element of Example 1. The light-emitting elements of Examples 2 to 8 were manufactured in substantially the same manner as the light-emitting element of Example 1, except that the compounds used in forming the first capping layer and the second capping layer were different from the compounds used in Example 1. The materials used in forming the first capping layer or the second capping layer in Examples 2 to 8 are shown in Table 1 below.

[0326] (Manufacturing of Light Emitting Element of Comparative Example 1)

[0327] The light-emitting element of Comparative Example 1 was manufactured in substantially the same manner as the stacked structure of the light-emitting element of Example 1, except that the light-emitting element of Comparative Example 1 had a structure not including a second capping layer compared to the stacked structure of the light-emitting element in Example 1, and the compound used in forming the first capping layer was different from the compound used in Example 1. The materials used in forming the first capping layer in Comparative Example 1 are shown in Table 1 below.

[0328] (Manufacturing of Light Emitting Elements of Comparative Examples 2 to 4)

[0329] The light-emitting elements of Comparative Examples 2 to 4 were manufactured in substantially the same manner as the stacked structure of the light-emitting element of Example 1. The light-emitting elements of Comparative Examples 2 to 4 were manufactured in substantially the same manner as the light-emitting element of Example 1, except that the compounds used in forming the first capping layer and the second capping layer were different from the compounds used in Example 1. The materials used in forming the first capping layer or the second capping layer in Comparative Examples 2 to 4 are shown in Table 1 below.

[0330] Table 1

[0331]

[0332]

[0333] The compounds used for producing the light emitting elements of Examples and Comparative Examples are disclosed below. The following materials were used for producing the light emitting elements by sublimation purification of commercial products.

[0334]

[0335]

[0336] 2. Characteristics of light-emitting components

[0337] The luminous efficiency of the light-emitting elements of Examples 1 to 8 and Comparative Examples 1 to 4 as described above was evaluated. Table 2 shows the evaluation results of the light-emitting elements of Examples 1 to 8 and Comparative Examples 1 to 4. In order to characterize the light-emitting elements manufactured in Examples 1 to 8 and Comparative Examples 1 to 4, the front luminous efficiency (Cd / A / y) was measured using a luminance meter SR-3AR, and the relative front luminous efficiency was calculated based on the light-emitting element of Comparative Example 1, and the results are shown in Table 2.

[0338] Table 2

[0339]

[0340]

[0341] Referring to Table 2, the light-emitting elements of Examples 1 to 8 each include a first capping layer CPL1 disposed on a second electrode and a second capping layer CPL2 disposed on the first capping layer CPL1. The light-emitting elements of Examples 1 to 8 each include a first compound in the first capping layer CPL1 and a second compound in the second capping layer CPL2. By comparison, the light-emitting element of Comparative Example 1 includes only the first capping layer CPL1 and does not include the second capping layer CPL2. The light-emitting element of Comparative Example 2 includes a first capping layer CPL1 and a second capping layer CPL2, and the second capping layer CPL2 includes the second compound, but the first capping layer CPL1 does not include the first compound. The light-emitting elements of Comparative Examples 3 and 4 each include a first capping layer CPL1 and a second capping layer CPL2, and the first capping layer CPL1 includes the first compound, but the second capping layer CPL2 does not include the second compound. Referring to the result values ​​of the relative front luminous efficiency of the examples and comparative examples of Table 2, it can be confirmed that the light-emitting element according to the embodiment has a high luminous efficiency compared with the light-emitting element of the comparative example. It can be confirmed that the light-emitting elements of Examples 1 to 8 have high light-emitting efficiency compared with the light-emitting elements of Comparative Examples 1 to 4. The light-emitting element according to the embodiment includes a first capping layer CPL1 and a second capping layer CPL2 disposed on the first capping layer CPL1, includes a first compound in the first capping layer CPL1, and includes a second compound in the second capping layer CPL2, and thus can achieve relatively high light-emitting efficiency. A display device including the light-emitting element according to the embodiment can have improved reliability and display characteristics.

[0342] According to an embodiment, a tandem light emitting element including a plurality of light emitting cells includes a first capping layer and a second capping layer, and thus light emitting efficiency may be maximized.

[0343] According to the embodiment, a display device having improved display efficiency may be provided by including the light emitting element according to the embodiment.

[0344] Embodiments have been disclosed herein, and although terms are employed, they are used and interpreted in a general and descriptive sense only and not for purposes of limitation. In some cases, as will be apparent to one of ordinary skill in the art, features, characteristics, and / or elements described in conjunction with an embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless specifically indicated otherwise. Accordingly, one of ordinary skill in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the present disclosure as set forth in the claims.

Claims

1. A light emitting element, comprising: a first electrode; A first light emitting unit disposed on the first electrode and comprising a first emission layer; a charge generating unit disposed on the first light emitting unit; a second light emitting unit disposed on the charge generating unit and comprising a second emission layer; a second electrode disposed on the second light emitting unit; a first capping layer disposed on the second electrode; as well as A second capping layer is provided on the first capping layer, wherein: The first capping layer includes a first compound represented by Formula 1, and The second capping layer includes a second compound represented by Formula 2-1 or Formula 2-2: Formula 1 In formula 1, L1 to L3 are each independently a directly linked, substituted or unsubstituted arylene group having 6 to 12 ring carbon atoms or a substituted or unsubstituted heteroarylene group having 5 to 11 ring carbon atoms, X is O or S, Y is N or C (R y ), R1, R2, R x and R y are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, and n is an integer selected from 0 to 4; Formula 2-1 In formula 2-1, R a1 To R a6 each independently represents a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or bonds to an adjacent group to form a ring; as well as Formula 2-2 In formula 2-2, A1 and A2 are each independently N or C(R z ),and R z and R b1 To R b6 Each is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or bonds to an adjacent group to form a ring.

2. The light emitting element according to claim 1, wherein: The first capping layer has a refractive index in the range of 2.2 to 6.0 with respect to visible light having a wavelength of 450 nm, and The second capping layer has a refractive index in the range of 1.0 to 2.0 with respect to visible light having a wavelength of 450 nm.

3. The light-emitting element according to claim 1, wherein in Formula 1, R1 and R2 are each independently a substituted or unsubstituted amine group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted benzoxazolyl group, a substituted or unsubstituted benzothiazolyl group, a substituted or unsubstituted benzofuranyl group or a substituted or unsubstituted benzothiophenyl group.

4. The light-emitting element according to claim 1, wherein in Formula 2-1 and Formula 2-2, R a1 To R a6 and R b1 To R b6 Each is independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted phenyl group, or bonds with an adjacent group to form a ring.

5. The light-emitting element 1 according to claim 1, wherein the first compound is represented by any one of Formula 1-1 to Formula 1-3: Formula 1-1 Formula 1-2 Formula 1-3 In Formula 1-1 to Formula 1-3, R 11 To R 16 each independently represents a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, or bonds to an adjacent group to form a ring, R x1 and R x2 each independently represents a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms, X1 and X2 are each independently O or S, Y1 and Y2 are each independently N or C(R y ), n1 and n2 are each independently an integer selected from 0 to 4, m1 to m6 are each independently an integer selected from 0 to 5, and X, Y, R x , R y and n are the same as defined in Formula 1.

6. The light-emitting element according to claim 1, wherein the first compound comprises at least one compound selected from compound group 1: Compound Group 1 7. The light-emitting element according to claim 1, wherein the second compound comprises at least one compound selected from compound group 2: Compound Group 2 The light-emitting element according to claim 1 , wherein a thickness of the first capping layer is greater than a thickness of the second capping layer.

9. The light emitting element according to claim 1, wherein: The first emission layer comprises: a first red emission layer emitting red light; A first green emission layer that emits green light; and a first blue emission layer that emits blue light, and The first red emission layer, the first green emission layer, and the first blue emission layer are spaced apart from each other in a plan view, and The second emission layer comprises: a second red emission layer corresponding to the first red emission layer and emitting red light; a second green emission layer corresponding to the first green emission layer and emitting green light; and A second blue emission layer corresponds to the first blue emission layer and emits blue light.

10. A display device, comprising: Basal layer; A circuit layer disposed on the base layer; as well as A display element layer is provided on the circuit layer and includes the light emitting element according to any one of claims 1 to 9.

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