Organic light-emitting device

Abstract

The invention provides an organic electroluminescent device, and belongs to the technical field of organic electroluminescence. According to the organic light-emitting device provided by the invention, the hole transmission region comprises a structure shown in a formula I, and the electron transmission region comprises a structure shown in a formula II, so that the diffusion of electrons / holes transmitted to the light-emitting layer to the hole / electron transmission region can be effectively blocked, and the probability that the holes and the electrons in the light-emitting layer are compounded into excitons is increased; the injection efficiency of carriers (holes and electrons) among interfaces of all the layers is improved, transmission of the carriers among all the layers is balanced, and therefore the light-emitting efficiency of the organic light-emitting device is improved, and the service life of the organic light-emitting device is prolonged. The method has good application effect and industrialization prospect, and can be widely applied to the fields of display devices, lighting devices, solar cells, portable or mobile terminals, navigation terminals, game machines, TVs, computer displays and the like.

Description

Technical Field

[0001] This invention relates to the field of organic electroluminescence technology, and more particularly to an organic electroluminescent device. Background Technology

[0002] Organic light-emitting devices (OLEDs) are self-emissive display devices with wide viewing angles, high contrast and short response times, and exhibit excellent characteristics in terms of brightness, driving voltage and response speed.

[0003] The core of organic electroluminescent devices (OLEDs) is a thin-film structure containing various organic functional materials. Common functionalized organic materials include hole injection materials, hole transport materials, hole blocking materials, electron injection materials, electron transport materials, electron blocking materials, as well as light-emitting host materials and light-emitting guest materials. When an electric current is applied, electrons and holes are injected and transported to the light-emitting region, where they recombine, thereby generating excitons and emitting light. The core organic light-emitting materials in OLED display technology achieve full color gamut by mixing red, green, and blue light-emitting materials. The development of high-performance organic electroluminescent devices is the driving force behind the continuous progress of electroluminescence technology and a research hotspot in the organic electroluminescence industry.

[0004] However, current OLED devices suffer from the following problems: after holes / electrons are transported to the emissive layer, they accumulate and then diffuse into the electron / hole transport region. This reduces the probability of holes and electrons recombinating into excitons in the emissive layer, and the exciton recombination region is deviated from the center of the emissive layer, resulting in a decrease in luminous efficiency. Furthermore, the diffusion of holes / electrons affects device lifetime and reduces device performance. To improve device characteristics, blocking layers are currently used to prevent the movement and diffusion of electrons / holes; however, in practice, satisfactory results have not yet been achieved.

[0005] Overall, the future direction of OLED is to develop high-efficiency, long-life, and low-cost white light devices and full-color display devices. However, the industrialization process of this technology still faces many key issues. How to design better-performing organic electroluminescent devices and optimize the structure of light-emitting devices has always been a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, this invention provides an organic electroluminescent device with high luminous efficiency and long lifespan. Specifically, the technical solution of this invention is as follows: This invention provides an organic electroluminescent device, comprising an anode, a hole transport region, an emissive layer, an electron transport region, and a cathode. The hole transport region is located between the anode and the emissive layer, and the electron transport region is located between the emissive layer and the cathode. The hole transport region includes the structure shown in Formula I, and the electron transport region includes the structure shown in Formula II.

[0007] In Formula I, Ar1 is selected from one of the following groups:

[0008] The z that are the same or different are selected from C or N; R1, R2, and R3 are independently selected from one of hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R1 and R2 can be connected to form a cyclic structure; The L is selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkyl, substituted or unsubstituted C2-C20 heteroarylene; X1 is selected from CR7R8, O, S, or NR9, wherein R7 and R8 are independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C2-C30 heteroaryl; and R9 is selected from one of hydrogen, deuterium, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring, and substituted or unsubstituted C2-C25 heteroaryl. The R hSelected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, fused ring of substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R h They can be connected to form a ring structure; h1 is selected from 0, 1, 2 or 3; h2 is selected from 0, 1, 2, 3 or 4; Z is selected from O or S; The same or different v is selected from C or N; R4 and R5 are independently selected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R4 can be connected to form a cyclic structure, or adjacent R5 can be connected to form a cyclic structure; The value of r is selected from 0, 1, 2, or 3; the value of s is selected from 0, 1, 2, 3, or 4. The Ar2 is selected from one of the following: substituted or unsubstituted C6-C25 aryl groups, substituted or unsubstituted C6-C30 aromatic rings and C3-C30 aliphatic rings fused ring groups, and substituted or unsubstituted C2-C25 heteroaryl groups. L1, L2, and L3 are independently selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkyl, and substituted or unsubstituted C2-C20 heteroarylene. In formula II, A is selected from any of the following structures.

[0009] The R a R b R c The same or different from any one selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; or adjacent R a With R bThey can be linked together to form substituted or unsubstituted C3~C10 aliphatic rings; The x that is the same or different is selected from CR6 or N; the R6 is selected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1~C15 alkyl, substituted or unsubstituted C3~C15 cycloalkyl, substituted or unsubstituted C2~C30 alkenyl, substituted or unsubstituted C6~C25 aryl, substituted or unsubstituted C6~C30 aromatic ring and C3~C30 aliphatic ring fused ring group, substituted or unsubstituted C2~C25 heteroaryl, or adjacent R6 can be connected to form a cyclic structure; The L m Selected from any one of the following: single bond, substituted or unsubstituted C6-C18 arylene groups, substituted or unsubstituted C3-C10 aliphatic rings and C6-C25 aromatic rings, substituted or unsubstituted C2-C20 heteroarylene groups; X2 is selected from CR d R e , O, S or NR f , wherein R d R e Independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; said R f It is selected from one of hydrogen, deuterium, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, and substituted or unsubstituted C2-C25 heteroaryl; The B is selected from the structure shown below.

[0010] The y that is the same or different is selected from CR. k Or N; X3 is selected from O, S, and NR. r Any one of them; The R g R kThe same or different, independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; The R r It is selected from any one of hydrogen, deuterium, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted silyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C2-C30 heteroaryl. The L r L s L t It is independently selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkenes, and substituted or unsubstituted C2-C20 heteroarylene.

[0011] The beneficial effects of this invention are: This invention provides an organic electroluminescent device. The hole transport region of this invention includes a structure of Formula I, and the electron transport region includes a structure of Formula II. These structures can effectively block the diffusion of electrons / holes transmitted to the light-emitting layer into the hole / electron transport region, thereby increasing the probability of holes and electrons recombinating into excitons inside the light-emitting layer and confining the generated excitons within the light-emitting layer. This improves the injection efficiency of charge carriers (holes and electrons) at the interfaces between layers, balances the transport of charge carriers between layers, and thus improves the luminous efficiency and lifespan of the organic electroluminescent device. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0013] In the compounds of this invention, any atom not specified as a particular isotope includes any stable isotope of that atom, and includes atoms at both their natural and non-natural isotopic abundances.

[0014] In this invention, the use of "H" and "hydrogen" refers to the presence of no more than the natural abundance of deuterium or tritium atoms in the chemical structure, for example, no more than 0.0156 atomic% of deuterium. "D" and "deuterium" refer to a deuterium abundance greater than the natural abundance, for example, any value exceeding 0.1 atomic%, 1 atomic%, or 10 atomic%, such as approximately 95 atomic% of deuterium. In this invention, the omission of undrawn hydrogen atoms signifies "H" or "hydrogen".

[0015] The halogens mentioned in this invention refer to fluorine, chlorine, bromine, and iodine.

[0016] The silyl group mentioned in this invention refers to a silane group formed by removing one hydrogen atom from a silane molecule. Preferably, the silyl group has the -Si(R) group. o The structure shown in Figure 3, R o The silyl group is selected from any one of H, substituted or unsubstituted C1-C12 alkyl groups, substituted or unsubstituted C3-C15 cycloalkyl groups, substituted or unsubstituted C6-C30 aryl groups, substituted or unsubstituted C3-C30 alicyclic and C6-C30 aromatic fused and cycloyl groups, and substituted or unsubstituted C2-C30 heteroaryl groups, but is not limited thereto. The substituted silyl group specifically includes trimethylsilyl, triethylsilyl, triisopropylsilyl, tri-tert-butylsilyl, tert-butyldimethylsilyl, vinyldimethylsilyl, propyldimethylsilyl, triphenylsilyl, diphenylsilyl, phenylsilyl, etc., but is not limited thereto. The silyl group is preferably trimethylsilyl, triethylsilyl, triphenylsilyl, diphenylsilyl, or phenylsilyl.

[0017] The alkyl group described in this invention refers to a hydrocarbon group formed by removing one hydrogen atom from an alkane molecule. It can be a straight-chain alkyl group or a branched-chain alkyl group, preferably having 1 to 15 carbon atoms, more preferably 1 to 12 carbon atoms, and particularly preferably 1 to 6 carbon atoms. The straight-chain alkyl group includes methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, undecyl, dodecyl, etc., but is not limited thereto. The branched-chain alkyl group includes isopropyl, isobutyl, sec-butyl, tert-butyl, isomeric groups of n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, etc., but is not limited thereto. The alkyl group is preferably methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, or tert-butyl.

[0018] The cycloalkyl group described in this invention refers to a hydrocarbon group formed by removing one hydrogen atom from a cycloalkane molecule, preferably having 3 to 15 carbon atoms, more preferably 3 to 12 carbon atoms, and particularly preferably 3 to 6 carbon atoms. Examples include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, camphenyl, norbornyl, etc., but are not limited thereto. The alkyl group is preferably cyclopentyl, cyclohexyl, 1-adamantyl, 2-adamantyl, or norbornyl.

[0019] The aryl group described in this invention refers to the general term for a monovalent group remaining after removing a hydrogen atom from the aromatic carbon atom of an aromatic compound molecule. It can be a monocyclic aryl, polycyclic aryl, or fused-ring aryl, preferably having 6 to 25 carbon atoms, more preferably 6 to 20 carbon atoms, and particularly preferably 6 to 14 carbon atoms. The monocyclic aryl refers to an aryl group with only one aromatic ring in the molecule, such as phenyl, but not limited thereto; the polycyclic aryl refers to an aryl group containing two or more independent aromatic rings in the molecule, such as biphenyl, terphenyl, etc., but not limited thereto; the fused-ring aryl refers to an aryl group containing two or more aromatic rings fused together by sharing two adjacent carbon atoms, such as naphthyl, anthracene, phenanthryl, pyrene, peryl, fluorenyl, benzo[a]fluorenyl, triphenylene, fluoranyl, spirodifluorenyl, etc., but not limited thereto. The aryl group is preferably phenyl, biphenyl, terphenyl, naphthyl (preferably 2-naphthyl), anthracene (preferably 2-anthrayl), phenanthryl, pyrene, peryl, fluorene, benzo[a]fluorene, triphenylene, or spirodifluorene.

[0020] The fused ring of aromatic and aliphatic rings described in this invention refers to a molecule containing one or more aromatic rings and one or more aliphatic rings fused together by sharing two adjacent carbon atoms. The aromatic ring preferably has 6 to 30 carbon atoms, more preferably 6 to 18 carbon atoms, and most preferably 6 to 12 carbon atoms. The aliphatic ring preferably has 3 to 30 carbon atoms, more preferably 3 to 18 carbon atoms, more preferably 3 to 12 carbon atoms, and most preferably 3 to 7 carbon atoms. Examples include benzocyclopropane, benzocyclobutane, benzocyclopentane, benzocyclohexane, benzocycloheptane, benzocyclobutenyl, benzocyclopentenyl, benzocyclohexenyl, naphthocyclopropane, naphthocyclobutane, naphthocyclopentane, naphthocyclohexane, naphthocyclopentenyl, naphthocyclohexenyl, etc., but are not limited thereto.

[0021] The heteroaryl group described in this invention refers to the general term for groups obtained by replacing one or more aromatic carbon atoms in an aryl group with heteroatoms. The heteroatoms include, but are not limited to, oxygen, sulfur, nitrogen, or phosphorus atoms, preferably having 1 to 25 carbon atoms, more preferably 2 to 20 carbon atoms, particularly preferably 3 to 15 carbon atoms, and most preferably 3 to 12 carbon atoms. The linking site of the heteroaryl group can be located on a cyclic carbon atom or on a cyclic nitrogen atom. The heteroaryl group can be a monocyclic heteroaryl, a polycyclic heteroaryl, or a fused-ring heteroaryl. The monocyclic heteroaryl groups include, but are not limited to, pyridinyl, pyrimidinyl, triazinyl, furanyl, thiopheneyl, pyrroleyl, imidazolyl, etc.; the polycyclic heteroaryl groups include, but are not limited to, bipyridinyl, bipyrimidinyl, phenylpyridinyl, etc.; the fused-ring heteroaryl groups include, but are not limited to, quinolinyl, isoquinolinyl, indolyl, benzothiopheneyl, benzofuranyl, benzoxazolyl, benzoimidazolyl, benzothiazolyl, dibenzofuranyl, benzodibenzofuranyl, dibenzothiopheneyl, benzodibenzothiapheneyl, carbazolyl, benzocarbazolyl, acridinel, 9,10-dihydroacridinyl, phenoxazinyl, phenthiazinyl, phenoxthiazyl, etc., but are not limited to. The aforementioned heteroaryl groups are preferably pyridyl, pyrimidinyl, thiophene, furanyl, benzothiophene, benzofuranyl, benzooxazolyl, benzoimidazolyl, benzothiazolyl, dibenzofuranyl, dibenzothiophene, benzodibenzothiophene, benzodibenzofuranyl, carbazolyl, acridinel, phenoxazinyl, phenthiazinyl, and phenoxthialyl.

[0022] The alkenyl group described in this invention refers to a monovalent group obtained by removing one hydrogen atom from an olefin molecule. The alkenyl group includes monoalkenyl, dienyl, polyalkenyl, etc. Preferably, it has 2 to 60 carbon atoms, more preferably 2 to 30 carbon atoms, particularly preferably 2 to 15 carbon atoms, and most preferably 2 to 6 carbon atoms. Examples of the alkenyl group include vinyl, butadieneyl, etc., but are not limited thereto. The aforementioned alkenyl group is preferably vinyl.

[0023] The fused ring of aromatic and aliphatic rings described in this invention refers to a molecule containing one or more aromatic rings and one or more aliphatic rings fused together by sharing two adjacent carbon atoms. The aromatic ring preferably has 6 to 30 carbon atoms, more preferably 6 to 18 carbon atoms, and most preferably 6 to 12 carbon atoms. The aliphatic ring preferably has 3 to 30 carbon atoms, more preferably 3 to 18 carbon atoms, more preferably 3 to 12 carbon atoms, and most preferably 3 to 7 carbon atoms. Examples include benzocyclopropane, benzocyclobutane, benzocyclopentane, benzocyclohexane, benzocycloheptane, benzocyclobutenyl, benzocyclopentenyl, benzocyclohexenyl, naphthocyclopropane, naphthocyclobutane, naphthocyclopentane, naphthocyclohexane, naphthocyclopentenyl, naphthocyclohexenyl, etc., but are not limited thereto. The connection sites between the fused rings of aromatic and aliphatic rings and other segments of the compound can be located on either the aromatic or aliphatic rings.

[0024] The arylene group referred to in this invention refers to the general term for the divalent group remaining after removing two hydrogen atoms from the aromatic carbon atom of an aromatic compound molecule. It can be a monocyclic arylene, a polycyclic arylene, or a fused-ring arylene, preferably having 6 to 25 carbon atoms, more preferably 6 to 20 carbon atoms, and particularly preferably 6 to 14 carbon atoms. The monocyclic arylene includes, but is not limited to, phenylene; the polycyclic arylene includes, but is not limited to, biphenylene, terphenylene; the fused-ring arylene includes, but is not limited to, naphthylene, anthracene, phenanthrene, fluorene, pyrene, trimethyleneene, fluorene, phenylfluorene, etc., but is not limited to. The aforementioned arylene groups are preferably phenylene, biphenylene, terphenylene, naphthyl, fluorene, or phenylfluorene.

[0025] The fused aliphatic and aromatic rings and cycloalkanes mentioned in this invention refer to the general term for divalent groups remaining after removing two hydrogen atoms from the fused aliphatic and aromatic rings. Preferably, they have 7 to 30 carbon atoms, more preferably 7 to 18 carbon atoms, and most preferably 7 to 12 carbon atoms. Examples may include, but are not limited to, benzo[a]cyclopropyl, benzo[a]cyclobutyl, benzo[a]cyclopentyl, benzo[a]cyclohexyl, benzo[a]cycloheptyl, benzo[a]cyclopentenyl, benzo[a]cyclohexenyl, benzo[a]cycloheptenyl, naphtho[a]cyclopropyl, naphtho[a]cyclobutyl, naphtho[a]cyclopentyl, and naphtho[a]cyclohexyl, etc.

[0026] The heteroaryl group described in this invention refers to the general term for groups obtained by replacing one or more aromatic carbon atoms in an aryl group with heteroatoms, wherein the heteroatoms include, but are not limited to, oxygen, sulfur, nitrogen, or phosphorus atoms. Preferably, it has 6 to 25 carbon atoms, more preferably 6 to 20 carbon atoms, particularly preferably 6 to 15 carbon atoms, and most preferably 3 to 12 carbon atoms. The linking site of the heteroaryl group can be located on a cyclic carbon atom or a cyclic nitrogen atom. The heteroaryl group can be a monocyclic heteroaryl group, a polycyclic heteroaryl group, or a fused-ring heteroaryl group. The monocyclic heteroaryl group includes, but is not limited to, pyridinyl, pyrimidinyl, triazineyl, furanyl, and thiopheneyl; the polycyclic heteroaryl group includes, but is not limited to, bipyridinyl, bipyrimidinyl, and phenylpyridinyl; the fused-ring heteroaryl group includes, but is not limited to, quinolineyl, isoquinolineyl, indolyl, benzothiopheneyl, benzofuranyl, benzoxazolyl, benzoimidazolyl, benzothiazolyl, dibenzofuranyl, benzofuranyl, dibenzothiapheneyl, benzothiapheneyl, carbazolyl, benzocarbazolyl, acridineyl, phenoxazinyl, phenoxazinyl, phenoxazinyl, phenoxthiazolyl, etc., but is not limited to. The aforementioned heteroaryl groups are preferably pyridinyl, pyrimidinyl, thiopheneyl, furanyl, benzothiopheneyl, benzofuranyl, benzoxazolyl, benzoimidazolyl, benzothiazolyl, dibenzofuranyl, dibenzothiopheneyl, carbazolyl, benzofuranyl, benzothiopheneyl, or acridineyl.

[0027] The term "substituted..." as used in this invention refers to groups such as substituted silyl, substituted alkyl, substituted cycloalkyl, substituted alkenyl, substituted aryl, substituted fused cyclic group of aromatic and aliphatic rings, substituted arylene, substituted fused and cyclic group of aliphatic and aromatic rings, substituted heteroarylene, etc., which are independently selected from, but not limited to, groups such as deuteryl, halogen, cyano, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C3-C30 cycloalkenyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C2-C25 heteroaryl, substituted or unsubstituted amino, substituted or unsubstituted silyl, etc. The group may be monosubstituted or polysubstituted with a group selected from deuteryl, methyl, ethyl, isopropyl, tert-butyl, cyclobutyl, cyclopentyl, cyclohexyl, canyl, norbornelyl, adamantyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, benzo[a]phenanthrene, perylene, pyrene, benzyl, tolyl, fluorenyl, 9,9-dimethylfluorenyl, 9,9-diphenylfluorenyl, 9-methyl-9-phenylfluorenyl, diphenylamino, dimethylamino, carbazolyl, 9-phenylcarbazolyl, acridinel, furanyl, thiophene, benzofuranyl, benzothiophene, benzoxazolyl, benzimidazolyl, benzothiazolyl, dibenzofuranyl, dibenzothiophene, phenothiazinyl, phenothiazinyl, indolyl, trimethylsilyl, and triphenylsilyl. In addition, the above-mentioned substituents may be replaced by one or more substituents selected from deuteryl, halogen atom, cyano, alkyl, cycloalkyl, and aryl.

[0028] Unless otherwise stated, the term "ring" as used herein refers to a fused ring consisting of an aliphatic ring having 3 to 60 carbon atoms, an aromatic ring having 6 to 60 carbon atoms, a heterocyclic ring having 2 to 60 carbon atoms, or a combination thereof, which may contain saturated or unsaturated rings.

[0029] In this specification, when a substituent or linking site lies within a bond that extends through two or more rings, it indicates that the substituent or linking site can be linked to any one of the two or more rings, specifically to any one of the corresponding optional sites within the rings. For example, Can represent or ; Can represent , , . Can represent or And so on.

[0030] In this specification, when the position of the substituent on the aromatic ring is not fixed, it means that it can be attached to any of the corresponding optional sites on the aromatic ring. For example, Can represent , , ; Can represent , , ; Can represent , , , , , , , , , And so on.

[0031] The aliphatic hydrocarbons described in this invention refer to aliphatic hydrocarbons having 1 to 60 carbon atoms, which may be completely unsaturated or partially unsaturated. Preferably, the aliphatic hydrocarbons have 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, even more preferably 1 to 10 carbon atoms, and most preferably 1 to 6 carbon atoms.

[0032] The aliphatic rings described in this invention refer to cyclic hydrocarbons with aliphatic properties, containing closed carbon rings in the molecule. These rings can be monocyclic or polycyclic hydrocarbons formed by 3-18, preferably 3-12, and more preferably 3-7 carbon atoms. They can be completely unsaturated or partially unsaturated, such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclopentene, cyclohexene, cycloheptene, etc., but are not limited thereto. Multiple monocyclic hydrocarbons can also be linked in various ways: two rings in the molecule can share a carbon atom to form a spirocyclic ring; two carbon atoms on a ring can be connected by a carbon bridge to form a bridged ring; several rings can also be interconnected to form a cage-like structure.

[0033] The cyclic structure formed by bonding as described in this invention refers to two groups being linked together by chemical bonds and optionally aromatized. Examples are shown below:

[0034] In this invention, the ring formed by the connection can be a five-membered ring, a six-membered ring, or a fused ring, such as phenyl, naphthyl, cyclopentenyl, cyclopentyl, cyclohexanephenyl, quinolinyl, isoquinolinyl, dibenzothiophene, phenanthrene, or pyrene, but is not limited thereto.

[0035] The organic electroluminescent device of the present invention is typically formed on a substrate. The substrate need not change during the formation of electrodes and organic layers; for example, substrates made of glass, plastic, polymer films, silicon, etc. When the substrate is opaque, the electrodes opposite it are preferably transparent or translucent.

[0036] In the organic electroluminescent device of the present invention, the anode material is preferably formed from metals, alloys, conductive compounds, or mixtures thereof with a high work function (specifically 4.0 eV or higher). Specifically, examples include indium tin oxide (ITO), indium tin oxide containing silicon or silicon oxide, indium zinc oxide, and indium tin oxide (IWZO) containing tungsten oxide and zinc oxide; the conductive compound is, for example, polyaniline, polypyrrole, poly(3-methylthiophene), etc., but is not limited thereto.

[0037] In the organic electroluminescent device of the present invention, the cathode material is preferably a metal, alloy, conductive compound, or mixture thereof with a low work function (specifically below 3.8 eV). Specific examples of such cathode materials include alkali metals such as lithium (Li) or cesium (Cs), elements belonging to Group 1 or Group 2 of the periodic table such as magnesium (Mg), calcium (Ca), and strontium (Sr), alloys containing these elements (MgAg, AlLi), rare earth metals such as europium (Eu) and ytterbium (Yb), and alloys containing these elements, but are not limited thereto.

[0038] The present invention provides an organic electroluminescent device, comprising an anode, a cathode, and an organic layer, wherein the organic layer is located between the anode and the cathode, and the organic layer includes a hole transport region, a light-emitting layer, and an electron transport region.

[0039] Preferably, the hole transport layer comprises the structure shown in Formula I, and the electron transport layer comprises a compound represented by Formula II.

[0040] Preferably, the hole transport layer comprises the structure shown in Formula I, and the hole blocking layer comprises a compound represented by Formula II.

[0041] Preferably, the second hole transport layer (light-emitting auxiliary layer) comprises the structure shown in Formula I, and the electron transport layer comprises a compound represented by Formula II.

[0042] Preferably, the second hole transport layer (light-emitting auxiliary layer) comprises the structure shown in Formula I, and the hole blocking layer comprises a compound represented by Formula II.

[0043] The hole transport region comprises at least one of a hole injection layer, a hole transport layer, an electron blocking layer, and a buffer layer. The hole transport region includes a hole transport layer, which can be single-layered, two-layered, three-layered, four-layered, five-layered, six-layered, or more layers. Specifically, the hole transport layer can sequentially include a first hole transport layer, a second hole transport layer, a third hole transport layer, a fourth hole transport layer, a fifth hole transport layer, a sixth hole transport layer, or more layers. The first hole transport layer is located between the anode and the light-emitting layer, the second hole transport layer is located between the first hole transport layer and the light-emitting layer, and so on.

[0044] The hole transport region may include multiple single-layer structures of different materials, such as a hole injection layer / hole transport layer structure, a hole injection layer / hole transport layer / buffer layer structure, a hole injection layer / buffer layer structure, a hole transport layer / buffer layer structure, a hole injection layer / hole transport layer / electron blocking layer structure, or a hole injection layer / electron blocking layer structure, wherein the layers of each structure are stacked sequentially from the anode in the order described, but the structure of the hole transport region is not limited to this.

[0045] Each layer in the hole transport region may include different materials, such as one compound, two compounds, three compounds, or more compounds. The compounds may be one or more of the same type or one or more of different types.

[0046] In the organic electroluminescent device of the present invention, the hole injection material can be one that possesses the ability to transport holes, exhibits excellent hole injection effect from the anode, and provides excellent hole injection effect for the light-emitting layer or light-emitting material. It also prevents excitons generated in the light-emitting layer from migrating to the electron injection layer or electron injection material, and has excellent thin film formation capability. Preferably, the HOMO (highest occupied molecular orbital) of the hole injection material is between that of the anode material and the HOMO of the surrounding organic layer. Specific examples of hole injection materials include metalloporphyrins, oligothiophenes, arylamine-based organic compounds, hexanitrile hexaazabenzophenanthrene-based organic compounds, quinacridone-based organic compounds, perylene-based organic compounds, anthraquinones, and conductive polymers such as polyaniline and polythiophene, but are not limited to these.

[0047] In the organic electroluminescent device of the present invention, the hole transport layer material is preferably a substance with high hole mobility. Specific examples include aryl amine-based organic compounds, conductive polymers, and block copolymers containing both conjugated and non-conjugated portions, but these are not limited to these. Preferably, the hole transport layer comprises the structure shown in Formula I.

[0048] An electron blocking layer is a layer that prevents holes injected from the hole injection layer from passing through the light-emitting layer and entering the electron injection layer, thereby improving the lifespan and efficiency of the device. If necessary, a suitable portion between the light-emitting layer and the electron injection layer can be formed using known materials. Preferably, the electron blocking layer comprises the structure shown in Formula I.

[0049] Preferably, the hole transport region includes the structure shown in Formula I.

[0050] Preferably, the first hole transport layer comprises a compound represented by formula I.

[0051] Preferably, the second hole transport layer (light-emitting auxiliary layer) comprises a compound represented by general formula I.

[0052] Preferably, the first hole transport layer comprises a compound represented by formula I, and the second hole transport layer (light-emitting auxiliary layer) comprises a compound represented by formula I.

[0053] Preferably, the thickness of the first hole transport layer is 50 nm to 200 nm, and the thickness of the second hole transport layer (light-emitting auxiliary layer) is 3 nm to 100 nm.

[0054] Preferably, the thickness of the first hole transport layer is 60 nm to 180 nm.

[0055] More preferably, the thickness of the first hole transport layer is 80 nm to 140 nm.

[0056] More preferably, the thickness of the first hole transport layer is 100 nm to 120 nm.

[0057] Preferably, the thickness of the second hole transport layer (light-emitting auxiliary layer) is 5 nm to 90 nm.

[0058] More preferably, the thickness of the second hole transport layer (light-emitting auxiliary layer) is 40nm~80nm (red light device); the thickness of the second hole transport layer (light-emitting auxiliary layer) is 20nm~60nm (green light device); and the thickness of the second hole transport layer (light-emitting auxiliary layer) is 5nm~30nm (blue light device).

[0059] More preferably, the thickness of the second hole transport layer (light-emitting auxiliary layer) is 50nm~70nm (red light device); the thickness of the second hole transport layer (light-emitting auxiliary layer) is 30nm~50nm (green light device); and the thickness of the second hole transport layer (light-emitting auxiliary layer) is 5nm~25nm (blue light device).

[0060]

[0061] Wherein, Ar1 is selected from one of the following groups:

[0062] The z that are the same or different are selected from C or N; R1, R2, and R3 are independently selected from one of hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R1 and R2 can be connected to form a cyclic structure; The L is selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkyl, substituted or unsubstituted C2-C20 heteroarylene; X1 is selected from CR7R8, O, S, or NR9, wherein R7 and R8 are independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C2-C30 heteroaryl; and R9 is selected from one of hydrogen, deuterium, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring, and substituted or unsubstituted C2-C25 heteroaryl. The R h Selected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, fused ring of substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R h They can be connected to form a ring structure; h1 is selected from 0, 1, 2 or 3; h2 is selected from 0, 1, 2, 3 or 4; Z is selected from O or S; The same or different v is selected from C or N; R4 and R5 are independently selected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R4 can be connected to form a cyclic structure, or adjacent R5 can be connected to form a cyclic structure; The value of r is selected from 0, 1, 2, or 3; the value of s is selected from 0, 1, 2, 3, or 4. The Ar2 is selected from one of the following: substituted or unsubstituted C6-C25 aryl groups, substituted or unsubstituted C6-C30 aromatic rings and C3-C30 aliphatic rings fused ring groups, and substituted or unsubstituted C2-C25 heteroaryl groups. L1, L2, and L3 are independently selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkenes, and substituted or unsubstituted C2-C20 heteroarylene.

[0063] Preferably, the Ar1 is selected from any one of the following structures:

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077]

[0078]

[0079]

[0080]

[0081]

[0082] The z that are the same or different are selected from C or N; The R h The same or different from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted isopropyl, substituted or unsubstituted tert-butyl, substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted norbornel, substituted or unsubstituted adamantyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted pyridyl, substituted or unsubstituted pyrimidinyl, etc. The substituent is selected from any one of the following: substituted or unsubstituted triazine, substituted or unsubstituted pyrazine, substituted or unsubstituted quinolinyl, substituted or unsubstituted isoquinolinyl, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, substituted or unsubstituted benzofuranyl, substituted or unsubstituted benzothiophenyl, substituted or unsubstituted indolyl, wherein the substituent is selected from one or more of the following: deuterium, cyano, methyl, ethyl, isopropyl, tert-butyl, cyclobutyl, cyclopentyl, cyclohexyl, norbornelalkyl, adamantylalkyl, phenyl, deuterated phenyl, biphenyl, terphenyl, tolyl, and naphthyl. The R f It is selected from any one of hydrogen, deuterium, trimethylsilyl, triphenylsilyl, triethylsilyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, deuterated phenyl, methylphenyl, biphenyl, deuterated biphenyl, naphthyl, indene, indanyl, benzofuranyl, benzothiophene, indolyl, pyridyl, pyrimidinyl, triazinyl, quinolinyl, isoquinolinyl, quinazolinyl, and quinoxalinyl; The L is selected from any one of the following: single bond, substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene, substituted or unsubstituted terphenylene, substituted or unsubstituted naphthylene, substituted or unsubstituted pyridylene, substituted or unsubstituted pyrimidinylene, substituted or unsubstituted triazineylene, substituted or unsubstituted pyridazineylene, substituted or unsubstituted pyridazineylene, substituted or unsubstituted quinolinylene, substituted or unsubstituted isoquinolinylene, substituted or unsubstituted quinazolinylene, substituted or unsubstituted quinoxalinylene, substituted or unsubstituted benzofuranylene, substituted or unsubstituted benzothiophenylene, and substituted or unsubstituted indoleylene. The values ​​of h0 (which may be the same or different) are selected from 0, 1, 2, 3, 4, or 5; the values ​​of h1 (which may be the same or different) are selected from 0, 1, 2, or 3; the values ​​of h2 (which may be the same or different) are selected from 0, 1, 2, 3, or 4; the values ​​of h3 (which may be the same or different) are selected from 0, 1, 2, 3, 4, 5, 6, or 7; the values ​​of h4 (which may be the same or different) are selected from 0, 1, 2, 3, 4, 5, or 6; the values ​​of h5 (which may be the same or different) are selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8. Or 9; the same or different h6 is selected from 0, 1, 2, 3, 4, 5, 6, 7 or 8; the same or different h7 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11; the same or different h8 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; the same or different h9 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12; the h 10 The same or different values ​​are selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14; when there are two or more R values. h At that time, two or more R h They may be the same as or different from each other.

[0083] Preferably, the Ar2 is selected from any one of the following structures:

[0084] Wherein, Y is selected from O, S or NR. y The R y It is selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 silyl, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl. The t is selected from CR n Or N atoms; V is selected from O, S, NR u or CR v R w The R uSelected from one of hydrogen, deuterium, substituted or unsubstituted C1-C30 silyl groups, substituted or unsubstituted C1-C30 alkyl groups, substituted or unsubstituted C3-C30 cycloalkyl groups, substituted or unsubstituted C6-C60 aryl groups, and substituted or unsubstituted C3-C60 heteroaryl groups; or R u The corresponding nitrogen atom is the site connected to the bridging L2; The R v R w Independently selected from hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, or one of the following substituted or unsubstituted groups: silyl, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornel, camphenyl, phenyl, biphenyl, terphenyl, naphthyl, tetrahydronaphthyl, dihydronaphthyl, indanyl, indole, pyridyl, pyrazinyl, pyridazinyl, triazinyl, quinolinyl, isoquinolinyl, quinoxalinyl, quinazolinyl, benzolinyl, benzofuranyl, benzothiopheneyl, indolyl, dibenzofuranyl, dibenzothiopheneyl, 9-phenylcarbazoyl, methylfluorenyl, phenylfluorenyl, spirofluorenyl, or adjacent R v R w Groups can bond together to form substituted or unsubstituted cyclic structures; or R v R w The carbon atom corresponding to one of them is the site connected to bridge L2; The u that is the same or different is selected from CR n Or N atoms, and at least one u is selected from N atoms, wherein R n Identical or different from each other, selected from hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, or substituted or unsubstituted groups of the following: silyl, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantyl, norbornyl, tetrahydronaphthyl, dihydronaphthyl, indanyl, indenyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, triphenylene, pyrene, pyridyl, pyrazinyl, pyridazinyl, tri- The substituents are selected from one or more of the following: azinoyl, quinolinyl, isoquinolinyl, quinoxalinyl, quinazolinyl, cenolinyl, benzofuranyl, benzothiophenyl, and indoleyl; wherein the substituent in "substituted or unsubstituted" is selected from deuterium, tritium, cyano, halogen, trifluoromethyl, methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantyl, norbornel, phenyl, biphenyl, and naphthyl, or optionally two adjacent R groups. nGroups can bond together to form substituted or unsubstituted benzene rings, substituted or unsubstituted naphthalene rings, substituted or unsubstituted pyridine rings, substituted or unsubstituted pyrimidine rings, substituted or unsubstituted pyridazine rings, substituted or unsubstituted pyrazine rings, or substituted or unsubstituted tri- to octet aliphatic rings; in the case of being substituted by multiple substituents, the multiple substituents may be the same as or different from each other; The n1 is selected from 1, 2, 3, 4 or 5; the n2 is selected from 1, 2, 3 or 4.

[0085] More preferably, the Ar2 is selected from any one of the following groups:

[0086]

[0087]

[0088]

[0089]

[0090]

[0091]

[0092]

[0093]

[0094]

[0095]

[0096]

[0097] The R m The substituents, whether identical or different from each other, are selected from hydrogen, deuterium, tritium, cyano, fluorine, trifluoromethyl, or substituted or unsubstituted groups of the following: silyl, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornyl, phenyl, biphenyl, terphenyl, naphthyl; wherein the substituents in "substituted or unsubstituted" are selected from one or more of deuterium, cyano, fluorine, trifluoromethyl, trimethylsilyl, triphenylsilyl, methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl, hexyl, cyclopentyl, cyclohexyl, adamantyl, norbornyl, phenyl, biphenyl, naphthyl, and in the case of being substituted by multiple substituents, the multiple substituents are identical or different from each other; The n0 is selected from 1; the n1 is selected from 1, 2, 3, 4, or 5; the n2 is selected from 1, 2, 3, or 4; the n3 is selected from 1, 2, or 3; the n4 is selected from 1 or 2; the n5 is selected from 1, 2, 3, 4, 5, 6, or 7; the n6 is selected from 1, 2, 3, 4, 5, 6, 7, 8, or 9; the n7 is selected from 1, 2, 3, 4, 5, or 6; the n8 is selected from 1, 2, 3, 4, 5, 6, 7, or 8; the n9 is selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10; n 10 Choose from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11.

[0098] Preferably, the R of the present invention v R w The group is independently selected from hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, and one of the following groups, substituted or unsubstituted: silyl, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornel, phenyl, biphenyl, terphenyl, naphthyl, tetrahydronaphthyl, dihydronaphthyl, indanyl, indenyl, pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, quinolinyl, isoquinoline. The substituents in "substituted or unsubstituted" are selected from one or more of the following: deuterium, cyano, fluorine, trifluoromethyl, trimethylsilyl, triphenylsilyl, methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl, hexyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornel, phenyl, biphenyl, naphthyl, deuterated phenyl, deuterated biphenyl, and deuterated naphthyl.

[0099] Preferably, the R of the present invention n The groups are either identical or different from each other, and are selected from hydrogen, deuterium, tritium, cyano, fluorine, trifluoromethyl, or substituted or unsubstituted groups of the following: silyl, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornyl, tetrahydronaphthyl, dihydronaphthyl, indenyl, indenyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, triphenylene, pyrene, pyridyl, pyrimidinyl; wherein the substituents in "substituted or unsubstituted" are selected from one or more of deuterium, tritium, cyano, fluorine, trifluoromethyl, trimethylsilyl, triphenylsilyl, methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl, hexyl, heptyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornyl, phenyl, biphenyl, naphthyl, or optionally two adjacent R groups. n Groups can bond together to form substituted or unsubstituted benzene rings or substituted or unsubstituted five- or six-membered aliphatic rings; when substituted by multiple substituents, the substituents may be the same as or different from each other.

[0100] Preferably, the R of the present invention u Selected from the following groups, whether substituted or unsubstituted: methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornel, camphenyl, trimethylsilyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, phenylenetriethylene, dibenzofuranyl, dibenzothiophene, 9,9-dimethylfluorenyl, 9,9-diphenylfluorenyl, spirofluorenyl, 9-phenylcarbazoyl, tetrahydronaphthyl, dihydronaphthyl, The substituent is selected from one of indanyl, indole, pyridyl, pyrazinyl, pyridazinyl, and triazinyl; wherein the substituent in "substituted or unsubstituted" is selected from one or more of deuterium, cyano, halogen, trifluoromethyl, trimethylsilyl, methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl, hexyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornel, phenyl, biphenyl, naphthyl, deuterated phenyl, deuterated biphenyl, and deuterated naphthyl.

[0101] More preferably, the R u It is selected from one of methyl, ethyl, isopropyl, tert-butyl, cyclopentyl, cyclohexyl, adamantyl, norbornel, camphenyl, trimethylsilyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, triphenylene, tetrahydronaphthyl, dihydronaphthyl, indanyl, indole, deuterated phenyl, deuterated biphenyl, and deuterated naphthyl.

[0102] Preferably, L1, L2, and L3 are independently selected from single bonds or any one of the following groups, or a combination of two or more of the following groups:

[0103] The r is selected from either CH or N; The Y a Y b Independently selected from O, S, N(R) w Any one of the following; The Y c Selected from O, S, C(R) p R q ), N(R v Any one of the following; The ring B is selected from substituted or unsubstituted C3~C10 alicyclic rings; The R z R z'Independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C1-C25 heterocyclic alkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl, substituted or unsubstituted C3-C30 alicyclic and C6-C30 aromatic ring fused cycloyl, substituted or unsubstituted C1-C25 heterocyclic alkane and C6-C30 aromatic ring fused cycloyl, substituted or unsubstituted C3-C25 alicyclic and C2-C30 heteroaromatic ring fused cycloyl; The R p R q Independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C1-C25 heterocycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl, or R p R q The links between them form substituted or unsubstituted rings; The R w R v It is independently selected from any one of hydrogen, deuterium, tritium, substituted or unsubstituted silyl, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C25 cycloalkyl, substituted or unsubstituted C1-C25 heterocycloalkyl, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C2-C30 heteroaryl; p is selected from 1, 2, 3, or 4; z1 is selected from 0, 1, 2, 3, or 4; z2 is selected from 0, 1, 2, 3, 4, 5, or 6; z3 is selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8; z4 is selected from 0, 1, or 2; when there are two or more R... z At that time, two or more R z The same or different between each other, or two adjacent R z They connect with each other to form substituted or unsubstituted rings; The z'1 is selected from 0, 1, or 2; when there are two or more R z At that time, two or more R z 'They are the same as or different from each other.'

[0104] More preferably, L1, L2, and L3 are independently selected from single bonds or from any one of the following groups or from a combination of two or more of the following groups:

[0105]

[0106]

[0107]

[0108]

[0109] The R z R z Independently selected from hydrogen, deuterium, tritium, halogen, cyano, nitro, and the following substituted or unsubstituted groups: methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, cyclopropyl, benzocyclopropyl, naphthocyclopropyl, cyclobutyl, benzocyclobutyl, naphthocyclobutyl, cyclopentyl, benzocyclopentyl, naphthocyclopentyl, cyclohexyl, benzocyclohexyl, naphthocyclohexyl, cycloheptyl, benzocycloheptyl, adamantyl, norbornel, trimethylsilyl, triethylsilyl, tetrahydropyrrolyl, piperidinyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, phenylenetriene, pyrene, perylene, fluorenyl, spirofluorenyl, fluoranyl, pyridyl, pyrimidinyl, pyrazine The following are all of the following: yl, pyridazinyl, triazinyl, furanyl, benzofuranyl, dibenzofuranyl, benzodibenzofuranyl, thiophenyl, benzothiophenyl, dibenzothiophenyl, benzodibenzothiophenyl, carbazoleyl, benzocarbazoleyl, pyrroleyl, oxazolyl, benzooxazolyl, dibenzooxazolyl, thiazolyl, benzothiazolyl, dibenzothiazolyl, imidazolyl, benzoimidazolyl, dibenzoimidazolyl, quinolinyl, benzoquinolinyl, isoquinolinyl, benzoisoquinolinyl, quinazolinyl, benzoquinazolinyl, quinoxolinyl, benzoquinoxolinyl, quinoxolinyl, benzoquinoxolinyl, quinoxolinyl, benzoquinoxolinyl, phenantholinyl, naphridinyl, indolyl, acridineyl, phenoxazinyl, phenthiazinyl, spirofluoroxanthenyl, spirofluoroxanthenyl; The R p R q The group is independently selected from hydrogen, deuterium, tritium, halogen, cyano, nitro, or any of the following substituted or unsubstituted groups: methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, cyclopropyl, benzocyclopropyl, naphthocyclopropyl, cyclobutyl, benzocyclobutyl, naphthocyclobutyl, cyclopentyl, benzocyclopentyl, naphthocyclopentyl, cyclohexyl, benzocyclohexyl, naphthocyclohexyl, cycloheptyl, benzocycloheptyl, adamantyl, norbornel, trimethylsilyl, triethylsilyl, tetrahydropyrrolyl, piperidinyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, triphenylene, pyrene, perylene, fluorenyl, spirofluorenyl, fluoranyl, pyridinyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl; The R w R vThe group is independently selected from hydrogen, deuterium, tritium, or any of the following substituted or unsubstituted groups: methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, cyclopropyl, benzocyclopropyl, naphthocyclopropyl, cyclobutyl, benzocyclobutyl, naphthocyclobutyl, cyclopentyl, benzocyclopentyl, naphthocyclopentyl, cyclohexyl, benzocyclohexyl, naphthocyclohexyl, cycloheptyl, benzocycloheptyl, adamantyl, norbornyl, trimethylsilyl, triethylsilyl, tetrahydropyrrolyl, piperidinyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, triphenylene, pyrene, perylene, fluorenyl, spirofluorenyl, fluoranyl, pyridinyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl; z'1 is selected from 0, 1, or 2; z'2 is selected from 0, 1, 2, 3, or 4; z'3 is selected from 0, 1, 2, 3, 4, 5, or 6; z'4 is selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8; z'5 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10; when there are two or more R z At that time, two or more R z 'They are the same as or different from each other.'

[0110] Preferably, in each six-membered ring of the group, at most two r are selected from N, or at most one r is selected from N.

[0111] Preferably, at most two r groups in each group are selected from N, or at most one r group is selected from N.

[0112] Most preferably, the compound represented by Formula I is selected from any one of the following chemical structures:

[0113]

[0114]

[0115]

[0116]

[0117]

[0118]

[0119]

[0120]

[0121]

[0122]

[0123]

[0124]

[0125]

[0126]

[0127]

[0128]

[0129]

[0130]

[0131]

[0132]

[0133]

[0134]

[0135]

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142]

[0143]

[0144]

[0145]

[0146]

[0147]

[0148]

[0149]

[0150]

[0151]

[0152]

[0153]

[0154]

[0155]

[0156]

[0157]

[0158]

[0159]

[0160]

[0161]

[0162]

[0163]

[0164]

[0165]

[0166]

[0167]

[0168]

[0169]

[0170]

[0171]

[0172]

[0173]

[0174]

[0175]

[0176]

[0177]

[0178]

[0179]

[0180]

[0181]

[0182]

[0183]

[0184]

[0185]

[0186]

[0187]

[0188]

[0189]

[0190]

[0191]

[0192]

[0193]

[0194]

[0195]

[0196]

[0197]

[0198]

[0199]

[0200]

[0201]

[0202]

[0203]

[0204]

[0205]

[0206]

[0207]

[0208]

[0209]

[0210]

[0211]

[0212]

[0213]

[0214]

[0215]

[0216]

[0217]

[0218]

[0219]

[0220]

[0221]

[0222]

[0223]

[0224]

[0225]

[0226]

[0227]

[0228]

[0229]

[0230]

[0231]

[0232]

[0233]

[0234]

[0235]

[0236]

[0237]

[0238]

[0239]

[0240]

[0241]

[0242]

[0243]

[0244]

[0245]

[0246]

[0247]

[0248]

[0249]

[0250]

[0251]

[0252]

[0253]

[0254]

[0255]

[0256]

[0257]

[0258]

[0259]

[0260]

[0261]

[0262]

[0263]

[0264]

[0265]

[0266]

[0267]

[0268]

[0269]

[0270]

[0271]

[0272]

[0273]

[0274]

[0275]

[0276]

[0278] The luminescent layer is a layer containing a highly luminescent material (doped material), and various materials can be used. For example, fluorescent luminescent materials and phosphorescent luminescent materials can be used as doped materials. Fluorescent luminescent materials are compounds that emit light from a singlet excited state, while phosphorescent luminescent materials are compounds that emit light from a triplet excited state.

[0279] In the organic electroluminescent device of the present invention, the light-emitting layer may comprise a host material and a dopant material. The host material may be (1) metal complexes such as aluminum complexes, beryllium complexes, or zinc complexes; (2) heterocyclic compounds such as oxadiazole derivatives, benzimidazole derivatives, or phenanthroline derivatives; (3) fused aromatic compounds such as carbazole derivatives, anthracene derivatives, phenanthrene derivatives, or pyrene derivatives; or (4) aromatic amine compounds such as triarylamine derivatives or fused polycyclic aromatic amine derivatives. The host material may have a single layer formed using a single material, a single layer formed using multiple different materials, or a multilayer structure comprising multiple layers formed using multiple different materials.

[0280] In the organic electroluminescent device of the present invention, the doping material includes aromatic amine derivatives, styrene-based heterocyclic aromatic amine compounds, boron complexes, fluoranthene compounds, and metal complexes. Specifically, as aromatic amine derivatives, they are aromatic fused-ring derivatives having substituted or unsubstituted arylamine groups, such as pyrene, anthracene, and diindronepyrene. As styrene-based heterocyclic aromatic amine compounds, they are compounds in which at least one aryl vinyl group is substituted on a substituted or unsubstituted arylamine, and is substituted or unsubstituted by one or more substituents selected from aryl, silyl, alkyl, cycloalkyl, and arylamine groups. Specifically, they include styrene-based amines, styrene-based diamines, styrene-based triamines, and styrene-based tetraamines, but are not limited thereto. In addition, as metal complexes, they include iridium complexes and platinum complexes, but are not limited thereto. The doping material can be a single structure composed of a single substance, or a single-layer or multi-layer structure formed by different substances.

[0281] The optimal doping ratio of the host material and guest material of the light-emitting layer can vary depending on the material used. Typically, the doping ratio of the guest material of the light-emitting layer is 0.01% to 20%, preferably 0.1% to 15%, and more preferably 1% to 10%.

[0282] The electron transport region may include at least one of the following: an electron injection layer, an electron transport layer, a buffer layer, and a hole blocking layer. It can be a single structure composed of a single material, or a single-layer or multi-layer structure formed from different materials. The electron transport layer may be a single layer, or it may include a first electron transport layer, a second electron transport layer, or more layers. The type of electron transport region may be an electron injection layer / electron transport layer structure, an electron injection layer / electron transport layer / buffer layer structure, an electron injection layer / buffer layer structure, an electron transport layer / buffer layer structure, or an electron injection layer / electron transport layer / hole blocking layer structure, wherein the layers of each structure are stacked sequentially from the cathode in the order described, but the structure of the electron transport region is not limited to this.

[0283] In the organic electroluminescent device of the present invention, the electron transport material can be selected from 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 1,3,5-tris(N-phenyl-2-benzimidazole)benzene (TPBi), tris(8-hydroxyquinoline)aluminum(III) (Alq3), 8-hydroxyquinoline-lithium (Liq), di(2-methyl-8-hydroxyquinoline)(4-phenylphenol)aluminum(III) (BAlq), and 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole (TAZ), 4,7-diphenyl-1,10-phenanthroline (Bphen), etc. In addition to the above materials and combinations thereof, the electron transport material may also include other known materials suitable for electron transport layers. Preferably, the electron transport layer comprises the structure shown in Formula II.

[0284] In the organic electroluminescent device of the present invention, the electron injection material can be selected from one or more combinations of LiQ, LiF, NaCl, CsF, Li₂O, Cs₂CO₃, BaO, Na, Li, and Ca. In addition to the above materials and combinations thereof, the electron injection material may also include other known materials suitable for serving as the electron injection layer. Preferably, the electron injection layer of the present invention is selected from LiQ, LiF, etc.

[0285] A hole blocking layer is a layer that prevents holes from reaching the cathode, and it can generally be formed using the same conditions as a hole injection layer. Specifically, it can be a diazole or triazole derivative, a phenanthrene-rholine derivative, BCP, an aluminum complex, etc., but is not limited to these. Preferably, the hole blocking layer includes the structure shown in Formula II.

[0286] Preferably, the electron transmission region includes the structure shown in Formula II.

[0287] Preferably, the electron transport layer comprises a compound represented by general formula II.

[0288] Preferably, the hole-blocking layer comprises a compound represented by general formula II.

[0289] Preferably, the electron transport layer comprises a compound represented by general formula II, and the hole blocking layer comprises a compound represented by general formula II.

[0290] Preferably, the thickness of the electron transport layer is 10 nm to 60 nm, and the thickness of the hole blocking layer is 5 nm to 50 nm.

[0291] More preferably, the thickness of the electron transport layer is 20 nm to 50 nm.

[0292] More preferably, the thickness of the electron transport layer is 20 nm to 40 nm.

[0293] Preferably, the thickness of the hole blocking layer is 5 nm to 40 nm.

[0294]

[0295] Wherein, A is selected from any of the structures shown below.

[0296] The R a R b R c The same or different from any one selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; or adjacent R a With R b They can be linked together to form substituted or unsubstituted C3~C10 aliphatic rings; The x that is the same or different is selected from CR6 or N; the R6 is selected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1~C15 alkyl, substituted or unsubstituted C3~C15 cycloalkyl, substituted or unsubstituted C2~C30 alkenyl, substituted or unsubstituted C6~C25 aryl, substituted or unsubstituted C6~C30 aromatic ring and C3~C30 aliphatic ring fused ring group, substituted or unsubstituted C2~C25 heteroaryl, or adjacent R6 can be connected to form a cyclic structure; The L m Selected from any one of the following: single bond, substituted or unsubstituted C6-C18 arylene groups, substituted or unsubstituted C3-C10 aliphatic rings and C6-C25 aromatic rings, substituted or unsubstituted C2-C20 heteroarylene groups; X2 is selected from CR d R e, O, S or NR f , wherein R d R e Independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; said R f It is selected from one of hydrogen, deuterium, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, and substituted or unsubstituted C2-C25 heteroaryl; The B is selected from the structure shown below.

[0297] The y that is the same or different is selected from CR. k Or N; X3 is selected from O, S, and NR. r Any one of them; The R g R k The same or different, independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; The R r It is selected from any one of hydrogen, deuterium, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted silyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C2-C30 heteroaryl. The L r L s L t It is independently selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkenes, and substituted or unsubstituted C2-C20 heteroarylene.

[0298] Preferably, the structure of Formula II is selected from any one of the structures shown in Formulas 2-1 to 2-8 below.

[0299] .

[0300] Preferably, A is selected from any of the following structures.

[0301]

[0302]

[0303]

[0304]

[0305]

[0306]

[0307]

[0308]

[0309]

[0310]

[0311]

[0312]

[0313]

[0314]

[0315] The x that is the same or different is selected from CR6 or N; The R6, R 10The same or different from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted isopropyl, substituted or unsubstituted tert-butyl, substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted norbornel, substituted or unsubstituted adamantyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted pyridyl, substituted or unsubstituted pyrimidinyl, etc. The substituent is selected from any one of the following: substituted or unsubstituted triazine, substituted or unsubstituted pyrazine, substituted or unsubstituted quinolinyl, substituted or unsubstituted isoquinolinyl, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, substituted or unsubstituted benzofuranyl, substituted or unsubstituted benzothiophenyl, substituted or unsubstituted indolyl, wherein the substituent is selected from one or more of the following: deuterium, cyano, methyl, ethyl, isopropyl, tert-butyl, cyclobutyl, cyclopentyl, cyclohexyl, norbornelalkyl, adamantylalkyl, phenyl, deuterated phenyl, biphenyl, terphenyl, tolyl, and naphthyl. The R f It is selected from any one of hydrogen, deuterium, trimethylsilyl, triphenylsilyl, triethylsilyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, deuterated phenyl, methylphenyl, biphenyl, deuterated biphenyl, naphthyl, indene, indanyl, benzofuranyl, benzothiophene, indolyl, pyridyl, pyrimidinyl, and triazineyl; The same or different d1 is selected from 0, 1, 2, 3, 4 or 5; the same or different d2 is selected from 0, 1, 2, 3 or 4; the same or different d3 is selected from 0, 1, 2, 3, 4, 5, 6 or 7; the same or different d4 is selected from 0, 1, 2, 3, 4, 5 or 6; the same or different d5 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9; the same or different d6 is selected from 0, 1, 2, 3, 4, 5, 6, 7 or 8; the same or different d7 is selected from 0, 1, 2 or 3; the same or different d8 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11; the same or different d9 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; the d 10 The same or different values ​​are selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12; the d 11 The same or different values ​​are selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14; when there are two or more R values. 10 At that time, two or more R 10 They may be the same as or different from each other.

[0316] Preferably, in each six-membered ring of the group, at most two x are selected from N, or at most one x is selected from N.

[0317] Preferably, at most two x groups in each group are selected from N, or at most one x group is selected from N.

[0318] Preferably, B is selected from any of the following structures:

[0319] X3 is selected from O, S, and NR. r Any one of them; The R r Selected from any one of the following groups, which are hydrogen, deuterium, substituted or unsubstituted: silyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, tolyl, deuterated phenyl, biphenyl, terphenyl, naphthyl, pyridyl, pyrimidinyl, triazinyl, pyrazinyl, quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, benzofuranyl, benzothiopheneyl, and indoleyl; The R g R k The same or different, independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, silyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, tolyl, deuterated phenyl, biphenyl, terphenyl, naphthyl, pyridinyl, pyrimidinyl, triazinyl, pyrazinyl, quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, benzofuranyl, benzothiopheneyl, indolyl, dibenzofuranyl, dibenzothiopheneyl, 9-phenylcarbazoyl, methylfluorenyl, phenylfluorenyl, and spirofluorenyl; The R g R k It can be substituted by one or more substituents, wherein the same or different substituents are selected from any one of deuterium, halogen, cyano, nitro, trimethylsilyl, triphenylsilyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, biphenyl, naphthyl, pyridyl, pyrimidinyl, benzofuranyl, benzothiophenyl, and indoleyl; when two or more substituents are present, the two or more substituents are the same or different from each other; The m1 that is the same or different is selected from 0, 1, 2, 3, or 4; the m2 that is the same or different is selected from 0, 1, 2, 3, 4, 5, or 6; the m3 that is the same or different is selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8; the m4 that is the same or different is selected from 0, 1, 2, or 3; the m5 that is the same or different is selected from 0, 1, 2, 3, 4, or 5; the m6 that is the same or different is selected from 0, 1, 2, 3, 4, 5, 6, or 7; the m7 that is the same or different is selected from 0, 1, or 2; the m8 that is the same or different is selected from 0 or 1; when there are two or more R k At that time, two or more R k They may be the same as or different from each other.

[0320] Preferably, the L r L s L t The same or different from one of the single-bonded groups, as shown below, and combinations thereof:

[0321]

[0322] The R s They may be the same as or different from each other, and are selected from any one of hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C2-C25 heteroaryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group; r0 is selected from 0, 1, or 2; r1 is selected from 0, 1, 2, 3, or 4; r2 is selected from 0, 1, 2, 3, 4, 5, or 6; r3 is selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8; r4 is selected from 0, 1, 2, or 3; r5 is selected from 0 or 1. The R x R y The group is independently selected from hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, or substituted or unsubstituted of the following groups: methyl, ethyl, n-propyl, n-butyl, isopropyl, tert-butyl, cyclohexyl, cyclopentyl, cyclobutyl, cyclopropyl, adamantyl, norbornel, phenyl, naphthyl, anthracene, phenanthrene, triphenylene, dibenzofuranyl, dibenzothiophene, 9,9-dimethylfluorenyl, 9,9-diphenylfluorenyl, spirofluorenyl, 9-phenylcarbazoyl, tetrahydronaphthyl, dihydronaphthyl, indanyl, and indanyl.

[0323] More preferably, the R sThe group is selected, either identically or differently, from hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, or substituted or unsubstituted groups of the following: methyl, ethyl, propyl, butyl, pentyl, hexyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornel, tetrahydronaphthyl, dihydronaphthyl, indanyl, indenyl, phenyl, biphenyl, terphenyl, naphthyl, pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, where, in the case of substitution by multiple substituents, the multiple substituents are identical or different from each other.

[0324] Most preferably, the structure of Formula II is selected from any one of the following structures:

[0325]

[0326]

[0327]

[0328]

[0329]

[0330]

[0331]

[0332]

[0333]

[0334]

[0335]

[0336]

[0337]

[0338]

[0339]

[0340]

[0341]

[0342]

[0343]

[0344]

[0345]

[0346]

[0347]

[0348]

[0349]

[0350]

[0351]

[0352]

[0353]

[0354]

[0355] .

[0356] In the organic electroluminescent device of the present invention, the capping layer material can be an organic material, an inorganic material, or a composite capping layer of organic and inorganic materials. It can be selected from at least one material chosen from carbocyclic compounds, heterocyclic compounds, amine compounds, porphyrin derivatives, phthalocyanine derivatives, naphthylphthalocyanine derivatives, alkali metal complexes, and alkaline earth metal complexes. The capping layer material of the present invention can be any one or a combination of at least two of Alq3, TPBi, CBP, or other known suitable capping layer materials.

[0357] There are no particular restrictions on the preparation and formation methods of each layer in the organic electroluminescent device. Any one of the following methods can be used: vacuum evaporation, spin coating, vapor deposition, blade coating, laser thermal transfer, electrospray coating, slot coating, and dip coating. In this invention, vacuum evaporation is preferred.

[0358] The organic electroluminescent device described in this invention can be widely used in display devices, lighting devices, solar cells, portable or mobile terminals (e.g., smartphones, tablets, personal digital assistants (PDAs), electronic dictionaries, or portable media players, navigation terminals, game consoles, TVs, computer monitors, etc.).

[0359] This invention also provides a method for preparing compounds represented by Formula I and Formula II, but the preparation method of this invention is not limited thereto. The core structure of the compounds of Formula I and Formula II can be prepared by the reaction route shown below, the substituents can be bonded by methods known in the art, and the type and position or number of substituents can be changed according to techniques known in the art.

[0360] Preparation of Formula I:

[0361] The compounds of Formula I of this invention can be obtained by the conventional Buchwald-Hartwig reaction in the art, i.e., under a nitrogen atmosphere, amine compound l reacts with halogen compound m via a Buchwald reaction to obtain intermediate M, which then undergoes a Buchwald reaction with halogen compound n, and reacts with appropriate catalysts, organic bases, ligands, solutions, and temperatures to obtain the corresponding compound of Formula I, wherein halogen X... m X n It can be Cl, Br, or I.

[0362] Preparation of Formula II:

[0363] The structure shown in Formula II of this invention is obtained by a Suzuki coupling reaction to yield compound of Formula II, wherein X m X n X p Selected from Cl, Br, or I.

[0364] This invention does not impose any particular restrictions on the source of the raw materials used in the above-described reactions; commercially available raw materials or preparation methods well known to those skilled in the art can be used. This invention also does not impose any particular restrictions on the above reactions; conventional reactions well known to those skilled in the art can be used.

[0365] The invention is explained in more detail through the following examples, but is not intended to limit the invention. Based on this description, those skilled in the art will be able to practice the invention and prepare other compounds and devices according to the invention within the entire scope disclosed without inventive effort.

[0366] Description of raw materials, reagents, and characterization equipment: The present invention does not impose any particular restrictions on the source of raw materials used in the following embodiments, which can be commercially available products or prepared using preparation methods well known to those skilled in the art.

[0367] Mass spectrometry was performed using a Waters G2-Si quadrupole tandem time-of-flight high-resolution mass spectrometer, with chloroform as the solvent. Elemental analysis was performed using a Vario EL cube organic elemental analyzer from Elementar GmbH, Germany, with sample masses ranging from 5 to 10 mg.

[0368] Synthetic Example 1: Preparation of Compounds 2-15

[0369] Preparation of intermediate A-2-15: Under nitrogen protection, a-2-15 (49.39 g, 150.00 mmol), pinacol diborate (38.09 g, 150.00 mmol), K2CO3 (41.46 g, 300.00 mmol), Pd(PPh3)4 (1.73 g, 1.5 mmol), and 900 mL of dimethylformamide were added to a reaction flask. The mixture was stirred under reflux for 6 hours. After the reaction was completed, the reaction mixture was cooled to room temperature, water was added, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was removed by rotary evaporation. The mixture was then recrystallized from toluene / ethanol (10:3) to give intermediate A-2-15 (43.47 g, 77% yield), with an HPLC purity ≥99.86%. Mass spectrometry m / z: 376.2588 (theoretical value: 376.2574).

[0370] Preparation of intermediate B-2-15: Under nitrogen protection, A-2-15 (37.63 g, 100.00 mmol), b-2-15 (26.76 g, 100.00 mmol), K2CO3 (20.73 g, 150.00 mmol), Pd(PPh3)4 (1.16 g, 1.00 mmol), and 750 mL of toluene / ethanol / water (3:1:1) were added to a reaction flask. The mixture was stirred under reflux for 5 hours. After the reaction was completed, the reaction mixture was cooled to room temperature, filtered, washed with ethanol, and then recrystallized from toluene to obtain intermediate B-2-15 (34.52 g, yield 79%), with an HPLC purity ≥99.88%. Mass spectrometry m / z: 436.1969 (theoretical value: 436.1958).

[0371] Preparation of intermediate C-2-15: Under nitrogen protection, B-2-15 (28.41 g, 65.00 mmol), pinacol diborate (16.51 g, 65.00 mmol), KOAc (10.80 g, 110.00 mmol), Pd(dppf)Cl2 (0.39 g, 0.65 mmol), and 600 mL of 1,4-dioxane were added to a reaction flask. The mixture was stirred under reflux for 4.5 hours. After the reaction was completed, the reaction mixture was cooled to room temperature, water was added, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, the solvent was removed by rotary evaporation, and the mixture was recrystallized from toluene to give intermediate C-2-15 (27.83 g, yield 81%) with an HPLC purity ≥99.90%. Mass spectrometry m / z: 528.3211 (theoretical value: 528.3200).

[0372] Preparation of compound 2-15: Under nitrogen protection, C-2-15 (18.50 g, 35.00 mmol), c-2-15 (6.93 g, 35.00 mmol), K2CO3 (8.29 g, 60.00 mmol), Pd2(dba)3 (0.32 g, 0.35 mmol), P(t-Bu)3 (0.14 g, 0.70 mmol), and 250 mL of tetrahydrofuran were added to a reaction flask. The mixture was stirred under reflux for 5 hours. After the reaction was completed, the reaction mixture was cooled to room temperature, filtered to obtain a filter cake, washed with a small amount of toluene, and then recrystallized from the obtained filter cake with toluene to obtain compound 2-15 (14.37 g, yield 79%), with an HPLC purity ≥ 99.95%. Mass spectrometry m / z: 519.2574 (theoretical value: 519.2562). Theoretical elemental content (%) C 38 H 33 NO: C, 87.83; H, 6.40; N, 2.70. Measured elemental content (%): C, 87.85; H, 6.38; N, 2.70.

[0373] Synthesis Example 2: Preparation of Compound 2-86

[0374]

[0375] According to the preparation method in Example 1, equimolar amounts of a-2-15 and b-2-15 were replaced with equimolar amounts of a-2-86, respectively, to obtain compound 2-86 (15.25 g) with an HPLC purity ≥ 99.91%. Mass spectrometry m / z: 588.2211 (theoretical value: 588.2202). Theoretical elemental content (%) C 43 H28 N₂O: C, 87.73; H, 4.79; N, 4.76. Measured elemental content (%): C, 87.76; H, 4.75; N, 4.77.

[0376] Synthesis Example 3: Preparation of Compound 2-263

[0377] According to the preparation method in Example 1, equimolar amounts of a-2-15 were replaced with equimolar amounts of a-2-263 to obtain compound 2-263 (15.80 g), with an HPLC purity ≥ 99.97%. Mass spectrometry m / z: 601.2420 (theoretical value: 601.2406). Theoretical elemental content (%) C 45 H 31 NO: C, 89.82; H, 5.19; N, 2.33. Measured elemental content (%): C, 89.80; H, 5.20; N, 2.31.

[0378] Synthesis Example 4: Preparation of Compound 2-281

[0379] According to the preparation method in Synthesis Example 1, equimolar amounts of a-2-15 were replaced with equimolar amounts of a-2-281 to obtain compound 2-281 (15.95 g), with an HPLC purity ≥ 99.95%. Mass spectrometry m / z: 615.2577 (theoretical value: 615.2562). Theoretical elemental content (%) C 46 H 33 NO: C, 89.73; H, 5.40; N, 2.27. Measured elemental content (%): C, 89.76; H, 5.42; N, 2.24.

[0380] Synthesis Example 5: Preparation of Compound 2-292

[0381] According to the preparation method in Example 1, equimolar amounts of a-2-15 were replaced with equimolar amounts of a-2-292 to obtain compound 2-292 (17.12 g), with an HPLC purity ≥ 99.98%. Mass spectrometry m / z: 643.2865 (theoretical value: 643.2875). Theoretical elemental content (%) C 48 H 37 NO: C, 89.55; H, 5.79; N, 2.18. Measured elemental content (%): C, 89.57; H, 5.82; N, 2.17.

[0382] Synthesis Example 6: Preparation of Compound 2-307

[0383] According to the preparation method in Example 1, equimolar amounts of a-2-15 were replaced with equimolar amounts of a-2-307 to obtain compound 2-307 (16.86 g), with an HPLC purity ≥ 99.93%. Mass spectrometry m / z: 659.2633 (theoretical value: 659.2644). Theoretical elemental content (%) C 47 H 37 NOSi: C, 85.55; H, 5.65; N, 2.12. Measured elemental content (%): C, 85.57; H, 5.67; N, 2.10.

[0384] Synthesis Example 7: Preparation of Compound 2-378

[0385] According to the preparation method in Example 1, equimolar amounts of a-2-15 were replaced with equimolar amounts of a-2-378 to obtain compound 2-378 (17.32 g), with an HPLC purity ≥ 99.94%. Mass spectrometry m / z: 677.2710 (theoretical value: 677.2719). Theoretical elemental content (%) C 51 H 35 NO: C, 90.37; H, 5.20; N, 2.07. Measured elemental content (%): C, 90.39; H, 5.18; N, 2.05.

[0386] Synthesis Example 8: Preparation of Compound 2-420

[0387] According to the preparation method in Synthesis Example 1, equimolar amounts of a-2-15 were replaced with equimolar amounts of a-2-420 to obtain compound 2-420 (16.96 g), with an HPLC purity ≥ 99.93%. Mass spectrometry m / z: 663.2578 (theoretical value: 663.2562). Theoretical elemental content (%) C 50 H 33 NO: C, 90.47; H, 5.01; N, 2.11. Measured elemental content (%): C, 90.50; H, 5.00; N, 2.10.

[0388] Synthesis Example 9: Preparation of Compound 2-530

[0389] According to the preparation method in Synthesis Example 1, equimolar amounts of a-2-15 and b-2-15 were replaced with equimolar amounts of a-2-530 and b-2-15, respectively, to obtain compound 2-530 (14.22 g) with an HPLC purity ≥ 99.95%. Mass spectrometry m / z: 588.2213 (theoretical value: 588.2202). Theoretical elemental content (%) C 43 H 28 N2O: C, 87.73; H, 4.79; N, 4.76. Measured elemental content (%): C, 87.70; H, 4.81; N, 4.75.

[0390] Synthesis Example 10: Preparation of Compound 2-742

[0391] According to the preparation method in Synthesis Example 1, equimolar amounts of a-2-15 were replaced with equimolar amounts of a-2-742 to obtain compound 2-742 (13.22 g), with an HPLC purity ≥ 99.96%. Mass spectrometry m / z: 503.2261 (theoretical value: 503.2249). Theoretical elemental content (%) C 37 H 29 NO: C, 88.24; H, 5.80; N, 2.78. Measured elemental content (%): C, 88.27; H, 5.78; N, 2.77.

[0392] Synthetic Example 11: Preparation of Compound 2-1095

[0393] According to the preparation method in Example 1, equimolar amounts of a-2-15 were replaced with equimolar amounts of a-2-1095 to obtain compound 2-1095 (18.49 g), with an HPLC purity ≥ 99.97%. Mass spectrometry m / z: 713.3126 (theoretical value: 713.3116). Theoretical elemental content (%) C 52 H 43 NS: C, 87.48; H, 6.07; N, 1.96. Measured elemental content (%): C, 87.51; H, 6.04; N, 1.98.

[0394] [Device Examples 1-25] Device Fabrication Examples:

[0395] Device Example 1: Fabrication of an organic electroluminescent device using vacuum thermal evaporation. The experimental steps were as follows: The ITO substrate was washed three times in distilled water, ultrasonically washed for 15 minutes, and after the distilled water washing was completed, it was ultrasonically washed in sequence with solvents such as isopropanol, acetone, and methanol, and then dried at 120°C before being sent to the evaporation machine.

[0396] On a prepared ITO transparent electrode, a hole injection layer (HI / 60 nm), a hole transport layer (compound 10 / 100 nm), a bulk m-CBP:doped Ir(ppy)2acac (94%:6% mass ratio) / 24 nm were deposited by vacuum evaporation. Then, a hole blocking layer (compound 2-263 / 16 nm), an electron transport layer (ET and Liq, 1:1 mass ratio) / 22 nm, an electron injection layer (LiF / 1 nm), and a cathode (Al / 120 nm) were deposited. The device was then sealed in a glove box, thus fabricating an organic electroluminescent device. After completing the fabrication of the organic electroluminescent device according to the above steps, the photoelectric performance of the device was measured. The molecular structures of the relevant materials are shown below:

[0397] Device Examples 2-25: The hole transport layer compound 10 of the organic electroluminescent device is sequentially replaced with compounds 21, 26, 50, 63, 67, 69, 86, 105, 114, 117, 127, 155, 181, 221, 229, 242, 263, 279, 297, 332, 369, 400, 442, and 515 of the present invention; the hole blocking layer compound 2-263 is sequentially replaced with compound 2- of the present invention. Compounds 292, 2-281, 2-378, 2-15, 2-307, 2-182, 2-193, 2-75, 2-438, 2-952, 2-1095, 2-652, 2-815, 2-420, 2-777, 2-227, 2-240, 2-86, 2-1226, 2-466, 2-327, 2-530, 2-463, and 2-879, with all other steps being the same as in Device Example 1.

[0398] Comparative Example 1: On a prepared ITO transparent electrode, a hole injection layer HI / 60nm, a hole transport layer compound 26 / 100nm, a substrate m-CBP:doped Ir(ppy)2acac (94%:6% mass ratio) / 24nm, an electron transport layer ET and Liq (doping ratio 1:1 mass ratio) / 38nm, an electron injection layer LiF / 1nm, and a cathode Al / 120nm were deposited by vacuum evaporation. The device was then sealed in a glove box to fabricate an organic electroluminescent device. After completing the fabrication of the organic electroluminescent device according to the above steps, the photoelectric performance of the device was measured.

[0399] Comparative Examples 2-10: The hole transport layer compound 26 in Comparative Example 1 was replaced sequentially with compounds 242, 114, 50, 69, 67, 63, 86, 155, and 400 of the present invention, and the organic electroluminescent devices of Comparative Examples 2-10 were manufactured in the same manner as in Comparative Example 1.

[0400] Comparative Example 11: On a prepared ITO transparent electrode, a hole injection layer HI / 60nm, a hole transport layer compound HT / 100nm, a bulk m-CBP:doped Ir(ppy)2acac (94%:6% mass ratio) / 24nm were deposited by vacuum evaporation. Then, a hole blocking layer compound 2-263 / 16nm was deposited, an electron transport layer ET and Liq (doping ratio 1:1 mass ratio) / 22nm was deposited, an electron injection layer LiF / 1nm, and a cathode Al / 120nm were deposited. The device was then sealed in a glove box to fabricate an organic electroluminescent device. After completing the fabrication of the organic electroluminescent device according to the above steps, the photoelectric performance of the device was measured.

[0401] Comparative Examples 12-18: The hole blocking layer compound 2-263 in Comparative Example 11 was replaced sequentially with compounds 2-292, 2-281, 2-378, 2-15, 2-307, 2-182, and 2-193 of the present invention, and the organic electroluminescent devices of Comparative Examples 12-18 were manufactured in the same manner as in Comparative Example 11.

[0402] Comparative Example 19: The compound HT in the hole transport layer of Comparative Example 11 was replaced with compound HT-a, and the hole blocking layer compound 2-263 was replaced with compound ET-b. The other steps were the same, and the comparative organic electroluminescent device 19 was obtained.

[0403] A combined IVL testing system was used to test the luminous efficiency of organic electroluminescent devices (OLEDs), comprising testing software, a computer, a Keithley K2400 digital source meter, and a PhotoResearch PR788 spectral scanning luminance meter. Lifetime testing was performed using a McScience M6000 OLED lifetime testing system. The testing environment was atmospheric, and the temperature was room temperature. The luminous characteristic test results of the obtained OLEDs are shown in Table 1. Table 1 presents the luminous characteristic test results of the OLEDs prepared by the compounds in the embodiments of this invention and the comparative materials.

[0404] Table 1. Luminescence characteristics test of organic electroluminescent devices

[0405]

[0406] Note: T97 refers to a current density of 10 mA / cm². 2 Under these conditions, the time it takes for the device's brightness to decay to 97%; As can be seen from the results in Table 1, the organic electroluminescent device of the present invention exhibits advantages of high luminous efficiency and long lifespan compared with comparative examples 1-19, making it a high-performance organic electroluminescent device. This is attributed to the combination of the specific hole transport material and the specific hole blocking material of the present invention, demonstrating the synergistic effect of the hole transport layer and the hole blocking material. The combined effect of these two materials enables the performance of the organic electroluminescent device of the present invention to break through the limitations of conventional organic electroluminescent devices, exhibiting advantages of high luminous efficiency and long lifespan.

[0407] Device Example 26: Fabrication of an organic electroluminescent device using vacuum thermal evaporation. The experimental steps were as follows: The ITO substrate was washed three times in distilled water, ultrasonically washed for 15 minutes, and after the distilled water washing was completed, it was ultrasonically washed in sequence with solvents such as isopropanol, acetone, and methanol, and then dried at 120°C before being sent to the evaporation machine.

[0408] On a prepared ITO transparent electrode, a hole injection layer (HI / 60nm), a hole transport layer compound (NPB / 70nm), a light-emitting auxiliary layer compound (10 / 30nm), a host m-CBP:doped RD (97:3 mass ratio) / 25nm, an electron transport layer compound (2-86 and Liq, 1:1 mass ratio) / 35nm, an electron injection layer (LiF / 1nm), and a cathode (Al / 125nm) were deposited by vacuum evaporation. The device was then sealed in a glove box, thus fabricating an organic electroluminescent device. After completing the fabrication of the organic electroluminescent device according to the above steps, the photoelectric performance of the device was measured. The molecular structures of the relevant materials are shown below:

[0409] Device Examples 27-50: The hole transport layer compound 10 of the organic electroluminescent device is sequentially replaced with compounds 21, 26, 50, 63, 67, 69, 86, 105, 114, 117, 127, 155, 181, 221, 229, 242, 263, 279, 297, 332, 369, 400, 442, and 515 of the present invention; the electron transport layer compounds 2-86 are sequentially replaced with compounds 2- of the present invention. Compounds 2-607, 2-214, 2-263, 2-292, 2-281, 2-378, 2-15, 2-182, 2-193, 2-75, 2-438, 2-952, 2-1095, 2-652, 2-844, 2-871, 2-742, 2-240, 2-365, 2-333, 2-400, 2-910, and 2-163 were used. All other steps were the same as in Device Example 26.

[0410] Comparative Example 20: A hole injection layer (HI / 60nm), a hole transport layer compound (NPB / 70nm), a light-emitting auxiliary layer compound (26 / 30nm), a bulk m-CBP:doped RD (97:3 mass ratio) / 25nm, an electron transport layer compound (Alq3 and Liq, 1:1 mass ratio) / 35nm, an electron injection layer (LiF / 1nm), and a cathode (Al / 125nm) were deposited on a prepared ITO transparent electrode using a layer-by-layer vacuum evaporation process. The device was then sealed in a glove box, thus fabricating an organic electroluminescent device. After completing the fabrication of the organic electroluminescent device according to the above steps, its photoelectric performance was measured.

[0411] Comparative Examples 21-29: The hole transport layer compound 26 in Comparative Example 20 was replaced sequentially with compounds 242, 114, 50, 69, 67, 63, 86, 155, and 400 of the present invention, and the organic electroluminescent devices of Comparative Examples 21-29 were manufactured in the same manner as in Comparative Example 20.

[0412] Comparative Example 30: A hole injection layer (HI / 60nm), a hole transport layer compound (NPB / 100nm), a bulk m-CBP:doped RD (97:3 mass ratio) / 25nm were deposited on a prepared ITO transparent electrode using a layer-by-layer vacuum evaporation method. Then, an electron transport layer compound (2-86) and Liq (doping ratio 1:1 mass ratio) / 35nm, an electron injection layer (LiF / 1nm), and a cathode (Al / 125nm) were deposited. The device was then sealed in a glove box to fabricate an organic electroluminescent device. After completing the fabrication of the organic electroluminescent device according to the above steps, the photoelectric performance of the device was measured.

[0413] Comparative Examples 31-37: The hole blocking layer compound 2-86 in Comparative Example 30 was replaced sequentially with compounds 2-530, 2-607, 2-214, 2-263, 2-292, 2-281, and 2-378 of the present invention, and the organic electroluminescent devices of Comparative Examples 31-37 were manufactured in the same manner as in Comparative Example 30.

[0414] A combined IVL testing system was used to test the luminous efficiency of organic electroluminescent devices (OLEDs), comprising testing software, a computer, a Keithley K2400 digital source meter, and a PhotoResearch PR788 spectral scanning luminance meter. Lifetime testing was performed using a McScience M6000 OLED lifetime testing system. The testing environment was atmospheric, and the temperature was room temperature. The luminous characteristic test results of the obtained OLEDs are shown in Table 2. Table 2 presents the luminous characteristic test results of the OLEDs prepared by the compounds in the embodiments of this invention and the comparative materials.

[0415] Table 2. Luminescence characteristics test of organic electroluminescent devices

[0416]

[0417] As can be seen from the results in Table 2, the organic electroluminescent device of the present invention exhibits advantages of high luminous efficiency and long lifespan compared with comparative examples 20-37, making it a high-performance organic electroluminescent device. This is attributed to the combination of the specific light-emitting auxiliary layer material and the specific electron transport layer material of the present invention, which demonstrates the synergistic effect of the light-emitting auxiliary layer and the electron transport layer. The combined effect of the two enables the performance of the organic electroluminescent device of the present invention to break through the limitations of conventional organic electroluminescent devices, exhibiting advantages of high luminous efficiency and long lifespan.

[0418] It should be noted that the present invention has been specifically described with reference to individual embodiments, but those skilled in the art can make various forms or details of improvements to the present invention without departing from the principles of the present invention, and these improvements also fall within the protection scope of the present invention.

Claims

1. An organic electroluminescent device, comprising an anode, a hole transport region, an emissive layer, an electron transport region, and a cathode, wherein the hole transport region is located between the anode and the emissive layer, and the electron transport region is located between the emissive layer and the cathode, characterized in that, The hole transport region includes the structure shown in Equation I, and the electron transport region includes the structure shown in Equation II. In Formula I, Ar1 is selected from one of the following groups: The z that are the same or different are selected from C or N; R1, R2, and R3 are independently selected from one of hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R1 and R2 can be connected to form a cyclic structure; The L is selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkyl, substituted or unsubstituted C2-C20 heteroarylene; X1 is selected from CR7R8, O, S, or NR9, wherein R7 and R8 are independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C2-C30 heteroaryl; and R9 is selected from one of hydrogen, deuterium, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring, and substituted or unsubstituted C2-C25 heteroaryl. The R h Selected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, fused ring of substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R h They can be connected to form a ring structure; h1 is selected from 0, 1, 2 or 3; h2 is selected from 0, 1, 2, 3 or 4; Z is selected from O or S; The same or different v is selected from C or N; R4 and R5 are independently selected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C2-C30 alkenyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, substituted or unsubstituted C2-C25 heteroaryl, or adjacent R4 can be connected to form a cyclic structure, or adjacent R5 can be connected to form a cyclic structure; The value of r is selected from 0, 1, 2, or 3; the value of s is selected from 0, 1, 2, 3, or 4. The Ar2 is selected from one of the following: substituted or unsubstituted C6-C25 aryl groups, substituted or unsubstituted C6-C30 aromatic rings and C3-C30 aliphatic rings fused ring groups, and substituted or unsubstituted C2-C25 heteroaryl groups. L1, L2, and L3 are independently selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkyl, and substituted or unsubstituted C2-C20 heteroarylene. In formula II, A is selected from any of the following structures. The R a R b R c The same or different from any one selected from hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; or adjacent R a With R b They can be linked together to form substituted or unsubstituted C3~C10 aliphatic rings; The x that is the same or different is selected from CR6 or N; the R6 is selected from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1~C15 alkyl, substituted or unsubstituted C3~C15 cycloalkyl, substituted or unsubstituted C2~C30 alkenyl, substituted or unsubstituted C6~C25 aryl, substituted or unsubstituted C6~C30 aromatic ring and C3~C30 aliphatic ring fused ring group, substituted or unsubstituted C2~C25 heteroaryl, or adjacent R6 can be connected to form a cyclic structure; The L m Selected from any one of the following: single bond, substituted or unsubstituted C6-C18 arylene groups, substituted or unsubstituted C3-C10 aliphatic rings and C6-C25 aromatic rings, substituted or unsubstituted C2-C20 heteroarylene groups; X2 is selected from CR d R e , O, S or NR f , wherein R d R e Independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; said R f It is selected from one of hydrogen, deuterium, substituted or unsubstituted silyl, substituted or unsubstituted C1-C15 alkyl, substituted or unsubstituted C3-C15 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group, and substituted or unsubstituted C2-C25 heteroaryl; The B is selected from the structure shown below. The y that is the same or different is selected from CR. k Or N; X3 is selected from O, S, and NR. r Any one of them; The R g R k The same or different, independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl; The R r It is selected from any one of hydrogen, deuterium, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted silyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C2-C30 heteroaryl. The L r L s L t It is independently selected from one of the following: single bond, substituted or unsubstituted C6-C25 arylene, substituted or unsubstituted C3-C10 aliphatic ring and C6-C25 aromatic ring fused and cycloalkenes, and substituted or unsubstituted C2-C20 heteroarylene.

2. The organic electroluminescent device according to claim 1, characterized in that, The Ar1 is selected from any of the following structures: The z that are the same or different are selected from C or N; The R h The same or different from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted isopropyl, substituted or unsubstituted tert-butyl, substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted norbornel, substituted or unsubstituted adamantyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted pyridyl, substituted or unsubstituted pyrimidinyl, etc. The substituent is selected from any one of the following: substituted or unsubstituted triazine, substituted or unsubstituted pyrazine, substituted or unsubstituted quinolinyl, substituted or unsubstituted isoquinolinyl, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, substituted or unsubstituted benzofuranyl, substituted or unsubstituted benzothiophenyl, substituted or unsubstituted indolyl, wherein the substituent is selected from one or more of the following: deuterium, cyano, methyl, ethyl, isopropyl, tert-butyl, cyclobutyl, cyclopentyl, cyclohexyl, norbornelalkyl, adamantylalkyl, phenyl, deuterated phenyl, biphenyl, terphenyl, tolyl, and naphthyl. The R f It is selected from any one of hydrogen, deuterium, trimethylsilyl, triphenylsilyl, triethylsilyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, deuterated phenyl, methylphenyl, biphenyl, deuterated biphenyl, naphthyl, indene, indanyl, benzofuranyl, benzothiophene, indolyl, pyridyl, pyrimidinyl, triazinyl, quinolinyl, isoquinolinyl, quinazolinyl, and quinoxalinyl; The L is selected from any one of the following: single bond, substituted or unsubstituted phenylene, substituted or unsubstituted biphenylene, substituted or unsubstituted terphenylene, substituted or unsubstituted naphthylene, substituted or unsubstituted pyridylene, substituted or unsubstituted pyrimidinylene, substituted or unsubstituted triazineylene, substituted or unsubstituted pyridazineylene, substituted or unsubstituted pyridazineylene, substituted or unsubstituted quinolinylene, substituted or unsubstituted isoquinolinylene, substituted or unsubstituted quinazolinylene, substituted or unsubstituted quinoxalinylene, substituted or unsubstituted benzofuranylene, substituted or unsubstituted benzothiophenylene, and substituted or unsubstituted indoleylene. The values ​​of h0 (which may be the same or different) are selected from 0, 1, 2, 3, 4, or 5; the values ​​of h1 (which may be the same or different) are selected from 0, 1, 2, or 3; the values ​​of h2 (which may be the same or different) are selected from 0, 1, 2, 3, or 4; the values ​​of h3 (which may be the same or different) are selected from 0, 1, 2, 3, 4, 5, 6, or 7; the values ​​of h4 (which may be the same or different) are selected from 0, 1, 2, 3, 4, 5, or 6; the values ​​of h5 (which may be the same or different) are selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8. Or 9; the same or different h6 is selected from 0, 1, 2, 3, 4, 5, 6, 7 or 8; the same or different h7 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11; the same or different h8 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; the same or different h9 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12; the h 10 The same or different values ​​are selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14; when there are two or more R values. h At that time, two or more R h They may be the same as or different from each other.

3. An organic electroluminescent device according to claim 1, characterized in that, The Ar2 is selected from any of the following structures: Wherein, Y is selected from O, S or NR. y The R y It is selected from hydrogen, deuterium, substituted or unsubstituted C1-C30 silyl, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C6-C60 aryl, and substituted or unsubstituted C3-C60 heteroaryl. The t is selected from CR n Or N atoms; V is selected from O, S, NR u or CR v R w The R u Selected from one of hydrogen, deuterium, substituted or unsubstituted C1-C30 silyl groups, substituted or unsubstituted C1-C30 alkyl groups, substituted or unsubstituted C3-C30 cycloalkyl groups, substituted or unsubstituted C6-C60 aryl groups, and substituted or unsubstituted C3-C60 heteroaryl groups; or R u The corresponding nitrogen atom is the site connected to the bridging L2; The R v R w Independently selected from hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, or one of the following substituted or unsubstituted groups: silyl, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, norbornel, camphenyl, phenyl, biphenyl, terphenyl, naphthyl, tetrahydronaphthyl, dihydronaphthyl, indanyl, indole, pyridyl, pyrazinyl, pyridazinyl, triazinyl, quinolinyl, isoquinolinyl, quinoxalinyl, quinazolinyl, benzolinyl, benzofuranyl, benzothiopheneyl, indolyl, dibenzofuranyl, dibenzothiopheneyl, 9-phenylcarbazoyl, methylfluorenyl, phenylfluorenyl, spirofluorenyl, or adjacent R v R w Groups can bond together to form substituted or unsubstituted cyclic structures; or R v R w The carbon atom corresponding to one of them is the site connected to bridge L2; The u that is the same or different is selected from CR n Or N atoms, and at least one u is selected from N atoms, wherein R n Identical or different from each other, selected from hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, or substituted or unsubstituted groups of the following: silyl, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantyl, norbornyl, tetrahydronaphthyl, dihydronaphthyl, indanyl, indenyl, phenyl, biphenyl, terphenyl, naphthyl, anthracene, phenanthrene, triphenylene, pyrene, pyridyl, pyrazinyl, pyridazinyl, tri- The substituents in the "substituted or unsubstituted" group are selected from one or more of the following: azinoyl, quinolinyl, isoquinolinyl, quinoxalinyl, quinazolinyl, cenolinyl, benzofuranyl, benzothiophenyl, and indoleyl; wherein the substituents in "substituted or unsubstituted" are selected from deuterium, tritium, cyano, halogen, trifluoromethyl, methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantyl, norbornel, phenyl, biphenyl, and naphthyl, or optionally two adjacent R groups. n Groups can bond together to form substituted or unsubstituted benzene rings, substituted or unsubstituted naphthalene rings, substituted or unsubstituted pyridine rings, substituted or unsubstituted pyrimidine rings, substituted or unsubstituted pyridazine rings, substituted or unsubstituted pyrazine rings, or substituted or unsubstituted tri- to octet aliphatic rings; in the case of being substituted by multiple substituents, the multiple substituents may be the same as or different from each other; The n1 is selected from 1, 2, 3, 4 or 5; the n2 is selected from 1, 2, 3 or 4.

4. An organic electroluminescent device according to claim 1, characterized in that, L1, L2, and L3 are independently selected from single bonds or any one of the following groups, or from a combination of two or more of the following groups: The r is selected from either CH or N; The Y a Y b Independently selected from O, S, N(R) w Any one of the following; The Y c Selected from O, S, C(R) p R q ), N(R v Any one of the following; The ring B is selected from substituted or unsubstituted C3~C10 alicyclic rings; The R z R z 'Independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C1-C25 heterocyclic alkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl, substituted or unsubstituted C3-C30 alicyclic and C6-C30 aromatic ring fused cycloyl, substituted or unsubstituted C1-C25 heterocyclic alkane and C6-C30 aromatic ring fused cycloyl, substituted or unsubstituted C3-C25 alicyclic and C2-C30 heteroaromatic ring fused cycloyl; The R p R q Independently selected from any one of hydrogen, deuterium, tritium, halogen, cyano, nitro, substituted or unsubstituted silyl, substituted or unsubstituted C1-C25 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C1-C25 heterocycloalkyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C30 heteroaryl, or R p R q The links between them form substituted or unsubstituted rings; The R w R v It is independently selected from any one of hydrogen, deuterium, tritium, substituted or unsubstituted silyl, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C3-C25 cycloalkyl, substituted or unsubstituted C1-C25 heterocycloalkyl, substituted or unsubstituted C6-C30 aryl, and substituted or unsubstituted C2-C30 heteroaryl; p is selected from 1, 2, 3, or 4; z1 is selected from 0, 1, 2, 3, or 4; z2 is selected from 0, 1, 2, 3, 4, 5, or 6; z3 is selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8; z4 is selected from 0, 1, or 2; when there are two or more R... z At that time, two or more R z The same or different between each other, or two adjacent R z They connect with each other to form substituted or unsubstituted rings; The z'1 is selected from 0, 1, or 2; when there are two or more R z At that time, two or more R z 'They are the same as or different from each other.' 5. An organic electroluminescent device according to claim 1, characterized in that, The structure of Formula I is selected from any one of the structures shown below. 。 6. An organic electroluminescent device according to claim 1, characterized in that, The structure of Formula II is selected from any one of the structures shown in Formulas 2-1 to 2-8 below. 。 7. An organic electroluminescent device according to claim 1, characterized in that, A is selected from any of the structures shown below. The x that is the same or different is selected from CR6 or N; The R6, R 10 The same or different from hydrogen, deuterium, halogen, cyano, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted methyl, substituted or unsubstituted ethyl, substituted or unsubstituted isopropyl, substituted or unsubstituted tert-butyl, substituted or unsubstituted cyclobutyl, substituted or unsubstituted cyclopentyl, substituted or unsubstituted cyclohexyl, substituted or unsubstituted norbornel, substituted or unsubstituted adamantyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted pyridyl, substituted or unsubstituted pyrimidinyl, etc. The substituent is selected from any one of the following: substituted or unsubstituted triazine, substituted or unsubstituted pyrazine, substituted or unsubstituted quinolinyl, substituted or unsubstituted isoquinolinyl, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, substituted or unsubstituted benzofuranyl, substituted or unsubstituted benzothiophenyl, substituted or unsubstituted indolyl, wherein the substituent is selected from one or more of the following: deuterium, cyano, methyl, ethyl, isopropyl, tert-butyl, cyclobutyl, cyclopentyl, cyclohexyl, norbornelalkyl, adamantylalkyl, phenyl, deuterated phenyl, biphenyl, terphenyl, tolyl, and naphthyl. The R f It is selected from any one of hydrogen, deuterium, trimethylsilyl, triphenylsilyl, triethylsilyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, deuterated phenyl, methylphenyl, biphenyl, deuterated biphenyl, naphthyl, indene, indanyl, benzofuranyl, benzothiophene, indolyl, pyridyl, pyrimidinyl, and triazineyl; The same or different d1 is selected from 0, 1, 2, 3, 4 or 5; the same or different d2 is selected from 0, 1, 2, 3 or 4; the same or different d3 is selected from 0, 1, 2, 3, 4, 5, 6 or 7; the same or different d4 is selected from 0, 1, 2, 3, 4, 5 or 6; the same or different d5 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9; the same or different d6 is selected from 0, 1, 2, 3, 4, 5, 6, 7 or 8; the same or different d7 is selected from 0, 1, 2 or 3; the same or different d8 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11; the same or different d9 is selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; the d 10 The same or different values ​​are selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12; the d 11 The same or different values ​​are selected from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14; when there are two or more R values. 10 At that time, two or more R 10 They may be the same as or different from each other.

8. An organic electroluminescent device according to claim 1, characterized in that, The B is selected from any of the structures shown below. X3 is selected from O, S, and NR. r Any one of them; The R r Selected from any one of the following groups, which are hydrogen, deuterium, substituted or unsubstituted: silyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, tolyl, deuterated phenyl, biphenyl, terphenyl, naphthyl, pyridyl, pyrimidinyl, triazinyl, pyrazinyl, quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, benzofuranyl, benzothiopheneyl, and indoleyl; The R g R k The same or different, independently selected from any one of hydrogen, deuterium, halogen, cyano, nitro, silyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, tolyl, deuterated phenyl, biphenyl, terphenyl, naphthyl, pyridinyl, pyrimidinyl, triazinyl, pyrazinyl, quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, benzofuranyl, benzothiopheneyl, indolyl, dibenzofuranyl, dibenzothiopheneyl, 9-phenylcarbazoyl, methylfluorenyl, phenylfluorenyl, and spirofluorenyl; The R g R k It can be substituted by one or more substituents, wherein the same or different substituents are selected from any one of deuterium, halogen, cyano, nitro, trimethylsilyl, triphenylsilyl, methyl, ethyl, isopropyl, tert-butyl, norbornel, adamantyl, phenyl, biphenyl, naphthyl, pyridyl, pyrimidinyl, benzofuranyl, benzothiophenyl, and indoleyl; when two or more substituents are present, the two or more substituents are the same or different from each other; The m1 that is the same or different is selected from 0, 1, 2, 3, or 4; the m2 that is the same or different is selected from 0, 1, 2, 3, 4, 5, or 6; the m3 that is the same or different is selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8; the m4 that is the same or different is selected from 0, 1, 2, or 3; the m5 that is the same or different is selected from 0, 1, 2, 3, 4, or 5; the m6 that is the same or different is selected from 0, 1, 2, 3, 4, 5, 6, or 7; the m7 that is the same or different is selected from 0, 1, or 2; the m8 that is the same or different is selected from 0 or 1; when there are two or more R k At that time, two or more R k They may be the same as or different from each other.

9. An organic electroluminescent device according to claim 1, characterized in that, The L r L s L t The same or different from one of the single-bonded groups, as shown below, and combinations thereof: The R s They may be the same as or different from each other, and are selected from any one of hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, substituted or unsubstituted silyl, substituted or unsubstituted C1-C10 alkyl, substituted or unsubstituted C3-C12 cycloalkyl, substituted or unsubstituted C6-C25 aryl, substituted or unsubstituted C2-C25 heteroaryl, substituted or unsubstituted C6-C30 aromatic ring and C3-C30 aliphatic ring fused ring group; r0 is selected from 0, 1, or 2; r1 is selected from 0, 1, 2, 3, or 4; r2 is selected from 0, 1, 2, 3, 4, 5, or 6; r3 is selected from 0, 1, 2, 3, 4, 5, 6, 7, or 8; r4 is selected from 0, 1, 2, or 3; r5 is selected from 0 or 1. The R x R y The group is independently selected from hydrogen, deuterium, tritium, cyano, halogen, trifluoromethyl, or substituted or unsubstituted of the following groups: methyl, ethyl, n-propyl, n-butyl, isopropyl, tert-butyl, cyclohexyl, cyclopentyl, cyclobutyl, cyclopropyl, adamantyl, norbornel, phenyl, naphthyl, anthracene, phenanthrene, triphenylene, dibenzofuranyl, dibenzothiophene, 9,9-dimethylfluorenyl, 9,9-diphenylfluorenyl, spirofluorenyl, 9-phenylcarbazoyl, tetrahydronaphthyl, dihydronaphthyl, indanyl, and indanyl.

10. An organic electroluminescent device according to claim 1, characterized in that, The structure of Formula II is selected from any one of the following structures: 。

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