A compound and an organic electroluminescence device using the same

Abstract

The present application relates to a kind of compound, simultaneously relate to the application of this kind of compound and the organic electroluminescent device comprising it.The organic compound of the present application is shown in the structure of formula (1) or formula (2), ring A, ring B, ring C, ring D, ring E, ring F, ring G, ring H, ring I, ring J, ring K each independently represents one of C6-C60 aromatic ring, C5-C60 heteroaromatic ring, and at least one of ring C and ring D is any one structure in formula (1-1), formula (1-2) and formula (1-3).The compound of the present application is applied to organic electroluminescent device, while realizing that the device has high color purity and high luminous efficiency good performance, also has very long device life.

Description

Technical Field

[0001] This invention relates to the field of organic electroluminescence technology, and particularly to an organic compound, as well as the application of this compound and organic electroluminescent devices containing the compound. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are a type of device with a sandwich-like structure, consisting of positive and negative electrode layers and an organic functional material layer sandwiched between them. When a voltage is applied to the electrodes of an OLED device, positive charges are injected from the positive electrode and negative charges from the negative electrode. Under the influence of an electric field, the positive and negative charges migrate, meet, and recombine within the organic layer to emit light. Due to their advantages such as high brightness, fast response, wide viewing angle, simple manufacturing process, and flexibility, OLED devices have attracted significant attention in the fields of new display technology and new lighting technology. Currently, this technology is widely used in display panels for new lighting fixtures, smartphones, and tablets, and its application is expected to expand further into large-size display products such as televisions. It is a rapidly developing and technologically demanding new display technology.

[0003] In the selection of OLED light-emitting materials, singlet-state luminescent fluorescent materials have good lifetimes and low prices, but low efficiency; triplet-state luminescent phosphorescent materials have high efficiency, but are expensive, and the lifetime problem of blue light-emitting materials has not yet been solved. Adachi of Kyushu University in Japan proposed a new class of organic light-emitting materials, namely thermally activated delayed fluorescence (TADF) materials. This type of material utilizes donor-acceptor separation to obtain a smaller singlet-triplet bandgap (ΔE). ST (<0.3eV), allowing triplet excitons to transform into singlet excitons for emission via reverse system crossing (RISC), thus achieving an internal quantum efficiency of 100%. However, traditional TADF molecules have a highly distorted electron donor-acceptor structure, which cannot simultaneously achieve high reverse system crossing rates and high radiative transition rates, limiting further efficiency improvements. Furthermore, because TADF materials emit light in the CT state with a broad spectrum, they cannot meet the color requirements of BT.2020, thus restricting the further application of this type of material in the display field.

[0004] Boron-nitrogen-based multiple resonance (MR) TADF materials possess advantages such as high color purity and high luminous efficiency, attracting widespread attention from the scientific and industrial communities. In recent years, novel MR-TADF-based OLED materials, which combine high efficiency and narrow spectral density, have become a research hotspot in the field of organic electroluminescence. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an organic compound exhibiting exceptionally long stability. The specific technical solution is as follows:

[0006] An organic compound selected from the structure shown in formula (1) or formula (2), wherein in formula (1) and formula (2), ring A, ring B, ring C, ring D, ring E, ring F, ring G, ring H, ring I, ring J, and ring K are each independently represented as an aromatic ring of C6 to C60 or a heteroaromatic ring of C5 to C60, and at least one of ring C and ring D is any of the structures described in formula (1-1), formula (1-2), or formula (1-3);

[0007] In equations (1-1), (1-2), and (1-3), "*" indicates the connection site with equation (1) or (2). When ring C is selected from equation (1-1), (1-2), or (1-3), three adjacent "*" are randomly selected as the connection points between ring C and the parent nucleus. When ring D is selected from equation (1-1), (1-2), or (1-3), two adjacent "*" are randomly selected as the connection points between ring D and the parent nucleus. Any extra unbonded "*" after connection is "H".

[0008]

[0009] In equations (1) and (2), R a R b R c R d R e R f R g R h R i R j R k Each substituent can be independently represented from a single substituent to the maximum permissible number of substituents; R a R b R c R d R e R f R g R h R i R j R k Each is independently connected to the ring structure it is linked to via a single bond or fusion; R a R b R c R d R e R f R g R h R i R jR k Two adjacent elements in a given section are either not connected or connected in a loop.

[0010] R a R b R c R d R e R f R g R h R i R j R k Each group is independently selected from one of the following groups: hydrogen, deuterium, halogen, carbonyl, carboxyl, nitro, cyano, amino, or unsubstituted or R'-substituted: C1-C36 chain alkyl, C3-C36 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkoxy, C1-C10 alkylsilyl, C1-C10 alkylamino, C6-C30 arylamino, C3-C30 heteroarylamino, C6-C60 aryl, C6-C60 aryloxy, or C5-C60 heteroaryl;

[0011] The two adjacent R's mentioned above are either not connected or connected to form a ring; each R' is independently selected from one or a combination of two of the following: deuterium, halogen, cyano, amino, C2-C10 alkenyl, C1-C10 chain alkyl, C3-C10 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkoxy, C1-C10 alkylsilyl, C1-C10 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C6-C60 aryl, and C3-C60 heteroaryl.

[0012] In this invention, the "substituted or unsubstituted" group can replace one substituent or multiple substituents. When there are multiple substituents, they can be selected from different substituents. In this invention, when the same expression is used, they all have the same meaning, and the selection range of substituents is as shown above and will not be repeated one by one.

[0013] In this specification, the expression Ca to Cb represents that the group has a to b carbon atoms. Unless otherwise specified, the number of carbon atoms generally does not include the number of carbon atoms of the substituents.

[0014] In this specification, the ring structure indicated by "—" represents any position on the ring structure where bonding can occur; the dashed double bond represents the position where the group is fused in the parent nucleus.

[0015] In this specification, "each independently" means that when there are multiple subjects, they may be the same or different from each other.

[0016] In this invention, the description of chemical elements, unless otherwise specified, usually includes the concept of their isotopes. For example, the description of "hydrogen (H)" includes the concept of its isotopes 1H (protium or H) and 2H (deuterium or D); carbon (C) includes 12C, 13C, etc., which will not be elaborated further.

[0017] In this invention, heteroatoms generally refer to atoms or groups of atoms selected from N, O, S, P, Si and Se, preferably selected from N, O and S.

[0018] Examples of halogens in this specification include fluorine, chlorine, bromine, and iodine.

[0019] In this invention, unless otherwise specified, aryl and heteroaryl groups include both monocyclic and fused-ring groups.

[0020] In this invention, the term "single bond connection or fused connection" generally refers to the substituent group being directly connected to the parent structure via a single bond, or the substituent group being fused to the parent structure, thereby forming a fused-ring aromatic hydrocarbon structure with multiple aromatic rings sharing the same edge. The aromatic rings here include six-membered aromatic rings such as benzene rings, as well as five-membered and six-membered heteroaromatic rings containing atoms such as N, O, or S.

[0021] In this invention, C6-C60 can be C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, C32, C34, C36, C38, C40, C42, C44, C46, ​​C48, C50, C52, C54, C56, or C58, etc.

[0022] C3-C60 can all be C3, C4, C5, C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, C32, C34, C36, C38, C40, C42, C44, C46, ​​C48, C50, C52, C54, C56, or C58, etc.

[0023] C1-C20 can all be C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18 or C19, etc.

[0024] C3-C20 can all be C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18 or C19, etc.

[0025] C6-C30 can all be C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28, etc.

[0026] C3-C30 can all be C3, C4, C5, C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28, etc.

[0027] C2-C10 can all be C2, C3, C4, C5, C6, C7, C8, C9 or C10.

[0028] In this invention, the substituted or unsubstituted C6-C60 aryl (or C6-C50 aryl) includes monocyclic aryl and fused-ring aryl, preferably C6-C30 aryl, and more preferably C6-C20 aryl. A monocyclic aryl refers to a molecule containing at least one phenyl group. When a molecule contains at least two phenyl groups, the phenyl groups are independent of each other and connected by a single bond, exemplarily such as phenyl, biphenyl, and terphenyl. Specifically, the biphenyl includes 2-biphenyl, 3-biphenyl, and 4-biphenyl; the terphenyl includes p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, meta-terphenyl-4-yl, meta-terphenyl-3-yl, and meta-terphenyl-2-yl. A fused-ring aryl refers to a molecule containing at least two aromatic rings, where the aromatic rings are not independent of each other but share two adjacent carbon atoms fused together. Examples include: naphthyl, anthracene, phenanthrene, indene, fluorenyl, fluoranthyl, triphenylene, pyrene, perylene, etc. Naphthyl, 2-naphthyl, and their derivative groups, etc. The naphthyl includes 1-naphthyl or 2-naphthyl; the anthraceneyl is selected from 1-anthrayl, 2-anthrayl, and 9-anthrayl; the fluorenyl is selected from 1-fluorenyl, 2-fluorenyl, 3-fluorenyl, 4-fluorenyl, and 9-fluorenyl; the pyrene is selected from 1-pyrene, 2-pyrene, and 4-pyrene; the 2-tetraphenyl is selected from 1-2 ... The fluorene derivative group is selected from 9,9-dimethylfluorenyl, 9,9-diethylfluorenyl, 9,9-dipropylfluorenyl, 9,9-dibutylfluorenyl, 9,9-dipentylfluorenyl, 9,9-dihexylfluorenyl, 9,9-diphenylfluorenyl, 9,9-dinaphthylfluorenyl, 9,9'-spirodifluorenyl, and benzo[a]fluorenyl.

[0029] The C3-C60 heteroaryl (or C6-C50 heteroaryl) mentioned in this invention includes monocyclic heteroaryl and fused-ring heteroaryl, preferably C3-C30 heteroaryl, more preferably C4-C20 heteroaryl, and even more preferably C5-C12 heteroaryl. A monocyclic heteroaryl refers to a molecule containing at least one heteroaryl group. When a molecule contains one heteroaryl group and other groups (such as aryl, heteroaryl, alkyl, etc.), the heteroaryl group and the other groups are independent of each other and connected by a single bond. Examples of monocyclic heteroaryl groups include furanyl, thiophene, pyrrole, and pyridinyl. A fused-ring heteroaryl refers to a molecule containing at least one aromatic heterocycle and an aromatic ring (aromatic heterocycle or aromatic ring), and the two are not independent of each other but share two adjacent atoms fused together. Examples of fused-ring heteroaryl groups include: benzofuranyl, benzothiophenyl, isobenzofuranyl, indolyl, dibenzofuranyl, dibenzothiophenyl, carbazoyl, acridineyl, isobenzofuranyl, isobenzothiophenyl, benzocarbazoyl, azircarbazoyl, phenothiazinyl, phenothiazinyl, 9-phenylcarbazoyl, 9-naphthylcarbazoyl, dibenzocarbazoyl, indolocarbazoyl, etc.

[0030] The aryloxy or heteroaryloxy groups in this invention can be exemplified by the monovalent groups formed by the above-mentioned aryl or heteroaryl groups and oxygen.

[0031] In this invention, arylamino represents a group formed by replacing the hydrogen on an amino group with one or two aryl groups, wherein the linking site of the arylamino can be linked to the aryl group in the arylamino or to the N group in the arylamino, and the exemplary number of carbons and specific groups of the aryl group in the arylamino are the same as described above.

[0032] Examples of C6-C30 arylamino groups mentioned in this invention include phenylamino, methylphenylamino, naphthylamino, anthraceneylamino, phenanthreneamino, and biphenylamino.

[0033] Examples of C3-C30 heteroaryl amino groups mentioned in this invention include pyridinyl amino, pyrimidinyl amino, and dibenzofuranyl amino.

[0034] Unless otherwise specified, the chain alkyl groups mentioned in this invention include straight-chain alkyl groups and branched-chain alkyl groups. Specifically, substituted or unsubstituted C1-C30 chain alkyl groups are preferred, substituted or unsubstituted C1-C16 chain alkyl groups are more preferably substituted or unsubstituted C1-C10 chain alkyl groups. Examples of substituted or unsubstituted C1-C10 chain alkyl groups include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 2-methylbutyl, n-pentyl, sec-pentyl, neopentyl, n-hexyl, neohexyl, n-heptyl, n-octyl, 2-ethylhexyl, etc.

[0035] In this invention, the cycloalkyl group includes monocycloalkyl and polycycloalkyl; wherein, monocycloalkyl refers to an alkyl group containing a single ring structure; polycycloalkyl refers to a structure composed of two or more cycloalkyl groups sharing one or more carbon atoms on a ring; examples of C3-C20 cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, etc.

[0036] In this specification, the substituted or unsubstituted C1-C20 alkoxy group is preferably a substituted or unsubstituted C1-C10 alkoxy group. Examples of C1-C20 alkoxy groups include: methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy, isobutoxy, tert-butoxy, pentooxy, isopentoxy, hexoxy, heptoxy, octoxy, nonoxy, decoxy, undecoxy, dodecoxy, etc., among which methoxy, ethoxy, n-propoxy, isopropoxy, tert-butoxy, sec-butoxy, isobutoxy, isopentoxy, and more preferably methoxy.

[0037] In this specification, the substituted or unsubstituted C1-C20 silane and the substituted or unsubstituted C1-C10 silane are examples of silanes substituted with groups listed in the above-mentioned C1-C10 chain alkyl groups, specifically including: methylsilane, dimethylsilane, trimethylsilane, ethylsilane, diethylsilane, triethylsilane, tert-butyldimethylsilane, tert-butyldiphenylsilane, etc.

[0038] In this specification, the C2-C20 alkenyl group, preferably C2-C10 alkenyl group, is a hydrocarbon group containing at least one C=C double bond, and includes, but is not limited to: vinyl, propenyl, allyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, butadienyl, pentadienyl, etc.

[0039] It should be noted that while the possible effects of each group / feature have been described separately for ease of explanation in this application, this does not mean that these groups / features act in isolation. In fact, the reason for achieving good performance is essentially the optimized combination of the entire molecule, the result of the synergistic effect between various groups, rather than the effect of a single group.

[0040] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0041] Further preferably, in equations (1) and (2), rings C and D are each independently the structure shown in equation (a), (b), or (c), or any of the structures in equations (1-1), (1-2), and (1-3), and at least one of rings C and D is any of the structures in equations (1-1), (1-2), and (1-3); rings A and B are each independently the structure shown in equation (a), (b), or (c); ring E is the structure shown in equation (a); rings F, G, H, I, J, and K are each independently the structure shown in equation (a) or (b);

[0042]

[0043] In formulas (a), (b), and (c), the dashed double bonds represent the fusion position of the group in formula (1) or (2); any one of the dashed double bonds (b1), (b2), and (b3) represents the fusion position of the group in formula (b), and any one of the dashed double bonds (c1), (c2), and (c3) represents the fusion position of the group in formula (c).

[0044] In equations (a), (b), and (c), Z 1 Z 2 Z 3 Z 4 Z 5 Z 6 Z 7 Z 8 Z 9 Z 10 Z 11 Z 12 Each is independently selected from C, CH, or N;

[0045] In equation (c), Z is selected from O, S, and NR. 1 or CR 2 R 3 ;R 1 R 2 R 3 It is either not connected to adjacent groups or forms a ring through chemical bonds; R 2 With R 3 They are either not connected or connected in a loop; R 1 R 2 R 3 Each is independently selected from one of the following: unsubstituted or R”-substituted C1-C20 chain alkyl, unsubstituted or R”-substituted C3-C20 cycloalkyl, unsubstituted or R”-substituted C6-C60 aryl, and unsubstituted or R”-substituted C3-C60 heteroaryl;

[0046] "R" is selected from any one of deuterium, halogen, cyano, amino, C2-C20 alkenyl, C1-C20 chain alkyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 thioalkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C6-C60 aryl, and C3-C60 heteroaryl.

[0047] Further optimization, in formula (c), Z is selected from O, S, or NR. 1 ;R 1 It is either not connected to adjacent groups or is linked to form a ring through chemical bonds;

[0048] R 1 Selected from one of the following groups, either unsubstituted or R”-substituted: phenyl, naphthyl, anthracene, benzo[a]anthrayl, phenanthrene, benzo[a]phenanthrene, pyrene, fluoranyl, tetraphenyl, pentaphenyl, benzo[a]pyrene, biphenyl, amphylphenyl, terphenyl, trimerphenyl, tetraphenyl, fluorenyl, spirodifluorenyl, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis or trans indo[a]fluorenyl, trimerinyl, isotrimerininyl, spirotrimerininyl, spiroisotrimerininyl, furanyl, benzofuranyl, isobenzofuranyl, dibenzofuranyl, Thiopheneyl, benzothiopheneyl, isobenzothiopheneyl, dibenzothiopheneyl, pyrroleyl, isoindolyl, carbazoleyl, indocarbazoleyl, pyridyl, quinolinyl, isoquinolinyl, acridineyl, phenanthridineyl, benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indazoleyl, imidazolyl, benzimidazoleyl, naphthiazoleyl, phenanthrimidazoleyl, pyridiniumimidazoleyl, pyraziniumimidazoleyl, quinoxalolineimidazolyl, oxazolyl, benzooxazolyl, naphthiazoleyl, anthraquinoxazol 1,2-thiazolyl, 1,3-thiazolyl, benzothiazolyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, quinoxalinyl, 1,5-diazathanel, 2,7-diazapyrene, 2,3-diazapyrene, 1,6-diazapyrene, 1,8-diazapyrene, 4,5-diazapyrene, 4,5,9,10-tetraazaperyl, pyrazinyl, phenazinyl, phenthiazinyl, naphridinyl, azacarbazolyl, benzocarbaolinyl, phenanthrolinel, 1,2, 3-Triazolyl, 1,2,4-Triazolyl, Benzotriazolyl, 1,2,3-Oxadiazolyl, 1,2,4-Oxadiazolyl, 1,2,5-Oxadiazolyl, 1,2,3-Thiadiazolyl, 1,2,4-Thiadiazolyl, 1,2,5-Thiadiazolyl, 1,3,4-Thiadiazolyl, 1,3,5-Triazinyl, 1,2,4-Triazinyl, 1,2,3-Triazinyl, Tetrazolyl, 1,2,4,5-Tetraazinyl, 1,2,3,4-Tetraazinyl, 1,2,3,5-Tetraazinyl;

[0049] "R" is selected from one of the following: deuterium, cyano, C1-C6 chain alkyl, C3-C6 cycloalkyl, C1-C6 alkoxy, C6-C30 aryloxy, C6-C30 aryl, and C3-C30 heteroaryl.

[0050] Furthermore, in equations (1) and (2), rings A, B, F, G, H, I, J, and K each independently represent one of the aromatic rings of C6 to C30 and the heteroaromatic rings of C5 to C30, and ring E represents an aromatic ring of C6 to C30.

[0051] Preferably, ring A and ring B are each independently selected from phenyl, naphthyl, anthracene, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazole, indolocarbazole, benzothiophene, dibenzothiophene, thiophene, benzoanthrayl, phenanthrayl, pyrene, pyrene, peryl, fluoranyl, tetraphenyl, pentaphenyl, benzopyrene, biphenyl, amphyl, terphenyl, triphenyl, triphenyl, tetraphenyl, diphenyl, furanyl, benzofuranyl, isobenzofuranyl, dibenzofuranyl, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene, pyrrole The following are all groups of compounds: 1,2-thiazolyl, isoindolyl, carbazolyl, indocarbazolyl, pyridyl, quinolinyl, isoquinolinyl, acridineyl, phenanthridineyl, benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indazoleyl, imidazolyl, benzimidazoleyl, naphthimidazoleyl, phenanthridinemidazoleyl, pyridiniumimidazoleyl, pyraziniumimidazoleyl, quinoxaliniumimidazoleyl, oxazolyl, benzooxazolyl, naphthimidazoleyl, anthraquinoxazolyl, phenanthridinemidazoleyl, 1,2-thiazolyl, 1,3-thiazolyl, benzothiazolyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalylyl.

[0052] The ring E is selected from phenyl; the rings F, G, H, I, J, and K are each independently any one of phenyl, naphthyl, anthraceneyl, phenanthreneyl, benzo[a]phenanthreneyl, pyreneyl, pyrrolyl, peryl, fluoranthyl, tetraphenyl, pentaphenyl, benzo[a]pyreneyl, biphenyl, azophenyl, terphenyl, triphenyl, tetraphenyl, diphenyl, pyridyl, quinolinyl, isoquinolinyl, pyridazinyl, benzo[a]pyridazinyl, pyrimidinyl, benzo[a]pyrimidinyl, and quinoxalinyl.

[0053] More preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, phenanthryl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl; more preferably, ring E is selected from phenyl; more preferably, ring F, ring G, ring H, ring I, ring J, and ring K are each independently selected from any one of phenyl, naphthyl, anthraceneyl, phenanthryl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl.

[0054] More preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiopheneyl, dibenzothiopheneyl, and thiopheneyl; ring E is selected from phenyl; ring F, ring G, ring H, ring I, ring J, and ring K are each independently selected from any one of phenyl, naphthyl, anthraceneyl, phenanthryl, pyridinyl, pyridazinyl, and pyrimidinyl.

[0055] Most preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiophenyl, dibenzothiophenyl, and thiophenyl; and ring E, ring F, ring G, ring H, ring I, ring J, and ring K are all phenyl.

[0056] Further preferred embodiments of the present invention are as follows: in formulas (1) and (2), ring C and ring D are each independently represented as one of an aromatic ring of C6 to C30 and a heteroaromatic ring of C5 to C30, or ring C and ring D are each independently represented as formula (1-1) and formula (1-2). 、 Any structure in equation (1-3), and at least one of rings C and D is from equation (1-1) or equation (1-2). 、 Any structure in equation (1-3);

[0057] Preferably, one of ring C and ring D is any structure of formula (1-1), formula (1-2), or formula (1-3), and the other is the structure shown in formula (a), formula (b), or formula (c);

[0058] More preferably, only one of ring C and ring D is any one of the structures of formula (1-1), formula (1-2), and formula (1-3), and the other is selected from phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, benzoanthrayl, phenanthyl, pyrene, pyrene, peryl, fluoranyl, tetraphenyl, pentaphenyl, benzopyreneyl, biphenyl, amphyl, terphenyl, triphenyl, triphenyl, tetraphenyl, diphenyl, furanyl, benzofuranyl, isobenzofuranyl, dibenzofuranyl, thiopheneyl, benzothiopheneyl, etc. The following is a list of compounds: isobenzothiophene, dibenzothiophene, pyrrole, isoindolyl, carbazolyl, indoxcarbazolyl, pyridyl, quinolinyl, isoquinolinyl, acridinel, phenanthridinel, benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indoxolyl, imidazolyl, benzimidazolyl, naphthimidazolyl, phenanthridinemidazolyl, pyridiniumimidazolyl, pyraziniumimidazolyl, quinoxoliniumimidazolyl, oxazolyl, benzooxazolyl, naphthimidazolyl, anthraquinoxazolyl, phenanthridinemidazolyl, 1,2-thiazolyl, 1,3-thiazolyl, benzothiazolyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxolinyl.

[0059] More preferably, only one of ring C and ring D is any one of the structures of formula (1-1), formula (1-2), and formula (1-3), and the other is one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, phenanthrylyl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl.

[0060] Most preferably, only one of ring C and ring D is any one of the structures of formula (1-1), formula (1-2) and formula (1-3), and the other is one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiophenyl, dibenzothiophenyl, and thiophenyl.

[0061] Furthermore, the compounds of the present invention have the structure shown in formula (2-1) or formula (2-2):

[0062]

[0063] Among them, R a R b R c R d R e R f R gR h R i R j R k The definitions are the same as those in equations (1) and (2) above;

[0064] Rings C and D are each independently the structure shown in equation (a), (b), or (c), or any of the structures in equations (1-1), (1-2), and (1-3), and at least one of rings C and D is any of the structures in equations (1-1), (1-2), and (1-3); rings A and B are each independently the structure shown in equation (a), (b), or (c); the structure and definition of equations (a), (b), and (c) are the same as above;

[0065] Preferably, one of ring C and ring D has any structure from equations (1-1), (1-2), and (1-3), and the other has a structure from equation (a) or (b).

[0066] Or the structure shown in equation (c);

[0067] More preferably, in formulas (2-1) and (2-2), ring A and ring B are each independently selected from one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, phenanthryl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl.

[0068] Preferably, only one of ring C and ring D is any one of the structures of formula (1-1), formula (1-2), and formula (1-3), and the other is one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, phenanthrylyl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl.

[0069] Most preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthracene, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiophenyl, dibenzothiophenyl, and thiophenyl; only one of ring C and ring D is any structure of formula (1-1), formula (1-2), and formula (1-3), and the other is one of phenyl, naphthyl, anthracene, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiophenyl, dibenzothiophenyl, and thiophenyl.

[0070] More preferably, in the above formulas (1), (2), (2-1), and (2-2), the R... a R b R c R d R e R f R g R h R i R j R k Each group is independently selected from hydrogen, deuterium, halogen, cyano, or unsubstituted or R'-substituted groups of the following: C1-C10 chain alkyl, C3-C10 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkoxy, C6-C20 arylamino, C3-C20 heteroarylamino, C6-C30 aryl, C6-C30 aryloxy, and C5-C30 heteroaryl.

[0071] R' is selected from one of the following: deuterium, halogen, cyano, amino, C1-C10 chain alkyl, C3-C10 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkoxy, C1-C10 alkylsilyl, C1-C10 alkylamino, C6-C30 arylamino, C3-C30 heteroarylamino, C6-C30 aryloxy, C6-C30 aryl, and C3-C30 heteroaryl.

[0072] Preferably, the R a R b R c R d R e R f R g R h R i R j R kEach of the following substituents is independently selected from hydrogen, deuterium, cyano, halogen, or a combination of one or two of the following: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 2-methylbutyl, n-pentyl, sec-pentyl, cyclopentyl, neopentyl, n-hexyl, cyclohexyl, neohexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, 2-ethylhexyl, trifluoromethyl, pentafluoroethyl, 2,2,2-trifluoroethyl, phenyl, naphthyl, anthracene, benzo[a]anthrayl, phenanthrene, benzo[a]phenanthrene, pyrene, pyryl, peryl, fluoranyl, tetraphenyl, pentaphenyl, benzo[a]pyrene, biphenyl, amphyl, terphenyl, triphenyl, tetraphenyl, Fluorenyl, spirodifluorenyl, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis or trans indofluorenyl, trimerinyl, isotrimericininyl, spirotrimericininyl, spiroisotrimericininyl, furanyl, benzofuranyl, isobenzofuranyl, dibenzofuranyl, thiopheneyl, benzothiopheneyl, isobenzothiopheneyl, dibenzothiopheneyl, pyrroleyl, isoindoleyl, carbazoleyl, indocarbazoleyl, pyridinyl, quinolinyl, isoquinolinyl, acridineyl, phenanthridineyl, benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indazoleyl, imidazoyl, benzimidazoleyl, naphthizimidazoleyl, phenanthrenezimidazoleyl, pyridinium imidazoyl, pyrazine Imidazolyl, quinoxaloylimidazolyl, oxazolyl, benzoxoxazolyl, naphthoxazolyl, anthraxoxazolyl, phenanthoxazolyl, 1,2-thiazolyl, 1,3-thiazolyl, benzothiazolyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, quinoxaloyl, 1,5-diazaanthrayl, 2,7-diazapyrene, 2,3-diazapyrene, 1,6-diazapyrene, 1,8-diazapyrene, 4,5-diazapyrene, 4,5,9,10-tetraazaperyl, pyrazinyl, phenazinyl, phenothiazinyl, naphridinyl, azacarbazolyl, benzocarbazolyl, phenanthrolinel, 1,2,3-triazolyl, 1,2,4-triazolyl Benzotriazolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,2,3-thiadiazolyl, 1,2,4-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,4-thiadiazolyl, 1,3,5-triazinyl, 1,2,4-triazinyl, 1,2,3-triazinyl, tetrazolyl, 1,2,4,5-tetraazinyl, 1,2,3,4-tetraazinyl, 1,2,3,5-tetraazinyl, purinyl, pteridyl, indazyl, benzothiadiazolyl, 9,9-dimethylacridyl, triarylamine, adamantane, fluorophenyl, methylphenyl, trimethylphenyl, cyanophenyl or methoxy;

[0073] More preferably, the R a R b R c R d R e R f Rg R h R i R j R k Each of the following groups is independently selected from hydrogen, deuterium, cyano, halogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, 2-methylbutyl, trifluoromethyl, pentafluoroethyl, phenyl, naphthyl, anthracene, benzo[a]anthrayl, phenanthrene, benzo[a]phenanthrene, pyrene, fluoranyl, tetraphenyl, pentaphenyl, benzo[a]pyrene, biphenyl, amphyl, terphenyl, triphenyl, tetraphenyl, fluorenyl, spirodifluorenyl, furanyl, benzo[a]furanyl, isobenzo[a]furanyl, dibenzo[a]furanyl, thienyl, benzo[a]thienyl, isobenzo[a]thienyl, dibenzo[a]thienyl, pyrroleyl, isoindoleyl, carbazoleyl, indoxocarbazoleyl, pyridyl, quinolinyl, isoquinolinyl, pyrazolyl, indazoleyl, imidazolyl. Pyridazinyl, pyrimidinyl, benzopyrimidinyl, quinoxalinyl, pyrazinyl, phenazinyl, phenothiazinyl, naphridinyl, azacarbazolyl, benzocarbazolyl, phenanthrolinel, 1,2,3-triazolyl, 1,2,4-triazolyl, benzotriazolyl, 1,2,3-oxadiazolyl, 1,2,3-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,4-thiadiazolyl, 1,3,5-triazinyl, 1,2,4-triazinyl, 1,2,3-triazinyl, tetrazolyl, 1,2,4,5-tetraazinyl, inazinyl, benzothiadiazolyl, 9,9-dimethylacridinyl, triarylamine, adamantane, fluorophenyl, methylphenyl, trimethylphenyl, cyanophenyl, or methoxy.

[0074] Furthermore, the general formula compounds of the present invention can preferably include the following specific structural compounds A1 to A228, which are merely representative examples:

[0075]

[0076]

[0077]

[0078]

[0079]

[0080]

[0081]

[0082]

[0083]

[0084]

[0085]

[0086]

[0087] In the compounds of the present invention with the structure shown in formula (1) or formula (2), at least one of ring C and ring D is any structure of formula (1-1), formula (1-2), or formula (1-3). In the structures of formula (1-1), formula (1-2), and formula (1-3), the benzene rings connected by the carbazole N atom are connected by a screw structure, which connects the two benzene rings, eliminates the original repulsion between hydrogen atoms, and makes the benzene rings connected by the carbazole N atom unable to rotate freely, which significantly enhances the rigidity of the molecule, further reduces the half-width at half-maximum (FWHM) (≤25nm), improves the color purity, and significantly improves the efficiency and lifetime of the corresponding light-emitting device. Furthermore, the core structure of the compound of the present invention is based on the traditional BN core structure, with rings A and E locked by a carbazole spiro structure, and / or rings D and E, thereby suppressing the problem of reduced stability caused by the repulsion of hydrogen atoms between the two rings. Moreover, this spiro structure is beneficial to increase intermolecular interactions to weaken the problem of reduced efficiency, light color and lifetime caused by molecular stacking, thereby realizing the development and preparation of high-efficiency, stable and light-pure OLED device light-emitting materials.

[0088] This invention has verified through extensive experiments that the electroluminescence spectrum of OLED devices prepared using the compounds of this invention has a narrow half-width (WHM) (≤25nm), which greatly enriches the framework system of multiple resonance narrow-spectrum materials, while greatly simplifying the synthesis process and improving the reaction yield. The corresponding electroluminescent devices have high luminous efficiency and extremely long lifespan, which can meet the requirements of current panel manufacturers for high-performance materials and show good application prospects in industrialization.

[0089] A second objective of this invention is to provide an application of the compounds described in the first objective, specifically their application as functional materials in organic electronic devices, such as organic electroluminescent devices, optical sensors, solar cells, organic thin-film transistors, or organic field-effect transistors. These compounds of the present invention are suitable for use as light-emitting layer materials in organic electroluminescent devices, specifically as light-emitting materials in the light-emitting layer.

[0090] A third objective of this invention is to provide an organic electroluminescent device. Specifically, an embodiment of this invention provides an organic electroluminescent device comprising a substrate, and an anode layer, a plurality of light-emitting functional layers, and a cathode layer sequentially formed on the substrate; the light-emitting functional layers include a hole injection layer, a hole transport layer, a light-emitting layer, and an electron transport layer, wherein the hole injection layer is formed on the anode layer, the hole transport layer is formed on the hole injection layer, the cathode layer is formed on the electron transport layer, and the light-emitting layer is located between the hole transport layer and the electron transport layer; preferably, the light-emitting layer contains a compound of the general formula of this invention shown in any of the above general formulas, or the light-emitting layer contains at least one of the specific compounds A1 to A228 mentioned above.

[0091] The fourth objective of this invention is to provide a display device, including the aforementioned organic electroluminescent device. Detailed Implementation

[0092] The specific preparation methods of the above-mentioned new compounds of the present invention will be described in detail below using several synthetic examples, but the preparation methods of the present invention are not limited to these synthetic examples.

[0093] All the chemical reagents used in this invention, such as petroleum ether, tert-butylbenzene, sodium sulfate, toluene, dichloromethane, cesium carbonate, sodium hydride, boron tribromide, tetrahydrofuran, N,N-dimethylformamide, n-butyllithium, and reaction intermediates, were purchased from Shanghai Titan Technology Co., Ltd. and Xilong Chemical Co., Ltd. The mass spectrometer used to determine the following compounds was a ZAB-HS type mass spectrometer (manufactured by Micromass, UK).

[0094] The synthesis method of the compound of the present invention is briefly described below. First, carbazole and indolecarbazole derivatives are reacted with polyhalogenated benzenes using a nucleophilic substitution reaction to obtain brominated intermediate I. Then, after lithium halide exchange with n-butyllithium, nucleophilic addition occurs with a ketone compound, followed by acidification and cyclization to obtain intermediate II. Finally, under the action of tert-butyllithium, electrophilic boronization with boron tribromide is carried out to obtain the target compound.

[0095] Synthesis Examples

[0096] Example 1: Synthesis of Compound A1

[0097]

[0098] In a 100 mL dry double-necked round-bottom flask, add polyhalogenated benzene (3 mmol), carbazole and indolecarbazole derivatives (3 mmol each), Cs₂CO₃ (15 mmol), and DMF (100 mL). Under a nitrogen atmosphere, heat to 150 °C and reflux for 24 h. After the reaction is complete, allow to cool naturally to room temperature, remove the solvent by rotary evaporation, and separate the crude product by silica gel column chromatography using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain intermediate compound A1-1.

[0099] In a double-necked flask under a nitrogen atmosphere, the brominated precursor A1-1 (5 mmol) was dissolved in 10 mL of dry tetrahydrofuran and cooled to -78 °C. A pentane solution of n-butyllithium (1 M, 6 mL) was added, and the reaction was allowed to proceed at this temperature for 1 hour. The carbonyl reactant (6 mmol) was dissolved in 20 mL of dry tetrahydrofuran pre-cooled to -78 °C. This solution was then slowly injected into the A1-1 solution at -78 °C, and the mixture was slowly brought to room temperature and reacted for 12 hours. After the reaction was complete, a small amount of methanol was added to quench the reaction. The solvent was evaporated under reduced pressure, and 50 mL of glacial acetic acid and 5 mL of concentrated hydrochloric acid were added. The mixture was then heated to reflux. After reacting for 2 hours, the mixture was neutralized with a saturated sodium carbonate aqueous solution. The organic phase was extracted with dichloromethane and collected. The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated. The compound was separated by silica gel column chromatography using petroleum ether:dichloromethane = 5:1 as the developing solvent to obtain compound A1-2.

[0100] Compound A1-2 (1 mmol) was dissolved in 20 mL of tert-butylbenzene in a sealed tube. After cooling to -78 °C, a pentane solution of tert-butyllithium (1 M, 2.5 mL) was added, followed by heating to 30 °C and reacting for 1 hour. The mixture was then cooled again to -78 °C, and boron tribromide (3 mmol) was slowly added, followed by heating to 30 °C and stirring for another hour. After cooling to 0 °C, diisopropylethylamine (5 mmol) was added, followed by heating to 160 °C and reacting for 12 hours. The solvent was removed under vacuum, and the mixture was passed through a silica gel column using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain the target compound A1.

[0101] Example 2 Synthesis of compound A2

[0102]

[0103] In a 100 mL dry double-necked round-bottom flask, add 3 mmol of polyhalogenated benzene, 3 mmol each of carbazole and indolecarbazole derivatives, 15 mmol of Cs₂CO₃, and 100 mL of DMF. Under a nitrogen atmosphere, heat to 150 °C and reflux for 24 h. After the reaction is complete, allow to cool naturally to room temperature, remove the solvent by rotary evaporation, and separate the crude product by silica gel column chromatography using petroleum ether:dichloromethane = 15:1 as the developing solvent to obtain intermediate compound A2-1.

[0104] In a double-necked flask under a nitrogen atmosphere, the brominated precursor A2-1 (5 mmol) was dissolved in 10 mL of dry tetrahydrofuran and cooled to -78 °C. A pentane solution of n-butyllithium (1 M, 6 mL) was added, and the reaction was allowed to proceed at this temperature for 1 hour. The carbonyl reactant (6 mmol) was dissolved in 20 mL of dry tetrahydrofuran pre-cooled to -78 °C. This solution was then slowly injected into the A2-1 solution at -78 °C, and the mixture was slowly brought to room temperature and reacted for 12 hours. After the reaction was complete, a small amount of methanol was added to quench the reaction. The solvent was evaporated under reduced pressure, and 50 mL of glacial acetic acid and 5 mL of concentrated hydrochloric acid were added. The mixture was then heated to reflux. After reacting for 2 hours, the mixture was neutralized with a saturated sodium carbonate aqueous solution. The organic phase was extracted with dichloromethane and collected. The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated. The compound was separated by silica gel column chromatography using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain compound A2-2.

[0105] Compound A2-2 (1 mmol) was dissolved in 20 mL of tert-butylbenzene in a sealed tube. After cooling to -78 °C, a pentane solution of tert-butyllithium (1 M, 2.5 mL) was added, followed by heating to 30 °C and reacting for 1 hour. The mixture was then cooled again to -78 °C, and boron tribromide (3 mmol) was slowly added, followed by heating to 30 °C and stirring for another hour. After cooling to 0 °C, diisopropylethylamine (5 mmol) was added, followed by heating to 160 °C and reacting for 12 hours. The solvent was removed under vacuum, and the mixture was passed through a silica gel column using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain the target compound A2.

[0106] Example 3 Synthesis of compound A4

[0107]

[0108] In a 100 mL dry double-necked round-bottom flask, add 3 mmol of polyhalogenated benzene, 3 mmol each of carbazole and indolecarbazole derivatives, 15 mmol of Cs₂CO₃, and 100 mL of DMF. Under a nitrogen atmosphere, heat to 150 °C and reflux for 24 h. After the reaction is complete, allow to cool naturally to room temperature, remove the solvent by rotary evaporation, and separate the crude product by silica gel column chromatography using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain intermediate compound A4-1.

[0109] In a double-necked flask under a nitrogen atmosphere, the brominated precursor A4-1 (5 mmol) was dissolved in 10 mL of dry tetrahydrofuran and cooled to -78 °C. A pentane solution of n-butyllithium (1 M, 6 mL) was added, and the reaction was allowed to proceed at this temperature for 1 hour. The carbonyl reactant (6 mmol) was dissolved in 20 mL of dry tetrahydrofuran pre-cooled to -78 °C. This solution was then slowly injected into the A4-1 solution at -78 °C, and the mixture was slowly brought to room temperature and reacted for 12 hours. After the reaction was complete, a small amount of methanol was added to quench the reaction. The solvent was evaporated under reduced pressure, and 50 mL of glacial acetic acid and 5 mL of concentrated hydrochloric acid were added. The mixture was then heated to reflux. After reacting for 2 hours, the mixture was neutralized with a saturated sodium carbonate aqueous solution. The organic phase was extracted with dichloromethane and collected. The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated. The compound A4-2 was separated by silica gel column chromatography using petroleum ether:dichloromethane = 15:1 as the developing solvent.

[0110] Compound A4-2 (1 mmol) was dissolved in 20 mL of tert-butylbenzene in a sealed tube. After cooling to -78 °C, a pentane solution of tert-butyllithium (1 M, 2.5 mL) was added, followed by heating to 30 °C and reacting for 1 hour. The mixture was then cooled again to -78 °C, and boron tribromide (3 mmol) was slowly added, followed by heating to 30 °C and stirring for another hour. After cooling to 0 °C, diisopropylethylamine (5 mmol) was added, followed by heating to 160 °C and reacting for 12 hours. The solvent was removed under vacuum, and the mixture was passed through a silica gel column using petroleum ether:dichloromethane = 15:1 as the developing solvent to obtain the target compound A4.

[0111] Example 4 Synthesis of compound A16

[0112]

[0113] In a 100 mL dry double-necked round-bottom flask, add 3 mmol of polyhalogenated benzene, 3 mmol each of carbazole and indolecarbazole derivatives, 15 mmol of Cs₂CO₃, and 100 mL of DMF. Under a nitrogen atmosphere, heat to 150 °C and reflux for 24 h. After the reaction is complete, allow to cool naturally to room temperature, remove the solvent by rotary evaporation, and separate the crude product by silica gel column chromatography using petroleum ether:dichloromethane = 15:1 as the developing solvent to obtain intermediate compound A16-1.

[0114] In a double-necked flask under a nitrogen atmosphere, the brominated precursor A16-1 (5 mmol) was dissolved in 10 mL of dry tetrahydrofuran and cooled to -78 °C. A pentane solution of n-butyllithium (1 M, 6 mL) was added, and the reaction was allowed to proceed at this temperature for 1 hour. The carbonyl reactant (6 mmol) was dissolved in 20 mL of dry tetrahydrofuran pre-cooled to -78 °C. This solution was then slowly injected into the A16-1 solution at -78 °C, and the temperature was slowly raised to room temperature for 12 hours. After the reaction was complete, a small amount of methanol was added to quench the reaction. The solvent was evaporated under reduced pressure, and 50 mL of glacial acetic acid and 5 mL of concentrated hydrochloric acid were added. The mixture was then heated to reflux. After reacting for 2 hours, the mixture was neutralized with a saturated sodium carbonate aqueous solution. The organic phase was extracted with dichloromethane and collected. The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated. The compound was separated by silica gel column chromatography using petroleum ether:dichloromethane = 15:1 as the developing solvent to obtain compound A16-2.

[0115] Compound A16-2 (1 mmol) was dissolved in 20 mL of tert-butylbenzene in a sealed tube. After cooling to -78 °C, a pentane solution of tert-butyllithium (1 M, 2.5 mL) was added, followed by heating to 30 °C and reacting for 1 hour. The mixture was then cooled again to -78 °C, and boron tribromide (3 mmol) was slowly added, followed by heating to 30 °C and stirring for another hour. After cooling to 0 °C, diisopropylethylamine (5 mmol) was added, followed by heating to 160 °C and reacting for 12 hours. The solvent was removed under vacuum, and the mixture was passed through a silica gel column using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain the target compound A16.

[0116] Example 5 Synthesis of Compound A20

[0117]

[0118] In a 100 mL dry double-necked round-bottom flask, add polyhalogenated benzene (3 mmol), carbazole and indolecarbazole derivatives (3 mmol each), Cs₂CO₃ (15 mmol), and DMF (100 mL). Under a nitrogen atmosphere, heat to 150 °C and reflux for 24 h. After the reaction is complete, allow to cool naturally to room temperature, remove the solvent by rotary evaporation, and separate the crude product by silica gel column chromatography using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain intermediate compound A20-1.

[0119] In a double-necked flask under a nitrogen atmosphere, the brominated precursor A20-1 (5 mmol) was dissolved in 10 mL of dry tetrahydrofuran and cooled to -78 °C. A pentane solution of n-butyllithium (1 M, 6 mL) was added, and the reaction was allowed to proceed at this temperature for 1 hour. The carbonyl reactant (6 mmol) was dissolved in 20 mL of dry tetrahydrofuran pre-cooled to -78 °C. This solution was then slowly injected into the A20-1 solution at -78 °C, and the mixture was slowly brought to room temperature and reacted for 12 hours. After the reaction was complete, a small amount of methanol was added to quench the reaction. The solvent was evaporated under reduced pressure, and 50 mL of glacial acetic acid and 5 mL of concentrated hydrochloric acid were added. The mixture was then heated to reflux. After reacting for 2 hours, the mixture was neutralized with a saturated sodium carbonate aqueous solution. The organic phase was extracted with dichloromethane and collected. The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated. The compound was separated by silica gel column chromatography using petroleum ether:dichloromethane = 5:1 as the developing solvent to obtain compound A20-2.

[0120] Compound A20-2 (1 mmol) was dissolved in 20 mL of tert-butylbenzene in a sealed tube. After cooling to -78 °C, a pentane solution of tert-butyllithium (1 M, 2.5 mL) was added, followed by heating to 30 °C and reacting for 1 hour. The mixture was then cooled again to -78 °C, and boron tribromide (3 mmol) was slowly added, followed by heating to 30 °C and stirring for another hour. After cooling to 0 °C, diisopropylethylamine (5 mmol) was added, followed by heating to 160 °C and reacting for 12 hours. The solvent was removed under vacuum, and the mixture was passed through a silica gel column using petroleum ether:dichloromethane = 5:1 as the developing solvent to obtain the target compound A20.

[0121] Example 6 Synthesis of Compound A25

[0122]

[0123] In a 100 mL dry double-necked round-bottom flask, add polyhalogenated benzene (3 mmol), carbazole and indolecarbazole derivatives (3 mmol each), Cs₂CO₃ (15 mmol), and DMF (100 mL). Under a nitrogen atmosphere, heat to 150 °C and reflux for 24 h. After the reaction is complete, allow to cool naturally to room temperature, remove the solvent by rotary evaporation, and separate the crude product by silica gel column chromatography using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain intermediate compound A25-1.

[0124] In a double-necked flask under a nitrogen atmosphere, the brominated precursor A25-1 (5 mmol) was dissolved in 10 mL of dry tetrahydrofuran and cooled to -78 °C. A pentane solution of n-butyllithium (1 M, 6 mL) was added, and the reaction was allowed to proceed at this temperature for 1 hour. The carbonyl reactant (6 mmol) was dissolved in 20 mL of dry tetrahydrofuran pre-cooled to -78 °C. This solution was then slowly injected into the A25-1 solution at -78 °C, and the mixture was slowly brought to room temperature and reacted for 12 hours. After the reaction was complete, a small amount of methanol was added to quench the reaction. The solvent was evaporated under reduced pressure, and 50 mL of glacial acetic acid and 5 mL of concentrated hydrochloric acid were added. The mixture was then heated to reflux. After reacting for 2 hours, the mixture was neutralized with a saturated sodium carbonate aqueous solution. The organic phase was extracted with dichloromethane and collected. The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated. The compound was separated by silica gel column chromatography using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain compound A25-2.

[0125] Compound A25-2 (1 mmol) was dissolved in 20 mL of tert-butylbenzene in a sealed tube. After cooling to -78 °C, a pentane solution of tert-butyllithium (1 M, 2.5 mL) was added, followed by heating to 30 °C and reacting for 1 hour. The mixture was then cooled again to -78 °C, and boron tribromide (3 mmol) was slowly added, followed by heating to 30 °C and stirring for another hour. After cooling to 0 °C, diisopropylethylamine (5 mmol) was added, followed by heating to 160 °C and reacting for 12 hours. The solvent was removed under vacuum, and the mixture was passed through a silica gel column using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain the target compound A25.

[0126] The synthesis methods of the following synthetic examples 7-24 are similar to those of examples 1-6 above. The only difference is that the carbazole and indolecarbazole derivatives in the first step are replaced with the corresponding carbazole and indolecarbazole derivatives, and the carbonyl reactants in the second step are replaced with the corresponding carbonyl reactants.

[0127]

[0128]

[0129] Example 25 Synthesis of compound A206

[0130]

[0131] In a 100 mL dry double-necked round-bottom flask, add polyhalogenated benzene (3 mmol), carbazole and indolecarbazole derivatives (3 mmol each), Cs₂CO₃ (15 mmol), and DMF (100 mL). Under a nitrogen atmosphere, heat to 150 °C and reflux for 24 h. After the reaction is complete, allow to cool naturally to room temperature, remove the solvent by rotary evaporation, and separate the crude product by silica gel column chromatography using petroleum ether:dichloromethane = 5:1 as the developing solvent to obtain the intermediate compound A206-1.

[0132] In a double-necked flask under a nitrogen atmosphere, the brominated precursor A206-1 (5 mmol) was dissolved in 10 mL of dry tetrahydrofuran and cooled to -78 °C. A pentane solution of n-butyllithium (1 M, 12 mL) was added, and the reaction was allowed to proceed at this temperature for 1 hour. The carbonyl reactant (12 mmol) was dissolved in 40 mL of dry tetrahydrofuran pre-cooled to -78 °C. This solution was then slowly injected into the A206-1 solution at -78 °C, and the mixture was slowly brought to room temperature and reacted for 12 hours. After the reaction was complete, a small amount of methanol was added to quench the reaction. The solvent was evaporated under reduced pressure, and 100 mL of glacial acetic acid and 10 mL of concentrated hydrochloric acid were added. The mixture was then heated to reflux. After reacting for 2 hours, the mixture was neutralized with a saturated sodium carbonate aqueous solution. The organic phase was extracted with dichloromethane and collected. The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated. The compound was separated by silica gel column chromatography using petroleum ether:dichloromethane = 15:1 as the developing solvent to obtain compound A206-2.

[0133] Compound A206-2 (1 mmol) was dissolved in 20 mL of tert-butylbenzene in a sealed tube. After cooling to -78 °C, a pentane solution of tert-butyllithium (1 M, 2.5 mL) was added, followed by heating to 30 °C and reacting for 1 hour. The mixture was then cooled again to -78 °C, and boron tribromide (3 mmol) was slowly added, followed by heating to 30 °C and stirring for another hour. After cooling to 0 °C, diisopropylethylamine (5 mmol) was added, followed by heating to 160 °C and reacting for 12 hours. The solvent was removed under vacuum, and the mixture was passed through a silica gel column using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain the target compound A206.

[0134] Example 26 Synthesis of compound A214

[0135]

[0136] In a 100 mL dry double-necked round-bottom flask, add polyhalogenated benzene (3 mmol), carbazole and indolecarbazole derivatives (3 mmol each), Cs₂CO₃ (15 mmol), and DMF (100 mL). Under a nitrogen atmosphere, heat to 150 °C and reflux for 24 h. After the reaction is complete, allow to cool naturally to room temperature, remove the solvent by rotary evaporation, and separate the crude product by silica gel column chromatography using petroleum ether:dichloromethane = 10:1 as the developing solvent to obtain intermediate compound A214-1.

[0137] In a double-necked flask under a nitrogen atmosphere, the brominated precursor A214-1 (5 mmol) was dissolved in 10 mL of dry tetrahydrofuran and cooled to -78 °C. A pentane solution of n-butyllithium (1 M, 12 mL) was added, and the reaction was carried out at this temperature for 1 hour. The carbonyl reactant (12 mmol) was dissolved in 40 mL of dry tetrahydrofuran pre-cooled to -78 °C. This solution was then slowly injected into the A214-1 solution at -78 °C, and the mixture was slowly brought to room temperature and reacted for 12 hours. After the reaction was complete, a small amount of methanol was added to quench the reaction, the solvent was evaporated under reduced pressure, 100 mL of glacial acetic acid and 10 mL of concentrated hydrochloric acid were added, and the mixture was then heated to reflux. After reacting for 2 hours, the mixture was neutralized with a saturated sodium carbonate aqueous solution, extracted with dichloromethane, and the organic phase was collected. The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated. The compound was separated by silica gel column chromatography using petroleum ether:dichloromethane = 15:1 as the developing solvent to obtain compound A214-2.

[0138] Compound A214-2 (1 mmol) was dissolved in 20 mL of tert-butylbenzene in a sealed tube. After cooling to -78 °C, a pentane solution of tert-butyllithium (1 M, 2.5 mL) was added, followed by heating to 30 °C and reacting for 1 hour. The mixture was then cooled again to -78 °C, and boron tribromide (3 mmol) was slowly added, followed by heating to 30 °C and stirring for another hour. After cooling to 0 °C, diisopropylethylamine (5 mmol) was added, followed by heating to 160 °C and reacting for 12 hours. The solvent was removed under vacuum, and the mixture was passed through a silica gel column using petroleum ether:dichloromethane = 5:1 as the developing solvent to obtain the target compound A214.

[0139] The synthesis methods of the following synthetic examples 27-28 are similar to those of examples 1-26 above. The only difference is that the polyhalogenated benzene, carbazole and indolecarbazole derivatives in the first step are replaced with the corresponding polyhalogenated benzene, carbazole and indolecarbazole derivatives, and the carbonyl reactants in the second step are replaced with the corresponding carbonyl reactants.

[0140]

[0141] The specific experimental results of synthesis examples 1-28 are as follows:

[0142]

[0143]

[0144] Note: The HPLC instrument used was a Shimadzu Nexera LC-40 series liquid chromatograph. The MALDI-TOF-MS instrument used was a Shimadzu AXIMA Performance MALDI-TOF. The elemental analysis instrument used was a Thermo Fisher FlashSmart elemental analyzer.

[0145] Device Examples

[0146] The technical effects and advantages of the present invention will be demonstrated and verified by specifically applying the compounds of the present invention to organic electroluminescent devices and testing their actual performance.

[0147] An organic electroluminescent device includes a first electrode, a second electrode, and an organic material layer located between the two electrodes. This organic material layer can be further divided into multiple regions; for example, it may include a hole transport region, a light-emitting layer, and an electron transport region.

[0148] The anode material can be any combination of transparent conductive oxide materials such as indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO2), and zinc oxide (ZnO). The cathode material can be any combination of metals or alloys such as magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), and magnesium-silver (Mg-Ag).

[0149] The hole transport region is located between the anode and the light-emitting layer. The hole transport region can be a single-layer hole transport layer (HTL), including a single-layer hole transport layer containing only one compound and a single-layer hole transport layer containing multiple compounds. The hole transport region can also be a multilayer structure including at least one of a hole injection layer (HIL), a hole transport layer (HTL), and an electron blocking layer (EBL).

[0150] The material for the hole transport region can be selected from, but is not limited to, phthalocyanine derivatives such as CuPc, conductive polymers or polymers containing conductive dopants such as polyphenylene oxide, polyaniline / dodecylbenzenesulfonic acid (Pani / DBSA), poly(3,4-ethylenedioxythiophene) / poly(4-styrenesulfonate) (PEDOT / PSS), polyaniline / camphorsulfonic acid (Pani / CSA), polyaniline / poly(4-styrenesulfonate) (Pani / PSS), aromatic amine derivatives, etc.

[0151] The emissive layer includes luminescent dyes (i.e., dopants) that can emit different wavelengths of light, and may also include a host material. The emissive layer can be a monochromatic emissive layer emitting a single color such as red, green, or blue. Multiple monochromatic emissive layers of different colors can be arranged in a planar pattern according to pixel design, or they can be stacked together to form a colored emissive layer. When different colored emissive layers are stacked together, they can be separated from each other or connected to each other. The emissive layer can also be a single colored emissive layer that simultaneously emits different colors such as red, green, and blue.

[0152] The electron transport region can be a single-layer electron transport layer (ETL), including a single-layer electron transport layer containing only one compound and a single-layer electron transport layer containing multiple compounds. The electron transport region can also be a multilayer structure including at least one of an electron injection layer (EIL), an electron transport layer (ETL), and a hole blocking layer (HBL).

[0153] Specifically, the method for fabricating the organic electroluminescent device of the present invention includes the following steps:

[0154] 1. The glass plate coated with the anodic material is ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in a mixture of acetone and ethanol, baked in a clean environment until all moisture is removed, cleaned with ultraviolet light and ozone, and bombarded with a low-energy cation beam.

[0155] 2. Place the glass plate with the anode in a vacuum chamber and evacuate it to 1×10-5~9×10-3 Pa. Vacuum deposit hole injection material on the anode film to form a hole injection layer. The deposition rate is 0.1-0.5 nm / s.

[0156] 3. A hole transport layer is formed by vacuum evaporation of a hole transport material on top of the hole injection layer, with an evaporation rate of 0.1-0.5 nm / s.

[0157] 4. An electron blocking layer is vacuum-deposited on top of the hole transport layer at a deposition rate of 0.1-0.5 nm / s;

[0158] 5. An organic light-emitting layer of the device is vacuum-deposited on top of the electron blocking layer. The organic light-emitting layer material includes a host material and a light-emitting dye. By using a multi-source co-evaporation method, the evaporation rate of the host material, the evaporation rate of the sensitizer material, and the evaporation rate of the dye are adjusted to make the dye reach a preset doping ratio.

[0159] 6. A hole blocking layer is vacuum-deposited on the organic light-emitting layer at a deposition rate of 0.1-0.5 nm / s;

[0160] 7. An electron transport layer is formed by vacuum evaporating the electron transport material of the device on top of the hole blocking layer, with an evaporation rate of 0.1-0.5 nm / s;

[0161] 8. A LiF layer is vacuum-deposited at 0.1-0.5 nm / s as the electron injection layer on the electron transport layer, and an Al layer is vacuum-deposited at 0.1-0.5 nm / s as the cathode of the device.

[0162] This invention also provides a display device, which includes the organic electroluminescent device as described above. Specifically, the display device can be an OLED display or other display device, as well as any product or component with display function, such as a television, digital camera, mobile phone, or tablet computer, that includes the display device. The advantages of this display device over the prior art are the same as those of the organic electroluminescent device described above, and will not be repeated here.

[0163] The organic electroluminescent device of the present invention will be further described below through specific embodiments.

[0164] Device Example 1

[0165] The structure of the organic electroluminescent device prepared in this embodiment is shown below:

[0166] ITO / HI(5nm) / HT(25nm) / EBL(12nm) / Host:3wt%A1(40nm) / HBL(6nm) / ET(25nm) / LiF(0.7nm) / Al(150nm)

[0167] In this embodiment, the anode material is ITO; the hole injection layer material is HI, with a total thickness of 5-30 nm (5 nm in this example); the hole transport layer material is HT, with a total thickness of 5-500 nm (25 nm in this example); the electron blocking layer material is EBL, with a total thickness of 0-30 nm (12 nm in this example); the host is the main material of the wide bandgap organic light-emitting layer, Al is a dye with a doping concentration of 3 wt%, and the thickness of the organic light-emitting layer is generally 1-200 nm (40 nm in this example); the hole blocking layer material is HBL, with a total thickness of 0-30 nm (6 nm in this example); the electron transport layer material is ET, with a thickness of 5-300 nm (25 nm in this example); and the electron injection layer and cathode materials are LiF (0.7 nm) and metallic aluminum (150 nm).

[0168] Device Example 2

[0169] The structure of the organic electroluminescent device prepared in this embodiment is shown below:

[0170] ITO / HI(5nm) / HT(25nm) / EBL(12nm) / Host:40wt%TD:3wt%A1(40nm) / HBL(6nm) / ET(25nm) / LiF(0.7nm) / Al(150nm)

[0171] In this embodiment, the anode material is ITO; the hole injection layer material is HI, with a total thickness of 5-30 nm (5 nm in this example); the hole transport layer material is HT, with a total thickness of 5-500 nm (25 nm in this example); the electron blocking layer material is EBL, with a total thickness of 0-30 nm (12 nm in this example); the host is the main material of the wide bandgap organic light-emitting layer, TD is a TADF type host with a doping concentration of 40 wt%, Al is a dye with a doping concentration of 3 wt%, and the thickness of the organic light-emitting layer is generally 1-200 nm (40 nm in this example); the hole blocking layer material is HBL, with a total thickness of 0-30 nm (6 nm in this example); the electron transport layer material is ET, with a thickness of 5-300 nm (25 nm in this example); and the electron injection layer and cathode materials are LiF (0.7 nm) and aluminum (150 nm).

[0172] Device Examples 1 and 2 are respectively non-sensitized and sensitized devices for dye A1.

[0173] Examples 3-56 of this invention are the same as those in Device Examples 1 and 2, except that the dye is replaced with the compound of this invention. They are also divided into two groups: unsensitized and sensitized devices. Comparative Examples 1-6 are parallel comparative devices prepared using existing compounds P1, P2, and P3 according to the same preparation method as the compounds of this invention. The structural schemes of all prepared devices are shown in Table 1 below:

[0174] Table 1:

[0175]

[0176]

[0177]

[0178]

[0179] The anode material is ITO; the hole injection layer material is HI, with a total thickness of 5-30 nm (5 nm in this embodiment); the hole transport layer material is HT, with a total thickness of 5-500 nm (25 nm in this embodiment); the electron blocking layer material is EBL, with a total thickness of 0-30 nm (12 nm in this embodiment); the host organic light-emitting layer has a wide bandgap substrate material, TD is a TADF type substrate, and the thickness of the organic light-emitting layer is 1-200 nm (40 nm in this embodiment); the hole blocking layer material is HBL, with a total thickness of 0-30 nm (6 nm in this embodiment); the electron transport layer material is ET, with a thickness of 5-300 nm (25 nm in this embodiment); the electron injection layer and cathode materials are LiF (0.7 nm) and metallic aluminum (150 nm).

[0180] The structural formulas of the various organic materials used in the above embodiments are as follows:

[0181]

[0182]

[0183] The performance of the devices prepared in Examples 1-56 and Comparative Examples 1-6 of this invention is shown in Table 2 below:

[0184] Table 2:

[0185]

[0186]

[0187] Note: In Table 2, the half-width at half-maximum (WHM) is the half-width of the electroluminescence spectrum in the device. It is the peak width at half the peak height, that is, the distance between the two points where the straight line parallel to the bottom of the peak passes through the midpoint of the peak height and intersects the two sides of the peak.

[0188] The photoelectric properties of OLED devices, such as current density and external quantum efficiency, as well as their photochromic properties, such as electroluminescence spectrum, were obtained using a combination of a Hamamatsu C9920-02G quantum efficiency meter and a Keithley 2400 semiconductor analyzer. Device lifetime (LT90@15mA / cm) 2 This represents the time taken for the device brightness to decrease to 90% of its initial brightness, where the initial brightness is a current density of 15 mA / cm². 2 The corresponding brightness was obtained by testing using the OLED aging life test system of Shanghai University.

[0189] In Table 2, LT90@15mA / cm 2 The relative value of / h is the result obtained by comparing with Comparative Example 1.

[0190] In the compounds of this invention, at least one of rings C and D is any of the structures in formulas (1-1), (1-2), and (1-3). In the structures of formulas (1-1), (1-2), and (1-3), the benzene rings connected by the carbazole N atom are linked by a spirolock structure, connecting the two benzene rings and eliminating the original repulsion between hydrogen atoms. This prevents the benzene rings connected by the carbazole N atom from rotating freely, significantly enhancing molecular rigidity, further reducing the full width at half maximum (FWHM) (≤25nm), and improving color purity. Consequently, the efficiency and lifetime of the light-emitting device are significantly improved. Furthermore, the core structure of the compounds of this invention is based on the traditional BN core structure, with rings A and E, and / or rings D and E locked by a carbazole spirolock structure. This suppresses the stability reduction caused by the original repulsion between hydrogen atoms between the two rings. This spirolock structure also increases intermolecular interactions, mitigating the reduction in efficiency, color, and lifetime caused by molecular stacking, thereby enabling the development and preparation of efficient, stable, and color-pure OLED device light-emitting materials.

[0191] Compared to Comparative Examples 1-6, Examples 1-56, with other materials remaining the same in the organic electroluminescent device structure, exhibit higher efficiency, narrower half-width at half-maximum (WHM), and longer lifetime. The electroluminescence spectra of OLED devices prepared using the compounds of this invention have narrow WHMs (≤25 nm), thus greatly enriching the framework system of multiple resonance narrow-spectrum materials. The corresponding electroluminescent devices possess high luminous efficiency and extremely long lifetime, meeting the current requirements of panel manufacturers for high-performance materials and demonstrating promising application prospects in industrialization.

[0192] The experimental data above show that the novel MR-TADF material provided by this invention, when used in organic electroluminescent devices, achieves excellent performance in terms of high color purity and high luminous efficiency, while also exhibiting an extremely long device lifetime. Therefore, this type of novel compound is a high-performance organic light-emitting functional material with promising prospects for commercial application.

[0193] Although the invention has been described with reference to embodiments, it is not limited to the above embodiments. It should be understood that various modifications and improvements can be made by those skilled in the art under the guidance of the inventive concept, and the appended claims summarize the scope of the invention. Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An organic compound selected from the structure shown in formula (1) or formula (2): In equations (1) and (2), rings A, B, C, D, E, F, G, H, I, J, and K are each independently represented as one of an aromatic ring of C6 to C60 or a heteroaromatic ring of C5 to C60, and at least one of rings C and D is any of the structures described in equation (1-1), (1-2), or (1-3); In equations (1-1), (1-2), and (1-3), "*" indicates the connection point with equation (1) or (2); In equations (1) and (2), R a R b R c R d R e R f R g R h R i R j R k Each substituent can be independently represented from a single substituent to the maximum permissible number of substituents; The R a R b R c R d R e R f R g R h R i R j R k Each is independently connected to the ring structure it is linked to via a single bond or fusion bond; The R a R b R c R d R e R f R g R h R i R j R k Two adjacent elements in the middle are either not connected or connected in a loop; R a R b R c R d R e R f R g R h R i R j R k Each group is independently selected from one of the following groups: hydrogen, deuterium, halogen, carbonyl, carboxyl, nitro, cyano, amino, or unsubstituted or R'-substituted: C1-C36 chain alkyl, C3-C36 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkoxy, C1-C10 alkylsilyl, C1-C10 alkylamino, C6-C30 arylamino, C3-C30 heteroarylamino, C6-C60 aryl, C6-C60 aryloxy, or C5-C60 heteroaryl; The two adjacent R's mentioned above are either not connected or connected to form a ring; each R' is independently selected from one or a combination of two of the following: deuterium, halogen, cyano, amino, C2-C10 alkenyl, C1-C10 chain alkyl, C3-C10 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkoxy, C1-C10 alkylsilyl, C1-C10 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C6-C60 aryl, and C3-C60 heteroaryl.

2. The organic compound according to claim 1, characterized in that, The rings C and D are each independently the structure shown in equation (a), equation (b) or equation (c), or any of the structures in equation (1-1), equation (1-2) or equation (1-3), and at least one of the rings C and D is any of the structures in equation (1-1), equation (1-2) or equation (1-3); The rings A and B are each independently the structure shown in equation (a), equation (b), or equation (c); Ring E has the structure shown in equation (a); Rings F, G, H, I, J, and K are each independently represented by the structure shown in equation (a) or equation (b); In formulas (a), (b) and (c), the double bonds in the dashed lines represent the fusion positions of the group in formula (1) or (2); In equations (a), (b), and (c), Z 1 Z 2 Z 3 Z 4 Z 5 Z 6 Z 7 Z 8 Z 9 Z 10 Z 11 Z 12 Each is independently selected from C, CH, or N; In equation (c), Z is selected from O, S, and NR. 1 or CR 2 R 3 ; R 1 R 2 R 3 It is either not connected to adjacent groups or forms a ring through chemical bonds; R 2 With R 3 They are either not connected or connected in a loop; R 1 R 2 R 3 Each is independently selected from one of the following: unsubstituted or R”-substituted C1-C20 chain alkyl, unsubstituted or R”-substituted C3-C20 cycloalkyl, unsubstituted or R”-substituted C6-C60 aryl, and unsubstituted or R”-substituted C3-C60 heteroaryl; "R" is selected from any one of deuterium, halogen, cyano, amino, C2-C20 alkenyl, C1-C20 chain alkyl, C3-C20 cycloalkyl, C1-C20 alkoxy, C1-C20 thioalkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C6-C60 arylamino, C3-C60 heteroarylamino, C6-C30 aryloxy, C6-C60 aryl, and C3-C60 heteroaryl.

3. The organic compound according to claim 2, characterized in that, In equation (c), Z is selected from O, S, or NR. 1 ;R 1 It is either not connected to adjacent groups or is linked to form a ring through chemical bonds; R 1 Selected from one of the following groups, either unsubstituted or R”-substituted: phenyl, naphthyl, anthracene, benzo[a]anthrayl, phenanthrene, benzo[a]phenanthrene, pyrene, fluoranyl, tetraphenyl, pentaphenyl, benzo[a]pyrene, biphenyl, amphylphenyl, terphenyl, trimerphenyl, tetraphenyl, fluorenyl, spirodifluorenyl, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis or trans indo[a]fluorenyl, trimerinyl, isotrimerininyl, spirotrimerininyl, spiroisotrimerininyl, furanyl, benzofuranyl, isobenzofuranyl, dibenzofuranyl, Thiopheneyl, benzothiopheneyl, isobenzothiopheneyl, dibenzothiopheneyl, pyrroleyl, isoindolyl, carbazoleyl, indocarbazoleyl, pyridyl, quinolinyl, isoquinolinyl, acridineyl, phenanthridineyl, benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indazoleyl, imidazolyl, benzimidazoleyl, naphthiazoleyl, phenanthrimidazoleyl, pyridiniumimidazoleyl, pyraziniumimidazoleyl, quinoxalolineimidazolyl, oxazolyl, benzooxazolyl, naphthiazoleyl, anthraquinoxazol 1,2-thiazolyl, 1,3-thiazolyl, benzothiazolyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, quinoxalinyl, 1,5-diazathanel, 2,7-diazapyrene, 2,3-diazapyrene, 1,6-diazapyrene, 1,8-diazapyrene, 4,5-diazapyrene, 4,5,9,10-tetraazaperyl, pyrazinyl, phenazinyl, phenthiazinyl, naphridinyl, azacarbazolyl, benzocarbaolinyl, phenanthrolinel, 1,2, 3-Triazolyl, 1,2,4-Triazolyl, Benzotriazolyl, 1,2,3-Oxadiazolyl, 1,2,4-Oxadiazolyl, 1,2,5-Oxadiazolyl, 1,2,3-Thiadiazolyl, 1,2,4-Thiadiazolyl, 1,2,5-Thiadiazolyl, 1,3,4-Thiadiazolyl, 1,3,5-Triazinyl, 1,2,4-Triazinyl, 1,2,3-Triazinyl, Tetrazolyl, 1,2,4,5-Tetraazinyl, 1,2,3,4-Tetraazinyl, 1,2,3,5-Tetraazinyl; "R" is selected from one of the following: deuterium, cyano, C1-C6 chain alkyl, C3-C6 cycloalkyl, C1-C6 alkoxy, C6-C30 aryloxy, C6-C30 aryl, and C3-C30 heteroaryl.

4. The organic compound according to claim 1, characterized in that, The rings A, B, F, G, H, I, J, and K each independently represent one of the aromatic rings of C6 to C30 and the heteroaromatic rings of C5 to C30, and ring E represents an aromatic ring of C6 to C30. Preferably, ring A and ring B are each independently selected from phenyl, naphthyl, anthracene, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazole, indolocarbazole, benzothiophene, dibenzothiophene, thiophene, benzoanthrayl, phenanthrayl, pyrene, pyrene, peryl, fluoranyl, tetraphenyl, pentaphenyl, benzopyrene, biphenyl, amphyl, terphenyl, triphenyl, triphenyl, tetraphenyl, diphenyl, furanyl, benzofuranyl, isobenzofuranyl, dibenzofuranyl, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene, pyrrole The following are all groups of compounds: 1,2-thiazolyl, isoindolyl, carbazolyl, indocarbazolyl, pyridyl, quinolinyl, isoquinolinyl, acridineyl, phenanthridineyl, benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indazoleyl, imidazolyl, benzimidazoleyl, naphthimidazoleyl, phenanthridinemidazoleyl, pyridiniumimidazoleyl, pyraziniumimidazoleyl, quinoxaliniumimidazoleyl, oxazolyl, benzooxazolyl, naphthimidazoleyl, anthraquinoxazolyl, phenanthridinemidazoleyl, 1,2-thiazolyl, 1,3-thiazolyl, benzothiazolyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalylyl. The ring E is selected from phenyl; The rings F, G, H, I, J, and K are each independently one of phenyl, naphthyl, anthraceneyl, phenanthreneyl, benzo[a]phenanthreneyl, pyreneyl, pyrrolyl, peryl, fluoranthyl, tetraphenyl, pentaphenyl, benzo[a]pyreneyl, biphenyl, amphylphenyl, terphenyl, triphenyl, tetraphenyl, diphenyl, pyridyl, quinolinyl, isoquinolinyl, pyridazinyl, benzo[a]pyridazinyl, pyrimidinyl, benzo[a]pyrimidinyl, and quinoxalinyl. More preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, phenanthryl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl. More preferably, ring E is selected from phenyl; more preferably, ring F, ring G, ring H, ring I, ring J, and ring K are each independently any one of phenyl, naphthyl, anthraceneyl, phenanthryl, pyridyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl. More preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiopheneyl, dibenzothiopheneyl, and thiopheneyl; ring E is selected from phenyl; ring F, ring G, ring H, ring I, ring J, and ring K are each independently selected from any one of phenyl, naphthyl, anthraceneyl, phenanthryl, pyridinyl, pyridazinyl, and pyrimidinyl. Most preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiophenyl, dibenzothiophenyl, and thiophenyl; and ring E, ring F, ring G, ring H, ring I, ring J, and ring K are all phenyl.

5. The organic compound according to claim 1 or 2, characterized in that, The rings C and D are each independently represented as one of the aromatic rings of C6 to C30 and the heteroaromatic rings of C5 to C30, or the rings C and D are each independently represented as any structure of formula (1-1), formula (1-2), and formula (1-3), and at least one of the rings C and D is any structure of formula (1-1), formula (1-2), and formula (1-3); Preferably, one of ring C and ring D is any structure of formula (1-1), formula (1-2), or formula (1-3), and the other is the structure shown in formula (a), formula (b), or formula (c); More preferably, only one of ring C and ring D is any one of the structures of formula (1-1), formula (1-2), and formula (1-3), and the other is selected from phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, benzoanthrayl, phenanthyl, pyrene, pyrene, peryl, fluoranyl, tetraphenyl, pentaphenyl, benzopyreneyl, biphenyl, amphyl, terphenyl, triphenyl, triphenyl, tetraphenyl, diphenyl, furanyl, benzofuranyl, isobenzofuranyl, dibenzofuranyl, thiopheneyl, benzothiopheneyl, etc. The following is a list of compounds: isobenzothiophene, dibenzothiophene, pyrrole, isoindolyl, carbazolyl, indoxcarbazolyl, pyridyl, quinolinyl, isoquinolinyl, acridinel, phenanthridinel, benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indoxolyl, imidazolyl, benzimidazolyl, naphthimidazolyl, phenanthridinemidazolyl, pyridiniumimidazolyl, pyraziniumimidazolyl, quinoxoliniumimidazolyl, oxazolyl, benzooxazolyl, naphthimidazolyl, anthraquinoxazolyl, phenanthridinemidazolyl, 1,2-thiazolyl, 1,3-thiazolyl, benzothiazolyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxolinyl. More preferably, only one of ring C and ring D is any one of the structures of formula (1-1), formula (1-2), and formula (1-3), and the other is one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, phenanthrylyl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl. Most preferably, only one of ring C and ring D is any one of the structures of formula (1-1), formula (1-2) and formula (1-3), and the other is one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiophenyl, dibenzothiophenyl, and thiophenyl.

6. The organic compound according to claim 1, characterized in that, It has the structure shown in equation (2-1) or equation (2-2): Among them, R a R b R c R d R e R f R g R h R i R j R k The definitions are the same as those in equations (1) and (2); Ring C and ring D are each independently the structure shown in equation (a), equation (b) or equation (c), or any of the structures in equation (1-1), equation (1-2) or equation (1-3), and at least one of ring C and ring D is any of the structures in equation (1-1), equation (1-2) or equation (1-3); Ring A and ring B are each independently the structures shown in equation (a), equation (b), or equation (c); In equations (a), (b), and (c), Z 1 -Z 12 The definition of Z is the same as that in claim 2; Preferably, one of ring C and ring D is any structure of formula (1-1), formula (1-2), or formula (1-3), and the other is the structure shown in formula (a), formula (b), or formula (c); More preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoleyl, indolocarbazoleyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, phenanthryl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl. More preferably, only one of ring C and ring D is any one of the structures of formula (1-1), formula (1-2), and formula (1-3), and the other is one of phenyl, naphthyl, anthraceneyl, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiopheneyl, dibenzothiopheneyl, thiopheneyl, phenanthrylyl, pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, and quinoxalinyl. Most preferably, ring A and ring B are each independently selected from one of phenyl, naphthyl, anthracene, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiophenyl, dibenzothiophenyl, and thiophenyl; only one of ring C and ring D is any structure of formula (1-1), formula (1-2), and formula (1-3), and the other is one of phenyl, naphthyl, anthracene, fluorenyl, furanyl, benzofuranyl, dibenzofuranyl, indolyl, benzoindolyl, carbazoyl, indolocarbazoyl, benzothiophenyl, dibenzothiophenyl, and thiophenyl.

7. The organic compound according to any one of claims 1-6, characterized in that, The R a R b R c R d R e R f R g R h R i R j R k Each group is independently selected from hydrogen, deuterium, halogen, cyano, or unsubstituted or R'-substituted groups of the following: C1-C10 chain alkyl, C3-C10 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkoxy, C6-C20 arylamino, C3-C20 heteroarylamino, C6-C30 aryl, C6-C30 aryloxy, and C5-C30 heteroaryl. R' is selected from one of the following: deuterium, halogen, cyano, amino, C1-C10 chain alkyl, C3-C10 cycloalkyl, C1-C10 alkoxy, C1-C10 thioalkoxy, C1-C10 alkylsilyl, C1-C10 alkylamino, C6-C30 arylamino, C3-C30 heteroarylamino, C6-C30 aryloxy, C6-C30 aryl, and C3-C30 heteroaryl. Preferably, the R a R b R c R d R e R f R g R h R i R j R k Each of the following substituents is independently selected from hydrogen, deuterium, cyano, halogen, or a combination of one or two of the following: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 2-methylbutyl, n-pentyl, sec-pentyl, cyclopentyl, neopentyl, n-hexyl, cyclohexyl, neohexyl, n-heptyl, cycloheptyl, n-octyl, cyclooctyl, 2-ethylhexyl, trifluoromethyl, pentafluoroethyl, 2,2,2-trifluoroethyl, phenyl, naphthyl, anthracene, benzo[a]anthrayl, phenanthrene, benzo[a]phenanthrene, pyrene, pyryl, peryl, fluoranyl, tetraphenyl, pentaphenyl, benzo[a]pyrene, biphenyl, amphyl, terphenyl, triphenyl, tetraphenyl, Fluorenyl, spirodifluorenyl, dihydrophenanthrene, dihydropyrene, tetrahydropyrene, cis or trans indofluorenyl, trimerinyl, isotrimericininyl, spirotrimericininyl, spiroisotrimericininyl, furanyl, benzofuranyl, isobenzofuranyl, dibenzofuranyl, thiopheneyl, benzothiopheneyl, isobenzothiopheneyl, dibenzothiopheneyl, pyrroleyl, isoindoleyl, carbazoleyl, indocarbazoleyl, pyridinyl, quinolinyl, isoquinolinyl, acridineyl, phenanthridineyl, benzo-5,6-quinolinyl, benzo-6,7-quinolinyl, benzo-7,8-quinolinyl, pyrazolyl, indazoleyl, imidazoyl, benzimidazoleyl, naphthizimidazoleyl, phenanthrenezimidazoleyl, pyridinium imidazoyl, pyrazine Imidazolyl, quinoxaloylimidazolyl, oxazolyl, benzoxoxazolyl, naphthoxazolyl, anthraxoxazolyl, phenanthoxazolyl, 1,2-thiazolyl, 1,3-thiazolyl, benzothiazolyl, pyridazinyl, benzopyridazinyl, pyrimidinyl, benzopyrimidinyl, quinoxaloyl, 1,5-diazaanthrayl, 2,7-diazapyrene, 2,3-diazapyrene, 1,6-diazapyrene, 1,8-diazapyrene, 4,5-diazapyrene, 4,5,9,10-tetraazaperyl, pyrazinyl, phenazinyl, phenothiazinyl, naphridinyl, azacarbazolyl, benzocarbazolyl, phenanthrolinel, 1,2,3-triazolyl, 1,2,4-triazolyl Benzotriazolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,2,3-thiadiazolyl, 1,2,4-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,4-thiadiazolyl, 1,3,5-triazinyl, 1,2,4-triazinyl, 1,2,3-triazinyl, tetrazolyl, 1,2,4,5-tetraazinyl, 1,2,3,4-tetraazinyl, 1,2,3,5-tetraazinyl, purinyl, pteridyl, indazyl, benzothiadiazolyl, 9,9-dimethylacridyl, triarylamine, adamantane, fluorophenyl, methylphenyl, trimethylphenyl, cyanophenyl or methoxy; More preferably, the R a R b R c R d R e R f R g R h R i R j R k Each of the following groups is independently selected from hydrogen, deuterium, cyano, halogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, 2-methylbutyl, trifluoromethyl, pentafluoroethyl, phenyl, naphthyl, anthracene, benzo[a]anthrayl, phenanthrene, benzo[a]phenanthrene, pyrene, fluoranyl, tetraphenyl, pentaphenyl, benzo[a]pyrene, biphenyl, amphyl, terphenyl, triphenyl, tetraphenyl, fluorenyl, spirodifluorenyl, furanyl, benzo[a]furanyl, isobenzo[a]furanyl, dibenzo[a]furanyl, thienyl, benzo[a]thienyl, isobenzo[a]thienyl, dibenzo[a]thienyl, pyrroleyl, isoindoleyl, carbazoleyl, indoxocarbazoleyl, pyridyl, quinolinyl, isoquinolinyl, pyrazolyl, indazoleyl, imidazolyl. Pyridazinyl, pyrimidinyl, benzopyrimidinyl, quinoxalinyl, pyrazinyl, phenazinyl, phenothiazinyl, naphridinyl, azacarbazolyl, benzocarbazolyl, phenanthrolinel, 1,2,3-triazolyl, 1,2,4-triazolyl, benzotriazolyl, 1,2,3-oxadiazolyl, 1,2,3-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,4-thiadiazolyl, 1,3,5-triazinyl, 1,2,4-triazinyl, 1,2,3-triazinyl, tetrazolyl, 1,2,4,5-tetraazinyl, inazinyl, benzothiadiazolyl, 9,9-dimethylacridinyl, triarylamine, adamantane, fluorophenyl, methylphenyl, trimethylphenyl, cyanophenyl, or methoxy.

8. The organic compound according to claim 1, wherein the compound is selected from the following specific structural compounds:

9. The application of the organic compound according to any one of claims 1-8 as a functional material in organic electronic devices, wherein the organic electronic devices are organic electroluminescent devices, optical sensors, solar cells, organic thin-film transistors, or organic field-effect transistors; The organic compound is used as a light-emitting layer material in organic electroluminescent devices, specifically as a light-emitting material in the light-emitting layer.

10. An organic electroluminescent device, comprising a substrate, and an anode layer, a plurality of light-emitting functional layers, and a cathode layer sequentially formed on the substrate; wherein the light-emitting functional layers include a hole injection layer, a hole transport layer, a light-emitting layer, and an electron transport layer, wherein the hole injection layer is formed on the anode layer, the hole transport layer is formed on the hole injection layer, the cathode layer is formed on the electron transport layer, and a light-emitting layer is located between the hole transport layer and the electron transport layer, wherein the light-emitting layer contains an organic compound as described in any one of claims 1-8.

11. A display device comprising the organic electroluminescent device of claim 10.

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