Light emitting element and display device including the same

Abstract

The invention relates to a light emitting element and a display device including the same. A light-emitting element of an embodiment includes a first electrode, a first light-emitting unit on the first electrode and including a first emission layer, a charge generation unit on the first light-emitting unit, a second light-emitting unit on the charge generation unit and including a second emission layer, a second electrode on the second light-emitting unit, and a capping layer on the second electrode, wherein the first light emitting unit includes a first compound including a first portion, the second light emitting unit includes a second compound including a second portion, the capping layer includes a third compound including a third portion, and specific descriptions about the first portion, the second portion, and the third portion are described in the specification.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0111807 filed on August 25, 2023, in the Korean Intellectual Property Office, and Korean Patent Application No. 10-2024-0112976 filed on August 22, 2024, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] Embodiments of the present disclosure herein relate 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 type (or kind) element that shows a fast response time and is driven by a low voltage. Accordingly, an organic light emitting display device including an organic light emitting element can omit a separate light source and has various advantages, including weight reduction, thinness, excellent light emission, and no dependence on viewing angle.

[0005] An organic light emitting element is a display element having an emission layer composed of an organic material between an anode and a cathode. Holes supplied from the anode and electrons supplied from the cathode are recombined in the emission layer to form excitons, and light corresponding to the energy between holes and electrons is generated from the excitons.

[0006] The tandem organic light-emitting element has a structure consisting of multiple layers including two or more stacks of a hole transport layer / emission layer / electron transport layer between an anode and a cathode, and a charge generation layer that assists charge generation and transfer may exist between the stacks. Summary of the invention

[0007] Embodiments of the present disclosure provide a light emitting element having improved light emitting efficiency and element lifetime.

[0008] Embodiments of the present disclosure also provide a display device having excellent display quality by including a light emitting element having improved light emitting efficiency and element lifespan.

[0009] According to an embodiment of the present disclosure, a light-emitting element includes a first electrode, a first light-emitting unit on the first electrode and including a first emission layer, a charge generation unit on the first light-emitting unit, a second light-emitting unit on the charge generation unit and including a second emission layer, a second electrode on the second light-emitting unit, and a capping layer on the second electrode, wherein the first light-emitting unit includes a first compound including a first part, the second light-emitting unit includes a second compound including a second part, the capping layer includes a third compound including a third part, and the first part, the second part and the third part each independently include one of benzothiophene, thienopyridine, thienopyrimidine, thienopyridazine, thienopyrazine, thienotriazine, thienotetrazine, benzothiazole, thiazolopyridine, thiazolopyrimidine, thiazolopyridazine, thiazolopyrazine, thiazolopyrazine, thiazolopyrazine, thiazolopyrazine, thiazolopyrazine, benzothiadiazole, thiadiazolopyridine, thiadiazolopyrimidine, thiadiazolopyridazine, thiadiazolopyrazine, thiadiazolopyrazine and thiadiazotetrazine.

[0010] In an embodiment, the first part, the second part, and the third part may each independently include one of benzothiophene, thienopyridine, benzothiazole, and thiazolopyridine.

[0011] In an embodiment, the third compound may be represented by Formula 1.

[0012] Formula 1

[0013]

[0014] In formula 1, R 1 To R 15 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, 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 R 1 To R 15 At least one of them is a substituent represented by Formula 2.

[0015] Formula 2

[0016]

[0017] In formula 2, A 1 To A 6 Each independently is CR i or N, and R i It is a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or combines with adjacent groups to form a ring.

[0018] In an embodiment, the capping layer may include at least one of the compounds in compound group C.

[0019] In an embodiment, the first emission layer may include a first light-emitting host and a first light-emitting dopant doped in the first light-emitting host and including a first compound, and the second emission layer may include a second light-emitting host and a second light-emitting dopant doped in the second light-emitting host and including a second compound.

[0020] In an embodiment, the first emission layer may include a first red emission layer that emits red light, a first green emission layer that emits green light, and a first blue emission layer that emits blue light, the second emission layer may include a second red emission layer that emits red light, a second green emission layer that emits green light, and a second blue emission layer that emits blue light, at least one of the first red emission layer, the first green emission layer, and the first blue emission layer may include a first compound, and at least one of the second red emission layer, the second green emission layer, and the second blue emission layer may include a second compound.

[0021] In an embodiment, the first red emission layer, the first green emission layer, and the first blue emission layer may be separated from each other on a plane, and the second red emission layer, the second green emission layer, and the second blue emission layer may be separated from each other on a plane.

[0022] In an embodiment, the first red emission layer may include a first red light-emitting body and a first red light-emitting dopant doped in the first red light-emitting body, the second red emission layer may include a second red light-emitting body and a second red light-emitting dopant doped in the second red light-emitting body, the first green emission layer may include a first green light-emitting body and a first green light-emitting dopant doped in the first green light-emitting body, the second green emission layer may include a second green light-emitting body and a second green light-emitting dopant doped in the second green light-emitting body, at least one of the first red light-emitting dopant and the first green light-emitting dopant may include a first compound, and at least one of the second red light-emitting dopant and the second green light-emitting dopant may include a second compound.

[0023] In an embodiment, the first red light emitting dopant, the second red light emitting dopant, the first green light emitting dopant, and the second green light emitting dopant may be phosphorescent dopants.

[0024] In an embodiment, at least one of the first red light-emitting dopant and the first green light-emitting dopant may be represented by Formula 3-1 or Formula 3-2, and at least one of the second red light-emitting dopant and the second green light-emitting dopant may be represented by Formula 3-1 or Formula 3-2.

[0025] Formula 3-1

[0026]

[0027] Formula 3-2

[0028]

[0029] In formula 3-1 and formula 3-2, Y 1 To Y 4 and Z 1 To Z 4 Each independently is CR w or N, R w and R x1 To R x6 R is each independently 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 of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring carbon atoms, or combines with adjacent groups to form a ring, y1 To R y6 and R z1 To R z6 Each is independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group or a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, m1 and m2 are each independently 0 or 1, and n1 and n2 are each independently 2 or 3, wherein if m1 is 0, n1 is 3, if m1 is 1, n1 is 2, if m2 is 0, n2 is 3, and if m2 is 1, n2 is 2.

[0030] In an embodiment, at least one of the first red light-emitting dopant and the first green light-emitting dopant may include at least one of the compounds in compound group R, and at least one of the second red light-emitting dopant and the second green light-emitting dopant may include at least one of the compounds in compound group R.

[0031] In an embodiment, the first blue emission layer may include a first blue light-emitting body and a first blue light-emitting dopant doped in the first blue light-emitting body, the second blue emission layer may include a second blue light-emitting body and a second blue light-emitting dopant doped in the second blue light-emitting body, and at least one of the first blue light-emitting dopant and the second blue light-emitting dopant may include at least one of the compounds in compound group B.

[0032] In an embodiment, the first blue light emitting dopant and the second blue light emitting dopant may be fluorescent dopants.

[0033] In an embodiment, the first light-emitting unit may further include a first hole transport region between the first electrode and the first emission layer and a first electron transport region between the first emission layer and the charge generation unit, and the second light-emitting unit may further include a second hole transport region between the charge generation unit and the second emission layer and a second electron transport region between the second emission layer and the second electrode.

[0034] In an embodiment, at least one of the first hole transport region, the first emission layer, and the first electron transport region may include a first compound, and at least one of the second hole transport region, the second emission layer, and the second electron transport region may include a second compound.

[0035] In an embodiment, at least one of the first hole transport region and the second hole transport region may include at least one of the compounds in the compound group HT.

[0036] In an embodiment, at least one of the first electron transport region and the second electron transport region may include at least one of the compounds in compound group E.

[0037] In an embodiment, each of the first hole transport region and the second hole transport region may include a hole transport layer, a hole injection layer, and an emission auxiliary layer sequentially stacked from the first electrode.

[0038] In an embodiment, the light-emitting element may include a first light-emitting region emitting red light, a second light-emitting region emitting green light, and a third light-emitting region emitting blue light, and a first hole transport region, a first electron transport region, a second hole transport region, a second electron transport region, and a second electrode may be provided as a common layer in the first light-emitting region, the second light-emitting region, and the third light-emitting region.

[0039] A display device according to an embodiment of the present disclosure includes a substrate layer, a circuit layer on the substrate layer, and a display device layer on the circuit layer and including a light-emitting element, wherein the light-emitting element includes a first electrode, a first light-emitting unit on the first electrode and including a first emission layer, a charge generation unit on the first light-emitting unit, a second light-emitting unit on the charge generation unit and including a second emission layer, a second electrode on the second light-emitting unit, and a capping layer on the second electrode, wherein the first light-emitting unit includes a first compound including a first part, and the second light-emitting unit includes a first compound including a first part. The second compound of the second part, the capping layer includes a third compound comprising the third part, and the first part, the second part and the third part each independently include one of benzothiophene, thienopyridine, thienopyrimidine, thienopyridazine, thienopyrazine, thienotriazine, thienotetrazine, benzothiazole, thiazolopyridine, thiazolopyridine, thiazolopyridazine, thiazolopyrazine, thiazotriazine, thiazotetrazine, benzothiadiazole, thiadiazopyridine, thiadiazopyrimidine, thiadiazopyridazine, thiadiazopyrazine, thiadiazotriazine and thiadiazotetrazine. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The attached drawings are included to provide a further understanding of the subject matter of the present disclosure, and are incorporated into and constitute a part of this specification. The drawings illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0041] Figure 1 is a plan view of a display device according to an embodiment of the present disclosure;

[0042] Figure 2 is a cross-sectional view of a display device according to an embodiment of the present disclosure;

[0043] FIG. 3A to FIG. 3D A cross-sectional view schematically showing a light emitting element according to an embodiment of the present disclosure;

[0044] Figure 4 is a cross-sectional view schematically showing a light emitting element according to an embodiment of the present disclosure; and

[0045] Figure 5 A diagram showing a vehicle in which a display device according to an embodiment of the present disclosure is provided. DETAILED DESCRIPTION

[0046] The subject matter of the present disclosure may have various modifications and may be embodied in different forms, and the example embodiments will be explained in more detail with reference to the accompanying drawings. However, the subject matter of the present disclosure may be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, all modifications, equivalents, and alternatives included in the spirit and technical scope of the present disclosure should be included in the present disclosure.

[0047] The same reference numerals refer to the same elements throughout the text. In the accompanying drawings, the dimensions of the structures are magnified for clarity of explanation. 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 spirit or scope of the present disclosure, the first element may be referred to as the second element. Similarly, the second element may be referred to as the first element. As used in this article, unless the context clearly indicates otherwise, the singular form is intended to also include the plural form.

[0048] In the description, it will be further understood that when the terms "comprises" and / or "comprising" are used in this specification, it indicates the presence of the recited features, numbers, steps, operations, elements, parts or a combination thereof, but does not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts or a combination thereof.

[0049] In the description, when a component (layer, film, region, panel, etc.) is referred to as being "on" or "over" another component, it may be "directly on" the other component, or intervening layers may also be present. Conversely, when a component (layer, film, region, panel, etc.) is referred to as being "under" or "beneath" another component, it may be "directly under" the other component, or intervening layers may also be present. Also, when an element is referred to as being "on" another element, it may be under the other element.

[0050] In the description, the term "substituted or unsubstituted" corresponds to being unsubstituted or substituted by at least one substituent selected from the group consisting of: deuterium atoms, halogen atoms, cyano groups, nitro groups, amine groups, silyl groups, oxy groups, sulfenyl groups, sulfinyl groups, sulfonyl groups, carbonyl groups, boron groups, phosphine oxide groups, phosphine sulfide groups, alkyl groups, alkenyl groups, alkynyl groups, hydrocarbon ring groups, aryl groups, and heterocyclic groups. In some embodiments, each of the exemplified substituents may be substituted or unsubstituted. For example, biphenyl groups may be interpreted as aryl groups or phenyl groups substituted by phenyl groups.

[0051] In the description, the term "forming a ring by combining with an adjacent group" may mean forming a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocycle by combining with an adjacent group. Hydrocarbon rings include aliphatic hydrocarbon rings and aromatic hydrocarbon rings. Heterocycles include aliphatic heterocycles and aromatic heterocycles. Hydrocarbon rings and heterocycles may be monocyclic or polycyclic. In some embodiments, the ring formed by combining with an adjacent group may be combined with another ring to form a spiro structure.

[0052] In the description, the term "adjacent group" may mean a substituent that replaces an atom that is directly bonded to the atom substituted by the corresponding substituent, another substituent that replaces the atom substituted by the corresponding substituent, or a substituent that is spatially located closest to the corresponding substituent. For example, in 1,2-dimethylbenzene, two methyl groups may be interpreted as "adjacent groups" to each other, and in 1,1-diethylcyclopentane, two ethyl groups may be interpreted as "adjacent groups" to each other. In some embodiments, in 4,5-dimethylphenanthrene, two methyl groups may be interpreted as "adjacent groups" to each other.

[0053] In the description, the halogen atom may be a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

[0054] In the description, the alkyl group may be of a linear or branched type (or species). The carbon number of 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, 3-methylheptyl, 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-octyl Decyl, n-undecyl, 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 without limitation.

[0055] In the description, cycloalkyl may refer to a cyclic alkyl group. The carbon number of the cycloalkyl group may be 3 to 50, 3 to 30, 3 to 20, or 3 to 10. Examples of cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-tert-butylcyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, norbornyl, 1-adamantyl, 2-adamantyl, isobornyl, bicycloheptyl, etc., without limitation.

[0056] In the description, alkenyl means a hydrocarbon group including one or more carbon-carbon double bonds in the main chain (e.g., in the middle) or end (e.g., terminal) of an alkyl group having a carbon number of 2 or more. The alkenyl group may be a straight chain alkenyl group or a branched chain alkenyl group. The carbon number of the alkenyl group is not specifically limited, but may be 2 to 30, 2 to 20, or 2 to 10. Examples of alkenyl groups include vinyl, 1-butenyl, 1-pentenyl, 1,3-butadienyl, styryl, styrylvinyl, etc., without limitation.

[0057] In the description, alkynyl means a hydrocarbon group including one or more carbon-carbon triple bonds in the main chain (e.g., in the middle) or at the end (e.g., terminal) of an alkyl group having a carbon number of 2 or more. The alkynyl group may be a straight chain alkynyl group or a branched chain alkynyl group. The carbon number of the alkynyl group is not specifically limited, but may be 2 to 30, 2 to 20, or 2 to 10. Examples of alkynyl groups include ethynyl, propynyl, etc., without limitation.

[0058] In the description, the hydrocarbon ring group means an optional functional group or substituent derived from an aliphatic hydrocarbon ring. The hydrocarbon ring group may be a saturated hydrocarbon ring group of 5 to 20 ring-forming carbon atoms.

[0059] In the description, aryl means an optional functional group or substituent derived from an aromatic hydrocarbon ring. The aryl group may be a monocyclic aryl group or a polycyclic aryl group. The carbon number used to form the ring 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., without limitation.

[0060] In the description, the fluorenyl group may be substituted, and two substituents may be bonded together to each other to form a spiro structure.

[0061] The substituted fluorenyl group is exemplified as follows, but embodiments of the present disclosure are not limited thereto.

[0062]

[0063] In the description, heterocyclic groups mean optional functional groups or substituents derived from a ring including one or more of B, O, N, P, Si and S as heteroatoms. Heterocyclic groups include aliphatic heterocyclic groups and aromatic heterocyclic groups. Aromatic heterocyclic groups may be heteroaryl groups. Aliphatic heterocyclic groups and aromatic heterocyclic groups may be monocyclic or polycyclic.

[0064] In the description, the heterocyclic group may include one or more of B, O, N, P, Si and S as heteroatoms. If the heterocyclic group includes two or more heteroatoms, the two or more heteroatoms may be the same or different. The heterocyclic group may be a monocyclic heterocyclic group or a polycyclic heterocyclic group, and the term encompasses heteroaryl. The ring carbons of the heterocyclic group may be 2 to 30, 2 to 20 or 2 to 10.

[0065] In the description, the aliphatic heterocyclic group may include one or more of B, O, N, P, Si, and S as a heteroatom. The number of ring-forming carbon atoms of the aliphatic heterocyclic group may be 2 to 30, 2 to 20, or 2 to 10. Examples of the aliphatic heterocyclic group may include an oxiranyl group, a thiirane group, a pyrrolidinyl group, a piperidinyl group, a tetrahydrofuranyl group, a tetrahydrothienyl group, a thianyl group, a tetrahydropyranyl group, a 1,4-dioxanyl group, and the like without limitation.

[0066] In the description, the heteroaryl group may include one or more of B, O, N, P, Si and S as heteroatoms. If the heteroaryl group includes two or more heteroatoms, the two or more heteroatoms may be the same or different from each other. The heteroaryl group may be a monocyclic heterocyclic group or a polycyclic heterocyclic group. The carbon number of the ring used to form the heteroaryl group may be 2 to 30, 2 to 20 or 2 to 10. Examples of heteroaryl groups may include thiophene, furan, pyrrole, imidazole, pyridine, bipyridine, pyrimidine, triazine, acridinyl, pyridazine, pyrazinyl, quinoline, quinazoline, quinoxaline, phenoxazine, phthalazine, pyridopyrimidine, pyridopyrazine, pyrazinopyrazine, isoquinoline, indole, carbazole, N-arylcarbazole, N-heteroarylcarbazole, N-alkylcarbazole, benzoxazole, benzimidazole, benzothiazole, benzocarbazole, benzothiophene, dibenzothiophene, thienothiophene, benzofuran, phenanthroline, thiazole, isoxazole, oxazole, oxadiazole, thiadiazole, phenothiazine, dibenzosilole, dibenzofuran, etc., without limitation. In addition to benzothiophene, the heteroaryl group including S as the heteroatom may include thienopyridine, thienopyrimidine, thienopyridazine, thienopyrazine, thienotriazine, thienotetrazine, thiazolopyridine, thiazolopyrimidine, thiazolopyridazine, thiazolopyrazine, thiazotriazine, thiazotetrazine, benzothiadiazole, thiadiazolopyridine, thiadiazolopyrimidine, thiadiazolopyridazine, thiadiazolopyrazine, thiadiazotriazine and / or thiadiazotetrazine, and the like.

[0067] In the description, the same explanation of the above-mentioned aryl group can be applied to the arylene group except that the arylene group is a divalent group. The same explanation of the above-mentioned heteroaryl group can be applied to the heteroarylene group except that the heteroarylene group is a divalent group.

[0068] In the description, silyl includes alkylsilyl and arylsilyl. The alkyl in the alkylsilyl may be linear, branched or cyclic. The carbon number in the alkylsilyl is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The carbon number in the arylsilyl is not specifically limited, but may be, for example, 6 to 30, 6 to 20 or 6 to 15. Examples of silyl include trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl, vinyldimethylsilyl, propyldimethylsilyl, triphenylsilyl, diphenylsilyl, phenylsilyl, etc., without limitation.

[0069] In the description, the carbon number of the carbonyl group is not particularly limited, but the carbon number may be 1 to 40, 1 to 30, or 1 to 20.

[0070] For example, the carbonyl group may have one of the following structures, but is not limited thereto.

[0071]

[0072] In the description, the carbon number of the sulfinyl group and the sulfonyl group is not particularly limited, but may be 1 to 30. The sulfinyl group may include an alkylsulfinyl group and an arylsulfinyl group. The sulfonyl group may include an alkylsulfonyl group and an arylsulfonyl group.

[0073] In the description, the thio group may include an alkylthio group and an arylthio group. The thio group may mean an alkyl group or an aryl group defined above that is combined with a sulfur atom. The alkyl group in the alkylthio group may be straight chain, branched chain or cyclic. The carbon number of the alkylthio group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The carbon number of 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 include methylthio, ethylthio, propylthio, pentylthio, hexylthio, octylthio, dodecylthio, cyclopentylthio, cyclohexylthio, phenylthio, naphthylthio, etc., without limitation.

[0074] In the description, the oxy group may mean an alkyl or aryl group defined above that is combined with an oxygen atom. The oxy group may include an alkoxy group and an aryloxy group. The alkoxy group may be linear, branched or cyclic. The carbon number of the alkoxy group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The carbon number of 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. However, embodiments of the present disclosure are not limited thereto.

[0075] In the description, a boryl group may mean an alkyl or aryl group defined above that is combined with a boron atom. Boryl groups include alkyl boryl groups and aryl boryl groups. The alkyl group in the alkyl boryl group may be linear, branched or cyclic. The carbon number of the alkyl boryl group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The carbon number of 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 include dimethyl boryl, diethyl boryl, tert-butyl methyl boryl, diphenyl boryl, phenyl boryl, etc., without limitation.

[0076] In the description, the carbon number of the amine group is not specifically limited, but may be 1 to 30. The amine group may include an alkylamine group and an arylamine group. The alkyl group in the alkylamine group may be linear, branched or cyclic. The carbon number of the alkylamine group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10. The carbon number of 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 include methylamine, dimethylamine, phenylamine, diphenylamine, naphthylamine, 9-methyl-anthrylamine, etc., without limitation.

[0077] 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.

[0078]

[0079] 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.

[0080]

[0081] 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.

[0082]

[0083] 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.

[0084]

[0085] In the description, 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, and alkylamine group may be the same as exemplified above.

[0086] In the description, the aryl group in the aryloxy group, arylthio group, arylsulfonyl group, arylsulfinyl group, arylboryl group, arylsilyl group, arylphosphine oxide group, arylphosphine sulfide group, and arylamine group may be the same as exemplified above.

[0087] In the description, directly connected may mean a single bond (eg, a single covalent bond or a single coordinate covalent bond, which may also be referred to as a coordinate bond).

[0088] In the description, Indicates the location to be connected.

[0089] Hereinafter, embodiments of the present disclosure will be explained with reference to the accompanying drawings.

[0090] Figure 1 2 is a plan view showing a display device DD according to the embodiment. Figure 2 is a cross-sectional view of a display device DD according to an embodiment. Figure 2 To show along Figure 1 A cross-sectional view of a portion taken along line I-I'.

[0091] The display device DD includes a display panel DP and an optical layer PL on the display panel DP. The display panel DP may include light emitting elements ED-1, ED-2, and ED-3. The display device DD includes a plurality of light emitting elements ED-1, ED-2, and ED-3. The optical layer PL may be on the display panel DP and control light reflected at the display panel DP by external light. The optical layer PL may include, for example, a polarizing layer and / or a color filter layer. In some embodiments, the optical layer PL may be omitted from the display device DD.

[0092] On the optical layer PL, a base substrate BL may be provided. The base substrate BL may be a member providing a base surface on which the optical layer PL is provided. The base substrate BL may be a glass substrate, a metal substrate, a plastic substrate, etc. However, the embodiments of the present disclosure are not limited thereto, and the base substrate BL may be an inorganic layer, an organic layer, or a composite material layer. In some embodiments, the base substrate BL may be omitted.

[0093] The display device DD according to the embodiment may further include a filling layer (not shown). The filling layer (not shown) may be between the display device layer DP-ED and the base substrate BL. The filling layer (not shown) may be an organic layer. The filling layer (not shown) may include at least one of an acrylic resin, a silicone resin, and an epoxy resin.

[0094] The display panel DP may include a base layer BS, a circuit layer DP-CL provided on the base layer BS, and a display device layer DP-ED. The display device layer DP-ED may include a pixel defining layer PDL, light emitting elements ED-1, ED-2, and ED-3 disposed between portions of the pixel defining layer PDL, and an encapsulation layer TFE on the light emitting elements ED-1, ED-2, and ED-3.

[0095] The base layer BS may be a member providing a base surface on which the display device layer DP-ED is provided. The base layer BS may be a glass substrate, a metal substrate, a plastic substrate, etc. However, the embodiments of the present disclosure are not limited thereto, and the base layer BS may be an inorganic layer, an organic layer, or a composite material layer.

[0096] In an embodiment, the circuit layer DP-CL may be on the base layer BS, and the circuit layer DP-CL may include a plurality of transistors (not shown). Each of the plurality of transistors (not shown) may 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 device layer DP-ED.

[0097] 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. Each of the light emitting elements ED-1, ED-2 and ED-3 may have a FIG. 3A to FIG. 3DThe structure of the light-emitting element ED of the embodiment of the present invention will be further explained below. Each of the light-emitting elements ED-1, ED-2 and ED-3 may 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. Each of the light-emitting elements ED-1, ED-2 and ED-3 may be a light-emitting element of a series structure. In each of the light-emitting elements ED-1, ED-2 and ED-3, two light-emitting units may emit light in the same wavelength region.

[0098] 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 It is explained that 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 in the opening portion OH defined in the pixel defining layer 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 provided as a common layer in the entire light emitting elements ED-1, ED-2 and ED-3. However, the embodiments of the present disclosure are not limited thereto, and are different from Figure 2 In an embodiment, at least a portion 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 be patterned in the opening portion OH defined in the pixel defining layer PDL, and provided as a pattern layer. In the description, a "common layer" may be provided in common throughout the light-emitting elements ED-1, ED-2, and ED-3 to substantially form one element, and a "pattern layer" may be patterned and provided separately in the opening portion OH defined in the pixel defining layer PDL. For example, in an embodiment, the first hole transport region HTR1, 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 of the light-emitting elements ED-1, ED-2, and ED-3 may be patterned and provided by an inkjet printing method as needed.

[0099] The encapsulation layer TFE may cover the light emitting elements ED-1, ED-2 and ED-3. The encapsulation layer TFE may encapsulate the light emitting elements ED-1, ED-2 and ED-3 in the display device layer DP-ED. The encapsulation layer TFE may be a thin film encapsulation layer. The encapsulation layer TFE may be a stacked layer of one layer or a plurality of layers. The encapsulation layer TFE includes at least one insulating layer (e.g., an electrical insulating layer). The encapsulation layer TFE according to an embodiment may include at least one inorganic layer (hereinafter, an encapsulation inorganic layer). In some embodiments, the encapsulation layer TFE according to an embodiment may include at least one organic layer (hereinafter, an encapsulation organic layer) and at least one encapsulation inorganic layer.

[0100] The encapsulated inorganic layer protects the display device layer DP-ED from moisture / oxygen, and the encapsulated organic layer protects the display device layer DP-ED from foreign substances (such as dust particles). The encapsulated inorganic layer may include silicon nitride, silicon oxynitride, silicon oxide, titanium oxide and / or aluminum oxide, without specific restrictions. The encapsulated organic layer may include acrylic compounds, epoxy compounds, etc. The encapsulated organic layer may include a photopolymerizable organic material, without specific restrictions.

[0101] The encapsulation layer TFE may be on the second electrode EL2, and may be provided while filling the open hole portion OH.

[0102] 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 be areas that emit 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 separated from each other on a plane.

[0103] The light-emitting areas PXA-R, PXA-G, and PXA-B may be areas separated by the pixel defining layer 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 be an area corresponding to the pixel defining layer PDL. In some embodiments, each of the light-emitting areas PXA-R, PXA-G, and PXA-B may correspond to each pixel. The pixel defining layer PDL may divide 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 provided and divided in the opening portion OH defined in the pixel defining layer PDL.

[0104] The light emitting areas PXA-R, PXA-G, and PXA-B may be divided into a plurality of groups according to the colors of the lights generated by the light emitting elements ED-1, ED-2, and ED-3. Figure 1 and Figure 2 In the display device DD of the embodiment shown in , three light-emitting areas PXA-R, PXA-G and PXA-B that emit red light, green light and blue light, respectively, are explained as an embodiment. For example, the display device DD of the embodiment may include a first light-emitting area as a red light-emitting area PXA-R, a second light-emitting area as a green light-emitting area PXA-G, and a third light-emitting area as a blue light-emitting area PXA-B that are separated from each other.

[0105] In the display device DD according to the embodiment, the plurality of light emitting elements ED-1, ED-2, and ED-3 may emit light having different wavelength regions. 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. In some embodiments, each of 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.

[0106] However, the embodiments of the present disclosure are 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 thereof may emit light in a different wavelength region.

[0107] The light emitting areas PXA-R, PXA-G, and PXA-B in the display device DD according to the embodiment may be provided in a stripe shape. Figure 1 , a plurality of red light emitting areas PXA-R, a plurality of green light emitting areas PXA-G, and a plurality of blue light emitting areas PXA-B may be provided along the second direction axis DR2. In some embodiments, the red light emitting areas PXA-R, the green light emitting areas PXA-G, and the blue light emitting areas PXA-B may be provided alternately (e.g., sequentially) 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.

[0108] exist Figure 1 and Figure 2 , the areas of the light emitting regions PXA-R, PXA-G, and PXA-B are shown to be the same, but the embodiments of the present disclosure are not limited thereto. The areas 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. In some embodiments, the areas of the light emitting regions PXA-R, PXA-G, and PXA-B may refer to the area on the plane defined by the first direction axis DR1 and the second direction axis DR2.

[0109] In some embodiments, the arrangement type of the light emitting areas PXA-R, PXA-G, and PXA-B is not limited to Figure 1 The configuration shown in FIG. 1 and the arrangement sequence of the red light emitting areas PXA-R, the green light emitting areas PXA-G, and the blue light emitting areas PXA-B may be provided in various appropriate combinations according to the characteristics of the display quality required or desired by the display device DD. For example, the arrangement type of the light emitting areas PXA-R, PXA-G, and PXA-B may be: Arrangement structure (eg, RGBG matrix, RGBG structure, or RGBG matrix structure) or DIAMOND Arrangement structure, but the present disclosure is not limited thereto. It is an officially registered trademark of Samsung Display Co., Ltd.

[0110] In some embodiments, the areas of the emission regions PXA-R, PXA-G, and PXA-B may be different from each other. For example, in an embodiment, the area of ​​the green emission region PXA-G may be smaller than the area of ​​the blue emission region PXA-B, but the embodiments of the present disclosure are not limited thereto.

[0111] FIG. 3A to FIG. 3D FIG. 1 is a cross-sectional view schematically showing a light emitting element according to an embodiment.

[0112] refer to Figure 3A According 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 and a capping layer CPL. 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.

[0113] and Figure 3A compared to, Figure 3B 1 shows a 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 under the second emission layer EML2. Figure 3B compared to, Figure 3CA cross-sectional view of a light emitting element ED is shown, wherein 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 cross-sectional view of such a light emitting element ED is shown, wherein the first hole transport region HTR1 and the second hole transport region HTR2 include first emission auxiliary layers SE-R1, SE-G1 and SE-B1 and a first hole injection layer HIL1, and second emission auxiliary layers SER2, SE-G2 and SE-B2 and a second hole injection layer HIL2, respectively.

[0114] Below, we will refer to FIG. 3A to FIG. 3D The constituent elements included in each of the light emitting elements ED are explained.

[0115] The first electrode EL1 has electrical conductivity (e.g., electrical conductivity). The first electrode EL1 may be formed using a metal material, a metal alloy and / or a conductive compound (e.g., a conductive compound). The first electrode EL1 may be an anode or a cathode. However, the embodiments of the present disclosure are not limited thereto. In addition, 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 selected from Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF, Mo, Ti, W, In, Sn and Zn, a compound selected from two or more thereof, a mixture selected from two or more thereof, and / or an oxide thereof.

[0116] If the first electrode EL1 is a transmissive electrode, the first electrode EL1 may include a transparent metal oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO) and / 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 some embodiments, the first electrode EL1 may have a structure of multiple layers, including a reflective layer or a transflective layer formed using the above materials and a transmissive conductive layer formed using ITO, IZO, ZnO and / or ITZO. For example, the first electrode EL1 may have a three-layer structure of ITO / Ag / ITO. However, embodiments of the present disclosure are not limited thereto. The first electrode EL1 may include the above metal material, a combination of two or more metal materials selected from the above metal materials, and / or an oxide of the above metal material. The thickness of the first electrode EL1 may be about to about For example, the thickness of the first electrode EL1 may be about to about

[0117] 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. 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.

[0118] The first light-emitting unit OL1 includes a first compound including a first part. The second light-emitting unit OL2 includes a second compound including a second part. The first compound and the second compound may be compounds including a first part and a second part, respectively. For example, the first compound may be a metal complex in which a substituent including the first part is bonded to a metal as a ligand, and the second compound may be a metal complex in which a substituent including the second part is bonded to a metal as a ligand. However, the types of the first compound and the second compound are not limited thereto, and as long as the first part and the second part are included as part of the structure of the first compound and the second compound, the first compound and the second compound may have various chemical formulas without limitation. In some embodiments, if necessary or desired, the first compound and the second compound may have the same chemical structure or different chemical structures from each other. The first compound and the second compound will be explained in more detail in the description of the first emission layer EML1 included in the first light-emitting unit OL1 and the second emission layer EML2 in the second light-emitting unit OL2, which will be further explained.

[0119] The first part and the second part each independently include one of benzothiophene, thienopyridine, thienopyrimidine, thienopyridazine, thienopyrazine, thienotriazine, thienotetrazine, benzothiazole, thiazolopyridine, thiazolopyridine, thiazolopyridazine, thiazolopyrazine, thiazotriazine, thiazotetrazine, benzothiadiazole, thiadiazole pyridine, thiadiazole pyridine, thiadiazole pyridazine, thiadiazole pyrazine, thiadiazole triazine and thiadiazole tetrazine. For example, the first part and the second part can each independently include one of benzothiophene, thienopyridine, benzothiazole and thiazolopyridine. In some embodiments, the term "including the first part" can mean "including the chemical structure comprising the first part as a part". For example, “a first portion including the above-mentioned benzothiophene, benzothiazole, or thienopyridine” may mean “including a chemical structure of a first portion including benzothiophene, benzothiazole, or thienopyridine as a portion”, but embodiments of the present disclosure are not limited thereto.

[0120] 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 stacked in sequence. 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.

[0121] At least one of the first hole transport region HTR1, the first emission layer EML1, and the first electron transport region ETR1 of the first light emitting unit OL1 may include a first compound including a first portion. At least one of the second hole transport region HTR2, the second emission layer EML2, and the second electron transport region ETR2 of the second light emitting unit OL2 may include a second compound including a second portion. For example, the first emission layer EML1 of the first light emitting unit OL1 and the second emission layer EML2 of the second light emitting unit OL2 may include a first compound and a second compound, respectively. In some embodiments, each of the first hole transport region HTR1, the first emission layer EML1, and the first electron transport region ETR1 of the first light emitting unit OL1 may include a first compound, and each of the second hole transport region HTR2, the second emission layer EML2, and the second electron transport region ETR2 of the second light emitting unit OL2 may include a second compound.

[0122] The first and second hole transport regions HTR1 and HTR2 may include at least one of first and second hole injection layers HIL1 and HIL2, first and second hole transport layers HTL1 and HTL2, first and second emission auxiliary layers SE1 and SE2, and an electron blocking layer (not shown). The thickness of each of the first and second hole transport regions HTR1 and HTR2 may be, for example, about 1000 Å. to about

[0123] Each of the first and second hole transport regions HTR1 and HTR2 may have a single-layer structure of a single layer formed using a single material, a single-layer structure of a single layer formed using a plurality of different materials, or a multi-layer structure including a plurality of layers formed using a plurality of different materials.

[0124] For example, the first and second hole transport regions HTR1 and HTR2 may have a single layer structure of the first and second hole injection layers HIL1 and HTL1, respectively, or may have a single layer structure formed using a hole injection material and a hole transport material. In some embodiments, the first hole transport region HTR1 and the second hole transport region HTR2 may have a single-layer structure formed using a plurality of different materials, or a structure of a first hole injection layer HIL1 / first hole transport layer HTL1, a first hole injection layer HIL1 / first hole transport layer HTL1 / first emission auxiliary layer SE1, or a first hole injection layer HIL1 / first hole transport layer HTL1 / electron blocking layer (not shown) stacked from the first electrode EL1, and a structure of a second hole injection layer HIL2 / second hole transport layer HTL2, a second hole injection layer HIL2 / second hole transport layer HTL2 / second emission auxiliary layer SE2, or a second hole injection layer HIL2 / second hole transport layer HTL2 / electron blocking layer (not shown). However, the embodiments of the present disclosure are not limited thereto. If 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 pattern layers patterned and provided in the open hole portion OH (see Figure 2 ). For example, the first emission auxiliary layer SE1 and the second emission auxiliary layer SE2 may include a first red emission auxiliary layer SE-R1, a first green emission auxiliary layer SE-G1 and a first blue emission auxiliary layer SE-B1 and a second red emission auxiliary layer SE-R2, a second green emission auxiliary layer SE-G2 and a second blue emission auxiliary layer SE-B2, which overlap with the red light emitting area PXA-R, the green light emitting area PXA-G and the blue light emitting area PXA-B, respectively. The first emission auxiliary layer SE1 and the second emission auxiliary layer SE2 may 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 control the charge balance to increase the light emitting efficiency. In some embodiments, the first emission auxiliary layer SE1 and the second emission auxiliary layer SE2 may prevent or reduce the injection of electrons into the first hole transport region HTR1 and the second hole transport region HTR2.

[0125] The first hole transport region HTR1 and the second hole transport region HTR2 may be formed using various appropriate methods such as vacuum deposition, spin coating, casting, Langmuir-Brokett (LB), inkjet printing, laser printing, and / or laser induced thermal imaging (LITI).

[0126] Each of the first hole transport region HTR1 and the second hole transport region HTR2 may include a compound represented by Formula H-1.

[0127] Formula H-1

[0128]

[0129] In the above formula H-1, L 1 and L 2 L may be independently a directly connected, substituted or unsubstituted arylene group of 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroarylene group of 2 to 30 ring carbon atoms. "a" and "b" may be independently an integer selected from 0 to 10. In some embodiments, if "a" or "b" is an integer of 2 or more, multiple L 1 and multiple L 2 Each may independently be a 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.

[0130] In formula H-1, Ar 1 and Ar 2 and Ar may be independently substituted or unsubstituted aryl groups having 6 to 30 ring carbon atoms or substituted or unsubstituted heteroaryl groups 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.

[0131] The compound represented by formula H-1 may be a monoamine compound. In some embodiments, the compound represented by formula H-1 may be a compound wherein Ar 1 To Ar 3 In some embodiments, 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 wherein Ar 1 and Ar 2 At least one of the fluorene compounds includes a substituted or unsubstituted fluorenyl group.

[0132] The compound represented by Formula H-1 may be represented by one of the compounds in the following Compound Group H. However, the compounds shown in Compound Group H are only examples, and the compound represented by Formula H-1 is not limited to the compounds represented in Compound Group H below.

[0133] Compound Group H

[0134]

[0135]

[0136] In an embodiment, the first hole transport region HTR1 may include a first compound including a first portion among the compounds represented by Formula H-1. The second hole transport region HTR2 may include a second compound including a second portion among the compounds represented by Formula H-1. That is, the first hole transport region HTR1 and the second hole transport region HTR2 may include a first compound represented by Formula H-1 and a second compound represented by Formula H-1, respectively.

[0137] In formula H-1, L 1 and L 2 It may be a substituted or unsubstituted heteroarylene group having 2 to 30 ring-forming carbon atoms including the first part or the second part. 1 and L 2 The substituted or unsubstituted benzothiophenyl group, substituted or unsubstituted thienopyridinyl group, substituted or unsubstituted thienopyrimidinyl group, substituted or unsubstituted thienopyridazinyl group, substituted or unsubstituted thienopyrazinyl group, substituted or unsubstituted thienotriazinyl group, substituted or unsubstituted thienotetrazinyl group, substituted or unsubstituted benzothiazolyl group, substituted or unsubstituted thiazolopyridinyl group, substituted or unsubstituted thiazolopyrimidinyl group, substituted or unsubstituted thiazolyl group, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyridinyl, substituted or unsubstituted thiazolopyrimidinyl, substituted or unsubstituted thiazolopyridazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl and substituted or unsubstituted thiazolopyrazinyl. For example, L 1 and L 2 Each independently may be a substituted or unsubstituted benzothienyl group, a substituted or unsubstituted thienopyridyl group, a substituted or unsubstituted benzothiazolyl group, or a substituted or unsubstituted thiazolopyridyl group.

[0138] In formula H-1, Ar 1 and Ar 2 It may be a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms including the first part or the second part. 1 and Ar 2The substituted or unsubstituted benzothiophenyl group, substituted or unsubstituted thienopyridinyl group, substituted or unsubstituted thienopyrimidinyl group, substituted or unsubstituted thienopyridazinyl group, substituted or unsubstituted thienopyrazinyl group, substituted or unsubstituted thienotriazinyl group, substituted or unsubstituted thienotetrazinyl group, substituted or unsubstituted benzothiazolyl group, substituted or unsubstituted thiazolopyridinyl group, substituted or unsubstituted thiazolopyrimidinyl group, substituted or unsubstituted thiazolyl group, substituted or unsubstituted thiazolopyrazinyl, ... 1 and Ar 2 Each independently may be a substituted or unsubstituted benzothienyl group, a substituted or unsubstituted thienopyridyl group, a substituted or unsubstituted benzothiazolyl group, or a substituted or unsubstituted thiazolopyridyl group.

[0139] The first compound or the second compound represented by Formula H-1 may be represented by one of the compounds in Compound Group HT. However, the compounds shown in Compound Group HT are examples, and the first compound or the second compound represented by Formula H-1 is not limited to the compounds represented in Compound Group HT.

[0140] Compound Group HT

[0141]

[0142]

[0143] Each of the first hole transport region HTR1 and the second hole transport region HTR2 may include a phthalocyanine compound such as copper phthalocyanine, N1,N1′-([1,1′-biphenyl]-4,4′-diyl)bis(N1-phenyl-N4,N4-di-m-tolylbenzene-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-ethylenedioxy) Thiophene) / poly(4-styrene sulfonate) (PEDOT / PSS), polyaniline / dodecylbenzenesulfonic acid (PANI / DBSA), polyaniline / camphorsulfonic acid (PANI / CSA), polyaniline / poly(4-styrene sulfonate) (PANI / PSS), N,N'-di(naphthalen-1-yl)-N,N'-diphenyl-benzidine (NPB), triphenylamine-containing polyetherketone (TPAPEK), 4-isopropyl-4'-methyldiphenyliodonium [tetrakis(pentafluorophenyl)borate] and / or dipyrazino[2,3-f:2',3'-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (HAT-CN).

[0144] Each of the first hole transport region HTR1 and the second hole transport region HTR2 may further include carbazole derivatives (such as N-phenylcarbazole and / or polyvinylcarbazole), fluorene derivatives and / or triphenylamine derivatives (such as 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.

[0145] In some embodiments, each of the first hole transport region HTR1 and the second hole transport region HTR2 may 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), and the like.

[0146] The first hole transport region HTR1 and the second hole transport region HTR2 may respectively include a compound of the first hole transport region HTR1 in at least one of the first hole injection layer HIL1, the first hole transport layer HTL1, the second emission auxiliary layer SE2 and the electron blocking layer (not shown), and include a compound of the second hole transport region HTR2 in at least one of the second hole injection layer HIL2, the second hole transport layer HTL2, the second emission auxiliary layer SE2 and the electron blocking layer (not shown).

[0147] The thickness of each of the first hole transport region HTR1 and the second hole transport region HTR2 may be about 100 mm. to about For example, about to about If the first hole transport region HTR1 and the second hole transport region HTR2 include the first hole injection layer HIL1 and the second hole injection layer HIL2, respectively, the thickness of each of the first hole injection layer HIL1 and the second hole injection layer HIL2 may be, for example, about 100 Å. to about If the first and second hole transport regions HTR1 and HTR2 include first and second hole transport layers HTL1 and HTL2, respectively, the thickness of each of the first and second hole transport layers HTL1 and HTL2 may be about 100 Å. to about For example, if the first hole transport region HTR1 and the second hole transport region HTR2 include an electron blocking layer (not shown), the thickness of the electron blocking layer (not shown) may be about 1000 Å. to about If the thicknesses of the first and second hole transport regions HTR1 and HTR2, the first and second hole injection layers HIL1 and HIL2, the first and second hole transport layers HTL1 and HTL2, and the electron blocking layer (not shown) satisfy the above ranges, appropriate or satisfactory hole transport characteristics can be achieved without significantly increasing the driving voltage.

[0148] In addition to the above materials, each of the first hole transport region HTR1 and the second hole transport region HTR2 may further include a p-dopant. The p-dopant may be uniformly or non-uniformly dispersed in the first hole transport region HTR1 and the second hole transport region HTR2. The p-dopant may include at least one of a metal halide, a quinone derivative, a metal oxide, and a cyano-containing compound without limitation. For example, the p-dopant may include metal halides such as CuI and / or RbI, quinone derivatives such as tetracyanoquinodimethane (TCNQ) and / or 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanoquinodimethane (F4-TCNQ), metal oxides such as tungsten oxide and / or molybdenum oxide, cyano compounds such as dipyrazino[2,3-f:2',3'-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (HAT-CN) and / or 4-[[2,3-bis[cyano-(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropylidene]-cyanomethyl]-2,3,5,6-tetrafluorobenzonitrile (NDP9), etc., without limitation.

[0149] The first emission layer EML1 and the second emission layer EML2 may include first red emission layers EML-R1 and second red emission layers EML-R2 overlapping the red light emitting region PXA-R, first green emission layers EML-G1 and second green emission layers EML-G2 overlapping the green light emitting region PXA-G, and first blue emission layers EML-B1 and second blue emission layers EML-B2 overlapping the blue light emitting region PXA-B. Each of the first emission layer EML1 and the second emission layer EML2 may have a thickness of about to about or about to about Each of the first emission layer EML1 and the second emission layer EML2 may have a single-layer structure of a single layer formed using a single material, a single-layer structure of a single layer formed using a plurality of different materials, or a multi-layer structure of a plurality of layers formed using a plurality of different materials.

[0150] Each of the first emission layer EML1 and the second emission layer EML2 may include anthracene derivatives, pyrene derivatives, fluoranthene derivatives, 1,2-triphenylene derivatives, dihydrobenzanthracene derivatives and / or triphenylene derivatives. In some embodiments, the first emission layer EML1 and the second emission layer EML2 may include anthracene derivatives and / or pyrene derivatives.

[0151] Each of the first emission layer EML1 and the second emission layer EML2 may be formed using various appropriate methods such as vacuum deposition, spin coating, casting, Langmuir-Brockett (LB) method, inkjet printing, laser printing, and / or laser induced thermal imaging (LITI) method.

[0152] Each of the first emission layer EML1 and the second emission layer EML2 may include a host and a dopant, and each of the first emission layer EML1 and the second emission layer EML2 may include a compound represented by Formula E-1. For example, the first blue emission layer EML-B1 and the second blue emission layer EML-B2 may include a compound represented by Formula E-1. The compound represented by the following Formula E-1 may be used as a fluorescent host material.

[0153] Formula E-1

[0154]

[0155] In formula E-1, R 31 To R 40 Each of R and R may be independently 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 of 1 to 10 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 10 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or may be combined with adjacent groups to form a ring. In some embodiments, R 31 To R 40 It may combine with adjacent groups to form a saturated hydrocarbon ring, an unsaturated hydrocarbon ring, a saturated heterocyclic ring or an unsaturated heterocyclic ring.

[0156] In Formula E-1, "c" and "d" may each independently be an integer selected from 0 to 5.

[0157] The compound represented by Formula E-1 may be represented by one of the following Compounds E1 to E20.

[0158]

[0159] In an embodiment, each of the first emission layer EML1 and the second emission layer EML2 may include a compound represented by Formula E-2a or Formula E-2b. For example, each of the first red emission layer EML-R1 and the second red emission layer EML-R2 and the first green emission layer EML-G1 and the second green emission layer EML-G2 may include a compound represented by Formula E-2a or Formula E-2b. The compound represented by Formula E-2a or Formula E-2b may be used as a phosphorescent host material.

[0160] Formula E-2a

[0161]

[0162] In Formula E-2a, "a" may be an integer selected from 0 to 10, L aIt may be a directly linked, substituted or unsubstituted arylene group of 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroarylene group of 2 to 30 ring carbon atoms. In some embodiments, if "a" is an integer of 2 or more, multiple L a Each may independently be a 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.

[0163] In addition, in formula E-2a, A 1 To A 5 Can be N or CR independently i . R a To R i Each of them 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 of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring carbon atoms, or may combine with adjacent groups to form a ring. a To R i They may combine together with adjacent groups to form a hydrocarbon ring or a heterocyclic ring including N, O, S, etc. as ring atoms.

[0164] In some embodiments, in Formula E-2a, selected from A 1 To A 5 Two or three of them may be N, and the remaining groups may be CR i .

[0165] Formula E-2b

[0166]

[0167] In Formula E-2b, Cbz1 and Cbz2 may each independently be an unsubstituted carbazolyl group or a carbazolyl group substituted with an aromatic group having 6 to 30 ring carbon atoms. b It may be a directly linked, substituted or unsubstituted arylene group of 6 to 30 ring carbon atoms or a substituted or unsubstituted heteroarylene group of 2 to 30 ring carbon atoms. "b" is an integer selected from 0 to 10, and if "b" is an integer of 2 or more, multiple L b Each may independently be a 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.

[0168] The compound represented by formula E-2a or formula E-2b can be represented by one of the compounds in the following compound group E-2. However, the compounds shown in the following compound group E-2 are only for illustration, and the compound represented by formula E-2a or formula E-2b is not limited to the compounds represented in the following compound group E-2.

[0169] Compound Group E-2

[0170]

[0171]

[0172] Each of the first emission layer EML1 and the second emission layer EML2 may further include any appropriate material commonly used as a host material in the art. In some embodiments, each of the first emission layer EML1 and the second emission layer EML2 may include bis(4-(9H-carbazol-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-carbazol-1,1'-biphenyl (CB P), 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) as a host material. However, the embodiments of the present disclosure are not limited thereto. For example, tris(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.

[0173] Each of the first emission layer EML1 and the second emission layer EML2 may include a compound represented by the following formula Ma. For example, each of the first red emission layer EML-R1 and the second red emission layer EML-R2 and the first green emission layer EML-G1 and the second green emission layer EML-G2 may include a compound represented by formula Ma. The compound represented by formula Ma may be used as a phosphorescent dopant material.

[0174] Formula Ma

[0175]

[0176] In formula Ma, Y 1 To Y 4 and Z 1 To Z 4 Can be independently CR 1 or N, and R 1 To R 4 Each of them may be independently 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 of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or may be combined with adjacent groups to form a ring. In formula Ma, "m" is 0 or 1, and "n" is 2 or 3. In formula Ma, if "m" is 0, "n" is 3, and if "m" is 1, "n" is 2.

[0177] The compound represented by the formula Ma may be used as a phosphorescent dopant.

[0178] The compound represented by formula Ma may be represented by one of the following compounds M-a1 to M-a25. However, the following compounds M-a1 to M-a25 are examples, and the compound represented by formula Ma is not limited to the compounds represented by the following compounds M-a1 to M-a25.

[0179]

[0180]

[0181] In an embodiment, the first emission layer EML1 may include a first compound including a first portion among compounds represented by formula Ma. The second emission layer EML2 may include a second compound including a second portion among compounds represented by formula Ma. In some embodiments, the first emission layer EML1 and the second emission layer EML2 may include a first compound represented by formula Ma and a second compound represented by formula Ma, respectively. The first compound represented by formula Ma and the second compound represented by formula Ma may be represented by Formula 3-1 or Formula 3-2 below.

[0182] Formula 3-1

[0183]

[0184] Formula 3-2

[0185]

[0186] In formula 3-1 and formula 3-2, Y 1 To Y 4 and Z 1 To Z 4 Can be independently CR w or N, R w and R x1 To R x6 Each of the R groups may be independently 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 of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring carbon atoms, or may be combined with adjacent groups to form a ring. In Formula 3-1 and Formula 3-2, R y1 To R y6 and R z1 To R z6 Each independently may be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, or a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms. In Formula 3-1 and Formula 3-2, m1 and m2 may each independently be 0 or 1, and n1 and n2 may each independently be 2 or 3. In Formula 3-1 and Formula 3-2, if m1 is 0, n1 may be 3, if m1 is 1, n1 may be 2, if m2 is 0, n2 may be 3, and if m2 is 1, n2 may be 2.

[0187] The first compound represented by formula Ma and the second compound represented by formula Ma may be represented by one of the compounds in compound group R or compound group G. However, the compounds shown in compound group R and compound group G are examples, and the first compound or the second compound represented by formula Ma is not limited to the compounds in compound group R or compound group G.

[0188] Compound Group R

[0189]

[0190]

[0191] Compound Group G

[0192]

[0193] Each of the first emission layer EML1 and the second emission layer EML2 may include one of the following formulas Fa to Fc. For example, the first blue emission layer EML-B1 and the second blue emission layer EML-B2 may include a compound represented by one of the following formulas Fa to Fc. The compound represented by one of the following formulas Fa to Fc may be used as a fluorescent dopant material.

[0194] Formula

[0195]

[0196] In the formula Fa, R a To R j The two of them can be independently *-NAr 1 Ar 2 Replace. a To R j Not *-NAr 1 Ar 2 The remaining substituted groups 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 of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring carbon atoms.

[0197] In *-NAr 1 Ar 2 in Ar 1 and Ar 2 and Ar may be 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. 1 and Ar 2At least one of may be a heteroaryl group including O or S as a ring-forming atom.

[0198] Formula Fb

[0199]

[0200] In formula Fb, R a and R b Each of Ar may be independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring carbon atoms, or may be combined with adjacent groups to form a ring. 1 To Ar 4 Each may 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.

[0201] In Formula Fb, U and V may each independently be a substituted or unsubstituted hydrocarbon ring of 5 to 30 ring carbon atoms or a substituted or unsubstituted heterocyclic ring of 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.

[0202] In formula Fb, the number of rings represented by U and V may be 0 or 1 independently of each other. For example, in formula Fb, if the number of U or V is 1, one ring forms a condensed ring at the portion marked by U or V, and if the number of U or V is 0, there is no ring at the portion marked by U or V. In some embodiments, if the number of U is 0 and the number of V is 1, or if 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. In some embodiments, if the numbers of U and V are both 0, the condensed ring having a fluorene core of formula Fb may be a cyclic compound having three rings. In some embodiments, if the numbers of U and V are both 1, the condensed ring having a fluorene core of formula Fb may be a cyclic compound having five rings.

[0203] Formula Fc

[0204]

[0205] In Formula Fc, A 1 and A 2 can be independently O, S, Se or NR m , and R mR 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 3 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 boron group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thiol group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring carbon atoms, or combines with adjacent groups to form a ring. Ar a and Ar b and Ar may each independently be a substituted or unsubstituted hydrocarbon ring having 6 to 30 ring carbon atoms or a substituted or unsubstituted heterocyclic ring having 2 to 30 ring carbon atoms. a and Ar b They may each independently be a substituted or unsubstituted benzene ring, a substituted or unsubstituted benzothiophene ring, or a substituted or unsubstituted benzothiazole ring.

[0206] In Formula Fc, A 1 and A 2 can each independently combine with the substituent of the adjacent ring to form a fused ring. 1 and A 2 Each independently is NR m , then A 1 Can be used with Ar a or R 1 are combined together to form a ring. In some embodiments, A 2 Can be used with Ar b or R 3 Join together to form a ring.

[0207] In an embodiment, the first emission layer EML1 may include a first compound including a first portion among the compounds represented by Formula Fc. The second emission layer EML2 may include a second compound including a second portion among the compounds represented by Formula Fc. In some embodiments, the first emission layer EML1 and the second emission layer EML2 may include a first compound represented by Formula Fc and a second compound represented by Formula Fc, respectively.

[0208] For example, in Formula Fc, A 2 Can be NR m , and R m It may be a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms including the first part or the second part. 2 Can be NRm , and R m The substituted or unsubstituted benzothiophenyl group, substituted or unsubstituted thienopyridinyl group, substituted or unsubstituted thienopyrimidinyl group, substituted or unsubstituted thienopyridazinyl group, substituted or unsubstituted thienopyrazinyl group, substituted or unsubstituted thienotriazinyl group, substituted or unsubstituted thienotetrazinyl group, substituted or unsubstituted benzothiazolyl group, substituted or unsubstituted thiazolopyridinyl group, substituted or unsubstituted thiazolopyrimidinyl group, substituted or unsubstituted thiazolopyrid ... pyridazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyridinyl, substituted or unsubstituted thiazolopyrimidinyl, substituted or unsubstituted thiazolopyridazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl and / or substituted or unsubstituted thiazolopyrazinyl. For example, R m It may be a substituted or unsubstituted benzothienyl group, a substituted or unsubstituted thienopyridyl group, a substituted or unsubstituted benzothiazolyl group, or a substituted or unsubstituted thiazolopyridyl group.

[0209] In Formula Fc, R 1 To R 3 One of the R may be a substituted or unsubstituted amine group comprising the first part or the second part. 6 The substituted or unsubstituted benzothiophenyl group may include substituted or unsubstituted thienopyridinyl group, substituted or unsubstituted thienopyrimidinyl group, substituted or unsubstituted thienopyridazinyl group, substituted or unsubstituted thienopyrazinyl group, substituted or unsubstituted thienotriazinyl group, substituted or unsubstituted thienotetrazinyl group, substituted or unsubstituted benzothiazolyl group, substituted or unsubstituted thiazolopyridinyl group, substituted or unsubstituted thiazolopyrimidinyl group, substituted or unsubstituted thiazolopyrid ... pyridazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyridinyl, substituted or unsubstituted thiazolopyrimidinyl, substituted or unsubstituted thiazolopyridazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl and / or substituted or unsubstituted thiazolopyrazinyl.

[0210] The first compound or the second compound represented by Formula Fc may be represented by one of the compounds in Compound Group B. However, the compounds shown in Compound Group B are examples, and the first compound or the second compound represented by Formula Fc is not limited to the compounds represented in Compound Group B.

[0211] Compound Group B

[0212]

[0213]

[0214]

[0215] In an embodiment, each of the first emission layer EML1 and the second emission layer EML2 may 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- As dopant materials, there are many kinds of materials, such as 2-(4-(N,N-diphenylamino)phenyl)-N-phenylaniline (N-BDAVBi) and 4,4'-bis[2-(4-(N,N-diphenylamino)phenyl)vinyl]biphenyl (DPAVBi)), perylene and its derivatives (for example, 2,5,8,11-tetra-tert-butylperylene (TBP)), pyrene and its derivatives (for example, 1,1'-dipyrene, 1,4-dipyrenylbenzene and 1,4-bis(N,N-diphenylamino)pyrene), etc.

[0216] Each of the first emission layer EML1 and the second emission layer EML2 may further include any suitable phosphorescent dopant material. For example, the phosphorescent dopant may use a metal complex including iridium (Ir), platinum (Pt), osmium (Os), gold (Au), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb) or thulium (Tm). In some embodiments, bis (4,6-difluorophenylpyridyl-N, C2') picolinyl iridium (III) (FIrpic), bis (2,4-difluorophenylpyridyl)-tetrakis (1-pyrazolyl) borate iridium (III) (FIr6) and / or octaethylporphyrin platinum (PtOEP) may be used as phosphorescent dopants. However, embodiments of the present disclosure are not limited thereto.

[0217] Each of the first emission layer EML1 and the second emission layer EML2 may include a quantum dot material. The core of the quantum dot may be selected from a group consisting of a II-VI compound, a III-VI compound, a I-III-VI compound, a III-V compound, a III-II-V compound, a IV-VI compound, a group IV element, a group IV compound, and a combination thereof.

[0218] The II-VI compounds may be selected from the group consisting of: 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, Cd ZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof; and a quaternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and mixtures thereof.

[0219] Group III-VI compounds may include: binary compounds, such as In 2 S 3 and / or In 2 Se 3 ; Ternary compounds, such as InGaS 3 and / or InGaSe 3 ; or any optional combination thereof.

[0220] The I-III-VI group compound can be selected from: ternary compounds selected from AgInS, AgInS 2 、CuInS、CuInS 2 、AgGaS 2 、CuGaS 2 、CuGaO 2 、AgGaO 2 、AgAlO 2 and mixtures thereof; and / or quaternary compounds, such as AgInGaS 2 and / or CuInGaS 2 .

[0221] The Group III-V compounds can be selected from the group consisting of: 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 GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb, and mixtures thereof; and quaternary compounds selected from the group consisting of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof. In some embodiments, the Group III-V compounds may further include Group II metals. For example, InZnP, etc. can be selected as Group III-II-V compounds.

[0222] The Group IV-VI compounds can be selected from the group consisting of: 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; and quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe, and mixtures thereof. The Group IV elements can be selected from the group consisting of Si, Ge, and mixtures thereof. The Group IV compounds can be binary compounds selected from the group consisting of SiC, SiGe, and mixtures thereof.

[0223] Each element included in a multi-component compound (such as a binary compound, a ternary compound, and a quaternary compound) can be present in the particles at a uniform concentration or a non-uniform concentration. In some embodiments, the chemical formula means the type (or species) of elements included in the compound, and the atomic ratios in the compound can be different. For example, AgInGaS 2 can mean AgIn x Ga 1-x S 2 (where x is a real number satisfying 0 < x < 1).

[0224] In some embodiments, the quantum dot may have a single structure in which the concentration of each element included in the quantum dot is uniform (or substantially uniform), or a core-shell dual structure. For example, the material included in the core and the material included in the shell may be different from each other.

[0225] The shell of the quantum dot may function as a protective layer to prevent or reduce the chemical degeneration of the core to maintain semiconductor properties and / or a charging layer for imparting electrophoretic properties to the quantum dot. The shell may have 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 element present in the shell decreases in a direction toward the center of the core.

[0226] In some embodiments, the quantum dot may have the above-mentioned core-shell structure including a core containing nanocrystals and a shell encapsulating the core. The shell of the quantum dot may act as a protective layer to prevent or reduce the chemical denaturation of the core to maintain semiconductor properties and / or a charging layer for imparting electrophoretic properties to the quantum dot. The shell may have a single layer or multiple layers. Examples of the shell of the quantum dot may include metal oxides and / or non-metal oxides, semiconductor compounds, or combinations thereof.

[0227] For example, metal and / 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 and / or NiO; and / or ternary compounds such as MgAl 2 O 4 、CoFe 2 O 4 、NiFe 2 O 4 and / or CoMn 2 O 4 , but the embodiments of the present disclosure are not limited thereto.

[0228] Also, the semiconductor compound 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 the embodiments of the present disclosure are not limited thereto.

[0229] Each element included in the polynary compound (such as binary compound, ternary compound and quaternary compound) may be present in the particle with a uniform concentration or a non-uniform concentration. As described above, in some embodiments, the chemical formula means the type (or kind) of the element included in the compound, and the atomic ratio in the compound may be different.

[0230] The quantum dots may have a full width at half maximum (FWHM) of an emission wavelength spectrum of about 45 nm or less, e.g., about 40 nm or less or about 30 nm or less. Within these ranges, color purity and / or color reproducibility may be improved. In some embodiments, light emitted by such quantum dots is emitted in all (or substantially all) directions, and light viewing angle characteristics may be improved.

[0231] In some embodiments, the shape of the quantum dot can be any suitable shape commonly used in the art, without specific limitation. In some embodiments, spherical, pyramidal, multi-armed and / or cubic nanoparticles, nanotubes, nanowires, nanofibers, nanoplates, etc. can be used.

[0232] By controlling the size of the quantum dots or by controlling the ratio of elements in the quantum dot compound, the energy band gap can be controlled, and light of various appropriate wavelength regions can be obtained from the quantum dot emission layer. Accordingly, by using quantum dots (using quantum dots with different sizes or quantum dot compounds with different element ratios), a light-emitting element that emits light of various appropriate wavelength regions can be completed. In some embodiments, the size of the quantum dots or the ratio of elements in the quantum dot compound can be controlled to emit red light, green light, and / or blue light. In some embodiments, quantum dots can be provided to combine various appropriate emission colors together to emit white light.

[0233] The first and second electron transport regions ETR1 and ETR2 may include at least one selected from a hole blocking layer (not shown), first and second electron transport layers ETL1 and ETL2, and first and second electron injection layers EIL1 and EIL2, respectively.

[0234] Each of the first electron transport region ETR1 and the second electron transport region ETR2 may have a single-layer structure of a single layer formed using a single material, a single-layer structure of a single layer formed using a plurality of different materials, or a multi-layer structure of a plurality of layers formed using a plurality of different materials.

[0235] For example, the first electron transport region ETR1 and the second electron transport region ETR2 may respectively 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, or a single-layer structure formed using an electron injection material and an electron transport material. Further, the first electron transport region ETR1 and the second electron transport region ETR2 may respectively have a single-layer structure formed using a plurality of different materials, or a structure in which the first electron transport layer ETL1 / the first electron injection layer EIL1 and / or the hole blocking layer (not shown) / the first electron transport layer ETL1 / the first electron injection layer EIL1, etc. are stacked in the order in which they are described respectively from the first emission layer EML1, and a structure in which the second electron transport layer ETL2 / the second electron injection layer EIL2 and / or the hole blocking layer (not shown) / the second electron transport layer ETL2 / the second electron injection layer EIL2, etc. are stacked in the order in which they are described respectively from the second emission layer EML2, without limitation. The thickness of each of the first electron transport region ETR1 and the second electron transport region ETR2 may be, for example, about 100 nm. to about

[0236] The first electron transport region ETR1 and the second electron transport region ETR2 may be formed using various appropriate methods such as vacuum deposition, spin coating, casting, Langmuir-Brokett (LB) method, inkjet printing, laser printing and / or laser induced thermal imaging (LITI) method.

[0237] Each of the first electron transport region ETR1 and the second electron transport region ETR2 may include a compound represented by the following Formula ET-1.

[0238] Formula ET-1

[0239]

[0240] In formula ET-1, X 1 To X 3 At least one of them is N, and the rest are CR a . R a Ar 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 Ar 3 Each of them 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.

[0241] 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 and L may be independently directly linked, substituted or unsubstituted arylene groups of 6 to 30 ring carbon atoms or substituted or unsubstituted heteroarylene groups of 2 to 30 ring carbon atoms. In some embodiments, if "a" to "c" are integers of 2 or more, then L 1 To L 3 Each may independently be a 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.

[0242] In an embodiment, the first electron transport region ETR1 may include a first compound represented by Formula ET-1 including a first portion. The second electron transport region ETR2 may include a second compound represented by Formula ET-1 including a second portion. In some embodiments, the first electron transport region ETR1 and the second electron transport region ETR2 may include a first compound represented by Formula ET-1 and a second compound represented by Formula ET-1, respectively.

[0243] In formula ET-1, Ar 1 To Ar 3 One of the two may be a substituted or unsubstituted heteroaryl group of 2 to 30 ring carbon atoms including the first or second moiety. 1 To Ar 3 One of the above may be independently substituted or unsubstituted benzothiophenyl, substituted or unsubstituted thienopyridinyl, substituted or unsubstituted thienopyrimidinyl, substituted or unsubstituted thienopyridazinyl, substituted or unsubstituted thienopyrazinyl, substituted or unsubstituted thienotriazinyl, substituted or unsubstituted thienotetrazinyl, substituted or unsubstituted benzothiazolyl, substituted or unsubstituted thiazolopyridinyl, substituted or unsubstituted thiazolopyrimidinyl, substituted or unsubstituted substituted or unsubstituted thiazolopyridazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyridinyl, substituted or unsubstituted thiazolopyrimidinyl, substituted or unsubstituted thiazolopyridazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, substituted or unsubstituted thiazolopyrazinyl, and substituted or unsubstituted thiazolopyrazinyl. For example, Ar 1 To Ar 3 One of the may each independently be a substituted or unsubstituted benzothienyl group, a substituted or unsubstituted thienopyridinyl group, a substituted or unsubstituted benzothiazolyl group or a substituted or unsubstituted thiazolopyridinyl group.

[0244] The first compound or the second compound may be represented by one of the compounds in compound group E. However, the compounds shown in compound group E are examples, and the first compound or the second compound included in the electron transport region ETR1 or ETR2 is not limited to the compounds shown in compound group E.

[0245] Compound Group E

[0246]

[0247] Each of the first electron transport region ETR1 and the second electron transport region ETR2 may include an anthracene-based compound. However, the embodiments of the present disclosure are not limited thereto, and the first electron transport region ETR1 and the second electron transport region ETR2 may 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-ylphenyl)-9,10-dinaphthothracene, 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) and / or mixtures thereof without limitation.

[0248] The first electron transport region ETR1 and the second electron transport region ETR2 may include at least one of the following compounds ET1 to ET37.

[0249]

[0250]

[0251]

[0252] In some embodiments, each of the first electron transport region ETR1 and the second electron transport region ETR2 may include a metal halide (such as LiF, NaCl, CsF, RbCl, RbI, CuI, and KI), a metal of a lanthanide element (such as Yb), and / or a co-deposited material of a metal halide and a metal of a lanthanide element. For example, the first electron transport region ETR1 may include KI:Yb, RbI:Yb, LiF:Yb, etc. as a co-deposited material. In some embodiments, the first electron transport region ETR1 may use a metal oxide (such as Li 2 O and / or BaO) and / or 8-hydroxyquinoline lithium (Liq). However, the embodiments of the present disclosure are not limited thereto. The first electron transport region ETR1 may also be formed using a mixture material of an electron transport material and an insulating organic metal salt (e.g., an electrically insulating organic metal salt). The insulating organic metal salt may be a material having an energy band gap of about 4 eV or greater. In some embodiments, the insulating organic metal salt may include, for example, a metal acetate, a metal benzoate, a metal acetoacetate, a metal acetylacetonate, and / or a metal stearate.

[0253] In addition to the aforementioned materials, each of the first electron transport region ETR1 and the second electron transport region ETR2 may 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). However, embodiments of the present disclosure are not limited thereto.

[0254] The first electron transport region ETR1 and the second electron transport region ETR2 may respectively include a 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 a 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).

[0255] If 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, the thickness of the first electron transport layer ETL1 and the second electron transport layer ETL2 may be about 100 Å. to about , for example, about to about If the thickness of the first electron transport layer ETL1 and the second electron transport layer ETL2 satisfies the above range, appropriate or satisfactory electron transport characteristics can be obtained without significantly increasing the driving voltage. If 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, the thickness of the first electron injection layer EIL1 and the second electron injection layer EIL2 may be about to about and / or about to about If the thicknesses of the first electron injection layer EIL1 and the second electron injection layer EIL2 satisfy the above range, appropriate or satisfactory electron injection characteristics may be obtained without causing a significant increase in driving voltage.

[0256] exist FIG. 3A to FIG. 3D , the elements constituting each of the first light emitting unit OL1 and the second light emitting unit OL2 are correspondingly shown, but the stacked structure of the first light emitting unit OL1 and the second light emitting unit OL2 is not limited thereto, and can be provided in various combinations according to the characteristics of the display quality required by the light emitting element ED. For example, in the light emitting element ED of another 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. In some embodiments, the second hole transport region HTR2 of the second light emitting unit OL2 may have a structure not 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 including the first emission auxiliary layers SE-R1, SE-G1, and SE-B1.

[0257] In some embodiments, the charge generation unit CGL is between the first light emitting unit OL1 and the second light emitting unit OL2. If a voltage is applied to the charge generation unit CGL, a complex may be formed by an oxidation-reduction reaction, and charges (electrons and holes) may be generated. The charge generation unit CGL may provide the generated charges to 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 play a role in controlling the charge balance between the adjacent light emitting units OL1 and OL2.

[0258] The charge generation unit CGL may include 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 combined with each other. The charge generation unit CGL may have a stacked structure of the p-type charge generation layer p-CGL and the n-type charge generation layer n-CGL in sequence.

[0259] 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. The p-type charge generation layer p-CGL may include the first compound according to an embodiment of the present disclosure as a base material, and may be a layer in which a p dopant is doped in a base material. In some embodiments, a buffer layer (not shown) may be further between the n-type charge generation layer n-CGL and the p-type charge generation layer p-CGL.

[0260] The charge generation units CGL may include an n-type aromatic amine-based material or a p-type metal oxide. For example, each of the charge generation units CGL may include a charge generation compound composed of an n-type aromatic amine-based organic compound, a metal, a metal oxide, a metal carbonate, a metal fluoride, or a mixture thereof.

[0261] For example, the n-type aromatic amine organic compound may be N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPD), 2-TNATA, TDATA, MTDATA, spiro TAD and / or spiro NPB. For example, the metal may be cesium (Cs), molybdenum (Mo), vanadium (V), titanium (Ti), tungsten (W), barium (Ba) and / or lithium (Li). In some embodiments, the metal oxide, metal carbonate and metal fluoride may include Re 2 O 7 、MoO 3 、V 2 O 5 , WO 3 、TiO 2 , Cs 2 CO 3 , BaF 2 , LiF and / or CsF.

[0262] 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 embodiments of the present disclosure are not limited thereto. For example, if the first electrode EL1 is an anode, the second electrode EL2 may be a cathode, and if the first electrode EL1 is a cathode, the second electrode EL2 may be an anode.

[0263] The second electrode EL2 may be a transmissive electrode, a transflective electrode, or a reflective electrode. If the second electrode EL2 is a transmissive electrode, the second electrode EL2 may include a transparent metal oxide, for example, ITO, IZO, ZnO, ITZO, or the like.

[0264] The second electrode EL2 is a transflective electrode or a reflective electrode, and 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 including them or a mixture thereof (for example, AgMg, AgYb and / 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 some embodiments, the second electrode EL2 may have a multilayer structure including a reflective layer or a transflective layer formed using the above materials and a transparent conductive layer formed using ITO, IZO, ZnO, ITZO, etc. For example, the second electrode EL2 may include the aforementioned metal material, a combination of two or more metal materials selected from the aforementioned metal materials, and / or an oxide of the aforementioned metal material.

[0265] In some embodiments, the second electrode EL2 may be connected to the auxiliary electrode. If the second electrode EL2 is connected to the auxiliary electrode, impedance (eg, resistance) of the second electrode EL2 may be reduced.

[0266] On the second electrode EL2 of the light emitting element ED of the embodiment, a capping layer CPL may be provided. The capping layer CPL may include a plurality of layers or a single layer.

[0267] In an embodiment, the capping layer CPL may be an organic layer and / or an inorganic layer. For example, if the capping layer CPL includes an inorganic material, the inorganic material may include an alkali metal compound (such as LiF), an alkaline earth metal compound (such as MgF 2 )、SiON、SiN x 、SiO y wait.

[0268] The capping layer CPL may include a third compound including a third portion. For example, the third compound may be an aromatic amine compound in which a substituent including the third portion is bonded to a triphenylamine group. However, the type of the third compound is not limited thereto, but may include a variety of chemical structures without limitation, as long as the third compound includes the third portion as a part of the structure.

[0269] The third part includes one of benzothiophene, thienopyridine, thienopyrimidine, thienopyridazine, thienopyrazine, thienotriazine, thienotetrazine, benzothiazole, thiazolopyridine, thiazolopyrimidine, thiazolopyridazine, thiazolopyrazine, thiazotriazine, thiazotetrazine, benzothiadiazole, thiadiazolopyridine, thiadiazolopyrimidine, thiadiazolopyridazine, thiadiazolopyrazine, thiadiazotriazine and thiadiazotetrazine.

[0270] The capping layer CPL may include the third compound represented by Formula 1.

[0271] Formula 1

[0272]

[0273] In formula 1, R 1 To R 15 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 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 15 and R and R are each independently a hydrogen atom, a deuterium atom, a substituted or unsubstituted phenyl group, a substituted or unsubstituted benzothienyl group, a substituted or unsubstituted dibenzothienyl group, a substituted or unsubstituted benzothiazolyl group, a substituted or unsubstituted benzofuranyl group, or a substituted or unsubstituted dibenzofuranyl group. 1 To R 15 One of the compounds may correspond to an amine group substituted with a substituent such as an aryl group, and the third compound represented by Formula 1 may be a diamine compound.

[0274] R 1 To R 15 At least one of may be a substituent represented by Formula 2.

[0275] Formula 2

[0276]

[0277] In formula 2, A 1 To A 6 Can be N or CR independently i , and R iIt may 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 of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms. i Can be combined with adjacent groups to form a ring. In some embodiments, R i It can be a position connected to Formula 1.

[0278] The substituent represented by Formula 2 may be a substituent represented by Formula 2-1 or Formula 2-2.

[0279] Formula 2-1

[0280]

[0281] Formula 2-2

[0282]

[0283] In formula 2-1 and formula 2-2, A 7 and A 8 Can be N or CR independently 16 .

[0284] In equation 2-1 and equation 2-2, if A 7 or A 8 CR 16 , R 16 It may be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, or a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms. 16 It may be a hydrogen atom, a deuterium atom, or a substituted or unsubstituted methyl group.

[0285] In formula 2-1 and formula 2-2, X 1 To X 8 X and X may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, or a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms. 1 To X 8 They may each independently be a hydrogen atom, a deuterium atom, or a substituted or unsubstituted methyl group.

[0286] In Formula 2-1 and Formula 2-2, "*-" may be a position for connection with Formula 1.

[0287] In an embodiment, the capping layer CPL may include a third compound represented by one of Formula 1-1 to Formula 1-4.

[0288] Formula 1-1

[0289]

[0290] Formula 1-2

[0291]

[0292] Formula 1-3

[0293]

[0294] Formula 1-4

[0295]

[0296] In Formula 1-1 to Formula 1-4, the same contents explained with respect to Formula 1 can be applied to R 1 To R 7 and R 9 To R 15 .

[0297] In formula 1-3 and formula 1-4, R a1 To R a10 and R b1 To R b10 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 aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group having 2 to 30 ring carbon atoms. a1 To R a10 and R b1 To R b10 They may each independently be a hydrogen atom, a deuterium atom, a substituted or unsubstituted phenyl group, a substituted or unsubstituted benzothienyl group, a substituted or unsubstituted dibenzothienyl group, a substituted or unsubstituted benzothiazolyl group, a substituted or unsubstituted benzofuranyl group or a substituted or unsubstituted dibenzofuranyl group.

[0298] The third compound of the embodiment may be one of the compounds represented in compound group C. The capping layer CPL of the light-emitting element ED of the embodiment may include at least one of the third compounds shown in compound group C. For example, the capping layer CPL of the light-emitting element ED may include at least one of the amine compounds shown in compound group C.

[0299] Compound Group C

[0300]

[0301]

[0302]

[0303] If the capping layer CPL further includes an organic material, the organic material may 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"-tris(N-carbazolyl)triphenylamine (TCTA), etc., and / or the organic material may include epoxy resin and / or acrylate (such as methacrylate). In some embodiments, the capping layer CPL may include at least one of the following compounds P1 to P5, but the embodiments of the present disclosure are not limited thereto.

[0304]

[0305] In some embodiments, the capping layer CPL may have a refractive index of about 1.6 or more. For example, the capping layer CPL may have a refractive index of about 1.6 or more with respect to light in a wavelength range of about 550 nm to about 660 nm.

[0306] Figure 4 FIG. 1 is a cross-sectional view schematically showing a light emitting element according to another embodiment.

[0307] and FIG. 3A to FIG. 3D different, Figure 4 The light emitting element ED is shown to include n light emitting units OL1 to OLn. In some embodiments, Figure 4 The n in refers to any integer of 3 or more.

[0308] refer to Figure 4, the light emitting element ED of 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 generating units CGL-1 to CGL-n-1 between adjacent light emitting units OL1 to OLn. The first light emitting unit OL1 to the nth light emitting unit OLn may respectively include first hole transport regions HTR1 to nth hole transport regions HTRn, first emission layers EML1 to nth emission layers EMLn, and first electron transport regions ETR1 to nth electron transport regions ETRn stacked in sequence. The first emission layers EML1 to nth emission layers EMLn may respectively include first red emission layers EML-R1 to nth red emission layers EML-Rn, first green emission layers EML-G1 to nth green emission layers EML-Gn, and first blue emission layers EML-B1 to nth blue emission layers EML-Bn. The charge generation units CGL-1 to CGL-n-1 between the adjacent light emitting cells OL1 to OLn may include p-type charge generation layers p-CGL-1 to p-CGL-n-1 and n-type charge generation layers n-CGL-1 to n-CGL-n-1, respectively.

[0309] Figure 5 It is a diagram showing a vehicle in which a display device according to an embodiment is provided.

[0310] refer to Figure 5 , the electronic device of the embodiment may include first to fourth display devices DD-1, DD-2, DD-3 and DD-4 for the vehicle AM. At least one of the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 may include the same Figure 1 The display device DD of the explained embodiment has the same configuration.

[0311] exist Figure 5 In the embodiment, the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 are shown as display devices for vehicle AM ​​in vehicle AM. However, this is an example, and the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 may be on other means of transportation (such as bicycles, motorcycles, trains, ships and / or airplanes, etc.). In some embodiments, at least one of the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 including the same configuration as the display device DD may be introduced in a personal computer, a laptop computer, a personal digital terminal, a game console, a portable electronic device, a television, a monitor and / or an external billboard, etc. In some embodiments, these are prompted as examples, and the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 may be introduced into other electronic devices as long as they do not deviate from the spirit and scope of the present disclosure.

[0312] At least one of the first to fourth display devices DD-1, DD-2, DD-3, and DD-4 may include a reference Figure 2 , FIG. 3A to FIG. 3D and Figure 4 A light emitting element ED according to the embodiment is explained.

[0313] refer to Figure 5 The vehicle AM ​​may include a steering wheel HA and a gearshift GR for operation of the vehicle AM. In some embodiments, the vehicle AM ​​may include a front window GL facing the driver.

[0314] The first display device DD-1 may be in a first area overlapping with 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 showing the driving speed of the vehicle AM, a second scale showing the number of revolutions of the engine (e.g., revolutions per minute RPM) and / or an image showing the fuel status. The first scale and the second scale may be represented by digital images.

[0315] The second display device DD-2 may be in a second zone facing the driver's seat and overlapping the front window GL. The driver's seat may be a seat in which a steering wheel HA is provided. For example, the second display device DD-2 may be a head-up display (HUD) showing 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 showing the driving speed of the vehicle AM, and may further include information containing the current time. In some embodiments, the second information of the second display device DD-2 may be projected and displayed on the front window GL.

[0316] The third display device DD-3 may be in a third zone adjacent to the gear GR. For example, the third display device DD-3 may be a center information display (CID) of the vehicle AM, between the driver's seat and the passenger seat and showing the third information. The passenger seat may be a seat separate from the driver's seat, wherein the gear GR is between the passenger seat and the driver's seat. The third information may include information about road conditions (e.g., navigation information), about playing music and / or radio, about playing dynamic images (and / or images), and / or about the temperature in the vehicle AM.

[0317] The fourth display device DD-4 may be in a fourth area separated from the steering wheel HA and the gearshift GR and adjacent to the side of the vehicle AM. For example, the fourth display device DD-4 may be a digital rearview mirror that displays the fourth information. The fourth display device DD-4 may display an external image of the vehicle AM ​​captured by a camera module CM outside the vehicle AM. The fourth information may include an external image of the vehicle AM.

[0318] The above-mentioned first to fourth information are examples, and the first to fourth display devices DD-1, DD-2, DD-3 and DD-4 may further display information on the inside and / or outside of the vehicle AM. The first to fourth information may include information different from each other. However, the embodiments of the present disclosure are not limited thereto, and part of the first to fourth information may include the same information.

[0319] Below, with FIG. 3A to FIG. 3D Referring to Examples and Comparative Examples together, the light emitting element according to the embodiment of the present disclosure will be explained in more detail. The following examples are explained to help understand the subject matter of the present disclosure, but the scope of the present disclosure is not limited thereto.

[0320] 1. Manufacturing of light-emitting components

[0321] The light-emitting elements of the embodiment and the light-emitting elements of the comparative example were manufactured by the method described below. In Table 1, whether the first part, the second part, or the third part is included in the compound used for each layer when the light-emitting elements of the embodiment and the comparative example are manufactured is shown. In Table 1, the part marked by "O" indicates that the first part, the second part, or the third part is included in the compound used for each layer, and the part not marked by any mark indicates that the first part, the second part, or the third part is excluded from the compound used for each layer.

[0322] Manufacturing of Light Emitting Element of Example 1

[0323] In order to manufacture the light-emitting element of Example 1, a 15 Ω / cm 2 of The glass substrate was cut into a size of 50 mm×50 mm×0.7 mm, cleaned using ultrasonic waves and using isopropyl alcohol and ultrapure water for about 5 minutes each, exposed to UV for about 30 minutes, and cleaned by exposure to ozone, and then, the glass substrate was mounted in a vacuum deposition apparatus.

[0324] On the first electrode, a first light emitting unit was formed. Specifically, on the first electrode, compound H-1-1 of compound group H doped with F4-TCNQ (2 wt %) was deposited to about 30 nm to form a first hole transport layer as a common layer. Then, on the first hole transport layer, a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound R1 in compound group R (2wt%, R zone) at a weight ratio of about 1:1 is deposited to about 40nm to form a first red emission layer overlapping the first light-emitting zone, a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound G1 in compound group G (8wt%, G zone) at a weight ratio of about 1:1 is deposited to about 30nm to form a first green emission layer overlapping the second light-emitting zone, and a main body of compound E20 doped with a dopant of compound B1 in compound group B (2wt%, B zone) is deposited to about 30nm to form a first blue emission layer overlapping the third light-emitting zone, thereby forming a first emission layer as a pattern layer. Then, compound ET37 is deposited to about 10nm to form a first electron transport layer as a common layer.

[0325] Afterwards, a charge generation unit was formed on the first electron transport layer. Specifically, 4,7-diphenyl-1,10-phenanthroline (Bphen) doped with Li (1 wt%) was formed to about 10 nm, and compound H-1-1 in compound group H doped with F4-TCNQ (5 wt%) was deposited to about 10 nm to form a charge generation unit as a common layer.

[0326] Afterwards, a second light-emitting unit is formed on the charge generation unit. Specifically, on the charge generation unit, compound H-1-1 in compound group H is deposited to about 30 nm to form a second hole transport layer as a common layer. Then, on the second hole transport layer, compound H-1-2 in compound group H is deposited to about 10 nm to form a second red emission auxiliary layer overlapping the first light-emitting area, on the second hole transport layer, compound H-1-2 in compound group H is deposited to about 10 nm to form a second green emission auxiliary layer overlapping the second light-emitting area, and on the second hole transport layer, compound H-1-2 in compound group H is deposited to about 10 nm to form a second blue emission auxiliary layer overlapping the third light-emitting area, thereby forming a second emission auxiliary layer as a pattern layer. Afterwards, on the second emission auxiliary layer, a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound R1 in compound group R (2wt%, R zone) at a weight ratio of about 1:1 is deposited to about 40nm to form a second red emission layer overlapping the first light-emitting zone, and on the second emission auxiliary layer, a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound G1 in compound group G (8wt%, G zone) at a weight ratio of about 1:1 is deposited to about 30nm to form a second green emission layer overlapping the second light-emitting zone, and on the second emission auxiliary layer, a main body of compound E20 doped with a dopant of compound B1 in compound group B (2wt%, B zone) is deposited to about 30nm to form a second blue emission layer overlapping the third light-emitting zone, thereby forming a second emission layer as a pattern layer. Then, compound ET37 is deposited to about 10nm to form a second electron transport layer as a common layer.

[0327] Then, Mg:Ag (10 wt%) was deposited on the second light emitting unit to form a A second electrode with a thickness of . Then, on the second electrode, compound 1 in compound group C was deposited to about 60 nm to form a capping layer as a common layer, thereby manufacturing a light-emitting element. All layers were formed by vacuum deposition.

[0328] Manufacturing of Light Emitting Element of Example 2

[0329] The light emitting element of Example 2 was manufactured to have the same stack structure as that of the light emitting element of Example 1. Compared with the light emitting element of Example 1, the light emitting element of Example 2 was manufactured by the same method except that a different compound was used to form the second emission assisting layer.

[0330] In the light-emitting element of Example 2, compound HT1 in compound group HT is deposited to about 5 nm to form a second red emission auxiliary layer overlapping the first light-emitting zone, compound HT1 in compound group HT is deposited to about 5 nm to form a second green emission auxiliary layer overlapping the second light-emitting zone, and compound HT9 in compound group HT is deposited to about 5 nm to form a second blue emission auxiliary layer overlapping the third light-emitting zone.

[0331] Manufacturing of Light Emitting Element of Example 3

[0332] The light-emitting element of Example 3 is manufactured to have the same stacking structure as the light-emitting element of Example 1. Compared with the light-emitting element of Example 1, the light-emitting element of Example 3 is manufactured by the same method except that different compounds are used to form the first emission layer, the first electron transport layer, the second emission layer, and the second electron transport layer.

[0333] The first red emission layer and the second red emission layer of the light-emitting element of Example 3 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound M-a9 (2wt%, R region) at a weight ratio of about 1:1 to about 40nm. The first green emission layer and the second green emission layer of the light-emitting element of Example 3 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound M-a13 (8wt%, G region) at a weight ratio of about 1:1 to about 30nm. The first blue emission layer and the second blue emission layer of the light-emitting element of Example 3 are formed by depositing a main body of compound E20 doped with a dopant of compound BD (2wt%, B region) to about 30nm. The first electron transport layer and the second electron transport layer of the light-emitting element of Example 3 are formed by depositing compound E1 in compound group E to about 10nm.

[0334] Manufacturing of Light Emitting Element of Example 4

[0335] The light-emitting element of Example 4 was manufactured to have the same stack structure as that of the light-emitting element of Example 1. Compared with the light-emitting element of Example 1, the light-emitting element of Example 4 was manufactured by the same method except that a different compound was used to form the first electron transport layer.

[0336] The first electron transport layer of the light-emitting element of Example 4 was formed by depositing Compound E1 in Compound Group E to about 10 nm.

[0337] Manufacturing of Light Emitting Element of Example 5

[0338] Compared with the stacked structure of the light-emitting element of Example 1, the light-emitting element of Example 5 is manufactured to have the same structure as the light-emitting element of Example 1, except that the first light-emitting unit includes a first emission auxiliary layer. Compared with the light-emitting element of Example 1, the light-emitting element of Example 5 is manufactured by the same method, except that different compounds are used to form the first emission layer, the second emission layer, the second electron transport layer and the capping layer.

[0339] The first emission auxiliary layer included in the light-emitting element of Example 5 is formed on the first hole transport layer by depositing compound HT1 in compound group HT to about 5 nm to form a first red emission auxiliary layer overlapping the first light-emitting zone, depositing compound HT1 in compound group HT to about 5 nm to form a first green emission auxiliary layer overlapping the second light-emitting zone, and depositing compound HT9 in compound group HT to about 5 nm to form a first blue emission auxiliary layer overlapping the third light-emitting zone.

[0340] The first red emission layer and the second red emission layer of the light-emitting element of Example 5 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound M-a9 (2wt%, R region) at a weight ratio of about 1:1 to about 40nm. The first green emission layer and the second green emission layer of the light-emitting element of Example 5 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound M-a13 (8wt%, G region) at a weight ratio of about 1:1 to about 30nm. The first blue emission layer and the second blue emission layer of the light-emitting element of Example 5 are formed by depositing a main body of compound E20 doped with a dopant of compound BD (2wt%, B region) to about 30nm. The second electron transport layer of the light-emitting element of Example 5 is formed by depositing compound E1 in compound group E to about 10nm. The capping layer of the light-emitting element of Example 5 is formed by depositing compound 46 in compound group C to about 60nm.

[0341] Manufacturing of Light Emitting Element of Example 6

[0342] The light emitting element of Example 6 was manufactured to have the same stacked structure as that of Example 1. Compared with the light emitting element of Example 1, the light emitting element of Example 6 was manufactured by the same method except that different compounds were used to form the first emission layer, the second emission layer and the capping layer.

[0343] The first red emission layer and the second red emission layer of the light-emitting element of Example 6 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with compound R18 in compound group R (2wt%, R zone) at a weight ratio of about 1:1 to about 40nm. The first green emission layer and the second green emission layer of the light-emitting element of Example 6 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with compound G9 in compound group G (8wt%, G zone) at a weight ratio of about 1:1 to about 30nm. The first blue emission layer and the second blue emission layer of the light-emitting element of Example 6 are formed by depositing a main body of compound E20 doped with compound B46 in compound group B (2wt%, B zone) to about 30nm. The capping layer of the light-emitting element of Example 6 is formed by depositing compound 46 in compound group C to about 60nm.

[0344] Manufacturing of Light-Emitting Element of Example 7

[0345] The light emitting element of Example 7 was manufactured to have the same stack structure as that of Example 1. Compared with the light emitting element of Example 1, the light emitting element of Example 7 was manufactured by the same method except that different compounds were used to form the second emission layer and the capping layer.

[0346] The second red emission layer of the light-emitting element of Example 7 is formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound R18 in compound group R (2wt%, R zone) at a weight ratio of about 1:1 to about 40nm. The second green emission layer of the light-emitting element of Example 7 is formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound G9 in compound group G (8wt%, G zone) at a weight ratio of about 1:1 to about 30nm. The second blue emission layer of the light-emitting element of Example 7 is formed by depositing a main body of compound E20 doped with compound B46 in compound group B (2wt%, B zone) to about 30nm. The capping layer of the light-emitting element of Example 7 is formed by depositing compound 46 in compound group C to about 60nm.

[0347] Manufacturing of Light-Emitting Element of Example 8

[0348] Compared with the stacked structure of the light-emitting element of Example 1, the light-emitting element of Example 8 is manufactured to have a substantially same structure, except that the first light-emitting unit includes a first emission-assisting layer. Compared with the light-emitting element of Example 1, the light-emitting element of Example 8 is manufactured by the same method, except that different compounds are used to form the second emission-assisting layer and the second emission layer.

[0349] The first emission auxiliary layer included in the light-emitting element of Example 8 is obtained by forming a first red emission auxiliary layer, a first green emission auxiliary layer and a first blue emission auxiliary layer on the first hole transport layer, the first red emission auxiliary layer is obtained by depositing compound HT1 in the compound group HT to about 5 nm so as to overlap with the first light-emitting zone, the first green emission auxiliary layer is obtained by depositing compound HT1 in the compound group HT to about 5 nm so as to overlap with the second light-emitting zone, and the first blue emission auxiliary layer is obtained by depositing compound HT9 in the compound group HT to about 5 nm so as to overlap with the third light-emitting zone.

[0350] The second red emission layer of the light-emitting element of Example 8 is formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound R18 (2 wt%, R region) in compound group R at a weight ratio of about 1:1 to about 40 nm. The second green emission layer of the light-emitting element of Example 8 is formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound G9 (8 wt%, G region) in compound group G at a weight ratio of about 1:1 to about 30 nm. The second blue emission layer of the light-emitting element of Example 8 is formed by depositing a main body of compound E20 doped with a dopant of compound B46 (2 wt%, B region) in compound group B to about 30 nm.

[0351] In the light-emitting element of Example 8, a second red light-emitting auxiliary layer is formed by depositing compound HT18 in compound group HT to about 5 nm so as to overlap with the first light-emitting area, a second green light-emitting auxiliary layer is formed by depositing compound HT18 in compound group HT to about 5 nm so as to overlap with the second light-emitting area, and a second blue light-emitting auxiliary layer is formed by depositing compound HT9 in compound group HT to about 5 nm so as to overlap with the third light-emitting area.

[0352] Manufacturing of Light Emitting Element of Comparative Example 1

[0353] The light emitting element of Comparative Example 1 was manufactured to have the same stacked structure as that of Example 1. Compared with the light emitting element of Example 1, the light emitting element of Comparative Example 1 was manufactured by the same method except that different compounds were used to form the first emission layer, the second emission layer and the capping layer.

[0354] The first red emission layer and the second red emission layer of the light-emitting element of Comparative Example 1 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound M-a9 (2wt%, R region) at a weight ratio of about 1:1 to about 40nm. The first green emission layer and the second green emission layer of the light-emitting element of Comparative Example 1 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound M-a13 (8wt%, G region) at a weight ratio of about 1:1 to about 30nm. The first blue emission layer and the second blue emission layer of the light-emitting element of Comparative Example 1 are formed by depositing a main body of compound E20 doped with a dopant of compound BD (2wt%, B region) to about 30nm. The capping layer of the light-emitting element of Comparative Example 1 is formed by depositing compound P4 to about 60nm.

[0355] Manufacturing of Light Emitting Element of Comparative Example 2

[0356] The light emitting element of Comparative Example 2 was manufactured to have the same stack structure as that of Example 1. Compared with the light emitting element of Example 1, the light emitting element of Comparative Example 2 was manufactured by the same method except that different compounds were used to form the first emission layer and the second emission layer.

[0357] The first red emission layer and the second red emission layer of the light-emitting element of Comparative Example 2 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound M-a9 (2wt%, R region) at a weight ratio of about 1:1 to about 40nm. The first green emission layer and the second green emission layer of the light-emitting element of Comparative Example 2 are formed by depositing a main mixture of compound E-2-25 and compound E-2-26 in compound group E-2 doped with a dopant of compound M-a13 (8wt%, G region) at a weight ratio of about 1:1 to about 30nm. The first blue emission layer and the second blue emission layer of the light-emitting element of Comparative Example 2 are formed by depositing a main body of compound E20 doped with a dopant of compound BD (2wt%, B region) to about 30nm.

[0358] Manufacturing of Light Emitting Element of Comparative Example 3

[0359] The light emitting element of Comparative Example 3 was manufactured to have the same stack structure as that of the light emitting element of Example 1. Compared with the light emitting element of Example 1, the light emitting element of Comparative Example 3 was manufactured by the same method except that a different compound was used to form the capping layer.

[0360] The capping layer of the light-emitting element of Comparative Example 3 was formed by depositing the compound P4 to a thickness of about 60 nm.

[0361] The compounds used for producing the light-emitting elements of Examples and Comparative Examples are shown below. The materials used for producing the elements include the above-mentioned compounds, or include commercial products that have been purified and sublimated in advance.

[0362] Compounds used in Examples and Comparative Examples

[0363]

[0364]

[0365] Table 1

[0366]

[0367] Referring to Table 1, the light-emitting elements according to Examples 1 to 8 include the first compound, the second compound, and the third compound in each of the first light-emitting unit, the second light-emitting unit, and the capping layer. In contrast, the light-emitting element of the comparative example does not include the first compound, the second compound, and the third compound in at least one of the first light-emitting unit, the second light-emitting unit, and the capping layer.

[0368] 3. Evaluation of the properties of light-emitting components

[0369] The element efficiency (luminous efficiency) and element life of the light-emitting elements of the embodiments and comparative examples were evaluated. In Table 2, the evaluation results of the light-emitting elements of the embodiments and comparative examples are shown. In order to evaluate the properties of the light-emitting elements manufactured in Examples 1 to 8 and Comparative Examples 1 to 3, the highest luminous efficiency (Cd / A / y) relative to blue light, green light and red light was measured using a luminometer PR650, the time consumed to reduce the initial brightness to 95% of the brightness relative to blue light, green light and red light was measured as the element life, and the relative life (T95) of the light-emitting element based on Comparative Example 1 was calculated. The results are shown in Table 2. At the same time, in the evaluation of the light-emitting element, blue light uses light in a wavelength region of about 460nm as an illustration, green light uses light in a wavelength region of about 530nm as an illustration, and red light uses light in a wavelength region of about 620nm as an illustration.

[0370] Table 2

[0371]

[0372] Referring to the results of Table 2, it was confirmed that the light-emitting element of the example of the present disclosure showed improved luminous efficiency and element life with respect to blue light, green light, and red light, compared with the light-emitting element of the comparative example compound.

[0373] Referring to Table 1 and Table 2, the case of the light-emitting element of the embodiment includes the first compound, the second compound and the third compound in each of the first light-emitting unit, the second light-emitting unit and the capping layer. Since the light-emitting element of the embodiment includes a benzothiophene part or a thienopyridine part in each of the first light-emitting unit, the second light-emitting unit and the capping layer, the effect of improving the luminous efficiency can be achieved. In addition, high element efficiency and long element life can be achieved.

[0374] In Comparative Example 1, the first compound, the second compound, and the third compound are not included in each of the first light-emitting unit, the second light-emitting unit, and the capping layer, respectively. Accordingly, it is considered that the light-emitting element of Comparative Example 1 has a worse element life and low luminous efficiency relative to blue light, green light, and red light, as opposed to the embodiment.

[0375] Comparative Example 2 includes the third compound in the capping layer, but does not include the first compound and the second compound in the first light-emitting unit and the second light-emitting unit, respectively. Because Comparative Example 2 does not include the first compound and the second compound in the first light-emitting unit and the second light-emitting unit, respectively, it is considered that the light-emitting element of Comparative Example 2 has a worse element life and low luminous efficiency with respect to blue light, green light, and red light, contrary to the embodiment.

[0376] Comparative Example 3 includes the first compound and the second compound in the first light-emitting unit and the second light-emitting unit, respectively, but does not include the third compound in the capping layer. Because Comparative Example 3 does not include the third compound in the capping layer, it is considered that the light-emitting element of Comparative Example 3 has a worse element life and low luminous efficiency relative to blue light, green light, and red light, contrary to the embodiment.

[0377] According to an embodiment of the present disclosure, a tandem light-emitting element including a plurality of light-emitting stacks includes a first compound, a second compound, and a third compound, and accordingly, luminous efficiency may be maximized or increased, and luminous efficiency and element life of the light-emitting element may be improved.

[0378] Although example embodiments of the present disclosure have been described, it should be understood that the present disclosure should not be limited to those embodiments, but one of ordinary skill in the art may make various changes and modifications within the spirit and scope of the present disclosure as hereinafter claimed.

Claims

1. A light emitting element, comprising: a first electrode; a first light emitting unit on the first electrode and comprising a first emission layer; a charge generating unit on the first light emitting unit; a second light emitting unit on the charge generation unit and comprising a second emission layer; a second electrode on the second light emitting unit; as well as a capping layer on the second electrode, in: The first light-emitting unit includes a first compound including a first part, The second light-emitting unit includes a second compound including a second portion, The capping layer includes a third compound including a third portion, and The first part, the second part and the third part each independently include one of benzothiophene, thienopyridine, thienopyrimidine, thienopyridazine, thienopyrazine, thienotriazine, thienotetrazine, benzothiazole, thiazolopyridine, thiazolopyrimidine, thiazolopyridazine, thiazolopyrazine, thiazotriazine, thiazotetrazine, benzothiadiazole, thiadiazopyridine, thiadiazopyrimidine, thiadiazopyridazine, thiadiazopyrazine, thiadiazotriazine and thiadiazotetrazine. 2 . The light-emitting element according to claim 1 , wherein the first portion, the second portion, and the third portion each independently include one of benzothiophene, thienopyridine, benzothiazole, and thiazolopyridine.

3. The light-emitting element according to claim 1, wherein the capping layer comprises the third compound represented by the following formula 1: Formula 1 In formula 1, R1 to R 15 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, 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 R1 to R 15 At least one of them is a substituent represented by the following formula 2: Formula 2 In formula 2, A1 to A6 are each independently CR i or N, and R i It is a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring-forming carbon atoms, or combines with adjacent groups to form a ring.

4. The light-emitting element according to claim 1, wherein the capping layer comprises at least one of the compounds in the following compound group C: Compound Group C 5. The light emitting element according to claim 1, wherein: The first emission layer includes a first light-emitting host and a first light-emitting dopant doped in the first light-emitting host and including the first compound, and The second emission layer includes a second light-emitting host and a second light-emitting dopant doped in the second light-emitting host and including the second compound.

6. The light emitting element according to claim 1, wherein: The first emission layer includes a first red emission layer that emits red light, a first green emission layer that emits green light, and a first blue emission layer that emits blue light. The second emission layer includes a second red emission layer that emits red light, a second green emission layer that emits green light, and a second blue emission layer that emits blue light. At least one of the first red emission layer, the first green emission layer, and the first blue emission layer includes the first compound, and At least one of the second red emission layer, the second green emission layer, and the second blue emission layer includes the second compound.

7. The light emitting element according to claim 6, wherein: The first red emission layer, the first green emission layer, and the first blue emission layer are separated from each other on a plane, and The second red emission layer, the second green emission layer, and the second blue emission layer are separated from each other on a plane.

8. The light emitting element according to claim 6, wherein: The first red emission layer includes a first red light emitting body and a first red light emitting dopant doped in the first red light emitting body. The second red emission layer includes a second red light emitting body and a second red light emitting dopant doped in the second red light emitting body. The first green emission layer includes a first green light-emitting host and a first green light-emitting dopant doped in the first green light-emitting host. The second green emission layer includes a second green light emitting host and a second green light emitting dopant doped in the second green light emitting host. At least one of the first red light-emitting dopant and the first green light-emitting dopant includes the first compound, and At least one of the second red light-emitting dopant and the second green light-emitting dopant includes the second compound. 9 . The light-emitting element according to claim 8 , wherein the first red light-emitting dopant, the second red light-emitting dopant, the first green light-emitting dopant, and the second green light-emitting dopant are phosphorescent dopants.

10. The light emitting element according to claim 8, wherein: At least one of the first red light-emitting dopant and the first green light-emitting dopant is represented by the following formula 3-1 or formula 3-2, and At least one of the second red light-emitting dopant and the second green light-emitting dopant is represented by the following formula 3-1 or formula 3-2: Formula 3-1 Formula 3-2 In formula 3-1 and formula 3-2, Y1 to Y4 and Z1 to Z4 are each independently CR w or N, R w and R x1 To R x6 Each is independently 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 of 1 to 20 carbon atoms, a substituted or unsubstituted alkenyl group of 2 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 ring carbon atoms, or a substituted or unsubstituted heteroaryl group of 2 to 30 ring carbon atoms, or combines with adjacent groups to form a ring, R y1 To R y6 and R z1 To R z6 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, or a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, m1 and m2 are each independently 0 or 1, and n1 and n2 are each independently 2 or 3, Among them, if m1 is 0, then n1 is 3, if m1 is 1, then n1 is 2, if m2 is 0, then n2 is 3, and if m2 is 1, then n2 is 2.

11. The light emitting element according to claim 8, wherein: At least one of the first red light-emitting dopant and the first green light-emitting dopant includes at least one of the compounds in the following compound group R, and At least one of the second red light-emitting dopant and the second green light-emitting dopant includes at least one of the compounds in the following compound group R: Compound Group R 12. The light emitting element according to claim 6, wherein: The first blue emission layer includes a first blue light emitting host and a first blue light emitting dopant doped in the first blue light emitting host. The second blue emission layer includes a second blue light emitting host and a second blue light emitting dopant doped in the second blue light emitting host, and At least one of the first blue light-emitting dopant and the second blue light-emitting dopant includes at least one of the compounds in the following compound group B: Compound Group B 13 . The light-emitting element according to claim 12 , wherein the first blue light-emitting dopant and the second blue light-emitting dopant are fluorescent dopants.

14. The light emitting element according to claim 1, wherein: The first light emitting unit further includes a first hole transport region between the first electrode and the first emission layer and a first electron transport region between the first emission layer and the charge generating unit, and The second light emitting unit further includes a second hole transport region between the charge generating unit and the second emission layer and a second electron transport region between the second emission layer and the second electrode.

15. The light emitting element according to claim 14, wherein: At least one of the first hole transport region, the first emission layer, and the first electron transport region includes the first compound, and At least one of the second hole transport region, the second emission layer, and the second electron transport region includes the second compound.

16. The light-emitting element according to claim 14, wherein at least one of the first hole transport region and the second hole transport region comprises at least one of the compounds in the following compound group HT: Compound Group HT 17. The light-emitting element according to claim 14, wherein at least one of the first electron transport region and the second electron transport region comprises at least one of the compounds in the following compound group E: Compound Group E 18. The light emitting element according to claim 14, wherein: Each of the first hole transport region and the second hole transport region includes a hole transport layer, a hole injection layer, and an emission auxiliary layer stacked in sequence from the first electrode.

19. The light emitting element according to claim 14, wherein: The light emitting element includes a first light emitting area emitting red light, a second light emitting area emitting green light, and a third light emitting area emitting blue light, and The first hole transport region, the first electron transport region, the second hole transport region, the second electron transport region, and the second electrode are each provided as a common layer in the first light emitting region, the second light emitting region, and the third light emitting region.

20. A display device, comprising: basal layer; a circuit layer on the base layer; as well as A display device layer is on the circuit layer and includes the light emitting element according to any one of claims 1 to 19.

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