Organic light emitting device and composition for organic material layer

Abstract

The present specification relates to: a composition for an organic material layer of an organic light-emitting device, the composition comprising a heterocyclic compound of chemical formula 1 and a heterocyclic compound of chemical formula 2; and an organic light-emitting device comprising one or more organic material layers formed from the composition for an organic material layer.

Description

Composition for organic light-emitting diodes and organic layers

[0001] This specification relates to an organic light-emitting device and a composition for an organic layer.

[0002] Electroluminescent devices are a type of self-emissive display device that has the advantages of a wide viewing angle, excellent contrast, and fast response speed.

[0003] An organic light-emitting diode has a structure in which an organic thin film is placed between two electrodes. When voltage is applied to an organic light-emitting diode with such a structure, electrons and holes injected from the two electrodes combine in the organic thin film to form pairs and then annihilate, emitting light. The organic thin film can be composed of a single layer or multiple layers as needed.

[0004] The materials of organic thin films may possess luminescence capabilities as needed. For example, compounds capable of independently constituting an emissive layer may be used as organic thin film materials, or compounds capable of acting as a host or dopant in a host-dopant emissive layer may be used. Furthermore, compounds capable of performing functions such as hole injection, hole transport, electron blocking, and electron injection may also be used as organic thin film materials.

[0005] To improve the performance, lifespan, or efficiency of organic light-emitting diodes, the development of organic thin film materials is continuously required.

[0006] <Prior Art Literature>

[0007] U.S. Patent No. 4,356,429

[0008] The present application relates to an organic light-emitting device and a composition for an organic layer.

[0009] One embodiment of the present application is an organic light-emitting device comprising a first electrode, a second electrode, and one or more organic layers provided between the first electrode and the second electrode, wherein

[0010] An organic light-emitting device is provided in which at least one layer among the above organic layers comprises a heterocyclic compound represented by the following chemical formula 1 and a heterocyclic compound represented by the following chemical formula 2.

[0011] [Chemical Formula 1]

[0012]

[0013] [Chemical Formula 2]

[0014]

[0015] In the above chemical formulas 1 and 2,

[0016] X is O; S; or CRaRb; and,

[0017] L is a directly bonded; or a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, and

[0018] l is an integer from 1 to 3, and if l is 2 or greater, L are equal to or different from each other, and

[0019] A is an aryl ring having 6 to 60 carbon atoms substituted or unsubstituted with deuterium; or a heterocyclic ring having 2 to 60 carbon atoms substituted or unsubstituted with deuterium, and

[0020] Ra, Rb, Rd, Ar1, Ar3, and Ar4 are each independently hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, and

[0021] Ar2 is a substituted or unsubstituted aryl group having 10 to 60 carbon atoms; or a heteroaryl group having 2 to 60 carbon atoms, and

[0022] a is an integer from 0 to 4, and if a is 2 or greater, Rd are equal or different, and

[0023] H is hydrogen, D is deuterium, and,

[0024] d is an integer from 1 to 6, and

[0025] The above chemical formula 1 is represented by the following structural formulas A to C, and

[0026] [Structural Formula A]

[0027]

[0028] [Structural Formula B]

[0029]

[0030] [Structural Formula C]

[0031]

[0032] In the above structural formulas A to C,

[0033] refers to the positions where they combine with each other,

[0034] The deuterium content of the above structural formula B is 50% or more and 100% or less, and

[0035] R1 to R9 are the same or different from one another and each independently hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; substituted or unsubstituted alkenyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkynyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkoxy group having 1 to 60 carbon atoms; substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; substituted or unsubstituted aryl group having 6 to 60 carbon atoms; substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms; substituted or unsubstituted phosphine oxide group; Selected from the group consisting of substituted or unsubstituted amine groups, or two or more adjacent groups combine to form a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 60 carbon atoms or a substituted or unsubstituted heterocyclic ring having 2 to 60 carbon atoms, d1 is an integer from 0 to 2, and when d1 is an integer of 2, R9 are the same or different from each other, and

[0036] L1 and L2 are the same or different from each other and each independently, directly bonded; a substituted or unsubstituted arylene group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroarylene group having 2 to 60 carbon atoms; and

[0037] m and n are integers from 0 to 4, and

[0038] p and q are integers from 1 to 6, and

[0039] If m, n, p, and q are 2 or more, the substituents within the parentheses are the same or different from each other, and

[0040] The deuterium content of the above chemical formula 2 is 5% or more and 100% or less.

[0041] In addition, another embodiment of the present application provides a composition for an organic layer of an organic light-emitting device comprising a heterocyclic compound represented by Formula 1 and a heterocyclic compound represented by Formula 2.

[0042] Finally, one embodiment of the present application provides a method for manufacturing an organic light-emitting device comprising the steps of: preparing a substrate; forming a first electrode on the substrate; forming one or more organic layers on the first electrode; and forming a second electrode on the organic layers, wherein the step of forming the organic layers includes forming one or more organic layers using the aforementioned composition for organic layers.

[0043] A heterocyclic compound according to one embodiment of the present application can be used as an organic layer material for an organic light-emitting device. The heterocyclic compound can be used as a material for a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, a charge generation layer, etc., in an organic light-emitting device. In particular, the heterocyclic compound represented by Chemical Formula 1 and the compound represented by Chemical Formula 2 can be simultaneously used as a material for the light-emitting layer of an organic light-emitting device. Furthermore, when the heterocyclic compound represented by Chemical Formula 1 and the heterocyclic compound represented by Chemical Formula 2 are used in an organic light-emitting device, the driving voltage of the device can be lowered, the light efficiency can be improved, and the lifespan characteristics of the device can be improved due to the thermal stability of the compounds.

[0044] In particular, the heterocyclic compound of Chemical Formula 1 above is characterized by necessarily including deuterium at the position of Structural Formula B and having Ar2 among the substituents of triazine substituted with a specific substituent. Accordingly, when used as a material for the light-emitting layer of an organic light-emitting device, it reduces changes in vibration frequency to increase molecular stability and increases thermal stability due to high single bond dissociation energy, thereby providing excellent performance in terms of driving voltage, luminous efficiency, and lifespan. Furthermore, device characteristics can be further improved through the use in combination with Chemical Formula 2.

[0045] Specifically, by necessarily substituting structural formula B, which acts as the HOMO of the above chemical formula 1, with deuterium, oxidation stability is increased and degradation during charge injection is reduced. In addition, if Ar2 among the triazine substituents of the above chemical formula 1 is substituted with a specific substituent as in the present invention, the number of resonating charges within the molecule is increased, and electrons can move efficiently through the expanded LUMO. Accordingly, the effect of lowering the driving voltage and increasing the luminescence efficiency can be obtained.

[0046] Unlike biscarbazole-based compounds, Chemical Formula 2 according to the present application is a compound with a shallow HOMO, a small energy barrier for hole injection, and a very fast hole mobility. By fabricating a device by combining Chemical Formula 2, which has these characteristics, with Chemical Formula 1, which has a fast electron injection rate, luminous efficiency can be maximized and the capacitance can be improved, thereby resolving color expression problems that occur during screen switching in high refresh rate displays.

[0047] FIGS. 1 to 3 are schematic diagrams illustrating the stacked structure of an organic light-emitting device according to one embodiment of the present application.

[0048] <Explanation of Symbols>

[0049] 100: Substrate

[0050] 200: Anode

[0051] 300: Organic layer

[0052] 301: Hole injection layer

[0053] 302: Precision Transport Layer

[0054] 303: Emissive layer

[0055] 304: Main barrier layer

[0056] 305: Electron transport layer

[0057] 306: Electron injection layer

[0058] 400: Cathode

[0059] The present specification will be described in more detail below.

[0060] In this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0061] In this specification, of the chemical formula means the position where it is combined.

[0062] In this specification, n of Cn means the number of carbon atoms. That is, for example, C6 to C60 means 6 to 60 carbon atoms.

[0063] In this specification, the term "substitution" means that a hydrogen atom bonded to a carbon atom of a compound is replaced with another substituent, and the substitution location is not limited to the location where the hydrogen atom is substituted, that is, any location where a substituent can be substituted, and in the case of two or more substitutions, the two or more substituents may be the same or different from each other.

[0064] In this specification, "substituted or unsubstituted" means deuterium; halogen group; -CN; C1 to C60 alkyl group; C2 to C60 alkenyl group; C2 to C60 alkynyl group; C1 to C60 haloalkyl group; C1 to C60 alkoxy group; C6 to C60 aryloxy group; C1 to C60 alkylthioxy group; C6 to C60 arylthioxy group; C1 to C60 alkyl sulfoxy group; C6 to C60 aryl sulfoxy group; C3 to C60 cycloalkyl group; C2 to C60 heterocycloalkyl group; C6 to C60 aryl group; C2 to C60 heteroaryl group; It means that one or more substituents selected from the group consisting of -SiRR'R"; -P(=O)RR'; and -NRR', or two or more substituents selected from the substituents exemplified above are connected to a substituent, and R, R' and R" are each independently substituents consisting of at least one of hydrogen; deuterium; halogen group; alkyl group; alkenyl group; alkoxy group; cycloalkyl group; heterocycloalkyl group; aryl group; and heteroaryl group.

[0065] In one embodiment of the present application, deuterium is one of the isotopes of hydrogen, an element having a deuteron as its nucleus, consisting of one proton and one neutron, and can be represented as hydrogen-2, and its element symbol is D or 2 It can also be written as H.

[0066] In one embodiment of the present application, an isotope, which means an atom having the same atomic number (Z) but different mass number (A), can also be interpreted as an element having the same number of protons but different number of neutrons.

[0067] In one embodiment of the present application, the meaning of the content T% of a specific substituent can be defined as T2 / T1Y100 = T% when the total number of substituents that a basic compound may have is defined as T1 and the number of specific substituents among them is defined as T2.

[0068] That is, in one example, A deuterium content of 20% in a phenyl group represented by can be expressed as 20% when the total number of substituents that the phenyl group can have is 5 (T1 in the formula) and the number of deuteriums among them is 1 (T2 in the formula). That is, a deuterium content of 20% in a phenyl group can be represented by the following structural formula.

[0069]

[0070] In addition, in one embodiment of the present application, "phenyl group having 0% deuterium content" may mean a phenyl group that does not contain deuterium atoms, i.e., has five hydrogen atoms.

[0071] In this specification, the halogen may be fluorine, chlorine, bromine, or iodine.

[0072] In the present specification, the alkyl group comprises a straight or branched chain having 1 to 60 carbon atoms and may be further substituted by other substituents. The number of carbon atoms of the alkyl group may be 1 to 60, specifically 1 to 40, more specifically 1 to 20. Specific examples include methyl group, ethyl group, propyl group, n-propyl group, isopropyl group, butyl group, n-butyl group, isobutyl group, tert-butyl group, sec-butyl group, 1-methyl-butyl group, 1-ethyl-butyl group, pentyl group, n-pentyl group, isopentyl group, neopentyl group, tert-pentyl group, hexyl group, n-hexyl group, 1-methylpentyl group, 2-methylpentyl group, 4-methyl-2-pentyl group, 3,3-dimethylbutyl group, 2-ethylbutyl group, heptyl group, n-heptyl group, 1-methylhexyl group, octyl group, n-octyl group, tert-octyl group, 1-methylheptyl group, 2-ethylhexyl group, 2-propylpentyl group, n-nonyl group, 2,2-dimethylheptyl group, 1-ethyl-propyl group, There are 1,1-dimethyl-propyl groups, isohexyl groups, 2-methylpentyl groups, 4-methylhexyl groups, 5-methylhexyl groups, etc., but are not limited to these.

[0073] In the present specification, the alkenyl group comprises a straight or branched chain having 2 to 60 carbon atoms and may be further substituted by other substituents. The number of carbon atoms of the alkenyl group may be 2 to 60, specifically 2 to 40, more specifically 2 to 20. Specific examples include, but are not limited to, vinyl groups, 1-propenyl groups, isopropenyl groups, 1-butenyl groups, 2-butenyl groups, 3-butenyl groups, 1-pentenyl groups, 2-pentenyl groups, 3-pentenyl groups, 3-methyl-1-butenyl groups, 1,3-butadienyl groups, allyl groups, 1-phenylvinyl-1-yl groups, 2-phenylvinyl-1-yl groups, 2,2-diphenylvinyl-1-yl groups, 2-phenyl-2-(naphthyl-1-yl)vinyl-1-yl groups, 2,2-bis(diphenyl-1-yl)vinyl-1-yl groups, stilbenyl groups, styrenyl groups, etc.

[0074] In the present specification, the alkynyl group comprises a straight or branched chain having 2 to 60 carbon atoms and may be further substituted by other substituents. The number of carbon atoms of the alkynyl group may be 2 to 60, specifically 2 to 40, more specifically 2 to 20.

[0075] In this specification, a haloalkyl group refers to an alkyl group substituted with a halogen group, and specific examples include -CF3, -CF2CF3, etc., but are not limited thereto.

[0076] In this specification, the alkoxy group is represented as -O(R101), and R101 may be an example of the aforementioned alkyl group.

[0077] In this specification, the aryloxy group is represented as -O(R102), and R102 may be an example of the aryl group described above.

[0078] In this specification, the alkylthoxy group is represented as -S(R103), and R103 may be an example of the alkyl group described above.

[0079] In this specification, the arylthioxy group is represented as -S(R104), and R104 may be an example of the aryl group described above.

[0080] In this specification, the alkyl sulfoxy group is represented as -S(=0)2(R105), and R105 may be an example of the alkyl group described above.

[0081] In this specification, the aryl sulfoxy group is represented as -S(=0)2(R106), and R106 may be an example of the aryl group described above.

[0082] In this specification, the cycloalkyl group comprises a monocyclic or polycyclic group having 3 to 60 carbon atoms and may be further substituted by other substituents. Here, polycyclic means a group in which the cycloalkyl group is directly connected to or condensed with another ring group. Here, the other ring group may be a cycloalkyl group, but may also be other types of ring groups, such as a heterocycloalkyl group, an aryl group, a heteroaryl group, etc. The number of carbon atoms of the cycloalkyl group may be 3 to 60, specifically 3 to 40, and more specifically 5 to 20. Specifically, cyclopropyl group, cyclobutyl group, cyclopentyl group, 3-methylcyclopentyl group, 2,3-dimethylcyclopentyl group, cyclohexyl group, 3-methylcyclohexyl group, 4-methylcyclohexyl group, 2,3-dimethylcyclohexyl group, 3,4,5-trimethylcyclohexyl group, 4-tert-butylcyclohexyl group, cycloheptyl group, cyclooctyl group, etc. are included, but are not limited thereto.

[0083] In this specification, the heterocycloalkyl group comprises O, S, Se, N, or Si as a heteroatom, comprises a monocyclic or polycyclic group having 2 to 60 carbon atoms, and may be further substituted by other substituents. Here, polycyclic means a group in which the heterocycloalkyl group is directly connected to or condensed with another ring group. Here, the other ring group may be a heterocycloalkyl group, but may also be other types of ring groups, such as a cycloalkyl group, an aryl group, a heteroaryl group, etc. The number of carbon atoms of the heterocycloalkyl group may be 2 to 60, specifically 2 to 40, and more specifically 3 to 20.

[0084] In this specification, the aryl group comprises a monocyclic or polycyclic group having 6 to 60 carbon atoms and may be further substituted by other substituents. Here, polycyclic means a group in which the aryl group is directly connected to or condensed with another ring group. Here, the other ring group may be an aryl group, but may also be other types of ring groups, such as cycloalkyl groups, heterocycloalkyl groups, heteroaryl groups, etc. The aryl group includes a spiro group. The number of carbon atoms of the aryl group may be 6 to 60, specifically 6 to 40, and more specifically 6 to 25. Specific examples of the above aryl groups include, but are not limited to, phenyl groups, biphenyl groups, terphenyl groups, naphthyl groups, anthryl groups, chrysenyl groups, phenanthrenyl groups, perylenyl groups, fluoranthenyl groups, triphenylenyl groups, phenalenyl groups, pyrenyl groups, tetracenyl groups, pentacenyl groups, fluorenyl groups, indenyl groups, acenaphthylenyl groups, benzofluorenyl groups, spirobifluorenyl groups, 2,3-dihydro-1H-indenyl groups, and condensation rings thereof.

[0085] In the present specification, the terphenyl group may be selected from the following structures.

[0086]

[0087] In the present specification, the fluorenyl group may be substituted, and adjacent substituents may combine with each other to form a ring.

[0088] When the above fluorenyl group is substituted, it may be any one of the following structures, but is not limited thereto.

[0089]

[0090] In this specification, the heteroaryl group comprises S, O, Se, N, or Si as a heteroatom and comprises a monocyclic or polycyclic group having 2 to 60 carbon atoms, and may be further substituted by other substituents. Here, the polycyclic group means a group in which the heteroaryl group is directly connected to or condensed with another ring group. Here, the other ring group may be a heteroaryl group, but may also be a different type of ring group, such as a cycloalkyl group, a heterocycloalkyl group, an aryl group, etc. The number of carbon atoms of the heteroaryl group may be 2 to 60, specifically 2 to 40, and more specifically 3 to 25.Specific examples of the above heteroaryl groups include pyridine group, pyrrole group, pyrimidine group, pyridazine group, furan group, thiophene group, imidazole group, pyrazol group, oxazole group, isoxazole group, thiazole group, isothiaazole group, triazole group, furazane group, oxadiazole group, thiadiazole group, dithiazole group, tetrazolyl group, pyran group, thiopyran group, diazine group, oxazine group, thiazine group, dioxin group, triazine group, tetrazine group, quinoline group, isoquinoline group, quinazolin group, isoquinazolin group, quinozolin group, naphthiridine group, acridine group, phenanthridine group, imidazopyridine group, diazanaphthalene group, triazinidene group, indole group, indolizine group, benzothiazole group, benzoxazole group, Benzimidazole group, benzothiophene group, benzofuran group, dibenzothiophene group, dibenzofuran group, carbazole group, benzocarbazole group, dibenzocarbazole group, phenazine group, dibenzosilol group, Spirobi(dibenzosilol), dihydrophenazine group, phenoxazine group, phenanthridine group, thienyl group, indolo[2,3-a]carbazole group, indolo[2,3-b]carbazole group, indolin group, 10,11-dihydro-dibenzo[b,f]azepine group, 9,10-dihydroacridine group, phenanthrazine group, phenothiathiazine group, phthalazine group, phenanthroline group, naphthobenzofuran group, naphthobenzothiophene group, benzo[c][1,2,5]thiadiazole group, Examples include 2,3-dihydrobenzo[b]thiophene group, 2,3-dihydrobenzofuran group, 5,10-dihydrodibenzo[b,e][1,4]azacillin group, pyrazolo[1,5-c]quinazolin group, pyrido[1,2-b]indazole group, pyrido[1,2-a]imidazo[1,2-e]indolin group, 5,11-dihydroindeno[1,2-b]carbazole group, but are not limited to these.

[0091] In this specification, when a substituent is a carbazole group, it means bonding to the nitrogen or carbon of the carbazole.

[0092] In the present specification, when a carbazole group is substituted, an additional substituent may be substituted on the nitrogen or carbon of the carbazole.

[0093] In this specification, the benzocarbazole group may be any one of the following structures.

[0094]

[0095] In this specification, the dibenzocarbazole group may be any one of the following structures.

[0096]

[0097] In the present specification, the naphthobenzofuran group may be any one of the following structures.

[0098]

[0099] In the present specification, the naphthobenzothiophene group may be any one of the following structures.

[0100]

[0101] In the present specification, the silyl group is a substituent comprising Si and in which the Si atom is directly connected as a radical, and is represented as -Si(R107)(R108)(R109), and R107 to R109 are identical or different from each other and may each be a substituent consisting of at least one of hydrogen; deuterium; halogen group; alkyl group; alkenyl group; alkoxy group; cycloalkyl group; heterocycloalkyl group; aryl group; and heteroaryl group.

[0102] Specific examples of silyl groups include (trimethylsilyl group), (triethylsilyl group), (t-butyldimethylsilyl group), (vinyldimethylsilyl group), (propyldimethylsilyl group), (triphenylsilyl group), (diphenylsilyl group), (phenylsilyl group), etc., are included, but are not limited thereto.

[0103] In this specification, the phosphine oxide group is represented as -P(=O)(R110)(R111), and R110 and R111 are identical or different from each other and may each be a substituent consisting of at least one of hydrogen; deuterium; halogen group; alkyl group; alkenyl group; alkoxy group; cycloalkyl group; heterocycloalkyl group; aryl group; and heteroaryl group. Specifically, it may be substituted with an alkyl group or an aryl group, and the examples described above may apply to the alkyl group and the aryl group. For example, the phosphine oxide group may include dimethylphosphine oxide, diphenylphosphine oxide, dinaphthylphosphine oxide, etc., but is not limited thereto.

[0104] In the present specification, the amine group is represented as -N(R112)(R113), and R112 and R113 are identical or different from each other and may each be a substituent consisting of at least one of hydrogen; deuterium; halogen group; alkyl group; alkenyl group; alkoxy group; cycloalkyl group; heterocycloalkyl group; aryl group; and heteroaryl group. The amine group may be selected from the group consisting of -NH2; monoalkylamine group; monoarylamine group; monoheteroarylamine group; dialkylamine group; diarylamine group; diheteroarylamine group; alkylarylamine group; alkylheteroarylamine group; and arylheteroarylamine group, and the number of carbon atoms is not particularly limited, but is preferably 1 to 30. Specific examples of the above amine groups include, but are not limited to, methylamine, dimethylamine, ethylamine, diethylamine, phenylamine, naphthylamine, biphenylamine, dibiphenylamine, anthracenylamine, 9-methyl-anthracenylamine, diphenylamine, phenylnaphthylamine, ditolylamine, phenyltolylamine, triphenylamine, biphenylnaphthylamine, phenylbiphenylamine, biphenylfluorenylamine, phenyltriphenyllenylamine, biphenyltriphenyllenylamine, etc.

[0105] In this specification, the examples of aryl groups described above may be applied, except that the arylene group is a divalent group.

[0106] In this specification, the examples of the aforementioned heteroaryl groups may be applied, except that the heteroaryl group is a divalent group.

[0107] In this specification, "adjacent" groups may mean a substituent substituted on an atom directly connected to the atom on which the substituent is substituted, a substituent located closest to the atom on which the substituent is substituted, or another substituent substituted on the atom on which the substituent is substituted. For example, two substituents substituted at ortho positions in a benzene ring and two substituents substituted on the same carbon in an aliphatic ring may be interpreted as "adjacent" groups to each other.

[0108] The hydrocarbon rings and heterocycles that can be formed by adjacent groups include aliphatic hydrocarbon rings, aromatic hydrocarbon rings, aliphatic heterocycles, and aromatic heterocycles, and except that the rings are not monovalent groups, structures exemplified by the aforementioned cycloalkyl groups, aryl groups, heterocycloalkyl groups, and heteroaryl groups may be applied.

[0109] In one embodiment of the present application, a group not represented by a substituent; or a group represented by hydrogen, may all mean that they are substitutable for deuterium. That is, hydrogen; or deuterium may indicate a state in which they are mutually substitutable.

[0110] In general, compounds bonded with hydrogen and compounds substituted with deuterium show differences in thermodynamic behavior. This is because the mass of a deuterium atom is twice that of hydrogen, and due to this difference in atomic mass, deuterium has the characteristic of having lower vibrational energy.

[0111] Furthermore, the single bond dissociation energy between carbon and deuterium is higher than that between carbon and hydrogen. Therefore, structures substituted with deuterium increase the thermal stability of the molecule, which has the effect of improving the lifespan of devices utilizing it.

[0112] When compounds are deposited on a silicon wafer, materials containing deuterium tend to be packed with tighter intermolecular distances. Furthermore, observation of the thin film surface using an Atomic Force Microscope (AFM) confirms that thin films fabricated with deuterium-containing compounds are deposited as a more uniform surface without any areas of aggregation.

[0113] One embodiment of the present application provides an organic light-emitting device comprising a first electrode, a second electrode, and one or more organic layers provided between the first electrode and the second electrode, wherein one or more of the organic layers comprise a heterocyclic compound represented by Formula 1 and a heterocyclic compound represented by Formula 2.

[0114] [Chemical Formula 1]

[0115]

[0116] [Chemical Formula 2]

[0117]

[0118] In the above chemical formulas 1 and 2,

[0119] X is O; S; or CRaRb; and,

[0120] L is a directly bonded; or a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, and

[0121] l is an integer from 1 to 3, and if l is 2 or greater, L are equal to or different from each other, and

[0122] A is an aryl ring having 6 to 60 carbon atoms substituted or unsubstituted with deuterium; or a heterocyclic ring having 2 to 60 carbon atoms substituted or unsubstituted with deuterium, and

[0123] Ra, Rb, Rd, Ar1, Ar3, and Ar4 are each independently hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, and

[0124] Ar2 is a substituted or unsubstituted aryl group having 10 to 60 carbon atoms; or a heteroaryl group having 2 to 60 carbon atoms, and

[0125] a is an integer from 0 to 4, and if a is 2 or greater, Rd are equal or different, and

[0126] H is hydrogen, D is deuterium, and,

[0127] d is an integer from 1 to 6, and

[0128] The above chemical formula 1 is represented by the following structural formulas A to C, and

[0129] [Structural Formula A]

[0130]

[0131] [Structural Formula B]

[0132]

[0133] [Structural Formula C]

[0134]

[0135] In the above structural formulas A to C,

[0136] refers to the positions where they combine with each other,

[0137] The deuterium content of the above structural formula B is 50% or more and 100% or less, and

[0138] R1 to R9 are the same or different from one another and each independently hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; substituted or unsubstituted alkenyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkynyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkoxy group having 1 to 60 carbon atoms; substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; substituted or unsubstituted aryl group having 6 to 60 carbon atoms; substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms; substituted or unsubstituted phosphine oxide group; Selected from the group consisting of substituted or unsubstituted amine groups, or two or more adjacent groups combine to form a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 60 carbon atoms or a substituted or unsubstituted heterocyclic ring having 2 to 60 carbon atoms, d1 is an integer from 0 to 2, and when d1 is an integer of 2, R9 are the same or different from each other, and

[0139] L1 and L2 are the same or different from each other and each independently, directly bonded; a substituted or unsubstituted arylene group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroarylene group having 2 to 60 carbon atoms; and

[0140] m and n are integers from 0 to 4, and

[0141] p and q are integers from 1 to 6, and

[0142] If m, n, p, and q are 2 or more, the substituents within the parentheses are the same or different from each other, and

[0143] The deuterium content of the above chemical formula 2 is 5% or more and 100% or less.

[0144] In one embodiment of the present application, the deuterium content of the structural formula B may be 50% or more and 100% or less.

[0145] In another embodiment, the deuterium content of the structural formula B may be 50% or more and 100% or less, specifically the deuterium content of the structural formula B may be 55% or more and 100% or less, and more specifically the deuterium content of the structural formula B may be 60% or more and 100% or less.

[0146] In addition, the present application satisfies the deuterium content of the above structural formula B, and at the same time, the deuterium content of structural formulas A and C may be as follows.

[0147] In one embodiment of the present application, the deuterium content of the structural formula A may be 10% or less, and the deuterium content of the structural formula C may be 10% or less.

[0148] In another embodiment, the deuterium content of the structural formula A may be 10% or less, specifically the deuterium content of the structural formula A may be 5% or less, more specifically the deuterium content of the structural formula A may be 3% or less, and the deuterium content of the structural formula A may be 0% or more, or 1% or more.

[0149] In another embodiment, the deuterium content of the structural formula C may be 10% or less, specifically the deuterium content of the structural formula C may be 5% or less, more specifically the deuterium content of the structural formula C may be 3% or less, and the deuterium content of the structural formula C may be 0% or more, or 1% or more.

[0150] Among the heterocyclic compounds represented by the above chemical formula 1, when the deuterium substitution rate of structural formula B is 50% or more and 100% or less, and at the same time the deuterium content of structural formulas A and C satisfies the aforementioned range, the vibration energy and rotation energy of the molecule are lowered, and the stability of the molecular structure is increased, so the lifespan of the device is excellent.

[0151] In the present application, the above chemical formula 1 may be represented by any one of the following chemical formulas 1-1 to 1-3.

[0152] [Chemical Formula 1-1]

[0153]

[0154] [Chemical Formula 1-2]

[0155]

[0156] [Chemical Formula 1-3]

[0157]

[0158] In the above chemical formulas 1-1 to 1-3,

[0159] The definition of each substituent is the same as the definition in Chemical Formula 1 above.

[0160] In particular, in the above chemical formulas 1-1 to 1-3, when Fused carbazole and triazine have ortho-position bonds based on the phenyl linker as in chemical formula 1-1, Through-Space Charge Transfer (TSCT) occurs. That is, electron transfer is possible not only through intramolecular bonding but also through intramolecular space, so the electron transfer capability is much superior compared to cases where they are substituted at other positions, and accordingly, the performance of the device containing it is excellent.

[0161] In the present application, X is O; S; or CRaRb.

[0162] In the present application, X is O.

[0163] In the present application, X is S.

[0164] In the present application, X is CRaRb.

[0165] In the present application, Ra and Rb are each independently hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms.

[0166] In another embodiment, Ra and Rb may each independently be a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms.

[0167] In another embodiment, Ra and Rb may each independently be a substituted or unsubstituted alkyl group having 1 to 40 carbon atoms.

[0168] In another embodiment, Ra and Rb may each independently be a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms.

[0169] In another embodiment, Ra and Rb may each independently be a substituted or unsubstituted straight-chain alkyl group having 1 to 10 carbon atoms; or a substituted or unsubstituted branched-chain alkyl group having 3 to 10 carbon atoms.

[0170] In another embodiment, Ra and Rb may each independently be a straight-chain alkyl group having 1 to 10 carbon atoms substituted or unsubstituted with deuterium; or a branched-chain alkyl group having 3 to 10 carbon atoms substituted or unsubstituted with deuterium.

[0171] In another embodiment, Ra and Rb may each independently be a methyl group substituted or unsubstituted with deuterium; and an ethyl group substituted or unsubstituted with deuterium.

[0172] In this case, for a methyl group substituted with deuterium, the deuterium includes all cases where one, two, or three deuterium atoms are substituted into the methyl group.

[0173] In the present application, L may be a direct bond; or a substituted or unsubstituted arylene group having 6 to 60 carbon atoms.

[0174] In another embodiment, L may be a directly bonded; or a substituted or unsubstituted arylene group having 6 to 40 carbon atoms.

[0175] In another embodiment, L may be a directly bonded; or a substituted or unsubstituted arylene group having 6 to 20 carbon atoms.

[0176] In another embodiment, L may be a direct bond; or an arylene group having 6 to 20 carbon atoms.

[0177] In another embodiment, L may be a direct bond; a phenylene group; or a biphenylene group.

[0178] In another embodiment, L may be a direct connection.

[0179] In one embodiment of the present application, Ar1 is hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, and Ar2 may be a substituted or unsubstituted aryl group having 10 to 60 carbon atoms; or a heteroaryl group having 2 to 60 carbon atoms.

[0180] In another embodiment, Ar1 is hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, and Ar2 may be a substituted or unsubstituted aryl group having 10 to 60 carbon atoms; or a heteroaryl group having 2 to 60 carbon atoms.

[0181] In one embodiment of the present application, Ar1 may be hydrogen; deuterium; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms.

[0182] In another embodiment, Ar1 may be hydrogen; deuterium; a substituted or unsubstituted alkyl group having 1 to 40 carbon atoms; a substituted or unsubstituted aryl group having 6 to 40 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 40 carbon atoms.

[0183] In another embodiment, Ar1 may be hydrogen; deuterium; a substituted or unsubstituted alkyl group having 1 to 40 carbon atoms; a substituted or unsubstituted aryl group having 6 to 40 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 40 carbon atoms.

[0184] In another embodiment, Ar1 may be hydrogen; deuterium; a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms; a substituted or unsubstituted aryl group having 6 to 30 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms.

[0185] In another embodiment, Ar1 may be hydrogen; deuterium; a substituted or unsubstituted aryl group having 6 to 20 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 20 carbon atoms containing O or S.

[0186] In another embodiment, Ar1 may be hydrogen; deuterium; a substituted or unsubstituted monocyclic aryl group having 6 to 10 carbon atoms; a substituted or unsubstituted polycyclic aryl group having 10 to 20 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 20 carbon atoms.

[0187] In another embodiment, Ar1 may be hydrogen; deuterium; a monocyclic aryl group having 6 to 10 carbon atoms substituted or unsubstituted with an aryl group having 6 to 10 carbon atoms; or a heteroaryl group having 2 to 20 carbon atoms.

[0188] In another embodiment, Ar1 may be hydrogen; deuterium; a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted terphenyl group; a substituted or unsubstituted triphenylenyl group; a substituted or unsubstituted dibenzofuran group; or a substituted or unsubstituted dibenzothiophene group.

[0189] In another embodiment, Ar1 may be hydrogen; deuterium; a phenyl group; a biphenyl group substituted or unsubstituted with a phenyl group; a terphenyl group; a triphenylenyl group; a dibenzofuran group; or a dibenzothiophene group.

[0190] In one embodiment of the present application, Ar2 may be a substituted or unsubstituted aryl group having 10 to 60 carbon atoms; or a heteroaryl group having 2 to 60 carbon atoms.

[0191] In another embodiment, Ar2 may be a substituted or unsubstituted aryl group having 10 to 40 carbon atoms; or a heteroaryl group having 2 to 40 carbon atoms.

[0192] In another embodiment, Ar2 may be a substituted or unsubstituted aryl group having 10 to 20 carbon atoms; or an unsubstituted heteroaryl group having 2 to 20 carbon atoms.

[0193] In another embodiment, Ar2 may be an aryl group having 10 to 20 carbon atoms; or an unsubstituted heteroaryl group having 2 to 20 carbon atoms.

[0194] In another embodiment, Ar2 may be a biphenyl group; a terphenyl group; a triphenylenyl group; a dibenzofuran group; or a dibenzothiophene group.

[0195] In one embodiment of the present application, Ar2 may be represented by a substituted or unsubstituted aryl group having 10 to 60 carbon atoms; or by the following chemical formula A.

[0196] [Chemical Formula A]

[0197]

[0198] In the above chemical formula A,

[0199] X2 is O; or S, and

[0200] chemical formula means the position where it is combined.

[0201] As described above, when at least one substituent in the structure of the triazine has a long-chain aryl group or a heteroaryl group, the number of electrons resonating within the molecule increases. These increased electrons are moved more efficiently by the expanded LUMO. Consequently, the driving voltage is lowered and the luminescence efficiency is increased.

[0202] In the present application, A is an aryl ring having 6 to 60 carbon atoms substituted or unsubstituted with deuterium; or a heterocyclic ring having 2 to 60 carbon atoms substituted or unsubstituted with deuterium.

[0203] In another embodiment, A may be an aryl ring having 6 to 60 carbon atoms that is substituted or unsubstituted with deuterium.

[0204] In another embodiment, A may be an aryl ring having 6 to 40 carbon atoms that is substituted or unsubstituted with deuterium.

[0205] In another embodiment, A may be an aryl ring having 6 to 20 carbon atoms that is substituted or unsubstituted with deuterium.

[0206] In another embodiment, A may be a single-ring aryl ring having 6 to 20 carbon atoms that is substituted or unsubstituted with deuterium.

[0207] In another embodiment, A may be a benzene ring substituted or unsubstituted with deuterium.

[0208] In this case, the deuterium content of A can be included in the deuterium content of structural formula B.

[0209] In the present application, the above A may be represented by the following structural formula A-1 or A-2.

[0210] [Structural Formula A-1]

[0211]

[0212] [Structural Formula A-2]

[0213]

[0214] In the above structural formulas A-1 and A-2,

[0215] represents the condensation location,

[0216] X3 is O; S; or NRe, and

[0217] R11 to R19 are the same or different from each other and are each independently hydrogen; or deuterium, and

[0218] Re is hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, and

[0219] The above a1 is an integer of 1 or 2, and

[0220] If a1 is 2, the substituents inside the parentheses are either the same or different.

[0221] In the present application, Rd is hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms.

[0222] In another embodiment, Rd is hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 40 carbon atoms; a substituted or unsubstituted aryl group having 6 to 40 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 40 carbon atoms.

[0223] In another embodiment, Rd is hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms; a substituted or unsubstituted aryl group having 6 to 20 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 20 carbon atoms.

[0224] In another embodiment, Rd is hydrogen; or deuterium;

[0225] In one embodiment of the present application, the deuterium substitution rate of the compound of Formula 1 may be 10% or more and 60% or less.

[0226] In another embodiment, the deuterium substitution rate of the compound of Formula 1 may be 15% or more and 60% or less.

[0227] In another embodiment, the deuterium substitution rate of the compound of Formula 1 may be 20% or more and 55% or less.

[0228] In the present application, the deuterium content of the above chemical formula 2 may be 5% or more and 100% or less.

[0229] In another embodiment, the deuterium content of the above formula 2 may be 5% or more and 100% or less, the deuterium content of the above formula 2 may be 10% or more and 100% or less, and the deuterium content of the above formula 2 may be 15% or more and 100% or less.

[0230] Chemical formula 2 of the present application has a large resonance effect due to the fused ring. When a compound with such a large resonance effect is substituted with deuterium, the resonance contribution increases, thereby enhancing the delocalization of pi electrons, and consequently, the HOMO value becomes shallower, increasing hole mobility. In addition, the resonance stabilization effect is large, increasing the stability of the molecule.

[0231] In the present application, the above chemical formula 2 may be represented by any one of the following chemical formulas 2-1 to 2-6.

[0232] [Chemical Formula 2-1]

[0233]

[0234] [Chemical Formula 2-2]

[0235]

[0236] [Chemical Formula 2-3]

[0237]

[0238] [Chemical Formula 2-4]

[0239]

[0240] [Chemical Formula 2-5]

[0241]

[0242] [Chemical Formula 2-6]

[0243]

[0244] In the above chemical formulas 2-1 to 2-6,

[0245] The definition of each substituent is the same as the definition in Chemical Formula 2 above.

[0246] In the present application, R1 to R9 are the same or different from one another and each independently hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; substituted or unsubstituted alkenyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkynyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkoxy group having 1 to 60 carbon atoms; substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; substituted or unsubstituted aryl group having 6 to 60 carbon atoms; substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms; substituted or unsubstituted phosphine oxide group; Two or more groups selected from the group consisting of substituted or unsubstituted amine groups, or adjacent to each other, combine to form a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 60 carbon atoms or a substituted or unsubstituted heterocyclic ring having 2 to 60 carbon atoms.

[0247] In another embodiment, R1 to R9 may be the same or different from each other and may each independently be hydrogen; deuterium; halogen; cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms.

[0248] In another embodiment, R1 to R9 may be the same or different from each other and may each independently be hydrogen; deuterium; halogen; cyano group; a substituted or unsubstituted alkyl group having 1 to 40 carbon atoms; a substituted or unsubstituted aryl group having 6 to 40 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 40 carbon atoms.

[0249] In another embodiment, R1 to R9 may be the same or different from each other and may each independently be hydrogen; deuterium; halogen; cyano group; a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms; a substituted or unsubstituted aryl group having 6 to 20 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 20 carbon atoms.

[0250] In another embodiment, R1 to R9 may be the same or different from each other and may each independently be hydrogen; deuterium; halogen; cyano group; a substituted or unsubstituted aryl group having 6 to 20 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 20 carbon atoms.

[0251] In another embodiment, R1 to R9 may be the same or different from each other and may each independently be hydrogen; or deuterium.

[0252] In the present application, L1 and L2 are the same or different from each other and each independently, directly bonded; a substituted or unsubstituted arylene group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroarylene group having 2 to 60 carbon atoms.

[0253] In another embodiment, L1 and L2 are the same or different from each other and each independently, directly bonded; a substituted or unsubstituted arylene group having 6 to 40 carbon atoms; or a substituted or unsubstituted heteroarylene group having 2 to 40 carbon atoms.

[0254] In another embodiment, L1 and L2 are the same or different from each other and each independently, directly bonded; an arylene group having 6 to 20 carbon atoms substituted or unsubstituted with deuterium; or a heteroarylene group having 2 to 20 carbon atoms substituted or unsubstituted with deuterium.

[0255] In another embodiment, L1 and L2 may be the same or different from each other and each independently be a direct bond; a phenylene group substituted or unsubstituted with deuterium; a biphenylene group substituted or unsubstituted with deuterium; or a naphthalene group substituted or unsubstituted with deuterium.

[0256] In another embodiment, L1 and L2 may be the same or different from each other and each independently directly bonded; or a phenylene group substituted or unsubstituted with deuterium.

[0257] In the present application, Ar3 and Ar4 are the same or different from each other and are each independently deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms.

[0258] In another embodiment, Ar3 and Ar4 are the same or different from each other and are each independently a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms.

[0259] In another embodiment, Ar3 and Ar4 are the same or different from each other and each independently a substituted or unsubstituted aryl group having 6 to 40 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 40 carbon atoms.

[0260] In another embodiment, Ar3 and Ar4 are the same or different from each other and are each independently a substituted or unsubstituted aryl group having 6 to 20 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 20 carbon atoms.

[0261] In another embodiment, Ar3 and Ar4 are each the same or different and independently an aryl group having 6 to 20 carbon atoms that is substituted or unsubstituted with deuterium; or a heteroaryl group having 2 to 20 carbon atoms that is substituted or unsubstituted with one or more substituents selected from the group consisting of deuterium and an aryl group having 6 to 20 carbon atoms that is substituted or unsubstituted with deuterium.

[0262] In another embodiment, Ar3 and Ar4 may be the same or different from each other and each independently be a substituted or unsubstituted phenyl group; a substituted or unsubstituted biphenyl group; a substituted or unsubstituted terphenyl group; a substituted or unsubstituted dibenzofuran group; or a substituted or unsubstituted dibenzothiophen group.

[0263] In another embodiment, Ar3 and Ar4 may be the same or different and each independently a phenyl group substituted or unsubstituted with deuterium; a biphenyl group substituted or unsubstituted with deuterium; a terphenyl group substituted or unsubstituted with deuterium; a triphenylenyl group substituted or unsubstituted with deuterium; a dibenzofuran group substituted or unsubstituted with one or more substituents selected from the group consisting of deuterium and a phenyl group substituted or unsubstituted with deuterium; or a dibenzothiophene group substituted or unsubstituted with one or more substituents selected from the group consisting of deuterium and a phenyl group substituted or unsubstituted with deuterium.

[0264] In one embodiment of the present specification, the formula 1 may be represented by any one of the following compounds.

[0265]

[0266]

[0267]

[0268]

[0269]

[0270]

[0271]

[0272]

[0273]

[0274]

[0275]

[0276]

[0277]

[0278]

[0279] In the present application, the heterocyclic compound of Formula 2 may be represented by any one of the following compounds.

[0280]

[0281]

[0282]

[0283] When the compound of Chemical Formula 1 and the compound of Chemical Formula 2 are simultaneously included in the organic layer of an organic light-emitting device, superior efficiency and lifespan effects are observed. Based on these results, it can be expected that an exciplex phenomenon occurs when the two compounds are included simultaneously.

[0284] The exciplex phenomenon described above is a phenomenon in which energy of the HOMO level of the donor (p-host) and the LUMO level of the acceptor (n-host) is emitted through electron exchange between two molecules. When the exciplex phenomenon occurs between two molecules, Reverse Intersystem Crossing (RISC) takes place, which can increase the internal quantum efficiency of the fluorescence to 100%. When a donor (p-host) with good hole transport capability and an acceptor (n-host) with good electron transport capability are used as hosts in the emissive layer, holes are injected into the p-host and electrons are injected into the n-host, which allows the driving voltage to be lowered and thus helps improve the lifespan.

[0285] In one embodiment of the present application, the heterocyclic compound represented by Chemical Formula 1 and Chemical Formula 2 can be used as a light-emitting material in the light-emitting layer of an organic light-emitting device.

[0286] In another embodiment, the heterocyclic compound represented by Chemical Formula 1 and Chemical Formula 2 can be used as a host material for the light-emitting layer of an organic light-emitting device.

[0287] In one embodiment of the present application, the first electrode may be an anode and the second electrode may be a cathode.

[0288] In another embodiment, the first electrode may be a negative electrode and the second electrode may be a positive electrode.

[0289] In one embodiment of the present application, the organic light-emitting device may be a blue organic light-emitting device, and the heterocyclic compound represented by Chemical Formula 1 and Chemical Formula 2 may be used as a material for the blue organic light-emitting device.

[0290] In one embodiment of the present application, the organic light-emitting device may be a green organic light-emitting device, and the heterocyclic compound represented by Chemical Formula 1 and Chemical Formula 2 may be used as a material for the green organic light-emitting device.

[0291] In one embodiment of the present application, the organic light-emitting device may be a red organic light-emitting device, and the heterocyclic compound represented by Chemical Formula 1 and Chemical Formula 2 may be used as a material for the red organic light-emitting device.

[0292] In one embodiment of the present application, the organic light-emitting device may be a blue organic light-emitting device, and the heterocyclic compound represented by Chemical Formula 1 and Chemical Formula 2 may be used as a light-emitting layer material of the blue organic light-emitting device.

[0293] In one embodiment of the present application, the organic light-emitting device may be a green organic light-emitting device, and the heterocyclic compound represented by Chemical Formula 1 and Chemical Formula 2 may be used as a light-emitting layer material of the green organic light-emitting device.

[0294] In one embodiment of the present application, the organic light-emitting device may be a red organic light-emitting device, and the heterocyclic compound represented by Chemical Formula 1 and Chemical Formula 2 may be used as a light-emitting layer material of the red organic light-emitting device.

[0295] The organic light-emitting device of the present invention can be manufactured by conventional methods and materials for manufacturing organic light-emitting devices, except that one or more organic layers are formed using the aforementioned heterocyclic compound.

[0296] The above heterocyclic compound can be formed as an organic layer by vacuum deposition as well as solution coating when manufacturing an organic light-emitting device. Here, solution coating refers to spin coating, dip coating, inkjet printing, screen printing, spraying, roll coating, etc., but is not limited to these.

[0297] The organic layer of the organic light-emitting device of the present invention may be formed as a single layer structure, but may also be formed as a multilayer structure in which two or more organic layers are stacked. For example, the organic light-emitting device of the present invention may have a structure including a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, etc. as organic layers. However, the structure of the organic light-emitting device is not limited thereto and may include a smaller number of organic layers.

[0298] In one embodiment of the present application, Ir(ppy)3, a green phosphorescent dopant, may be used as an iridium-based dopant.

[0299] In one embodiment of the present application, (piq)2(Ir)(acac), a red phosphorescent dopant, may be used as an iridium-based dopant.

[0300] In one embodiment of the present application, the organic light-emitting element comprises an organic layer comprising a light-emitting layer, and the light-emitting layer comprises the heterocyclic compound.

[0301] In one embodiment of the present application, the organic light-emitting element comprises an organic layer comprising a light-emitting layer, wherein the light-emitting layer comprises a host material, and the host material comprises the heterocyclic compound.

[0302] In the organic light-emitting device of the present invention, the organic layer comprises an electron injection layer or an electron transport layer, and the electron injection layer or the electron transport layer may comprise the heterocyclic compound.

[0303] In another organic light-emitting device, the organic layer includes a hole-blocking layer, and the hole-blocking layer may include the heterocyclic compound.

[0304] In another organic light-emitting device, the organic layer includes an electron blocking layer, and the electron blocking layer may include the heterocyclic compound.

[0305] In another organic light-emitting device, the organic layer comprises a hole transport layer, a light-emitting layer, or an electron blocking layer, and the hole transport layer, the light-emitting layer, or the electron blocking layer may comprise the heterocyclic compound.

[0306] In another organic light-emitting device, the organic layer comprises a hole transport layer or a hole transport auxiliary layer, and the hole transport layer or the hole transport auxiliary layer may comprise the heterocyclic compound.

[0307] In the organic light-emitting device of the present application, materials with a relatively large work function may be used as the anode material, and transparent conductive oxides, metals, or conductive polymers may be used. Specific examples of the anode material include metals such as vanadium, chromium, copper, zinc, and gold, or alloys thereof; metal oxides such as zinc oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide (IZO); combinations of metals and oxides such as ZnO:Al or SnO2:Sb; and conductive polymers such as poly(3-methylthiophene), poly[3,4-(ethylene-1,2-dioxy)thiophene](PEDOT), polypyrrole, and polyaniline, but are not limited thereto.

[0308] Materials with a relatively low work function can be used as cathode materials, and metals, metal oxides, or conductive polymers can be used. Specific examples of the above cathode materials include metals such as magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin, and lead, or alloys thereof; multilayer structural materials such as LiF / Al or LiO2 / Al, but are not limited to these.

[0309] As the hole injection material, known hole injection materials may be used, for example, phthalocyanine compounds such as copper phthalocyanine or starburst-type amine derivatives described in the literature [Advanced Material, 6, p. 677 (1994)], such as tris(4-carbazoyl-9-ylphenyl)amine (TCTA), 4,4',4"-tri[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA), 1,3,5-tris[4-(3-methylphenylphenylamino)phenyl]benzene (m-MTDAPB), soluble conductive polymers such as polyaniline / dodecylbenzenesulfonic acid or poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate), Polyaniline / Camphor sulfonic acid or polyaniline / poly(4-styrene-sulfonate), etc., may be used.

[0310] Pyrazolin derivatives, arylamine derivatives, stilbene derivatives, triphenyldiamine derivatives, etc., may be used as hole transport materials, and low molecular weight or high molecular weight materials may also be used.

[0311] As electron transport materials, metal complexes of oxadiazole derivatives, anthraquinodimethane and its derivatives, benzoquinone and its derivatives, naphthoquinone and its derivatives, anthraquinone and its derivatives, tetracyanoanthraquinodimethane and its derivatives, fluorenone derivatives, diphenyldicyanoethylene and its derivatives, diphenoquinone derivatives, 8-hydroxyquinoline and its derivatives, etc., may be used, and not only low molecular weight materials but also high molecular weight materials may be used.

[0312] For example, LiF is commonly used as an electron injection material in the industry, but the present application is not limited thereto.

[0313] As the light-emitting material, red, green, or blue light-emitting materials may be used, and if necessary, two or more light-emitting materials may be mixed and used. In this case, two or more light-emitting materials may be deposited and used as individual sources, or they may be pre-mixed and deposited as a single source. Additionally, fluorescent materials may be used as light-emitting materials, or phosphorescent materials may be used. As the light-emitting material, a material that emits light by combining holes and electrons injected from the anode and cathode, respectively, may be used alone, but materials in which a host material and a dopant material participate in light emission together may also be used.

[0314] When using a mixture of hosts for light-emitting materials, hosts of the same series may be mixed, or hosts of different series may be mixed. For example, two or more types of materials, such as n-type host materials or p-type host materials, may be selected and used as the host material for the light-emitting layer.

[0315] An organic light-emitting device according to one embodiment of the present application may be a front-emitting type, a back-emitting type, or a double-sided emitting type depending on the material used.

[0316] A heterocyclic compound according to one embodiment of the present application can operate in organic electronic devices, including organic solar cells, organic photosensitive materials, and organic transistors, on a principle similar to that applied to organic light-emitting devices.

[0317] The organic light-emitting device of the present invention may further include one or more layers selected from the group consisting of a light-emitting layer, a hole injection layer, a hole transport layer, a hole transport assist layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

[0318] The organic light-emitting device of the present invention may further include one or more layers selected from the group consisting of a light-emitting layer, a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

[0319] FIGS. 1 to 3 illustrate the stacking sequence of electrodes and organic layers of an organic light-emitting device according to one embodiment of the present application. However, the scope of the present application is not intended to be limited by these figures, and structures of organic light-emitting devices known in the art may be applied to the present application.

[0320] According to FIG. 1, an organic light-emitting device is shown in which an anode (200), an organic layer (300), and a cathode (400) are sequentially stacked on a substrate (100). However, the structure is not limited to this, and an organic light-emitting device in which a cathode, an organic layer, and an anode are sequentially stacked on a substrate may be implemented as shown in FIG. 2.

[0321] Figure 3 illustrates a case where the organic layer is multilayered.

[0322] The organic light-emitting device according to FIG. 3 includes a hole injection layer (301), a hole transport layer (302), a light-emitting layer (303), a hole blocking layer (304), an electron transport layer (305), and an electron injection layer (306).

[0323] However, the scope of the present application is not limited by such a stacked structure, and, if necessary, layers other than the light-emitting layer may be omitted, or other necessary functional layers may be added.

[0324] The organic layer containing the above chemical formula 1 may additionally include other materials as needed.

[0325] In the organic light-emitting device of the present invention, the organic layer may include a heterocyclic compound represented by Formula 1 and a heterocyclic compound represented by Formula 2. The organic layer may be formed by pre-mixing the heterocyclic compound represented by Formula 1 and the heterocyclic compound represented by Formula 2 and using a thermal vacuum deposition method.

[0326] In one embodiment of the present application, a composition for an organic layer of an organic light-emitting device is provided, comprising a heterocyclic compound represented by Formula 1; and a heterocyclic compound represented by Formula 2.

[0327] The composition for the organic layer of the organic light-emitting device comprises a heterocyclic compound represented by Chemical Formula 1; and a heterocyclic compound represented by Chemical Formula 2, wherein the weight ratio of the heterocyclic compound represented by Chemical Formula 2 may be higher than the weight ratio of the heterocyclic compound represented by Chemical Formula 1.

[0328] In the present application, the weight ratio of the heterocyclic compound represented by Formula 1 and the heterocyclic compound represented by Formula 2 in the composition may be 20:80 to 45:55.

[0329] In another embodiment, the weight ratio of the heterocyclic compound represented by Formula 1 and the heterocyclic compound represented by Formula 2 in the composition may be 20:80 to 45:55, specifically 25:75 to 40:60, and more specifically 30:70 to 40:60.

[0330] When the above weight ratio is satisfied, the mobility of holes and electrons is balanced, so the emission zone is located in the center of the EML layer. Specifically, the amount of holes injected into the light-emitting layer can increase. Basically, the more holes injected into a device with fast electron injection, the faster recombination occurs. Consequently, the number of electrons accumulated at the interface decreases, which lowers molecular instability caused by excess electrons and extends the device's lifespan. As recombination occurs more rapidly, the number of annihilated excitons decreases, resulting in improved luminous efficiency.

[0331] In one embodiment of the present application, a method for manufacturing an organic light-emitting device is provided, comprising the steps of: preparing a substrate; forming a first electrode on the substrate; forming one or more organic layers on the first electrode; and forming a second electrode on the organic layers, wherein the step of forming the organic layers includes forming one or more organic layers using a composition for organic layers according to one embodiment of the present application.

[0332] In one embodiment of the present application, a method for manufacturing an organic light-emitting device is provided, wherein the step of forming the organic layer is formed by supplying the heterocyclic compound represented by Formula 1 and the heterocyclic compound represented by Formula 2 as separate sources, and then forming the layer using a thermal vacuum deposition method.

[0333] In one embodiment of the present application, a method for manufacturing an organic light-emitting device is provided, wherein the step of forming the organic layer is formed by pre-mixing a heterocyclic compound represented by Formula 1 and a heterocyclic compound represented by Formula 2 and using a thermal vacuum deposition method.

[0334] The above pre-mixed means mixing the materials first and placing them in a container to mix the heterocyclic compound of Formula 1 and the heterocyclic compound of Formula 2 before depositing them onto an organic layer.

[0335] The pre-mixed material may be referred to as a composition for an organic layer according to one embodiment of the present application.

[0336] An organic light-emitting device according to one embodiment of the present application can be manufactured by a conventional method and material for manufacturing organic light-emitting devices, except that an organic layer is formed using the aforementioned heterocyclic compound.

[0337] The organic light-emitting device of the present invention may further include one or more layers selected from the group consisting of a light-emitting layer, a hole injection layer, a hole transport layer, an electron blocking layer, an electron injection layer, an electron transport layer, a hole assist layer, and a hole blocking layer.

[0338] The above composition can be used when forming an organic layer of an organic light-emitting device, and can be used more preferably as a host material for a light-emitting layer.

[0339] The above composition is in the form of a simple mixture of two or more compounds. Before forming the organic layer of the organic light-emitting diode, materials in a powder state may be mixed, or compounds that are in a liquid state at an appropriate temperature or higher may be mixed. The above composition is in a solid state below the melting point of each material, and can be maintained in a liquid state by adjusting the temperature.

[0340] The above composition may additionally include materials known in the art, such as solvents and additives.

[0341] The present specification is described in more detail below through examples, but these are for illustrative purposes only and are not intended to limit the scope of the present application.

[0342] <Preparation Example>

[0343] [Preparation Example 1] Preparation of Compound 1-2

[0344]

[0345] 1) Preparation of intermediate 1-2-1

[0346] 12H-benzo[4,5]thieno[2,3-a]carbazole [A] (10 g, 0.037 mol), Triflic acid (77.74 g, 0.52 mol), D6-Benzene (200 mL), and Chloroform (100 mL) were added to a one-neck round-bottom flask and refluxed at 100°C. After the reaction was complete, the mixture was cooled and water was added to neutralize it. The precipitated solid was filtered and mixed with methanol slurry and acetone slurry to obtain intermediate 1-2-1 (9.92 g, yield 95%).

[0347] The deuterium substitution rate can be controlled by manufacturing under reaction conditions as shown in Table 1 below.

[0348] Triflic acid D6-Benzene Chloroform Reaction Temperature Reaction Time Deuterium Substitution Rate Reaction Condition 1 14 eq 20 T 10 T 100℃ 5 h 100% Reaction Condition 2 10 eq 15 T 10 T 80℃ 3 h 51~99% Reaction Condition 3 7 eq 10 T 15 T 50℃ 1 h 50%

[0349] 2) Preparation of Compound 1-2

[0350] Intermediate 1-2-1 (9.92 g, 0.035 mol), 2-([1,1'-biphenyl]-4-yl)-4-(2-fluorophenyl)-6-phenyl-1,3,5-triazine [B] (14.12 g, 0.035 mol), Cs2CO3 (22.81 g, 0.07 mol), and DMA (100 mL) were added to a one-neck round-bottom flask, and the mixture was refluxed at 185°C. After the reaction was complete, the precipitated solid was filtered, dissolved in 1,2-Dichlorobenzene, filtered via silica gel, and concentrated to obtain Compound 1-2 (19.14 g, yield 82%).

[0351] Target compound C of Table 2 below was obtained by synthesizing in the same manner as the above preparation example, except that the reactants [A] and [B] of the above preparation example were changed to reactants A and B of Table 2 below.

[0352]

[0353]

[0354]

[0355]

[0356]

[0357]

[0358] [Preparation Example 2] Preparation of Compound 2-20

[0359]

[0360] 1) Preparation of intermediate 2-20-1

[0361] 5-([1,1'-biphenyl]-3-yl)-5,8-dihydroindolo[2,3-c]carbazole [A] (10 g, 0.024 mol), 4-bromo-1,1':4',1''-terphenyl [B] (7.42 g, 0.024 mol), Pd2(dba)3 (1.10 g, 0.0012 mol), SPhos (1.97 g, 0.0048 mmol), NaOH (1.92 g, 0.048 mol), and Xylene (100 mL) were added to a one-neck round-bottom flask, and the mixture was refluxed at 153 °C. After cooling, extraction was performed, and the organic layer was filtered using a silica gel filter to obtain intermediate 2-20-1 (9.93 g, yield 65%).

[0362] 2) Preparation of Compound 2-20

[0363] Intermediate 2-20-1 (9.93 g, 0.016 mol), Triflic acid (40.8 g, 0.27 mol), and D6-Benzene (120 mL) were added to a single-neck round-bottom flask, and the mixture was refluxed at 70°C. The mixture was quenched and extracted with DCM and H2O, concentrated, and filtered using a silica gel filter. After concentration, the solution was treated with methanol to obtain compound 2-20 (6.74 g, 63%).

[0364] Target compound C of Table 3 below was prepared in the same manner, except that [A] and [B] of the above preparation example were replaced with reactants A and B of Table 3 below, respectively.

[0365]

[0366] In addition to the compounds prepared in Preparation Examples 1 and 2, Table 2, and Table 3 above, compounds according to Chemical Formula 1 and Chemical Formula 2 described above were also synthesized in the same manner, and the compounds synthesized in the preparation examples above were confirmed through 1H-NMR and FD-mass spectrometry. Table 4 shows the measured values ​​from FD-mass spectrometry (FD-MS: Field desorption mass spectrometry), and Table 5 shows the measured values ​​from 1H NMR (DMSO, 300 MHz).

[0367] Compound FD-Mass Compound FD-Mass 1-2 m / z = 666.27 (C 45 H 18 D 10 N4S=666.87)1-8m / z= 666.27 (C 45 H 18 D 10 N4S=666.87)1-14m / z= 680.25 (C 45 H 16 D 10 N4OS=680.85)1-18m / z=661.23 (C 45 H 23 D5N4S=661.84)1-27m / z= 737.27 (C 51 H 27D5N4S=737.94)1-30m / z= 675.21 (C 45 H 21 D5N4OS=675.82)1-36m / z= 739.28 (C 51 H 25 D7N4S=739.95)1-43m / z= 739.28 (C 51 H 25 D7N4S=739.95)1-50m / z= 666.27 (C 45 H 18 D 10 N4S=666.87)1-58m / z= 742.30 (C 51 H 22 D 10 N4S=742.97)1-70m / z= 661.23 (C 45 H 23 D5N4S=661.84)1-80m / z= 781.20 (C 51 H 23 D5N4OS2=781.96)1-84m / z= 738.27 (C 51 H 26 D6N4S=738.94)1-92m / z= 738.27 (C51H26D6N4S=738.94)1-100m / z= 726.32 (C 51 H 22 D 10 N4O=726.91)1-110m / z= 664.27 (C 45 H 16 D 10 N4O2=664.79)1-117m / z= 721.29 (C 51 H 27 D5N4O=721.87)1-124m / z= 721.29 (C 51 H 27 D5N4O=721.87)1-130m / z= 647.27 (C 45 H 21 D7N4O=647.79)1-138m / z= 722.30 (C 51 H 26 D6N4O=722.88)1-146m / z= 650.29 (C 45 H 18 D 10N4O=650.81)1-155m / z=723.30 (C 51 H 25 D7N4O=723.89)1-165m / z=758.41 (C 54 H 22 D 16 N4=759.02)1-174m / z= 696.36 (C 48 H 16 D 16 N4O=696.91)1-180m / z=750.36 (C 54 H 30 D8N4=750.97)1-188m / z=750.36 (C 54 H 30 D8N4=750.97)1-199m / z= 676.34 (C 48 H 24 D 10 N4=676.89)1-208m / z=814.30 (C 54 H 22 D 12 N4S2=815.09)1-211m / z= 678.35 (C 48 H 22 D 12 N4=678.90)1-219m / z= 755.00 (C 54 H 26 D 12 N4=754.38)2-20m / z= 660.41 (C48H8D24N2=660.94)2-29m / z= 584.38 (C42H4D24N2=584.85)2-38m / z= 588.40 (C42D28N2=588.87)2-43m / z= 584.38 (C42H4D24N2=584.85)2-54m / z= 507.34 (C36HD23N2=507.74)

[0368] 화합물 1H NMR(CDCl3, 200Mz)1-2δ = 8.36 (2H, m), 7.91~7.96 (4H, m), 7.75~7.80 (3H, m), 7.41~7.50 (7H, m), 7.25 (2H, d)1-8δ = 8.36~8.38 (3H, m), 7.91~7.94 (3H, m), 7.73~7.80 (4H, m), 7.61 (1H, d), 7.41~7.50 (7H, m)1-14δ = 8.36 (2H, m), 7.91~8.03 (4H, m), 7.76~7.82 (3H, m), 7.31~7.54 (7H, m)1-18δ = 8.36 (2H, m), 7.91~7.96 (5H, m), 7.75~7.81 (4H, m), 7.41~7.50 (10H, m), 7.25 (2H, d)1-27δ = 8.36 (2H, m), 7.91~8.03 (7H, m), 7.76~7.82 (4H, m), 7.31~7.54 (8H, m)1-30δ = 8.36 (2H, m), 7.91~8.03 (7H, m), 7.76~7.82 (4H, m), 7.31~7.54 (8H, m)1-36δ = 7.91~7.99 (8H, m), 7.75~7.80 (5H, m), 7.41~7.49 (7H, m), 7.25 (4H, d)1-43δ = 8.36~8.38 (3H, m), 7.91~7.99 (5H, m), 7.25~7.80 (5H ,m), 7.61 (3H, d), 7.41~7.50 (9H, m)1-50δ = 8.36 (2H, m), 8.21~8.24 (2H, m), 7.96 (2H, d), 7.60~7.75 (4H, m), 7.41~7.50 (6H, m), 7.25 (2H, d)1-58δ = 8.36~8.38 (3H, m), 7.91~7.94 (5H, m), 7.73~7.75 (3H, m), 7.61 (1H, d), 7.41~7.50 (6H, m), 7.25 (4H, s)1-70δ = 8.36~8.38 (3H, m), 8.21~8.24 (2H, m), 8.05 (1H, d), 7.94~7.99 (3H, m), 7.60~7.75 (6H, m), 7.41~7.50 (8H, m)1-80δ = 8.45 (1H, d), 8.20~8.24 (4H, m), 7.93~8.03 (6H, m), 7.76~7.82 (2H, m), 7.31~7.68 (10H, m)1-84δ = 8.21~8.24 (2H, m), 7.60~7.99 (6H, m), 7.60~7.75 (6H, m), 7.41~7.49 (8H, m), 7.25 (4H, d)1-92δ = 8.55 (1H, d), 8.36 (2H, m), 8.21~8.24 (2H, m), 7.94~7.96 (3H, d), 7.60~7.75 (7H, m), 7.41~7.50 (8H, m), 7.25 (3H, m)1-100δ = 7.91~7.96 (6H, m), 7.75~7.80 (5H, m), 7.41~7.49 (7H, m), 7.25 (4H, d)1-110δ = 8.36 (2H, m), 7.91~8.03 (4H, m), 7.76~7.82 (3H, m), 7.31~7.54 (7H, m)1-117δ = 8.38 (2H, d), 7.91~7.94 (4H, d), 7.61~7.81 (12H, m), 7.41~7.49 (9H, m)1-124δ = 8.36 (2H, m), 7.91~7.96 (6H, m), 7.72~7.81 (6H, m), 7.61~7.65 (4H, m), 7.41~7.50 (7H, m), 7.25 (2H, d)1-130δ = 8.36 (2H, m), 7.91~7.96 (5H, m), 7.75~7.81 (4H, m), 7.36~7.50 (8H, m), 7.25 (2H, d)1-138δ = 8.36~8.38 (3H, m), 7.91~7.94 (3H, m), 7.72~7.80 (5H, m), 7.61 (1H, d), 7.41~7.50 (9H, m), 7.25 (4H, s)1-146δ = 8.36 (2H, m), 8.21~8.24 (2H, m), 7.96 (2H, d), 7.60~7.75 (4H, m), 7.41~7.50 (6H, m), 7.25 (2H, d)1-155δ = 8.36~8.38 (3H, m), 7.91~7.94 (6H, d), 7.73~7.75 (4H, m), 7.61 (3H, d), 7.36~7.50 (9H, m)1-165δ = 8.38 (2H, d), 7.91~7.94 (4H, m), 7.73~7.80 (7H, m), 7.61 (2H, d), 7.41~7.49 (7H, m)1-174δ = 8.36 (2H, m), 7.91~8.03 (4H, m), 7.76~7.82 (3H, m), 7.31~7.54 (7H, m)1-180δ = 7.91~7.96 (7H, m), 7.75~7.81 (7H, m), 7.41~7.49 (9H, m), 7.25 (4H, d), 2.22 (1H, s), 1.80~2.00 (2H, m)1-188δ = 8.36 (2H, m), 7.91~7.96 (7H, m), 7.73~7.81 (5H, m), 7.59~7.61 (3H, d), 7.41~7.52 (8H, m), 7.25 (2H, d), 2.20 (1H, s), 1.80~2.00 (2H, m)1-199δ = 8.36 (2H, m), 7.91~7.96 (6H, m), 7.75~7.80 (3H, m), 7.41~750 (7H, m), 7.25 (2H, d), 7.16 (1H, s), 2.20 (2H, s)1-208δ = 8.45 (2H, d), 8.20~8.24 (4H, m), 7.91~7.94 (6H, m), 7.80 (1H, t), 7.46~7.56 (7H, m), 2.20 (2H, s)1-211δ = 8.36~8.38 (3H, m), 7.91~7.96 (6H, m), 7.73~7.75 (3H, m), 7.61 (1H, d) 7.41~7.52 (8H, m), 2.20 (1H, s)1-219δ = 8.36~8.38 (3H, m), 7.91~7.94 (6H, d), 7.73~7.75 (4H, m), 7.61 (3H, d), 7.35~7.52 (9H, m), 2.20 (1H, s)2-20δ = 7.96 (1H, s), 7.81~7.86 (3H, d), 7.64~7.67 (3H, d), 7.50 (1H, s)2-29δ = 7.96 (1H, s), 7.77 (1H, s), 7.47~7.50 (2H, d)2-38δ = Deuterium content at 100%. 1 H NMR no peaks 2-43δ = 7.82 (1H, s), 7.64–7.67 (2H, d), 7.52 (1H, s) 2-54δ = 7.49 (1H, s)

[0369] <Experimental Example 1>

[0370] 1) Fabrication of Organic Light Emitting Diodes (Single Host)

[0371] A glass substrate coated with a thin film of ITO to a thickness of 1,500 Å was cleaned with distilled water ultrasonics. After cleaning with distilled water, the substrate was ultrasonically cleaned with solvents such as acetone, methanol, and isopropyl alcohol, dried, and then UVO treatment was performed using UV light in a UV cleaner for 5 minutes. Subsequently, the substrate was transferred to a plasma cleaner (PT), and plasma treatment was performed under vacuum to remove the ITO work function and residual film, after which it was transferred to a thermal evaporation equipment for organic deposition.

[0372] A common layer, a hole injection layer 2-TNATA (4,4',4"-Tris[2-naphthyl(phenyl)amino]triphenylamine) and a hole transport layer NPB (N,N′-Di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine), was formed on the above ITO transparent electrode (anode).

[0373] An emissive layer was thermally vacuum deposited on top of it as follows. For the emissive layer, the compound listed in Table 6 below was used as the host, and Ir(ppy)3 (tris(2-phenylpyridine)iridium) was used as the green phosphorescent dopant. The host was doped with 7% Ir(ppy)3 and deposited to a thickness of 400 Å. Subsequently, BCP (Bathocuproine) was deposited as a hole blocking layer to a thickness of 60 Å, and Alq3 was deposited as an electron transport layer to a thickness of 200 Å on top of it. Finally, an electron injection layer was formed by depositing lithium fluoride (LiF) to a thickness of 10 Å on the electron transport layer, and then an aluminum (Al) cathode was formed by depositing an aluminum cathode to a thickness of 1200 Å on the electron injection layer to form a cathode, thereby fabricating an organic electroluminescent device.

[0374] Meanwhile, all organic compounds required for OLED device fabrication are 10 each for each material -8 ~10 -6 It was purified by vacuum sublimation under torr and used for OLED fabrication.

[0375] 2) Driving voltage and luminous efficiency of organic electroluminescent devices

[0376] The electroluminescence (EL) characteristics of the organic electroluminescent device fabricated as described above were measured using MaxScience's M7000, and based on the measurement results, the reference brightness was 6,000 cd / m² using a lifetime measurement device (M6000) manufactured by MaxScience 2 When, T 90 Measured.

[0377] The driving voltage, luminous efficiency, color coordinates (CIE), and lifetime of the organic light-emitting diode manufactured according to the present invention were measured and are as shown in Table 6 below.

[0378] Compound driving voltage efficiency color lifetime (V)(cd / A)(T 90Comparative Example 13-16.90 54.1 Green 84 Comparative Example 23-27.50 50.2 Green 70 Comparative Example 33-36.72 60.4 Green 93 Comparative Example 43-46.84 55.6 Green 87 Comparative Example 53-56.70 61.3 Green 95 Comparative Example 63-66.82 55.9 Green 89 Comparative Example 73-76.92 53.8 Green 81 Comparative Example 83-87.40 50.6 Green 73 Comparative Example 91-21.51 39.7 Green 247 Comparative Example 101-81.53 35.6 Green 244 Comparative Example 111-141.50 37.2 Green 250 Comparative Example 121-181.75 25.9 Green 236 131-271.72127.6Green238 Comparative Example 141-301.78126.4Green235 Comparative Example 151-361.65136.8Green242 Comparative Example 161-431.66135.9Green240 Comparative Example 171-504.0685.7Green180 Comparative Example 181-584.1184.6Green177 Comparative Example 191-704.4976.2Green162 Comparative Example 201-804.4276.6Green164 Comparative Example 211-844.3380.7Green167 Comparative Example 221-924.3681.6Green170 Comparative Example 231-1002.06118.7Green230 Comparative Example 241-1102.09119.6Green227 Comparative Example 251-1172.78100.2Green210 Comparative Example 261-1242.75100.9Green216 Comparative Example 271-1302.54110.7Green222 Comparative Example 281-1382.58111.6Green225 Comparative Example 291-1464.7770.2Green150 Comparative Example 301-1554.8272.8Green154 Comparative Example 311-1653.0594.6Green200 Comparative Example 321-1743.0994.4Green196 Comparative Example 331-1803.7590.6Green187 Comparative Example 341-1883.7891.3Green185 Comparative Example 351-1993.5293.7Green190 Comparative Example 361-2083.5594.5Green192 Comparative Example 371-2115.3265.8Green132 Comparative Example 381-2195.4166.2Green138

[0379]

[0380] <Experimental Example 2> Fabrication of Organic Light Emitting Diode (2-Type Host)

[0381] A glass substrate coated with a thin film of indium tin oxide (ITO) to a thickness of 1,500 Å was cleaned with distilled water ultrasonics. After cleaning with distilled water, the substrate was ultrasonically cleaned with solvents such as acetone, methanol, and isopropyl alcohol, dried, and then treated with UVO (ultraviolettozone) using UV light for 5 minutes in an ultraviolet (UV) cleaner. Subsequently, the substrate was transferred to a plasma cleaner (PT), subjected to plasma treatment under vacuum to remove the ITO work function and residual film, and then transferred to a thermal evaporation equipment for organic deposition.

[0382] A common layer, a hole injection layer 2-TNATA (4,4',4"-Tris[2-naphthyl(phenyl)amino]triphenylamine) and a hole transport layer NPB (N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine), was formed on the above ITO transparent electrode (anode).

[0383] An emissive layer was thermally vacuum deposited on top of it as follows. For the emissive layer, one compound described in Chemical Formula 1 and one compound described in Chemical Formula 2 were deposited as hosts at a thickness of 400 Å from their respective sources as shown in Table 7 below, and a green phosphorescent dopant was deposited by doping Ir(ppy)3 with 7%. Subsequently, BCP was deposited as a hole blocking layer at a thickness of 60 Å, and Alq3 was deposited as an electron transport layer at a thickness of 200 Å on top of it. Finally, an electron injection layer was formed by depositing lithium fluoride (LiF) to a thickness of 10 Å on the electron transport layer, and then an aluminum (Al) cathode was formed by depositing an aluminum cathode to a thickness of 1,200 Å on the electron injection layer to form a cathode, thereby fabricating an organic electroluminescent device.

[0384] Meanwhile, all organic compounds required for OLED device fabrication are 10 each for each material -6 ~10 -8 It was purified by vacuum sublimation under torr and used for OLED fabrication.

[0385] Compound Ratio Driving Voltage Efficiency Color Coordinates Lifetime (V) (cd / A) (T 90)Comparative Example 391-2 : 3-940 : 605.1074.2Green135 Comparative Example 4035 : 655.1273.5Green138 Comparative Example 4130 : 705.1573.1Green140 Comparative Example 421-50 : 3-940 : 605.3472.7Green131 Comparative Example 4335 : 655.3871.4Green133 Comparative Example 4430 : 705.4170.8Green136 Comparative Example 451-70 : 3-1040 : 605.4371.9Green130 Comparative Example 4635 : 655.4470.8Green131 Comparative Example 4730 : 705.4870.2Green134 Comparative Example 481-130 : 3-1040 : 605.2373.6Green132 Comparative Example 4935 : 655.2573.3Green134 Comparative Example 5030 : 705.2972.8Green137 Comparative Example 511-8 : 3-1140 : 601.15150.3Green200 Comparative Example 5235 : 651.18147.2Green204 Comparative Example 5330 : 701.20145.3Green208 Comparative Example 541-50 : 3-1140 : 603.1680.5Green100 Comparative Example 5535 : 653.1878.3Green103 Comparative Example 5630 : 703.2177.2Green109 Comparative Example 573-1 : 3-1140 : 605.7065.2Green111 Comparative Example 5835 : 655.7364.8Green115 Comparative Example 5930 : 705.7764.2Green119 Comparative Example 603-2 : 2-2040 : 605.7264.7Green110 Comparative Example 6135 : 655.7564.2Green113 Comparative Example 6230 : 705.8064.0Green117 Comparative Example 633-3 : 3-1240 : 605.6067.7Green122 Comparative Example 6435 : 655.6367.4Green124 Comparative Example 6530 : 705.6667.1Green128 Comparative Example 663-3 : 2-2940 : 605.5868.0Green125 Comparative Example 6735 : 655.5567.6Green127 Comparative Example 6830 : 705.5367.2Green129 Comparative Example 693-4 : 3-1240 : 605.6267.3 Green120 Comparative Example 7035 : 655.6566.6 Green123 Comparative Example 7130 : 705.6866.1 Green125 Comparative Example 723-4 : 2-3840 : 605.6168.1 Green122 Comparative Example 7335 : 655.6367.9 Green125 Comparative Example 7430 : 705.6567.5 Green127 Comparative Example 753-5 : 3-1140 : 605.5168.7 Green126 Comparative Example 7635 : 655.5468.4 Green129 Comparative Example 7730 : 705.5568.0Green130 Comparative Example 783-6 : 2-4340 : 605.5668.5Green125 Comparative Example 7935 : 655.5868.2Green127 Comparative Example 8030 : 705.6167.8Green129 Comparative Example 813-7 : 2-1240 : 605.7265.5Green113 Comparative Example 8235 : 655.7565.2Green116 Comparative Example 8330 : 705.7964.8Green118 Comparative Example 843-8 : 2-4340 : 605.7165.0Green111 Comparative Example 8535 : 655.7364.8Green114 Comparative Example 8630 : 705.7664.5Green119 Example 11-2 : 2-3840 : 601.02160.0Green315 Example 235 : 651.06158.7Green318 Example 330 : 701.08157.4Green320 Example 41-8 : 2-4340 : 601.05158.2Green316 Example 535 : 651.07157.4Green319 Example 630 : 701.09155.6Green320 Example 71-14 : 2-2940 : 601.03157.9Green310 Example 835 : 651.05156.4Green312 Example 930 : 701.09155.2Green315 Example 101-18 : 2-3840 : 601.32146.5Green300 Example 1135 : 651.35145.2Green302 Example 1230 : 701.38142.9Green310 Example 131-27 : 2-2040 : 601.36145.2 Green299 Example 1435 : 651.37144.9 Green303 Example 1530 : 701.40143.6 Green307 Example 161-30 : 2-3840 : 601.26147.8 Green293 Example 1735 : 651.29146.1 Green296 Example 1830 : 701.32145.4 Green299 Example 191-36 : 2-4340 : 601.11152.6 Green310 Example 2035 : 651.13151.4 Green312 Example 2130 : 701.18150.3Green315 Example 221-43 : 2-3840 : 601.13155.2Green308 Example 2335 : 651.17154.6Green310 Example 2430 : 701.19153.2Green316 Example 251-50 : 2-2940 : 603.0595.0Green190 Example 2635 : 653.0894.3Green192 Example 2730 : 703.1093.5Green195 Example 281-58 : 2-4340 : 603.0994.7Green192 Example 2935 : 653.1393.5Green196 Example 3030 : 703.1792.1Green199 Example 311-70 : 2-4 340 : 603.8291.5Green183 Example 3235 : 653.8591.2Green186 Example 3330 : 703.8790.4Green188 Example 341-80 : 2-2 040 : 603.8491.1Green185 Example 3535 : 653.8890.5Green189 Example 3630 : 703.9090.3Green190 Example 371-84 : 2-5 440 : 603.5493.7Green192 Example 3835 : 653.5592.5Green194 Example 3930 : 703.5792.2Green196 Example 401-92 : 2-3840 : 603.5694.5Green187 Example 4135 : 653.6193.6Green188 Example 4230 : 703.6492.7Green190 Example 431-100 : 2-4340 : 601.50140.1 Green281 Example 4435 : 651.52138.2 Green285 Example 4530 : 701.55137.6 Green288 Example 461-110 : 2-4340 : 601.53139.2 Green280 Example 4735 : 651.55137.5 Green284 Example 4830 : 701.59136.8 Green287 Example 491-117 : 2-5440 : 601.83127.4 Green260 Example 5035 : 651.85126.1 Green262 Example 5130 : 701.88125.6Green265 Example 521-124 : 2-5440 : 601.81125.3Green263 Example 5335 : 651.83124.1Green266 Example 5430 : 701.87122.8Green268 Example 551-130 : 2-2940 : 601.71132.6Green273 Example 5635 : 651.73130.4Green277 Example 5730 : 701.74128.9Green280 Example 581-138 : 2-2940 : 601.73130.5Green271 Example 5935 : 651.76129.4Green274 Example 6030 : 701.79128.7Green278 Example 611-146 : 2-4340 : 604.4284.2Green164 Example 6235 : 654.4483.6Green166 Example 6330 : 704.4982.1Green169 Example 641-155 : 2-5440 : 604.5183.3Green168 Example 6535 : 654.5382.6Green172 Example 6630 : 704.5881.4Green176 Example 671-165 : 2-5440 : 602.05120.0Green244 Example 6835 : 652.07119.4Green248 Example 6930 : 702.09118.7Green250 Example 701-174 : 2-4340 : 602.02119.7Green241 Example 7135 : 652.06118.5Green243 Example 7230 : 702.08117.4 Green247 Example 731-180 : 2-2040 : 602.51110.2 Green210 Example 7435 : 652.55109.4 Green214 Example 7530 : 702.58108.3 Green219 Example 761-188 : 2-3840 : 602.46110.1 Green211 Example 7735 : 652.49108.7 Green217 Example 7830 : 702.53107.4 Green220 Example 791-199 : 2-5440 : 602.80115.2 Green234 Example 8035 : 652.83114.6Green237 Example 8130 : 702.85113.1Green240 Example 821-208 : 2-3840 : 602.81114.9Green232 Example 8335 : 652.84112.7Green236 Example 8430 : 702.89112.2Green239 Example 851-211 : 2-5440 : 604.8779.2Green150 Example 8635 : 654.8978.1Green153 Example 8730 : 704.9277.3Green158 Example 881-219 : 2-3840 : 604.9478.8Green152 Example 8935 : 654.9677.5Green155 Example 9030 : 704.9975.6Green159.

[0386]

[0387] As can be seen from Tables 6 and 7 above, it was confirmed that when the heterocyclic compound of Formula 1 and the heterocyclic compound of Formula 2 are simultaneously included in the organic layer of an organic light-emitting device, superior efficiency and lifespan characteristics are exhibited compared to when each is included individually. Based on these excellent results, it can be predicted that an exciplex phenomenon occurred when the two compounds are included simultaneously.

[0388] The exciplex phenomenon described above is a phenomenon in which electron exchange occurs between two molecules, releasing energy equivalent to the HOMO level of the electron donor molecule (p-host) and the LUMO level of the electron acceptor molecule (n-host). When an electron donor molecule (p-host) with good hole transport capability and an electron acceptor molecule (n-host) with good electron transport capability are used together as hosts in the emissive layer, holes are injected into the electron donor molecule (p-host), and electrons are injected into the electron acceptor molecule (n-host). When the exciplex phenomenon occurs, Reverse Intersystem Crossing (RISC) takes place smoothly, which allows the internal quantum efficiency of the emission to reach up to 100%. Additionally, it allows for a reduction in the driving voltage, which is a significant advantage for extending the lifespan.

[0389] When electrons rapidly enter the device, C of Capacitance, an important element in high refresh rate displays max Although the value can be reduced, the HOMO region may be oxidized by rapidly entering excess electrons or easily degraded through radical reactions. The present invention improves device lifespan by increasing oxidation stability by necessarily substituting structural formula B, which acts as the HOMO of Chemical Formula 1, with deuterium. Furthermore, substituting Ar2 among the triazine substituents of Chemical Formula 1 with a specific substituent as in the present invention expands the LUMO, providing a pathway for efficient electron movement. Through this, the interaction with the pi orbitals of adjacent molecules increases due to the expanded LUMO, lowering the barrier for electron intermolecular transfer, thereby lowering the driving voltage and improving luminous efficiency.

[0390] However, as can be seen from the results in Table 6, when the compound of Formula 1 is used alone, the electron mobility may be too fast, which leads to a problem where the balance between electrons and holes is disrupted. As can be seen from the results in Table 7, this can be compensated for by combining it with Formula 2.

[0391] That is, Chemical Formula 2 is a compound having an indolocarbazole core, and due to the fused ring portion, the resonance effect is greater than that of Comparative Examples 3-9 to 3-12. Accordingly, the delocalization of pi electrons is pronounced, and the HOMO energy level becomes shallower. In other words, the mobility of holes is very fast.

[0392] A device fabricated by combining Chemical Formula 1 and Chemical Formula 2, which have these characteristics, exhibits excellent driving voltage, luminous efficiency, and lifespan while reducing the capacitance value.

Claims

1. An organic light-emitting device comprising a first electrode, a second electrode, and one or more organic layers provided between the first electrode and the second electrode, An organic light-emitting device comprising at least one layer among the above organic layers, the heterocyclic compound represented by the following chemical formula 1 and the heterocyclic compound represented by the following chemical formula 2: [Chemical Formula 1] [Chemical Formula 2] In the above chemical formulas 1 and 2, X is O; S; or CRaRb; and, L is a directly bonded; or a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, and l is an integer from 1 to 3, and if l is 2 or greater, L are equal to or different from each other, and A is an aryl ring having 6 to 60 carbon atoms substituted or unsubstituted with deuterium; or a heterocyclic ring having 2 to 60 carbon atoms substituted or unsubstituted with deuterium, and Ra, Rb, Rd, Ar1, Ar3, and Ar4 are each independently hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, and Ar2 is a substituted or unsubstituted aryl group having 10 to 60 carbon atoms; or a heteroaryl group having 2 to 60 carbon atoms, and a is an integer from 0 to 4, and if a is 2 or greater, Rd are equal or different, and H is hydrogen, D is deuterium, and, d is an integer from 1 to 6, and The above chemical formula 1 is represented by the following structural formulas A to C, and [Structural Formula A] [Structural Formula B] [Structural Formula C] In the above structural formulas A to C, refers to the positions where they combine with each other, The deuterium content of the above structural formula B is 50% or more and 100% or less, and R1 to R9 are the same or different from one another and each independently hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; substituted or unsubstituted alkenyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkynyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkoxy group having 1 to 60 carbon atoms; substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; substituted or unsubstituted aryl group having 6 to 60 carbon atoms; substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms; substituted or unsubstituted phosphine oxide group; Selected from the group consisting of substituted or unsubstituted amine groups, or two or more adjacent groups combine to form a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 60 carbon atoms or a substituted or unsubstituted heterocyclic ring having 2 to 60 carbon atoms, d1 is an integer from 0 to 2, and when d1 is an integer of 2, R9 are the same or different from each other, and L1 and L2 are the same or different from each other and each independently, directly bonded; a substituted or unsubstituted arylene group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroarylene group having 2 to 60 carbon atoms; and m and n are integers from 0 to 4, and p and q are integers from 1 to 6, and If m, n, p, and q are 2 or more, the substituents within the parentheses are the same or different from each other, and The deuterium content of the above chemical formula 2 is 5% or more and 100% or less.

2. In Claim 1, An organic light-emitting device in which the deuterium content of the above structural formula A is 10% or less, and the deuterium content of the above structural formula C is 10% or less.

3. In Claim 1, An organic light-emitting device wherein the above chemical formula 1 is represented by any one of the following chemical formulas 1-1 to 1-3: [Chemical Formula 1-1] [Chemical Formula 1-2] [Chemical Formula 1-3] In the above chemical formulas 1-1 to 1-3, The definition of each substituent is the same as the definition in Chemical Formula 1 above.

4. An organic light-emitting element according to claim 1, wherein A is represented by the following structural formula A-1 or A-2: [Structural Formula A-1] [Structural Formula A-2] In the above structural formulas A-1 and A-2, represents the condensation location, X3 is O; S; or NRe, and R11 to R19 are the same or different from each other and are each independently hydrogen; or deuterium, and Re is hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, and The above a1 is an integer of 1 or 2, and If a1 is 2, the substituents inside the parentheses are either the same or different.

5. In Claim 1, An organic light-emitting device having a deuterium substitution rate of the compound of Chemical Formula 1 of the above formula of 10% or more and 60% or less.

6. In Claim 1, An organic light-emitting device in which Ar2 is an aryl group having 10 to 20 carbon atoms; or an unsubstituted heteroaryl group having 2 to 20 carbon atoms.

7. An organic light-emitting device according to claim 1, wherein the chemical formula 1 is represented by any one of the following compounds:

8. An organic light-emitting device according to Claim 1, wherein Chemical Formula 2 is represented by any one of the following compounds:

9. An organic light-emitting device according to claim 1, wherein the organic layer comprises at least one layer among a hole blocking layer, an electron injection layer, and an electron transport layer, and at least one layer among the hole blocking layer, the electron injection layer, and the electron transport layer comprises a heterocyclic compound represented by Formula 1 and a heterocyclic compound represented by Formula 2.

10. An organic light-emitting device according to claim 1, wherein the organic layer comprises a light-emitting layer, and the light-emitting layer comprises a heterocyclic compound represented by Chemical Formula 1 and a heterocyclic compound represented by Chemical Formula 2.

11. An organic light-emitting device according to claim 1, wherein the organic layer comprises a light-emitting layer, the light-emitting layer comprises a host material, and the host material comprises a heterocyclic compound represented by Chemical Formula 1 and a heterocyclic compound represented by Chemical Formula 2.

12. An organic light-emitting device according to claim 1, wherein the organic light-emitting device further comprises one or more layers selected from the group consisting of a light-emitting layer, a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, an electron blocking layer, and a hole blocking layer.

13. A composition for an organic layer of an organic light-emitting device comprising a heterocyclic compound represented by the following chemical formula 1 and a heterocyclic compound represented by the following chemical formula 2: [Chemical Formula 1] [Chemical Formula 2] In the above chemical formulas 1 and 2, X is O; S; or CRaRb; and, L is a directly bonded; or a substituted or unsubstituted arylene group having 6 to 60 carbon atoms, and l is an integer from 1 to 3, and if l is 2 or greater, L are equal to or different from each other, and A is an aryl ring having 6 to 60 carbon atoms substituted or unsubstituted with deuterium; or a heterocyclic ring having 2 to 60 carbon atoms substituted or unsubstituted with deuterium, and Ra, Rb, Rd, Ar1, Ar3, and Ar4 are each independently hydrogen; deuterium; a halogen group; a cyano group; a substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; a substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; a substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; a substituted or unsubstituted aryl group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms, and Ar2 is a substituted or unsubstituted aryl group having 10 to 60 carbon atoms; or a heteroaryl group having 2 to 60 carbon atoms, and a is an integer from 0 to 4, and if a is 2 or greater, Rd are equal or different, and H is hydrogen, D is deuterium, and, d is an integer from 1 to 6, and The above chemical formula 1 is represented by the following structural formulas A to C, and [Structural Formula A] [Structural Formula B] [Structural Formula C] In the above structural formulas A to C, refers to the positions where they combine with each other, The deuterium content of the above structural formula B is 50% or more and 100% or less, and R1 to R9 are the same or different from one another and each independently hydrogen; deuterium; halogen; cyano group; substituted or unsubstituted alkyl group having 1 to 60 carbon atoms; substituted or unsubstituted alkenyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkynyl group having 2 to 60 carbon atoms; substituted or unsubstituted alkoxy group having 1 to 60 carbon atoms; substituted or unsubstituted cycloalkyl group having 3 to 60 carbon atoms; substituted or unsubstituted heterocycloalkyl group having 2 to 60 carbon atoms; substituted or unsubstituted aryl group having 6 to 60 carbon atoms; substituted or unsubstituted heteroaryl group having 2 to 60 carbon atoms; substituted or unsubstituted phosphine oxide group; Selected from the group consisting of substituted or unsubstituted amine groups, or two or more adjacent groups combine to form a substituted or unsubstituted aromatic hydrocarbon ring having 6 to 60 carbon atoms or a substituted or unsubstituted heterocyclic ring having 2 to 60 carbon atoms, d1 is an integer from 0 to 2, and when d1 is an integer of 2, R9 are the same or different from each other, and L1 and L2 are the same or different from each other and each independently, directly bonded; a substituted or unsubstituted arylene group having 6 to 60 carbon atoms; or a substituted or unsubstituted heteroarylene group having 2 to 60 carbon atoms; and m and n are integers from 0 to 4, and p and q are integers from 1 to 6, and If m, n, p, and q are 2 or more, the substituents within the parentheses are the same or different from each other, and The deuterium content of the above chemical formula 2 is 5% or more and 100% or less.

14. A composition for an organic layer of an organic light-emitting device according to claim 13, wherein the weight ratio of the heterocyclic compound represented by Formula 2 in the composition is higher than the weight ratio of the heterocyclic compound represented by Formula 1.

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