Organic laminated electroluminescent device and display device comprising same

Abstract

The invention provides an organic laminated electroluminescent device and a display device comprising the same. The organic laminated electroluminescent device comprises an anode, a cathode, a first light-emitting unit and a second light-emitting unit, wherein the first light-emitting unit and the second light-emitting unit are arranged between the anode and the cathode; the first light-emitting unit and the second light-emitting unit each independently comprise a light-emitting layer; the main body material of the light-emitting layer independently comprises a combination of a first main body material and a second main body material; the first main body material is a P-type main body material, and the second main body material is an N-type main body material and / or a bipolar main body material; the mass of the first host material in the first light-emitting unit is smaller than that of the second host material; the mass of the first host material in the second light emitting unit is greater than the mass of the second host material. By regulating and controlling the proportion of the two main body materials in the light-emitting unit, the light-emitting efficiency and the light-emitting brightness of the organic laminated electroluminescent device are effectively improved, the voltage is reduced, and the service life of the device is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of organic electroluminescent display, and in particular relates to an organic stacked electroluminescent device and a display device comprising the same. Background Art

[0002] Organic light-emitting devices (OLED) devices include a cathode, a cathode and an organic thin film structure located between two electrodes. The organic thin film structure contains a variety of organic functional materials and is the core of OLED devices. Common organic functional materials include: hole injection materials, hole transport materials, hole blocking materials, electron injection materials, electron transport materials, electron blocking materials, luminescent host materials and luminescent guest materials (dyes), etc. When power is turned on, the electrons and holes from the two electrodes are injected and transported to the luminescent area respectively and recombine there, thereby generating excitons and emitting light.

[0003] With the development of display technology and people's demand for the improvement of display technology, people have put forward higher requirements for the brightness, life and other performance of display panels and OLED devices. In order to improve the performance of OLED devices, organic stacked electroluminescent devices containing more than two light-emitting units have come into being. Compared with single-layer devices containing one light-emitting unit, stacked devices have obvious performance advantages in terms of luminous brightness and life. However, in organic stacked electroluminescent devices, the voltage drop caused by the charge generation layer between each light-emitting unit leads to problems such as voltage increase, increased power consumption, reduced efficiency and life of the device.

[0004] Therefore, there is an urgent need to develop organic stacked electroluminescent devices with higher performance in this field. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide an organic stacked electroluminescent device and a display device comprising the same, and through the design of the main material of the light-emitting layer in each light-emitting unit, the organic stacked electroluminescent device has lower voltage, higher efficiency and longer life.

[0006] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an organic stacked electroluminescent device, comprising an anode, a cathode, and a first light-emitting unit and a second light-emitting unit arranged between the anode and the cathode; the distance between the first light-emitting unit and the anode is less than the distance between the first light-emitting unit and the cathode, and the distance between the second light-emitting unit and the anode is greater than the distance between the second light-emitting unit and the cathode; the first light-emitting unit and the second light-emitting unit each independently include a light-emitting layer; the main material of the light-emitting layer each independently includes a combination of a first main material and a second main material; the first main material is a P-type main material, and the second main material is an N-type main material and / or a bipolar main material; the mass of the first main material in the first light-emitting unit is less than the mass of the second main material in the first light-emitting unit; the mass of the first main material in the second light-emitting unit is greater than the mass of the second main material in the second light-emitting unit.

[0008] In the organic stacked electroluminescent device provided by the present invention, at least one light-emitting unit close to the anode is named "first light-emitting unit", and at least one light-emitting unit close to the cathode is named "second light-emitting unit". The light-emitting layers of the first light-emitting unit and the second light-emitting unit are both designed with dual host materials, specifically a combination of a first host material and a second host material; the first host material is a P-type host material (hole-type host material) with good hole transport capability; the second host material is an N-type host material (electron-type host material) and / or a bipolar host material with excellent electron transport properties and / or carrier balance transport properties; the dual host materials are compounded with each other to achieve a good balanced transport effect of holes and electrons. The present invention more effectively balances and improves the transport capacity of holes and electrons in each light-emitting unit by regulating the mass ratio of the first host material to the second host material in different light-emitting units, achieves carrier transport balance, increases the probability of electrons and holes recombining and generating excitons, thereby improving the luminous efficiency and luminous brightness of the organic stacked electroluminescent device, while reducing the voltage and improving the life of the device and display device.

[0009] In the present invention, the term "P-type host material" means "hole-type host material" and has good hole transport capability. The term "N-type host material" means "electron-type host material" and has good electron transport capability. The term "bipolar host material" can transport both electrons and holes and has good carrier balance transport capability.

[0010] In the present invention, "the distance between the first light-emitting unit and the anode" means the distance between the light-emitting layer of the first light-emitting unit and the anode; "the distance between the first light-emitting unit and the cathode" means the distance between the light-emitting layer of the first light-emitting unit and the cathode. The distance between the second light-emitting unit and the anode / cathode has the same meaning, and for the sake of simplicity, it will not be repeated one by one.

[0011] It should be noted that, in the present invention, the number of light-emitting units disposed between the anode and the cathode is ≥2, and the specific number is not particularly limited, and can be 2, 3, 4, 5, 6, 7, 8, 9, 10, etc. When the number of light-emitting units is ≥3, the present invention does not specifically limit the specific positions of the first light-emitting unit and the second light-emitting unit, and only needs to satisfy "the distance between the first light-emitting unit and the anode is less than the distance between the first light-emitting unit and the cathode" and "the distance between the second light-emitting unit and the anode is greater than the distance between the second light-emitting unit and the cathode".

[0012] Preferably, the mass ratio of the first host material to the second host material in the first light-emitting unit is 1:(1.01-9), for example, it can be 1:1.05, 1:1.1, 1:1.5, 1:1.8, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, etc., preferably 1:(1.01-5), and further preferably 1:(1.01-1.5).

[0013] Preferably, the mass ratio of the first host material to the second host material in the second light-emitting unit is (1.01-9):1, for example, it can be 1.05:1, 1.1:1, 1.5:1, 1.8:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, etc., preferably (1.01-5):1, and further preferably (1.01-1.5):1.

[0014] Preferably, each light-emitting unit disposed between the anode and the cathode comprises a light-emitting layer; and the host material of the light-emitting layer of each light-emitting unit independently comprises a combination of a first host material and a second host material.

[0015] It should be noted that the first host material in each light-emitting unit can be all the same, all different, or partially the same material; for "partially the same", an example can be: if there are three light-emitting units in total, then the first host material of two light-emitting units is the same, and different from the first host material of the third light-emitting unit. The second host material in each light-emitting unit can also be all the same, all different, or partially the same material.

[0016] Preferably, the first host material in the first light-emitting unit and the first host material in the second light-emitting unit are the same material; and / or the second host material in the first light-emitting unit and the second host material in the second light-emitting unit are the same material.

[0017] Preferably, at least three light-emitting units are provided between the anode and the cathode; taking the direction from the anode to the cathode as the first direction, the mass content of the first main material in each light-emitting unit increases along the first direction.

[0018] As a preferred technical solution of the present invention, along the first direction, the mass content of the first host material in the light-emitting layer of each light-emitting unit increases, that is, the mass content of the first host material increases in the light-emitting unit closer to the cathode. The "mass content of the first host material" is relative to the host material of the light-emitting layer (that is, the sum of the first host material and the second host material).

[0019] Preferably, the increasing manner is uniform increasing.

[0020] The direction from the anode to the cathode is taken as the first direction, and the light-emitting units are arranged in sequence according to the first direction. The mass ratio of the first main material to the second main material in the first light-emitting unit is 1:x, where x is 1.01-9; examples of the uniform increase are: (1) the total number of light-emitting units between the anode and the cathode is 3, then the mass ratios of the first main material to the second main material in the first, second, and third light-emitting units are 1:x, 1:1, and x:1 respectively; (2) the total number of light-emitting units between the anode and the cathode is 4, then the mass ratios of the first main material to the second main material in the first, second, third, and fourth light-emitting units are 1:x, 1:(x / 2), (x / 2):1, and x:1 respectively; (3) the mass ratios of the first main material to the second main material in the anode and the cathode are 1:x, 1:(x / 2), (x / 2):1, and x:1 respectively; The total number of light-emitting units between the anode and the cathode is 5. The light-emitting units are arranged in sequence according to the first direction. The mass ratios of the first host material to the second host material in the first, second, third, fourth, and fifth light-emitting units are 1:x, 1:(x / 2), 1:1, (x / 2):1, and x:1, respectively; (4) The total number of light-emitting units between the anode and the cathode is 6. The light-emitting units are arranged in sequence according to the first direction. The mass ratios of the first host material to the second host material in the first, second, third, fourth, fifth, and sixth light-emitting units are 1:x, 1:(2x / 3), 1:(x / 3), (x / 3):1, (2x / 3):1, and x:1, respectively; and so on. For the sake of brevity, they are not described one by one.

[0021] Preferably, a third light emitting unit is further provided between the anode and the cathode, and the distance between the third light emitting unit and the anode is equal to the distance between the third light emitting unit and the cathode.

[0022] Preferably, the third light-emitting unit comprises a light-emitting layer; and the mass ratio of the first host material to the second host material in the light-emitting layer of the third light-emitting unit is 1:1.

[0023] Preferably, the first host material in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is the same material; and / or the second host material in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is the same material.

[0024] Preferably, the total number of light-emitting units between the anode and the cathode is 2n, and the direction from the anode to the cathode is taken as the first direction. The light-emitting units are sequentially arranged according to the first direction, and the mass ratio of the first host material to the second host material in the first light-emitting unit to the nth light-emitting unit is independently 1:(1.01-9), for example, it can be 1:1.05, 1:1.1, 1:1.5, 1:1.8, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, etc., and is further preferably 1:(1.01-5), and further Preferably 1:(1.01-1.5); the mass ratio of the first host material to the second host material in the n+1th light-emitting unit to the 2nth light-emitting unit is independently (1.01-9):1, for example, it can be 1.05:1, 1.1:1, 1.5:1, 1.8:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, etc., further preferably (1.01-5):1, and further preferably (1.01-1.5):1; wherein n is an integer ≥1, for example, it can be 1, 2, 3, 4, 5, 6, etc.

[0025] It should be noted that the total number of light-emitting units between the anode and the cathode is 2n, then the first light-emitting unit is at least one of the first light-emitting unit to the nth light-emitting unit; the second light-emitting unit is at least one of the n+1th light-emitting unit to the 2nth light-emitting unit.

[0026] Preferably, the mass content of the first host material in each light-emitting unit increases along the first direction, and more preferably increases uniformly.

[0027] Preferably, the total number of light-emitting units between the anode and the cathode is 2n+1, and the direction from the anode to the cathode is taken as the first direction. The light-emitting units are arranged in sequence according to the first direction, and the mass ratio of the first host material to the second host material in the first light-emitting unit to the nth light-emitting unit is independently 1:(1.01-9), for example, it can be 1:1.05, 1:1.1, 1:1.5, 1:1.8, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, etc., further preferably 1:(1.01-5), and further preferably 1:(1.01-1.5); the first The mass ratio of the first host material to the second host material in the n+1 light-emitting units is 1:1; the mass ratio of the first host material to the second host material in the n+2th to 2n+1th light-emitting units is each independently (1.01-9):1, for example, it can be 1.05:1, 1.1:1, 1.5:1, 1.8:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, etc., further preferably (1.01-5):1, and further preferably (1.01-1.5):1; wherein n is an integer ≥1, for example, it can be 1, 2, 3, 4, 5, 6, etc.

[0028] It should be noted that the total number of light-emitting units between the anode and the cathode is 2n+1, then the first light-emitting unit is at least one of the first light-emitting unit to the nth light-emitting unit; the second light-emitting unit is at least one of the n+2th light-emitting unit to the 2n+1th light-emitting unit.

[0029] Preferably, the mass content of the first host material in each light-emitting unit increases along the first direction, and more preferably increases uniformly.

[0030] Preferably, the HOMO energy level of the first host material is -5.00 eV to -5.50 eV, for example, -5.05 eV, -5.1 eV, -5.15 eV, -5.2 eV, -5.25 eV, -5.3 eV, -5.35 eV, -5.4 eV, -5.45 eV, etc.

[0031] And / or, the LUMO energy level of the second host material is -2.21eV to -2.82eV, for example, it can be -2.25eV, -2.30eV, -2.35eV, -2.4eV, -2.45eV, -2.5eV, -2.55eV, -2.6eV, -2.65eV, -2.7eV, -2.75eV, -2.8eV, etc.

[0032] The present invention does not impose any special limitation on the first host material, and any P-type host material known in the art can be used in the present invention.

[0033] Preferably, the first host material comprises any one or a combination of at least two of the compounds having a structure as shown in any one of Formula I, Formula II and Formula III:

[0034]

[0035] In Formula I, L 11 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted C3-C30 heteroarylene group; when the L 11 When it is a single bond, it represents Ar 11 It is directly connected to the N atom via a single bond.

[0036] In Formula I, Ar 11 Any one selected from a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C3-C30 heteroaryl group.

[0037] In Formula I, R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , R 18 Each is independently selected from any one of hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C6-C30 aryl, wherein

[0038] The R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , R 18 Any two adjacent groups in which one group is connected by a chemical bond to form a ring A, wherein the ring A is -* represents the attachment site of the group.

[0039] In ring A, R A1 , R A2 , R A3 , R A4are each independently selected from any one of hydrogen, halogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C6-C30 aryl; the R A1 , R A2 , R A3 , R A4 Any two adjacent groups are not connected or connected to form a ring through a chemical bond.

[0040] In ring A, X 1 , Y 1 Each independently selected from a single bond, NR A5 , O, S or CR A6 R A7 Any one of the above, and the X 1 and Y 1 At most one of them is a single bond.

[0041] R A5 Any one selected from a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C3-C30 heteroaryl group.

[0042] R A6 , R A7 are each independently selected from any one of hydrogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl; the R A6 and R A7 They are not connected to each other or are connected to form a ring through chemical bonds.

[0043] In Formula I, the R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , R 18 In the above, except for the groups forming ring A, any two adjacent groups in other groups are not connected or connected by chemical bonds to form a ring.

[0044] In Formula I, L 11 ,Ar 11 , R 11 , R 12 , R 13 , R 14 , R 15 , R16 , R 17 , R 18 , R A1 , R A2 , R A3 , R A4 , R A6 , R A7 The substituents substituted in the above-mentioned substitution are each independently selected from any one of halogen, cyano, nitro, hydroxyl, amino, carboxyl, thiol, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C3-C20 cycloalkyl, C2-C20 heterocycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C30 arylamino, and C3-C30 heteroarylamino, or a combination of at least two thereof.

[0045] In the present invention, the "substituted or unsubstituted" group may be substituted with one substituent or with multiple substituents. When there are multiple substituents (at least 2), they may be the same or different substituents. When the same expressions are mentioned below, they have the same meaning.

[0046] Unless otherwise specified, the selection ranges of substituents related to Formula I are as shown above and will not be repeated here.

[0047] In the present invention, the halogen may be fluorine, chlorine, bromine or iodine. The following descriptions involving the same have the same meaning.

[0048] In the present invention, the expression of chemical elements, unless otherwise specified, includes the concept of isotopes with the same chemical properties. For example, hydrogen (H) includes 1 H (hydrogen), 2 H (deuterium, D), 3 H (tritium, T), etc.; carbon (C) includes 12 C. 13 C, etc.

[0049] In the present invention, unless otherwise specified, the heteroatom of the heteroaryl group is selected from N, O, S, P, B, Si or Se, preferably N, O or S.

[0050] In the present invention, the expression of a ring structure crossed by “—” indicates that the connection site is at any position on the ring structure that can form a bond.

[0051] In the present invention, "-*" and "*" both represent the bonding site of a group.

[0052] In the present invention, the expression of Ca-Cb means that the number of carbon atoms in the group is ab. Unless otherwise specified, the number of carbon atoms does not include the number of carbon atoms in the substituent.

[0053] In the present invention, “each independently” means that when there are multiple subjects, they may be the same as or different from each other.

[0054] In the present invention, the C6-C30 may be C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28.

[0055] The C3-C30 can all be C3, C4, C5, C6, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26 or C28, etc.

[0056] The C1-C20 can all be C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18 or C19, etc.

[0057] The C3-C20 can all be C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18 or C19, etc.

[0058] The C6-C60 can all 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.

[0059] The 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.

[0060] The C1-C10 can all be C2, C3, C4, C5, C6, C7, C8 or C9, etc.

[0061] The C2-C20 can all be C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18 or C19, etc.

[0062] In the present invention, the C6-C30 aryl group, more preferably the C6-C20 aryl group, includes a monocyclic aryl group and a condensed aryl group; the monocyclic aryl group means that the group contains at least one phenyl group, and when it contains at least two phenyl groups, the phenyl groups are connected by a single bond, and exemplary examples include but are not limited to: phenyl, biphenyl, terphenyl, etc.; the condensed aryl group means that the group contains at least two aromatic rings, and the aromatic rings share two adjacent carbon atoms. The fused groups include, but are not limited to, naphthyl, anthracenyl, phenanthryl, indenyl, fluorenyl and its derivatives (9,9-dimethylfluorenyl, 9,9-diethylfluorenyl, 9,9-dipropylfluorenyl, 9,9-dibutylfluorenyl, 9,9-dipentylfluorenyl, 9,9-dihexylfluorenyl, 9,9-diphenylfluorenyl, 9,9-dinaphthylfluorenyl, spirobifluorenyl, benzofluorenyl, etc.), fluoranthenyl, triphenylene, pyrenyl, perylene, The aforementioned groups include all possible connection modes thereof; monocyclic aromatic groups and condensed aromatic groups connected by single bonds also belong to the definition of aromatic groups.

[0063] The C3-C60 heteroaryl, preferably C3-C30 heteroaryl, further preferably C3-C20 heteroaryl, includes a monocyclic heteroaryl or a condensed ring heteroaryl. The monocyclic heteroaryl means that the molecule contains at least one heteroaryl. When the molecule contains a heteroaryl and other groups (such as aryl, heteroaryl, etc.), the heteroaryl and other groups are connected by a single bond, exemplarily including but not limited to: pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, triazinyl, furanyl, thienyl, pyrrolyl, triazolyl, etc. The fused ring heteroaryl group means a group containing at least one aromatic heterocycle and one aromatic ring (aromatic heterocycle or aromatic ring) in the molecule, and the two share two adjacent atoms fused to each other, including but not limited to: quinolyl, isoquinolyl, quinoxalinyl, quinazolinyl, benzimidazolyl, benzofuranyl, benzothiophenyl, isobenzofuranyl, isobenzothiophenyl, indolyl, dibenzofuranyl, dibenzothiophenyl, carbazolyl and its derivatives (N-phenylcarbazolyl, N-naphthylcarbazolyl, benzocarbazolyl, dibenzocarbazolyl, indolcarbazolyl, azacarbazolyl, etc.), acridinyl, phenothiazinyl, phenoxazinyl, hydrogenated acridinyl, benzofurancarbazolyl, benzothiophenylcarbazolyl, azadibenzothiophenyl, azadibenzofuranyl, etc. The aforementioned groups include all feasible connection modes thereof.

[0064] Specific examples of the C6-C30 arylene group include divalent groups obtained by removing a hydrogen atom from the above-mentioned aryl groups; specific examples of the C3-C30 heteroarylene group include divalent groups obtained by removing a hydrogen atom from the above-mentioned heteroaryl groups.

[0065] In the present invention, the C6-C30 aryloxy group is a monovalent group formed by connecting the above-mentioned aryl groups and O, and the C3-C30 heteroaryloxy group is a monovalent group formed by connecting the above-mentioned heteroaryl groups and O.

[0066] In the present invention, a specific example of the C6-C30 arylamino group is a monovalent group in which at least one hydrogen in -NH2 is replaced by the above aryl group, including but not limited to phenylamino, methylphenylamino, naphthylamino, anthracenylamino, phenanthrenylamino, biphenylamino, etc. A specific example of the C3-C30 heteroarylamino group is a monovalent group in which at least one hydrogen in -NH2 is replaced by the above heteroaryl group, including but not limited to pyridylamino, pyrimidinylamino, dibenzofuranylamino, etc.

[0067] The C1-C20 straight chain or branched alkyl group, preferably a C1-C10 straight chain or branched alkyl group, illustratively includes but is not limited to: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, 2-methylbutyl, n-pentyl, isopentyl, neopentyl, n-hexyl, neohexyl, 2-ethylhexyl, n-octyl, n-heptyl, n-nonyl, n-decyl, etc.

[0068] Specific examples of the C1-C20 alkoxy group and the C1-C10 alkoxy group include monovalent groups obtained by connecting the above-mentioned linear or branched alkyl groups to O.

[0069] A specific example of the C1-C20 alkylsilyl group is a monovalent group in which at least one hydrogen in -SiH3 is replaced by the above-mentioned straight-chain or branched alkyl group; a specific example of the C1-C20 alkylamino group is a monovalent group in which at least one hydrogen in -NH2 is replaced by the above-mentioned straight-chain or branched alkyl group.

[0070] The C3-C20 cycloalkyl, preferably C3-C10 cycloalkyl, includes monocycloalkyl or polycycloalkyl. Monocycloalkyl refers to an alkyl group containing a single cyclic structure, and polycycloalkyl refers to a structure composed of two or more cycloalkyl groups sharing one or more carbon atoms on the ring; exemplary examples include but are not limited to: cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, adamantyl, etc.

[0071] Specific examples of the C2-C20 heterocycloalkyl group include monovalent groups formed by replacing at least one carbon atom in the above cycloalkyl group with a heteroatom (such as N, O or S, etc.), including but not limited to epoxy, oxetanyl, tetrahydrofuranyl, tetrahydrothiophenyl, tetrahydropyrrolyl, tetrahydropyranyl, piperidinyl, piperazinyl, dioxane, morpholinyl and the like.

[0072] The C2-C20 alkenyl, preferably C2-C10 alkenyl, contains at least one C=C, illustratively including but not limited to: vinyl, propenyl, allyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, butadienyl, pentadienyl and the like.

[0073] Preferably, in Formula I, the L 11 Any one selected from a single bond, a substituted or unsubstituted C6-C20 (e.g., C6, C7, C8, C9, C10, C12, C14, C16, or C18, etc.) arylene group, and a substituted or unsubstituted C3-C20 (e.g., C4, C5, C6, C7, C8, C9, C10, C12, C14, C16, or C18, etc.) heteroarylene group, and a single bond,

[0074]

[0075] Any one of .

[0076] Preferably, in Formula I, Ar 11 Any one or a combination of at least two selected from the following substituted or unsubstituted groups:

[0077]

[0078]

[0079]

[0080]

[0081] Preferably, in Formula I, the R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 , R 18 Any two adjacent groups in which one group is connected by a chemical bond to form a ring A, wherein the ring A is

[0082] Preferably, in Formula I Note that the group Ar 12 , the Ar 12 Any one selected from the following substituted or unsubstituted groups:

[0083]

[0084] Wherein, -* represents the attachment site of the group.

[0085] X 1 Selected from NR A5 , O, S or CR A6 R A7 Any one of .

[0086] R A5 Any one selected from substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, etc.) aryl, substituted or unsubstituted C3-C20 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, etc.) heteroaryl, more preferably Any one of .

[0087] R A6 , R A7 Each is independently selected from any one of substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C6-C30 aryl, and further preferably any one of C1-C6 (e.g., C2, C3, C4, C5, etc.) straight or branched alkyl, phenyl, naphthyl, and biphenyl.

[0088] The R A6 and R A7 They are not connected or connected by chemical bonds to form a ring F1, and the ring F1 is preferably any one of a cyclopentyl ring, a cyclohexyl ring, and a spirobifluorene ring.

[0089] U 2 It is O or S.

[0090] Preferably, Ar 12 The substituted substituents are each independently selected from at least one of halogen, substituted or unsubstituted C6-C30 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C24, C26, C28, etc.) aryl, substituted or unsubstituted C3-C30 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C24, C26, C28, etc.) heteroaryl, and more preferably at least one of phenyl, biphenyl, terphenyl, naphthyl, phenylnaphthyl, naphthylphenyl, dimethylfluorenyl, diphenylfluorenyl, spirobifluorenyl, carbazolyl, N-phenylcarbazolyl, dibenzofuranyl, or dibenzothiophenyl.

[0091] It should be noted that “Ar 12 The "substituted substituent" may be monosubstituted or polysubstituted and may be connected to any feasible connection site in the aforementioned group.

[0092] Cy-L 21 -Ar 21 Formula II.

[0093] In Formula II, L 21 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted C3-C30 heteroarylene group; when the L 21 When it is a single bond, it represents Ar 21 Directly connected to Cy via a single bond.

[0094] In Formula II, Cy is substituted or unsubstituted Substituted or unsubstituted Any one of; -* represents the connection site of the group, X2 is selected from O, S, NR 21 or CR 22 R 23 Any one of .

[0095] R 21 , R 22 , R 23 are each independently selected from any one of hydrogen, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C2-C20 alkenyl, and substituted or unsubstituted C3-C30 heteroaryl; the R 22 and R 23 Not connected or connected to form a ring through chemical bonds.

[0096] In Formula II, Ar 21 Substituted or unsubstituted -* represents the attachment site of the group. The dotted line represents that ring C1 and ring C2 are optional structures, that is, ring C1 may exist or not, and ring C2 may exist or not.

[0097] Ring C1 and ring C2 are each independently fused with the benzene ring in carbazole in any feasible manner; and the ring C1 and ring C2 are each independently selected from any one of a substituted or unsubstituted C6-C30 aromatic ring and a substituted or unsubstituted C3-C30 heteroaromatic ring.

[0098] In Formula II, L 21 , Cy, R 21 , R 22 , R 23,Ar 21 The substituents substituted in the ring C1 and the ring C2 are independently selected from any one or a combination of at least two of halogen, cyano, nitro, hydroxyl, amino, carboxyl, mercapto, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C3-C20 cycloalkyl, C2-C20 heterocycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C30 arylamino, and C3-C30 heteroarylamino. Unless otherwise specified, the selection range of the substituents related to Formula II is as shown above and will not be repeated one by one.

[0099] Preferably, in Formula II, the L 21 Any one selected from a single bond, a substituted or unsubstituted C6-C20 (e.g., C6, C7, C8, C9, C10, C12, C14, C16, or C18, etc.) arylene group, a substituted or unsubstituted C3-C20 (e.g., C4, C5, C6, C7, C8, C9, C10, C12, C14, C16, or C18, etc.) heteroarylene group, and a single bond or

[0100] Preferably, X2 is O or S, and Cy in Formula II is selected from Any one of .

[0101] Preferably, in Formula II, Ar 21 Any one selected from the following substituted or unsubstituted groups:

[0102]

[0103]

[0104] Among them, U 3 Selected from O, S, NR 24 or CR 25 R 26 Any one of .

[0105] R 24 , R 25 , R 26 Each is independently selected from any one of hydrogen, C1-C20 straight or branched alkyl, C3-C20 cycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, and more preferably any one of C1-C6 (e.g., C2, C3, C4, C5, etc.) straight or branched alkyl, phenyl, biphenyl, terphenyl, naphthyl, phenylnaphthyl or naphthylphenyl; the R 25 and R 26Not connected or connected to form a ring through chemical bonds.

[0106]

[0107] In formula III, M is selected from O, S or NL 31 -Ar 31 Any one of .

[0108] L 31 is selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted C3-C30 heteroarylene group; when the L 31 When it is a single bond, it represents Ar 31 It is directly connected to the N atom via a single bond.

[0109] Ar 31 Any one selected from a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C3-C30 heteroaryl group, a substituted or unsubstituted C6-C30 arylamino group, and a substituted or unsubstituted C3-C30 heteroarylamino group.

[0110] In Formula III, 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 independently selected from N or CR 31 ; Multiple CR 31 R 31 Same or different.

[0111] R 31 are each independently selected from any one of hydrogen, halogen, cyano, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C6-C30 arylamino, substituted or unsubstituted C3-C30 heteroarylamino, substituted or unsubstituted C3-C30 heteroaryl, and substituted or unsubstituted C6-C30 aryl; the R 31 Each is independently not connected to the adjacent ring structure or connected to form a ring through a chemical bond.

[0112] In Formula III, L 31 ,Ar 31 , R 31The substituents substituted in are each independently selected from any one or a combination of at least two of halogen, cyano, nitro, hydroxyl, amino, carboxyl, mercapto, C1-C20 straight or branched alkyl, C2-C20 alkenyl, C1-C20 alkoxy, C1-C20 alkylsilyl, C1-C20 alkylamino, C3-C20 cycloalkyl, C2-C20 heterocycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, C6-C30 aryloxy, C3-C30 heteroaryloxy, C6-C30 arylamino, and C3-C30 heteroarylamino. Unless otherwise specified, the selection range of the substituents related to Formula III is as shown above and will not be repeated one by one.

[0113] Preferably, the compound of formula III is a compound of formula IIIA or IIIB:

[0114]

[0115] Among them, Z 1 , Z 2 , Z 3 , Z 4 , Z 5 , Z 6 , Z 7 , Z 8 , Z 9 , Z 10 , Z 11 , Z 12 , M has the same definition as in formula III; Z 13 , Z 14 Each independently selected from N or CR 31 , R 31 has the same definition as in formula III.

[0116] Preferably, in Formula IIIA (Formula III), Z 2 , Z 3 , Z 4 , Z 5 At most one (0 or 1) of them is N.

[0117] Preferably, in Formula IIIB, Z 3 , Z 4 , Z 5 At most one (0 or 1) of them is N; and / or, the Z 13 , Z 14 At most one (0 or 1) is N;

[0118] Preferably, in Formula IIIA (Formula III) and Formula IIIB, the Z 6 , Z 7 , Z 8 , Z9 At most one (0 or 1) of them is N.

[0119] Preferably, in Formula IIIA (Formula III) and Formula IIIB, the Z 10 , Z 11 , Z 12 At most one (0 or 1) of them is N.

[0120] Preferably, the L 31 Any one selected from a single bond, a substituted or unsubstituted C6-C20 (e.g., C6, C7, C8, C9, C10, C12, C14, C16, or C18, etc.) arylene group, and a substituted or unsubstituted C3-C20 (e.g., C4, C5, C6, C7, C8, C9, C10, C12, C14, C16, or C18, etc.) heteroarylene group, and a single bond, Any one of .

[0121] Preferably, the Ar 31 Any one or a combination of at least two selected from the following substituted or unsubstituted groups:

[0122]

[0123] Among them, Ar 32 ,Ar 33 Each is independently selected from any one of substituted or unsubstituted C6-C30 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C25, C28, etc.) aryl, substituted or unsubstituted C3-C30 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C25, C28, etc.) heteroaryl, and is further preferably any one of phenyl, biphenyl, naphthyl, phenylnaphthyl, naphthylphenyl, fluorenyl, 9,9-dimethylfluorenyl, 9,9-diphenylfluorenyl, and spirobifluorenyl.

[0124] Preferably, the R 31each independently selected from hydrogen, substituted or unsubstituted C1-C6 (e.g., C1, C2, C3, C4, C5, C6) straight or branched alkyl, substituted or unsubstituted C6-C30 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C25, C28, etc.) arylamino, substituted or unsubstituted C3-C30 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C25, C28, etc.) heteroaryl, substituted or unsubstituted C6-C 30 (for example, C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C25, C28, etc.) any one of aryl, further preferably hydrogen, methyl, ethyl, substituted or unsubstituted phenyl, substituted or unsubstituted biphenyl, substituted or unsubstituted terphenyl, substituted or unsubstituted naphthyl, substituted or unsubstituted fluorenyl, substituted or unsubstituted pyridyl, substituted or unsubstituted triazine, substituted or unsubstituted quinazolinyl, substituted or unsubstituted quinoxalinyl, substituted or unsubstituted pyrimidinyl, substituted or unsubstituted phenylbiphenylamino any one.

[0125] Preferably, Ar 32 ,Ar 33 , R 31 The substituents substituted in the above-mentioned substitution are each independently selected from halogen, cyano, nitro, hydroxyl, amino, carboxyl, nitro, mercapto, C1-C6 (e.g., C2, C3, C4, C5, etc.) straight or branched alkyl, C6-C30 (e.g., C6, C7, C8, C9, C10, C12, C14, C16, C18, C20, C22, C25, C28, etc.) aryl, C3-C30 (e.g., C4, C5, C6, C7, C8, C9, C10, C12, C14, C16, C18, C20, C22, C25, C28, etc.) aryl, , C18, C20, C22, C25, C28, etc.) heteroaryl, C6-C30 (e.g., C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C25, C28, etc.) arylamino, C3-C30 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16, C18, C20, C22, C25, C28, etc.) heteroarylamino, any one or a combination of at least two of them.

[0126] Preferably, the R 31 Each is independently not connected to the adjacent ring structure or is connected by a chemical bond to form ring F2.

[0127] Preferably, the ring F2 is selected from any one of a substituted or unsubstituted C6-C20 (e.g., C6, C7, C8, C9, C10, C12, C14, C16 or C18, etc.) aromatic ring, a substituted or unsubstituted C3-C20 (e.g., C4, C5, C6, C7, C8, C9, C10, C12, C14, C16 or C18, etc.) heteroaromatic ring, and more preferably Any one of .

[0128] Preferably, the compound having the structure shown in Formula I is selected from any one or a combination of at least two of the structures shown in the following compounds A1-A345:

[0129]

[0130]

[0131]

[0132]

[0133]

[0134]

[0135]

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142] Preferably, the compound having the structure shown in Formula II is selected from any one or a combination of at least two of the structures shown in the following compounds C1-C211:

[0143]

[0144]

[0145]

[0146]

[0147]

[0148]

[0149]

[0150]

[0151]

[0152]

[0153]

[0154] Preferably, the compound having the structure shown in Formula III is selected from any one or a combination of at least two of the structures shown in the following compounds B1 to B175:

[0155]

[0156]

[0157]

[0158]

[0159]

[0160]

[0161]

[0162]

[0163] The present invention does not impose any special limitation on the second host material, and any N-type host material and / or bipolar host material known in the art can be used in the present invention.

[0164] Preferably, the second host material comprises any one or a combination of at least two of the compounds having a structure as shown in Formula IV or Formula V:

[0165]

[0166] In formula IV, X4 is O or S.

[0167] In Formula IV, L 41 , L 42 are each independently selected from any one of a single bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted C3-C30 heteroarylene group; when the L 41When L is a single bond, it means that the aromatic amine N is directly connected to the benzene ring in formula IV through a single bond; 42 When it is a single bond, it represents Ar 43 It is directly connected to the benzene ring in formula IV via a single bond.

[0168] In Formula IV, Ar 41 ,Ar 42 Each is independently selected from any one of a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C3-C30 heteroaryl group.

[0169] In Formula IV, Ar 43 Any one selected from substituted or unsubstituted C3-C30 nitrogen-containing heteroaryl groups.

[0170] In Formula IV, R 41 , R 42 are each independently selected from any one of halogen, amino, substituted or unsubstituted C1-C20 straight or branched alkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted C3-C20 cycloalkyl, substituted or unsubstituted C1-C20 alkylsilyl, substituted or unsubstituted C1-C20 alkylamino, substituted or unsubstituted C1-C20 alkoxy, substituted or unsubstituted C1-C20 alkylthio, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C3-C30 heteroaryl, substituted or unsubstituted C6-C30 aryloxy, substituted or unsubstituted C6-C30 arylthio, substituted or unsubstituted C6-C30 arylsilyl, and substituted or unsubstituted C6-C30 arylamino; said R 41 , R 42 Each independently is not connected to the adjacent ring structure or is connected to form a ring through a chemical bond;

[0171] In formula IV, m1 and m2 represent substituents R 41 , R 42 The number of each is independently selected from an integer of 0-3, for example, 0, 1, 2 or 3. When m1, m2 ≥ 2, multiple (at least 2) R 41 , R 42 are the same or different groups.

[0172] In Formula IV, L 41 , L 42 ,Ar 41 ,Ar 42 ,Ar 43 , R 41 , R 42The substituted substituents are each independently selected from at least one of halogen, cyano, nitro, hydroxyl, amino, unsubstituted or R'substituted C1-C30 straight or branched alkyl, unsubstituted or R'substituted C1-C30 alkoxy, C3-C30 cycloalkyl, C2-C30 heterocycloalkyl, unsubstituted or R'substituted C6-C30 aryl, and unsubstituted or R'substituted C3-C30 heteroaryl; the R' is each independently selected from at least one of halogen, cyano, nitro, unsubstituted or halogenated C1-C10 straight or branched alkyl, C6-C20 aryl, or C3-C20 heteroaryl. Unless otherwise specified, the selection range of the substituents related to Formula IV is as shown above and will not be repeated one by one.

[0173] Preferably, formula IV may be formula IVA:

[0174] Preferably, in Formula IV, the L 41 , L 42 Each independently selected from a single bond, a substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) arylene group, more preferably a single bond, Any one of .

[0175] Preferably, in Formula IV, Ar 41 ,Ar 42 Each is independently selected from substituted or unsubstituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) aryl, Any one of the following; where Y A4 Selected from O, S, NR 43 or CR 44 R 45 Any one of .

[0176] R 43 , R 44 , R 45 Each is independently selected from any one of hydrogen, C1-C20 straight chain or branched alkyl, C3-C20 cycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, and further preferably any one of C1-C6 (e.g., C2, C3, C4, C5, etc.) straight chain or branched alkyl, phenyl, biphenyl, terphenyl, naphthyl, phenylnaphthyl or naphthylphenyl.

[0177] Preferably, in Formula IV, Ar 41 ,Ar 42 Each is independently selected from any one or a combination of at least two of the following groups:

[0178]

[0179] Preferably, in Formula IV, Ar 43 It is any one of electron-withdrawing substituted or unsubstituted C3-C30 nitrogen-containing heteroaryl groups, and is further preferably any one of the following substituted or unsubstituted groups:

[0180]

[0181] Among them, R 46 , R 47 , R 48 each independently selected from hydrogen, cyano, nitro, unsubstituted or R'substituted C1-C10 (e.g., C1, C2, C3, C4, C5, C6, C7, C8, C9 or C10) straight or branched alkyl, unsubstituted or R'substituted C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) aryl, unsubstituted or R'substituted C3-C20 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16 or C18, etc.) heteroaryl, any one of the aromatic groups; R' is independently selected from at least one of halogen, cyano, nitro, unsubstituted or halogenated C1-C10 (e.g., C1, C2, C3, C4, C5, C6, C7, C8, C9 or C10) straight or branched chain alkyl, C6-C20 (e.g., C6, C9, C10, C12, C14, C15, C16 or C18, etc.) aromatic groups or C3-C20 (e.g., C3, C4, C5, C6, C9, C10, C12, C14, C15, C16 or C18, etc.) heteroaryl groups.

[0182] Preferably, the R 46 , R 47 , R 48 are each independently selected from hydrogen, cyano, nitro, Any one of .

[0183] Preferably, in Formula IV, the R 41 , R 42 Each independently is not connected to the adjacent ring structure or is connected by a chemical bond to form a benzene ring.

[0184]

[0185] In Formula V, A5 is selected from substituted or unsubstituted Substituted or unsubstituted Any one of; Y5 is O or S; -* represents the connection site of the group.

[0186] In Formula V, Ar 51Any one selected from a substituted or unsubstituted C6-C30 aryl group and a substituted or unsubstituted C3-C30 heteroaryl group.

[0187] In Formula V, E5 is selected from any one of C10-C60 monovalent aromatic groups containing a condensed aromatic ring.

[0188] In Formula V, A5, Ar 51 , and the substituents substituted in E5 are each independently selected from any one or a combination of at least two of halogen, cyano, nitro, hydroxyl, amino, C1-C20 straight or branched alkyl, C1-C20 alkoxy, C3-C20 cycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, C6-C30 arylamino, and C3-C30 heteroarylamino. Unless otherwise specified, the selection range of the substituents related to Formula V is as shown above and will not be repeated one by one.

[0189] Preferably, in Formula V, A5 is selected from any one of the following groups:

[0190]

[0191] Preferably, in Formula V, Ar 51 Any one selected from the following substituted or unsubstituted groups:

[0192] Among them, Y A5 Selected from O, S, NR 51 or CR 52 R 53 Any one of .

[0193] R 51 , R 52 , R 53 Each is independently selected from any one of hydrogen, C1-C20 straight chain or branched alkyl, C3-C20 cycloalkyl, C6-C30 aryl, C3-C30 heteroaryl, and further preferably any one of C1-C6 (e.g., C2, C3, C4, C5, etc.) straight chain or branched alkyl, phenyl, biphenyl, terphenyl, naphthyl, phenylnaphthyl or naphthylphenyl.

[0194] Further preferably, in Formula V, the Ar 51 Any one selected from the following groups:

[0195]

[0196] Preferably, in Formula V, the E5 is selected from any one of the following groups:

[0197]

[0198]

[0199] Preferably, the compound having the structure shown in Formula IV is selected from any one or a combination of at least two of the structures shown in the following compounds N1-1 to N7-16:

[0200]

[0201]

[0202]

[0203]

[0204]

[0205]

[0206]

[0207]

[0208]

[0209]

[0210]

[0211]

[0212]

[0213]

[0214]

[0215]

[0216]

[0217]

[0218]

[0219] Preferably, the compound having the structure shown in Formula V is selected from any one or a combination of at least two of the structures shown in the following compounds N1-N171:

[0220]

[0221]

[0222]

[0223]

[0224]

[0225] Preferably, a charge generation layer (CGL) is disposed between any two adjacent light emitting units.

[0226] Preferably, the thickness of the charge generating layer is independently 5-15 nm, for example, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm, etc., more preferably 9-11 nm.

[0227] Preferably, the material of the charge generation layer (CGL) has a structure as shown in Formula VI:

[0228] R 61 -QR 62 Formula VI;

[0229] In formula VI, the bridging group Q is selected from one of the substituted or unsubstituted groups:

[0230]

[0231]

[0232] Among them, the wavy line and the *wavy line represent the two connection sites of the group respectively.

[0233] In Formula VI, R 61 , R 62 Each is independently selected from any one of substituted or unsubstituted C3-C60 heteroaryl groups, wherein the heteroaryl group contains at least one nitrogen atom.

[0234] Q, R 61 , R 62 The substituents in the substitution are each independently selected from any one or a combination of at least two of cyano, halogen, C1-C10 straight or branched alkyl, C3-C10 cycloalkyl, silicon, phosphino, C6-C30 aromatic amine, C6-C30 aromatic, and C2-C30 heteroaromatic; R 61 , R 62 The substituted substituents are each independently not connected to the adjacent ring structure or are connected to form a ring through a chemical bond.

[0235] Exemplarily, the material of the CGL includes but is not limited to a combination of one or more of the following L1-L90:

[0236]

[0237]

[0238]

[0239]

[0240]

[0241]

[0242]

[0243]

[0244]

[0245] Preferably, each of the light-emitting units independently further includes a hole transport region and an electron transport region, and the hole transport region and the electron transport region are respectively located on both sides of the light-emitting layer.

[0246] Preferably, the hole transport region includes any one of a hole injection layer, a hole transport layer, and an electron blocking layer, or a combination of at least two of them.

[0247] Preferably, the electron transport region includes any one of an electron transport layer and a hole blocking layer, or a combination of at least two of them.

[0248] Preferably, each of the light-emitting units independently comprises a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer and an electron transport layer which are arranged in sequence.

[0249] Preferably, an electron injection layer is further provided on the side of the cathode close to the light-emitting unit. Preferably, the electron injection layer is located between the cathode and the electron transport layer of the light-emitting unit closest to the cathode.

[0250] Preferably, each light-emitting unit is independently selected from any one of a red light-emitting unit, a green light-emitting unit or a blue light-emitting unit.

[0251] In a preferred technical solution, a substrate is provided on the side of the anode away from the light-emitting unit or the side of the cathode away from the light-emitting unit. The substrate is a glass or polymer material with excellent mechanical strength, thermal stability, waterproofness and transparency. In addition, a thin film transistor (TFT) may also be provided on the substrate used as a display.

[0252] In a preferred technical solution, the anode can be formed by sputtering or depositing a material used as an anode on a substrate; for example, transparent conductive oxide materials such as indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO2), zinc oxide (ZnO) and any combination thereof can be used. The cathode can be made of metals or alloys such as magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), ytterbium (Yb), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag) and any combination thereof.

[0253] The organic layer in each light-emitting unit can be formed on the electrode by vacuum thermal evaporation, spin coating, printing, etc. The compound used as the organic layer can be an organic small molecule, an organic macromolecule or a polymer, and a combination thereof.

[0254] In a preferred technical solution, the material of the hole transport layer can be selected from, but not limited to, phthalocyanine derivatives such as CuPc, conductive polymers or polymers containing conductive dopants such as polyphenylene ethylene, 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; wherein the aromatic amine derivatives include compounds shown in HT-1 to HT-52 below; or any combination thereof.

[0255]

[0256]

[0257]

[0258] In a preferred technical solution, the hole injection layer can be a single compound material or a combination of multiple compounds. For example, the hole injection layer can use one or more compounds of HT-1 to HT-52, or one or more compounds of HI-1 to HI-3; or one or more compounds of HT-1 to HT-52 can be doped with one or more compounds of HI-1 to HI-3.

[0259]

[0260] In a preferred technical solution, the material of the electron blocking layer may be, but not limited to, one or more compounds of the above-mentioned HT-1 to HT-52, or one or more compounds of the following PH-47 to PH-77; a mixture of, but not limited to, one or more compounds of HT-1 to HT-51 and one or more compounds of PH-47 to PH-77 may also be used.

[0261]

[0262]

[0263] The light-emitting layer includes a host material (Host), and the host material includes a combination of a first host material and a second host material, as described above. It also includes a luminescent dye (i.e., a dopant) that can emit different wavelength spectra. The light-emitting layer can be a monochrome light-emitting layer that emits a single color such as red, green, and blue. A plurality of monochrome light-emitting layers of different colors can be arranged in a plane according to a pixel pattern, or they can be stacked together to form a color light-emitting layer. When light-emitting layers of different colors are stacked together, they can be separated from each other or connected to each other. The light-emitting layer can also be a single color light-emitting layer that can simultaneously emit different colors such as red, green, and blue.

[0264] Depending on the technology, the light-emitting layer material can be phosphorescent electroluminescent material. In an OLED device, a single light-emitting technology can be used, or a combination of multiple different light-emitting technologies can be used. These different light-emitting materials classified by technology can emit light of the same color or different colors.

[0265] In a preferred technical solution, the light-emitting layer adopts phosphorescent electroluminescence technology, and the doping material (phosphorescent doping material, also known as guest material, dye) includes a green light material, which can be selected from, but not limited to, one or more combinations of GPD-1 to GPD-47 listed below.

[0266]

[0267]

[0268] Where D is deuterium.

[0269] In a preferred technical solution, the light-emitting layer adopts phosphorescent electroluminescence technology, and the doping material of the light-emitting layer includes a red light material, which can be selected from but not limited to one or more combinations of RPD-1 to RPD-28 listed below.

[0270]

[0271] In a preferred technical solution, the material of the electron transport layer can be selected from, but not limited to, any one or a combination of at least two of the compounds ET-1 to ET-73 listed below.

[0272]

[0273]

[0274]

[0275]

[0276] In a preferred technical solution, the hole blocking layer (HBL) is located between the electron transport layer and the light emitting layer. The hole blocking layer can be made of, but not limited to, one or more compounds of ET-1 to ET-73, or one or more compounds of PH-1 to PH-46; or a mixture of, but not limited to, one or more compounds of ET-1 to ET-73 and one or more compounds of PH-1 to PH-46.

[0277]

[0278]

[0279]

[0280] In a preferred technical solution, the material of the electron injection layer includes but is not limited to one or more combinations of the following: LiQ, LiF, NaCl, CsF, Li2O, Cs2CO3, BaO, Na, Li, Ca, Mg or Yb.

[0281] In a second aspect, the present invention provides a display device, wherein the display device comprises the organic stacked electroluminescent device as described in the first aspect.

[0282] Compared with the prior art, the present invention has the following beneficial effects:

[0283] In the organic stacked electroluminescent device provided by the present invention, a good balanced transmission effect of holes and electrons can be achieved through the dual host material design of the light-emitting layer in the light-emitting unit; at the same time, by adjusting the mass ratio of the two host materials in different light-emitting units, the transmission capacity of holes and electrons in each light-emitting unit is more effectively balanced and improved, and carrier transmission balance is achieved, thereby improving the luminous efficiency and luminous brightness of the organic stacked electroluminescent device, reducing the voltage, and increasing the working life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0284] Figure 1A schematic structural diagram of an organic stacked electroluminescent device provided in a specific embodiment of the present invention;

[0285] Among them, 1-glass substrate, 2-anode, 3-first hole injection layer, 4-first hole transport layer, 5-first electron blocking layer, 6-first light-emitting layer, 7-first hole blocking layer, 8-first electron transport layer, 9-first charge generation layer, 10-second hole injection layer, 11-second hole transport layer, 12-second electron blocking layer, 13-second light-emitting layer, 14-second hole blocking layer, 15-second electron transport layer, 16-electron injection layer, 17-cathode, and 18-external power supply. DETAILED DESCRIPTION

[0286] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0287] In the present invention, the first host material and the second host material can be prepared by methods disclosed in the prior art. For example, the synthesis method of the first host material having a structure shown in Formula I or Formula II can refer to the content disclosed in the prior art KR1020100131939A. The synthesis method of the first host material having a structure shown in Formula III can refer to the prior art CN111868210A.

[0288] The synthesis method of the second main body material having the structure shown in Formula IV can refer to the contents disclosed in the prior art CN110431136A, CN107973786A, KR20150136028A or CN113993862A. The synthesis method of the second main body material having the structure shown in Formula V can refer to the prior art CN113277988A, or can be prepared by a synthesis method known in the art, for example, according to the following representative synthesis route: Among them, E5, A5 and Ar 51 Having the same range as in Formula V; U 11 , U 12 Each independently The order of coupling reaction III-1 and coupling reaction III-2 is not particularly limited and can be adjusted according to actual conditions; coupling reaction III-1 and coupling reaction III-2 are carried out in the presence of a palladium catalyst.

[0289] In one embodiment, the HOMO energy level of the first host material is -5.00 eV to -5.50 eV, and / or the LUMO energy level of the second host material is -2.21 eV to -2.82 eV. The test method of LUMO energy level and HOMO energy level is as follows:

[0290] The main material to be tested was tested by cyclic voltammetry using an electrochemical workstation. The workstation used a three-electrode system, with a platinum electrode as the working electrode, a platinum wire electrode as the counter electrode, and an Ag wire electrode as the reference electrode. 0.5 g of the sample to be tested was dissolved in 5 mL of ultra-dry tetrahydrofuran, tetra-n-butylammonium perchlorate was used as the electrolyte salt, and the test sample was protected by nitrogen. The voltage range was -2 V to 2 V, the scanning speed was 100 mV / s, and the number of scanning circles was 2 circles. On the CV curve, the peak value, i.e., the oxidation potential E ox and reduction potential E red , according to the same settings as above, test the oxidation potential E of ferrocene Fe . Calculated HOMO = -((E ox -E Fe )+4.8), LUMO=-((E red -E Fe )+4.8).

[0291] The data of the LUMO energy level and HOMO energy level of the representative first host material and the second host material are shown in Table 1:

[0292] Table 1

[0293] Material No. HOMO(eV) LUMO(eV) A98 -5.35 -1.97 A105 -5.33 -2.03 A173 -5.35 -1.99 C151 -5.35 -1.99 C171 -5.37 -2.04 B148 -5.32 -1.98 N2-4 -5.28 -2.58 N2-31 -5.27 -2.71 N2-37 -5.27 -2.64 N2-41 -5.3 -2.68 N1 -5.26 -2.21 N19 -5.47 -2.74

[0294] Example 1

[0295] An organic stacked electroluminescent device comprises an anode, a cathode and two light-emitting units arranged between the anode and the cathode, and its structural schematic diagram is shown as follows Figure 1 As shown, it specifically includes a glass substrate 1, an anode 2 (ITO), a first hole injection layer 3, a first hole transport layer 4, a first electron blocking layer 5, a first light-emitting layer 6, a first hole blocking layer 7, a first electron transport layer 8, a first charge generation layer 9, a second hole injection layer 10, a second hole transport layer 11, a second electron blocking layer 12, a second light-emitting layer 13, a second hole blocking layer 14, a second electron transport layer 15, an electron injection layer 16, and a cathode 17 (magnesium silver electrode) which are stacked in sequence; the anode 2 and the cathode 17 are respectively connected to an external power supply 18.

[0296] The preparation method of the organic stacked electroluminescent device is as follows:

[0297] (1) a glass substrate coated with an ITO transparent conductive layer was ultrasonically treated in a commercial cleaning agent, rinsed in deionized water, ultrasonically degreased in an acetone / ethanol mixed solvent, baked in a clean environment until the water was completely removed, cleaned with ultraviolet light and ozone, and bombarded with a low-energy cation beam;

[0298] (2) Vacuum evaporation to prepare the first light-emitting unit:

[0299] Place the glass substrate with the anode in a vacuum chamber and evacuate the chamber to a vacuum of less than 1×10 -5 Pa, vacuum-deposit 10nm of a mixture of compound HT-4:HI-3 (97 / 3, w / w) as the first hole injection layer on the above-mentioned anode layer; 25nm of compound HT-4 as the first hole transport layer; 25nm of compound HT-52 as the first electron blocking layer; prepare a 36nm first light-emitting layer, using a mixture of the first host material A173 and the second host material N2-31 (A173:N2-31=1:1.5, w / w) as a dual-luminescent host material, and the dye RPD-10 ternary mixture together to form the first light-emitting layer, the mass percentage of the dye in the entire first light-emitting layer is 3%; prepare 5nm of compound ET-17 as the first hole blocking layer, prepare 20nm of a mixture of compound ET-61:ET-57 (50 / 50, w / w) as the first electron transport layer, and obtain the first light-emitting unit;

[0300] (3) Vacuum evaporating 10 nm of compound L1 on the first electron transport layer as the first charge generation layer;

[0301] (4) Vacuum evaporation to prepare the second light-emitting unit:

[0302] On the first charge generation layer, 10 nm of a mixture of compound HT-4:HI-3 (97 / 3, w / w) was vacuum-deposited in sequence as a second hole injection layer; 25 nm of compound HT-4 was used as a second hole transport layer; 45 nm of compound HT-52 was used as a second electron blocking layer; a 36 nm second light-emitting layer was prepared, and a mixture of the first host material A173 and the second host material N2-31 (A173:N2-31=1.5:1, w / w) was used as a dual-luminescent host material, and together with the dye RPD-10 ternary mixture, the second light-emitting layer was composed, and the mass percentage of the dye in the entire second light-emitting layer was 3%; 5 nm of compound ET-17 was prepared as a second hole blocking layer, and a 28 nm mixture of compound ET-61:ET-57 (50 / 50, w / w) was prepared as a second electron transport layer to obtain a second light-emitting unit;

[0303] (4) evaporating 1 nm of Yb on the second electron transport layer of the second light-emitting unit as an electron injection layer;

[0304] (5) Vacuum-depositing 13 nm of Mg:Ag (1:9) as a cathode on the electron injection layer to obtain the organic stacked electroluminescent device; during the aforementioned vacuum evaporation process, the total evaporation rate of all organic layers is controlled at 0.1 nm / s, the dye evaporation rate is controlled at 0.03 nm / s, the Yb evaporation rate is controlled at 0.1 nm / s, and the Mg and Ag evaporation rates of the metal electrodes are controlled at 0.2 and 1.8 nm / s (Mg:Ag=1:9).

[0305] Examples 2-50, Comparative Examples 1-7

[0306] An organic stacked electroluminescent device, which differs from Example 1 only in that the main materials of the light-emitting layer are the compounds shown in Tables 2 to 4, respectively, and the other layers, thicknesses and materials in each light-emitting unit are the same as those of the light-emitting unit in Example 1; for an organic stacked electroluminescent device with a number of light-emitting subunits greater than 2, the preparation method thereof differs from Example 1 in that steps (3) and (4) are repeated until all light-emitting units are prepared, and then 1 nm of Yb is vacuum-evaporated on the electron transport layer of the last light-emitting subunit as an electron injection layer, and then 13 nm of Mg:Ag (1:9) is vacuum-evaporated on the electron injection layer as a cathode.

[0307] The performance test of the organic stacked electroluminescent devices provided in Examples 1-50 and Comparative Examples 1-7 was carried out in the following manner:

[0308] At the same current density, a digital source meter and a brightness meter were used to measure the driving voltage and current efficiency of each stacked organic electroluminescent device. Specifically, the voltage was increased at a rate of 0.1 V per second, and the current density of the stacked organic electroluminescent device was measured when it reached 10 mA / cm 2 The voltage at this time is the working voltage, and the brightness at this time is measured at the same time. The ratio of brightness to current density is the current efficiency.

[0309] The test method of LT97 life is as follows: at 20mA / cm 2 Under constant current density, measure the time required for the brightness to decay to 97% of the initial brightness;

[0310] For an organic stacked electroluminescent device having two light-emitting units, the test values ​​of voltage, current efficiency, and LT97 life of Comparative Example 1 are recorded as 100%, and the current efficiency and LT97 life of other embodiments and comparative examples are the ratios of their respective test values ​​to the test values ​​of Comparative Example 1; for an organic stacked electroluminescent device having three light-emitting units, the test values ​​of voltage, current efficiency, and LT97 life of Comparative Example 5 are recorded as 100%, and the current efficiency and LT97 life of other embodiments are the ratios of their respective test values ​​to the test values ​​of Comparative Example 5. Value; for an organic stacked electroluminescent device with four light-emitting units, the test values ​​of voltage, current efficiency, and LT97 life of Comparative Example 6 are recorded as 100%, and the current efficiency and LT97 life of other embodiments are the ratios of their respective test values ​​to the test values ​​of Comparative Example 6; for a stacked organic electroluminescent device with five light-emitting sub-units, the test values ​​of voltage, current efficiency, and LT97 life of Comparative Example 7 are recorded as 100%, and the current efficiency and LT97 life of other embodiments are the ratios of their respective test values ​​to the test values ​​of Comparative Example 7.

[0311] The test results are shown in Tables 2 to 4; "EML" in Table 2 means light-emitting layer; taking Comparative Example 1 as an example, " / " represents that it has 2 light-emitting units, that is, there is no third EML, fourth EML and fifth EML; the other " / " are the same; the proportions in Tables 2 to 4 all represent the mass ratio of the first main material to the second main material.

[0312] Table 2

[0313]

[0314]

[0315]

[0316] Table 3

[0317]

[0318] Table 4

[0319]

[0320]

[0321] According to the performance test data in Table 2, Table 3 and Table 4, in the organic stacked electroluminescent device provided by the present invention, by setting a dual host material in the light-emitting layer of each light-emitting unit, and adjusting the ratio of the first host material to the second host material in each light-emitting unit, the ability of the light-emitting unit to absorb holes and electrons from the CGL layer is adjusted, and carrier accumulation is reduced, thereby achieving carrier transmission balance, thereby improving the luminous efficiency and life of the organic stacked electroluminescent device, and effectively reducing the operating voltage.

[0322] The applicant declares that the present invention uses the above embodiments to illustrate the organic stacked electroluminescent device of the present invention and the display device containing the same, but the present invention is not limited to the above process steps, that is, it does not mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. An organic stacked electroluminescent device, characterized in that: The organic stacked electroluminescent device comprises an anode, a cathode, and a first light-emitting unit and a second light-emitting unit disposed between the anode and the cathode; the distance between the first light-emitting unit and the anode is less than the distance between the first light-emitting unit and the cathode, and the distance between the second light-emitting unit and the anode is greater than the distance between the second light-emitting unit and the cathode; The first light-emitting unit and the second light-emitting unit each independently include a light-emitting layer; the main material of the light-emitting layer each independently includes a combination of a first main material and a second main material; the first main material is a P-type main material, and the second main material is an N-type main material and / or a bipolar main material; The mass of the first host material in the first light-emitting unit is less than the mass of the second host material in the first light-emitting unit; The mass of the first host material in the second light-emitting unit is greater than the mass of the second host material in the second light-emitting unit.

2. The organic stacked electroluminescent device according to claim 1, characterized in that: The mass ratio of the first host material to the second host material in the first light-emitting unit is 1:(1.01-9), preferably 1:(1.01-5), and more preferably 1:(1.01-1.5); And / or, the mass ratio of the first host material to the second host material in the second light-emitting unit is (1.01-9):1, preferably (1.01-5):1, and further preferably (1.01-1.5):

1.

3. The organic stacked electroluminescent device according to claim 1, characterized in that: The first host material in the first light-emitting unit and the first host material in the second light-emitting unit are the same material; and / or the second host material in the first light-emitting unit and the second host material in the second light-emitting unit are the same material.

4. The organic stacked electroluminescent device according to claim 1, characterized in that: At least three light-emitting units are arranged between the anode and the cathode; the direction from the anode to the cathode is taken as the first direction, and the mass content of the first main material in each light-emitting unit increases along the first direction.

5. The organic stacked electroluminescent device according to claim 1, characterized in that: A third light-emitting unit is further provided between the anode and the cathode, and the distance between the third light-emitting unit and the anode is equal to the distance between the third light-emitting unit and the cathode; the third light-emitting unit includes a light-emitting layer; Preferably, the mass ratio of the first host material to the second host material in the light-emitting layer of the third light-emitting unit is 1:

1.

6. The organic stacked electroluminescent device according to claim 5, characterized in that: The first host material in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is the same material; and / or the second host material in the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is the same material.

7. The organic stacked electroluminescent device according to claim 1, characterized in that: The total number of light-emitting units between the anode and the cathode is 2n, the direction from the anode to the cathode is a first direction, the light-emitting units are sequentially arranged according to the first direction, and the mass ratio of the first host material to the second host material in the first light-emitting unit to the nth light-emitting unit is independently 1:(1.01-9), preferably 1:(1.01-1.5); The mass ratio of the first host material to the second host material in the n+1th to 2nth light-emitting units is independently (1.01-9):1, and more preferably (1.01-1.5):1; Wherein, n is an integer ≥ 1; Preferably, the mass content of the first host material in each light-emitting unit increases along the first direction.

8. The organic stacked electroluminescent device according to claim 1, characterized in that: The total number of light-emitting units between the anode and the cathode is 2n+1, the direction from the anode to the cathode is a first direction, the light-emitting units are sequentially arranged according to the first direction, and the mass ratio of the first host material to the second host material in the first light-emitting unit to the nth light-emitting unit is independently 1:(1.01-9), preferably 1:(1.01-1.5); The mass ratio of the first host material to the second host material in the n+1th light-emitting unit is 1:1; The mass ratio of the first host material to the second host material in the n+2th to 2n+1th light-emitting units is independently (1.01-9):1, and more preferably (1.01-1.5):1; Wherein, n is an integer ≥ 1; Preferably, the mass content of the first host material in each light-emitting unit increases along the first direction.

9. The organic stacked electroluminescent device according to any one of claims 1 to 8, characterized in that: The HOMO energy level of the first host material is -5.00 eV to -5.50 eV; and / or the LUMO energy level of the second host material is -2.21 eV to -2.82 eV.

10. The organic stacked electroluminescent device according to any one of claims 1 to 8, characterized in that: A charge generation layer is disposed between any two adjacent light-emitting units.

11. The organic stacked electroluminescent device according to any one of claims 1 to 8, characterized in that: Each light-emitting unit is independently selected from any one of a red light-emitting unit, a green light-emitting unit or a blue light-emitting unit.

12. A display device, characterized in that: The display device comprises the organic stacked electroluminescent device according to any one of claims 1 to 11.

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