Compound, hole transport material, organic electroluminescent device and display device
阅读说明：本技术 一种化合物、空穴传输材料、有机电致发光器件和显示装置 (Compound, hole transport material, organic electroluminescent device and display device ) 是由 邢其锋 丰佩川 孙伟 胡灵峰 陈跃 于 2020-06-17 设计创作，主要内容包括：本发明实施例提供了一种通式(Ⅰ)的化合物,其可以用于有机电致发光器件,作为空穴传输材料。该化合物,具有不对称双取代二苯并杂环的母体结构,原子间的键能高,具有良好的热稳定性,从而提高材料的寿命。用作空穴传输层材料与相邻层级间具有合适的能级水平,有利于空穴的注入和迁移,能够有效降低驱动电压,同时具有较高的空穴迁移速率,可以有效提升器件的发光效率。(The embodiment of the invention provides a compound with a general formula (I), which can be used in an organic electroluminescent device as a hole transport material. The compound has a parent structure of an asymmetric disubstituted dibenzoheterocycle, high bond energy between atoms and good thermal stability, thereby prolonging the service life of the material. The material used as the hole transport layer has a proper energy level with the adjacent layers, is beneficial to the injection and the migration of holes, can effectively reduce the driving voltage, has higher hole migration rate, and can effectively improve the luminous efficiency of the device.)
1. A compound having the structure of formula (I):
wherein the content of the first and second substances,
R1-R4each independently selected from hydrogen, deuterium, C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30Heteroaryl radical, R1-R4Wherein two adjacent groups can be connected to form a ring;
A1-A4any two of the compounds are respectively formula (II) and formula (III), the rest is hydrogen, formula (II) and formula (III) are in meta position, formula (I) is respectively connected with N in formula (II) and formula (III) through L1 and L2*Connecting; l1 and L2 are each independently selected from the group consisting of a bond, C unsubstituted or substituted with Ra6-C30Aromatic compound or C unsubstituted or substituted by Ra3-C30A subunit of a heteroaromatic compound;
Ar1-Ar3each independently selected from C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30A heteroaryl group;
x and Y are each independently selected from O, S, CR5R6、NR7，R5And R6Each independently selected from C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30Heteroaryl radical, R5And R6Can be used forAre interconnected to form a ring, R7Selected from C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30A heteroaryl group;
Z1-Z8each independently selected from CR8Or N, R8Each independently selected from hydrogen, deuterium, C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30Heteroaryl, adjacent R8Can be connected into a ring;
each heteroatom in the heteroaryl group is independently selected from O, S, N;
the substituents Ra of the various groups are identical or different and are each independently selected from deuterium, halogen, nitro, cyano, C1-C4Alkyl, phenyl, biphenyl, terphenyl, naphthyl.
2. The compound of claim 1, wherein,
R1-R4、R8each independently selected from hydrogen, deuterium, C1-C6Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C18Aryl, C unsubstituted or substituted by Ra3-C15A heteroaryl group;
l1 and L2 are each independently selected from the group consisting of a bond, C unsubstituted or substituted with Ra6-C18Aromatic compound or C unsubstituted or substituted by Ra3-C15A subunit of a heteroaromatic compound;
Ar1-Ar3each independently selected from C unsubstituted or substituted by Ra6-C18Aryl, C unsubstituted or substituted by Ra3-C15A heteroaryl group;
R5and R6Each independently selected from C1-C6Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C18Aryl, C unsubstituted or substituted by Ra3-C15Heteroaryl radical, R7Selected from C unsubstituted or substituted by Ra6-C18Aryl, C unsubstituted or substituted by Ra3-C15A heteroaryl group;
said C unsubstituted or substituted by Ra3-C15The heteroatoms in the heteroaryl groups are each independently selected from O, S, N.
3. The compound of claim 1, wherein R1-R4、R8Each independently selected from hydrogen, methyl, ethyl, cyclopentyl, cyclohexyl, the following groups unsubstituted or substituted with Ra: phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, fluorenyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, quinolyl, isoquinolyl, quinazolinyl, quinoxalinyl, cinnolinyl, naphthyridinyl, triazinyl, pyridopyrazinyl, furyl, benzofuryl, dibenzofuryl, aza-dibenzofuryl, thienyl, benzothienyl, dibenzothienyl, aza-dibenzothienyl, 9-dimethylfluorenyl, spirofluorenyl, arylamino, carbazolyl.
4. The compound of claim 1, wherein Ar1-Ar3Each independently selected from the following unsubstituted or substituted with Ra: phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, fluorenyl, benzofuranyl, dibenzofuranyl, benzothienyl, dibenzothienyl, 9-dimethylfluorenyl, spirofluorenyl, arylamine, carbazolyl.
5. The compound of claim 1, wherein R5And R6Each independently selected from methyl, ethyl, cyclopentyl, cyclohexyl, the following groups unsubstituted or substituted with Ra: phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, fluorenyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, quinolyl, isoquinolyl, quinazolinyl, quinoxalinyl, cinnolinyl, naphthyridinyl, triazinyl, pyridopyrazinyl, furyl, benzofuryl, pyridyl,Dibenzofuranyl, aza-dibenzofuranyl, thienyl, benzothienyl, dibenzothienyl, aza-dibenzothienyl, 9-dimethylfluorenyl, spirofluorenyl, arylamine, carbazolyl.
6. The compound of claim 1, wherein R7Selected from the following unsubstituted or substituted by Ra: phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, fluorenyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, quinolyl, isoquinolyl, quinazolinyl, quinoxalinyl, cinnolinyl, naphthyridinyl, triazinyl, pyridopyrazinyl, furyl, benzofuryl, dibenzofuryl, aza-dibenzofuryl, thienyl, benzothienyl, dibenzothienyl, aza-dibenzothienyl, 9-dimethylfluorenyl, spirofluorenyl, arylamino, carbazolyl.
7. The compound of claim 1, wherein L1 and L2 are each independently selected from the group consisting of a bond, a subunit of the following compound unsubstituted or substituted with Ra: benzene, biphenyl, terphenyl, naphthalene, phenanthrene, triphenylene, fluorene, pyridine, pyridazine, pyrimidine, pyrazine, quinoline, isoquinoline, quinazoline, quinoxaline, cinnoline, naphthyridine, triazine, pyridopyrazine, furan, benzofuran, dibenzofuran, aza-dibenzofuran, thiophene, benzothiophene, dibenzothiophene, aza-dibenzothiophene, 9-difluorene, spirofluorene, arylamine, carbazole.
8. The compound of claim 1 selected from any one of the following structures a1-a 30:
9. a hole transport material comprising at least one compound according to any one of claims 1 to 8.
10. An organic electroluminescent device comprising at least one hole transport material as claimed in claim 9.
11. A display device comprising the organic electroluminescent device according to claim 10.
Technical Field
The invention relates to the field of organic light-emitting display, in particular to a compound, a hole transport material, an organic electroluminescent device and a display device.
Background
The organic electroluminescent display (hereinafter referred to as OLED) has a series of advantages of self-luminescence, low-voltage dc driving, full curing, wide viewing angle, light weight, simple composition and process, etc., and compared with the liquid crystal display, the organic electroluminescent display does not need a backlight source, and has a large viewing angle, low power, a response speed 1000 times that of the liquid crystal display, and a manufacturing cost lower than that of the liquid crystal display with the same resolution. Therefore, the organic electroluminescent device has very wide application prospect. With the continuous advance of OLED technology in both lighting and display fields, organic electroluminescent devices with good efficiency and long lifetime provide great opportunities and challenges for the development of materials. As an important functional material, the hole transport material has a direct influence on the mobility of holes and ultimately on the luminous efficiency of the OLED. However, the hole transport materials currently used in OLEDs have low hole transport rates and poor energy level matching with adjacent layers, which severely limits the light emitting efficiency of the OLEDs and the display function of the OLED display devices.
Disclosure of Invention
An object of embodiments of the present invention is to provide a compound having a high hole transfer rate when used as a hole transport layer, so that the light emitting efficiency of an organic electroluminescent device can be improved.
In a first aspect, the present invention provides a compound having the structure of formula (I):
wherein the content of the first and second substances,
R1-R4each independently selected from hydrogen, deuterium, C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30Heteroaryl radical, R1-R4Wherein two adjacent groups can be connected to form a ring;
A1-A4any two of the compounds are respectively formula (II) and formula (III), the rest is hydrogen, formula (II) and formula (III) are in meta position, formula (I) is respectively connected with N in formula (II) and formula (III) through L1 and L2*Connecting; l1 and L2 are each independently selected from the group consisting of a bond, C unsubstituted or substituted with Ra6-C30Aromatic compound or C unsubstituted or substituted by Ra3-C30A subunit of a heteroaromatic compound;
Ar1-Ar3selected from C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30A heteroaryl group;
x and Y are each independently selected from O, S, CR5R6、NR7，R5And R6Each independently selected from C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl radicalsC unsubstituted or substituted by Ra3-C30Heteroaryl radical, R7Selected from C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30A heteroaryl group;
Z1-Z8each independently selected from CR8Or N, R8Selected from hydrogen, deuterium, C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30Heteroaryl, adjacent R8Can be connected into a ring;
c unsubstituted or substituted by Ra3-C30Each heteroatom in the heteroaryl group is independently selected from O, S, N;
the substituents Ra of the various groups are identical or different and are each independently selected from deuterium, halogen, nitro, cyano, C1-C4Alkyl, phenyl, biphenyl, terphenyl, naphthyl.
In a second aspect, the present application provides a hole transport material comprising at least one of the compounds provided herein.
In a third aspect, the present application provides an organic electroluminescent device comprising at least one of the hole transport materials provided herein.
In a fourth aspect, the present application provides a display device comprising the organic electroluminescent device provided by the present application.
The compound provided by the application has a parent structure of an asymmetric disubstituted dibenzoheterocycle, has high bond energy among atoms and good thermal stability, thereby prolonging the service life of the material. The material used as the hole transport layer has a proper energy level with the adjacent layers, is beneficial to the injection and the migration of holes, can effectively reduce the driving voltage, has higher hole migration rate, and can effectively improve the luminous efficiency of the device. In addition, the compound provided by the invention has the advantages of simple preparation process and easily obtained raw materials, and is suitable for industrial production.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a typical organic electroluminescent device.
Detailed Description
In a first aspect, the present invention provides a compound having the structure of formula (I):
wherein the content of the first and second substances,
R1-R4each independently selected from hydrogen, deuterium, C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30Heteroaryl radical, R1-R4Wherein two adjacent groups can be connected to form a ring;
A1-A4any two of the compounds are respectively formula (II) and formula (III), the rest is hydrogen, formula (II) and formula (III) are in meta position, formula (I) is respectively connected with N in formula (II) and formula (III) through L1 and L2*Connecting; l1 and L2 are each independently selected from the group consisting of a bond, C unsubstituted or substituted with Ra6-C30Aromatic compound or C unsubstituted or substituted by Ra3-C30A subunit of a heteroaromatic compound;
Ar1-Ar3selected from C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30A heteroaryl group;
x and Y are each independently selected from O, S, CR5R6、NR7，R5And R6Each independently selected from C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30Heteroaryl radical, R7Selected from C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30A heteroaryl group;
Z1-Z8each independently selected from CR8Or N, R8Selected from hydrogen, deuterium, C1-C10Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C30Aryl, C unsubstituted or substituted by Ra3-C30Heteroaryl, adjacent R8Can be connected into a ring;
c unsubstituted or substituted by Ra3-C30Each heteroatom in the heteroaryl group is independently selected from O, S, N;
the substituents Ra of the various groups are identical or different and are each independently selected from deuterium, halogen, nitro, cyano, C1-C4Alkyl, phenyl, biphenyl, terphenyl, naphthyl.
In a preferred embodiment, R1-R4、R8Each independently selected from hydrogen, deuterium, C1-C6Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C18Aryl, C unsubstituted or substituted by Ra3-C15Heteroaryl, the heteroatoms in the heteroaryl each independently selected from O, S, N; l1 and L2 are each independently selected from the group consisting of a bond, C unsubstituted or substituted with Ra6-C18Aromatic compound or C unsubstituted or substituted by Ra3-C15A subunit of a heteroaromatic compound; ar (Ar)1-Ar3Each independently selected from C unsubstituted or substituted by Ra6-C18Aryl, C unsubstituted or substituted by Ra3-C15Heteroaryl, the heteroatoms in the heteroaryl each independently selected from O, S, N; r5And R6Each independently selected from C1-C6Alkyl radical, C3-C6Cycloalkyl, C unsubstituted or substituted by Ra6-C18Aryl, C unsubstituted or substituted by Ra3-C15Heteroaryl radical, R7Selected from C unsubstituted or substituted by Ra6-C18Aryl, C unsubstituted or substituted by Ra3-C15Heteroaryl, the heteroatoms in the heteroaryl each independently selected from O, S, N; c unsubstituted or substituted by Ra3-C30The heteroatoms in the heteroaryl groups are each independently selected from O, S, N.
In one embodiment, R1-R4、R8Each independently selected from hydrogen, methyl, ethyl, cyclopentyl, cyclohexyl, the following groups unsubstituted or substituted with Ra: phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, fluorenyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, quinolyl, isoquinolyl, quinazolinyl, quinoxalinyl, cinnolinyl, naphthyridinyl, triazinyl, pyridopyrazinyl, furyl, benzofuryl, dibenzofuryl, aza-dibenzofuryl, thienyl, benzothienyl, dibenzothienyl, aza-dibenzothienyl, 9-dimethylfluorenyl, spirofluorenyl, arylamino, carbazolyl.
In one embodiment, Ar1-Ar3Each independently selected from the following unsubstituted or substituted with Ra: phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, fluorenyl, benzofuranyl, dibenzofuranyl, benzothienyl, dibenzothienyl, 9-dimethylfluorenyl, spirofluorenyl, arylamine, carbazolyl.
In one embodiment, R5And R6Each independently selected from methyl, ethyl, cyclopentyl, cyclohexyl, the following groups unsubstituted or substituted with Ra: phenyl, phenyl,Biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, fluorenyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, quinolyl, isoquinolyl, quinazolinyl, quinoxalinyl, cinnolinyl, naphthyridinyl, triazinyl, pyridopyrazinyl, furanyl, benzofuranyl, dibenzofuranyl, aza-dibenzofuranyl, thienyl, benzothienyl, dibenzothienyl, aza-dibenzothienyl, 9-dimethylfluorenyl, spirofluorenyl, arylamino, carbazolyl.
In one embodiment, R7Selected from the following unsubstituted or substituted by Ra: phenyl, biphenyl, terphenyl, naphthyl, phenanthryl, triphenylene, fluorenyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, quinolyl, isoquinolyl, quinazolinyl, quinoxalinyl, cinnolinyl, naphthyridinyl, triazinyl, pyridopyrazinyl, furyl, benzofuryl, dibenzofuryl, aza-dibenzofuryl, thienyl, benzothienyl, dibenzothienyl, aza-dibenzothienyl, 9-dimethylfluorenyl, spirofluorenyl, arylamino, carbazolyl.
In one embodiment, L1 and L2 are each independently selected from the group consisting of a bond, a subunit of the following compound unsubstituted or substituted with Ra: benzene, biphenyl, terphenyl, naphthalene, phenanthrene, triphenylene, fluorene, pyridine, pyridazine, pyrimidine, pyrazine, quinoline, isoquinoline, quinazoline, quinoxaline, cinnoline, naphthyridine, triazine, pyridopyrazine, furan, benzofuran, dibenzofuran, aza-dibenzofuran, thiophene, benzothiophene, dibenzothiophene, aza-dibenzothiophene, 9-difluorene, spirofluorene, arylamine, carbazole.
In one embodiment, the compound of formula (I) is selected from any one of the following structures A1-A30:
the compound provided by the invention has a parent structure of an asymmetric disubstituted dibenzoheterocycle, high bond energy between atoms and good thermal stability, thereby being beneficial to prolonging the service life of materials.
In a second aspect, the present application provides a hole transport material comprising at least one of the compounds provided herein.
Fig. 1 shows a schematic view of a typical organic electroluminescent device, which includes an anode 2 and a cathode 8 on a substrate 1, and an organic material layer, which may be a multi-layered structure, between the anode 2 and the cathode 8. For example, the organic material layer may include a hole injection layer 3, a hole transport layer 4, a light emitting layer 5, an electron transport layer 6, an electron injection layer 7, and the like.
It is to be understood that fig. 1 schematically shows the structure of a typical organic electroluminescent device, and the present application is not limited to this structure, and the hole transport material of the present application may be used in any type of organic electroluminescent device. For example, a typical organic electroluminescent device may further include an electron blocking layer, a hole blocking layer, a light extraction layer, and the like, and in the present application, these layers may be added or omitted according to actual needs.
In an organic electroluminescent device, a hole transport material has good electron donating property, a high HOMO energy level and high hole mobility, so that the transport of current carriers is facilitated, and the luminous efficiency of an OLED is improved.
The hole transport material provided by the application has a parent structure of an asymmetric disubstituted dibenzoheterocycle, has high bond energy among atoms and good thermal stability, and can prolong the service life of the hole transport material.
In a third aspect, the present application provides an organic electroluminescent device comprising the hole transport material provided herein. There is no limitation on the kind and structure of the organic electroluminescent device in the present application, and various types and structures of organic electroluminescent devices known in the art may be used, in which a hole transport layer is disposed between a hole injection layer and a light emitting layer.
The organic electroluminescent device of the present invention may be a light-emitting device having a top emission structure, and examples thereof include a light-emitting device comprising an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a transparent or translucent cathode in this order on a substrate. The thickness of the hole transport layer is 80-140 nm.
The organic electroluminescent element of the present invention may be a light-emitting element having a bottom emission structure, and may include a structure in which a transparent or translucent anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode are sequentially provided on a substrate.
The organic electroluminescent element of the present invention may be a light-emitting element having a double-sided light-emitting structure, and may include a structure in which a transparent or translucent anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a transparent or translucent cathode are sequentially provided on a substrate.
In addition, a hole injection layer may be provided between the anode electrode and the hole transport layer. An electron blocking layer is provided between the hole transport layer and the light emitting layer. A hole blocking layer is provided between the light emitting layer and the electron transport layer. An electron injection layer is provided between the electron transport layer and the cathode electrode. However, the structure of the organic electroluminescent device of the present invention is not limited to the above-described specific structure, and the above-described layers may be omitted or simultaneously provided, if necessary. For example, the organic electroluminescent device may comprise an anode made of metal, a hole injection layer (5-20nm), a hole transport layer (80-140nm), a light emitting layer (150-400nm), an electron transport layer (300-800nm), an electron injection layer (5-20nm), and a transparent or semitransparent cathode (50-80nm) in this order on a substrate.
In the organic electroluminescent device of the present invention, any material used for the layer as in the prior art can be used for the layer other than the hole transport layer comprising the hole transport material provided by the present invention.
The organic electroluminescent device of the present application is explained below with reference to fig. 1.
In the present application, the substrate 1 is not particularly limited, and a conventional substrate used in the organic electroluminescent device in the related art, for example, glass, polymer material, etc. may be used.
In the present application, the material of the anode 2 is not particularly limited, and may be selected from anode materials known in the art. For example, metals, alloys, conductive compounds, or the like have a high work function (4eV or more than 4 eV). More specifically, the conductive material may be a transparent conductive material such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), tin dioxide (SnO2), or zinc oxide (ZnO), a metal material such as silver and an alloy thereof, or aluminum and an alloy thereof, an organic conductive material such as PEDOT (poly 3, 4-ethylenedioxythiophene), or a multilayer structure of the above materials. Wherein the thickness of the anode 2 varies depending on the material used.
In the present application, the hole injection layer 3 is not particularly limited, and a hole injection material known in the art or a hole transport material provided herein may be selected as a host material, and a p-type dopant may be added, for example, the hole injection material may be selected from at least one of the following HT-1 to HT-31 compounds:
in the present application, the kind of the p-type dopant is not particularly limited, and various p-type dopants known in the art may be employed, for example, the p-type dopant may be selected from at least one of the following compounds:
in the present application, the organic electroluminescent device comprises a hole transport layer 4, the hole transport layer 4 comprising at least one of the hole transport materials of the present application. The hole transport layer 4 may also comprise any combination of at least one of the hole transport materials of the invention with known hole transport materials. The currently known hole transport material may be selected from at least one of the above-mentioned HT-1 to HT-31 compounds, but is not limited to the above-mentioned compounds.
The hole transport material provided by the application has a parent structure of asymmetric disubstituted dibenzo heterocycle, is applied to a hole transport layer 4, has a suitable energy level with adjacent layers, is favorable for injection and migration of holes, can effectively reduce driving voltage, has a high hole migration rate, and can effectively improve the luminous efficiency of a device.
In the present application, the organic electroluminescent device includes a light emitting layer 5, and a light emitting material in the light emitting layer 5 is not particularly limited, and any light emitting material known to those skilled in the art may be used, for example, the light emitting material may include a host material and a guest material. The host material may be selected from at least one of the following GPH-1 to GPH-80 compounds:
in a preferred embodiment of the present application, the light-emitting layer employs the technique of electroluminescence. The guest material in the light-emitting layer 5 is a fluorescent or phosphorescent dopant, which may be selected from, but is not limited to, at least one of the following RPD-1 to RPD-28 compounds. The amount of the dopant is not particularly limited and may be an amount well known to those skilled in the art.
In the present application, the organic electroluminescent device comprises an electron transport layer 6, the electron transport layer 6 comprising an electron transport material and an n-type dopant, wherein the n-type dopant is present in an amount of 50 mol%. The electron transport material is not particularly limited, and any electron transport material known to those skilled in the art may be used, the electron transport material being selected from at least one of the compounds of ET-1 to ET-57 listed below:
in the present application, the kind of the n-type dopant is not particularly limited, and various n-type dopants known in the art may be used. For example, the n-type dopant may be a compound represented by the following formula:
in the present application, the organic electroluminescent device may further include an electron injection layer 7, and the electron injection layer 7 may use an electron injection material known in the art, for example, may be selected from, but not limited to, LiQ, LiF, NaCl, CsF, Li in the prior art2O、Cs2CO3At least one of BaO, Na, Li, Ca and the like.
In the present application, the organic electroluminescent device comprises a cathode 8, and the material of the cathode 8 is not particularly limited, and may be selected from, but not limited to, metals such as Al, mg-ag mixture, LiF/Al, ITO, etc., metal mixtures, oxides, etc.
In a fourth aspect, the present application provides a display device comprising the organic electroluminescent device provided by the present application. The display device includes, but is not limited to, a display, a television, a mobile communication terminal, a tablet computer, and the like.
The method for preparing the organic electroluminescent device of the present application is not particularly limited, and any method known in the art may be used, for example, the present application may be prepared by the following preparation method:
(1) cleaning an anode 2 on an OLED device substrate 1 for top emission, respectively carrying out steps of medicinal washing, water washing, hairbrush, high-pressure water washing, air knife and the like in a cleaning machine, and then carrying out heat treatment;
(2) evaporating a hole injection layer 3 on the anode 2 in a vacuum evaporation mode;
(3) vacuum evaporating a hole transport material on the hole injection layer 3 to form a hole transport layer 4;
(4) a luminescent layer 5 is evaporated on the hole transport layer 4 in vacuum, wherein the luminescent layer 5 comprises a host material and a guest material;
(5) vacuum evaporating an electron transport material on the luminescent layer 5 to form an electron transport layer 6;
(6) an electron injection layer 7 is vacuum-deposited on the electron transport layer 6, and the material of the electron injection layer 7 is an electron injection material selected from LiQ, LiF, NaCl, CsF, and Li, for example2O、Cs2CO3One or more of BaO, Na, Li, Ca and other electron injection materials;
(7) vacuum evaporating an Al layer on the electron injection layer 7, wherein the Al layer is a cathode 8;
the above description has been made only of the structure of a typical organic electroluminescent device and a method for manufacturing the same, and it should be understood that the present application is not limited to this structure. The light extraction material of the present application can be used for an organic electroluminescent device of any structure, and the organic electroluminescent device can be manufactured by any manufacturing method known in the art.
Synthetic examples
Synthesis example 1: synthesis of Compound A1
100mmol of 4-bromodibenzofuran, 100mmol of 2- (9, 9-dimethylfluorene) -aniline, 28.83g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) (palladium bis (dibenzylideneacetone) and 2 mol% of tri-tert-butylphosphine were added to a reaction flask. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M1 as a yellow powder. Wherein the amount of Pd (dba) added is 1 mol% of 4-bromodibenzofuran, and the amount of tri-tert-butylphosphine added is 2 mol% of 4-bromodibenzofuran.
100mmol of M1 and 500ml of dichloromethane were added to 100mmol of NBS (N-bromosuccinimide) at 0 ℃ and reacted at room temperature for 12 hours. After the reaction is finished, the solvent is evaporated, and the intermediate M2 is obtained by column chromatography separation.
100mmol of M2, 100mmol of diphenylamine, 40g of sodium tert-butoxide (300mmol), 800ml of xylene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to the reaction flask. The reaction was carried out at 130 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was carried out, water washing was carried out, the organic phase was concentrated, and the obtained solid was purified by recrystallization from xylene to obtain yellow powder a 1. Wherein the addition amount of Pd (dba) is 1mol percent of M2, and the addition amount of tri-tert-butylphosphine is 2mol percent of M2.
1H NMR(400MHz,Chloroform)7.98(s,1H),7.92–7.70(m,3H),7.54(t,J＝7.2Hz,3H),7.39(s,1H),7.37–7.29(m,3H),7.24(d,J＝6.4Hz,6H),7.07(d,J＝8.8Hz,8H),7.00(s,3H),1.69(s,6H).
Synthesis example 2: synthesis of Compound A5
100mmol of 4-bromodibenzofuran, 100mmol of 2- (9, 9-dimethylfluorene) -2- (9, 9-dimethylfluorene) amine, 40g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to a reaction flask. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M1 as a yellow powder. Wherein the amount of Pd (dba) added is 1 mol% of 4-bromodibenzofuran, and the amount of tri-tert-butylphosphine added is 2 mol% of 4-bromodibenzofuran.
100mmol of M1 and 500ml of dichloromethane were added to 100mmol of NBS at 0 ℃ and reacted at room temperature for 12 hours. After the reaction is finished, the solvent is evaporated, and the intermediate M2 is obtained by column chromatography separation.
100mmol of M2, 100mmol of diphenylamine, 40g of sodium tert-butoxide (300mmol), 800ml of xylene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to the reaction flask. The reaction was carried out at 130 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was carried out, water washing was carried out, the organic phase was concentrated, and the obtained solid was purified by recrystallization from xylene to obtain yellow powder a 5. Wherein the addition amount of Pd (dba) is 1mol percent of M2, and the addition amount of tri-tert-butylphosphine is 2mol percent of M2.
1H NMR(400MHz,Chloroform)7.94(d,J＝10.0Hz,3H),7.87(d,J＝10.0Hz,3H),7.60–7.51(m,5H),7.39(d,J＝3.0Hz,3H),7.33(d,J＝8.4Hz,3H),7.24(d,J＝6.4Hz,6H),7.07(d,J＝8.0Hz,5H),7.00(s,2H),1.69(s,12H).
Synthetic example 3: synthesis of Compound A8
Adding 100mmol of 2-bromo-4-chloro-6-fluoroaniline into 200ml of dilute hydrochloric acid, cooling to 0 ℃, adding 100mmol of sodium nitrite, keeping the temperature at 0 ℃ for 1h, adding 100mmol of cuprous iodide, naturally heating to room temperature, and reacting for 12 h. After the reaction is finished, water is added, ethyl acetate is used for extraction, and column chromatography separation is carried out to obtain an intermediate M1.
Into a reaction flask were charged 100mmol of M1, 100mmol of 2-methoxyphenylboronic acid, 40g of potassium carbonate (300mmol), 800ml of THF (tetrahydrofuran), and 200ml of water, and 1 mol% of Pd (PPh) was added3)4(tetrakis (triphenylphosphine) palladium). The reaction was carried out at 65 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, filtered, washed with water, and the resulting solid was purified by recrystallization from toluene to give M2 as a yellow powder. Wherein, Pd (PPh)3)4Was added in an amount of 1 mol% based on M1.
Cooling 100mmol of M2 and 500ml of dichloromethane to 0 ℃, adding 120mmol of boron tribromide, keeping the temperature at 0 ℃ for 1h, naturally heating to room temperature, and reacting for 12 h. After the reaction is finished, the solvent is evaporated, and the intermediate M3 is obtained by column chromatography separation.
100mmol of M3, 300mmol of potassium carbonate and 800ml of DMF (N, N-dimethylformamide) were added to a reaction flask and reacted at 100 ℃ for 12 hours. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added to precipitate a solid, and the obtained solid was purified by recrystallization from toluene to obtain M4 as a yellow powder.
100mmol of M4, 100mmol of 2- (dibenzofuran) -aniline, 40g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to the reaction flask. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M5 as a yellow powder. Wherein the addition amount of Pd (dba) is 1mol percent of M4, and the addition amount of tri-tert-butylphosphine is 2mol percent of M4.
100mmol of M5, 100mmol of 2- (9, 9-dimethylfluorene) -aniline, 40g of sodium tert-butoxide (300mmol), 800ml of xylene are added to the reaction flask, and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine are added. The reaction was carried out at 130 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was carried out, water washing was carried out, the organic phase was concentrated, and the obtained solid was purified by recrystallization from xylene to obtain yellow powder A8. Wherein the addition amount of Pd (dba) is 1mol percent of M5, and the addition amount of tri-tert-butylphosphine is 2mol percent of M5.
1H NMR(400MHz,Chloroform)8.22(s,1H),7.98(s,2H),7.88(d,J＝10.0Hz,2H),7.75–7.69(m,3H),7.55–7.43(m,8H),7.39(s,1H),7.32(dd,J＝12.0,6.4Hz,5H),7.24(d,J＝8.4Hz,4H),7.21(dd,J＝8.4,5.6Hz,2H),7.12(d,J＝8.0Hz,2H),7.00(s,2H),1.69(s,6H).
Synthetic example 4: synthesis of Compound A17
Adding 100mmol of 2-bromo-4-chloro-6-fluoroaniline into 200ml of dilute hydrochloric acid, cooling to 0 ℃, adding 100mmol of sodium nitrite, keeping the temperature at 0 ℃ for 1h, adding 100mmol of cuprous iodide, naturally heating to room temperature, and reacting for 12 h. After the reaction is finished, water is added, ethyl acetate is used for extraction, and column chromatography separation is carried out to obtain an intermediate M1.
Into a reaction flask were charged 100mmol of M1, 100mmol of 2-mercaptophenylboronic acid, 41.4g of potassium carbonate (300mmol), 800ml of THF and 200ml of water, and 1 mol% Pd (PPh) was added3)4. The reaction was carried out at 65 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, filtered, washed with water, and the resulting solid was purified by recrystallization from toluene to give M2 as a yellow powder. Wherein, Pd (PPh)3)4Was added in an amount of 1 mol% based on M1.
100mmol of M2, 300mmol of potassium carbonate and 800ml of DMF were added to a reaction flask and reacted at 100 ℃ for 12 hours. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added to precipitate a solid, and the obtained solid was purified by recrystallization from toluene to obtain M3 as a yellow powder.
100mmol of M3, 100mmol of 2- (9, 9-dimethylfluorene) -2-naphthylamine, 28.83g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to the reaction flask. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M4 as a yellow powder. Wherein the addition amount of Pd (dba) is 1mol percent of M3, and the addition amount of tri-tert-butylphosphine is 2mol percent of M3.
100mmol of M4, 100mmol of 2- (9, 9-dimethylfluorene) -aniline, 28.83g of sodium tert-butoxide (300mmol), 800ml of xylene are added to the reaction flask, and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine are added. The reaction was carried out at 130 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was carried out, water washing was carried out, the organic phase was concentrated, and the obtained solid was purified by recrystallization from xylene to obtain yellow powder a 17. Wherein the addition amount of Pd (dba) is 1mol percent of M4, and the addition amount of tri-tert-butylphosphine is 2mol percent of M4.
1H NMR(400MHz,Chloroform)8.45(s,1H),8.05–7.96(m,4H),7.85(t,J＝6.4Hz,3H),7.70(t,J＝7.2Hz,3H),7.62(s,1H),7.55(dd,J＝9.6,6.8Hz,5H),7.44(t,J＝12.0Hz,3H),7.41–7.29(m,5H),7.24(d,J＝8.4Hz,3H),7.10(d,J＝12.0Hz,3H),7.00(s,1H),1.69(s,12H).
Synthesis example 5: synthesis of Compound A15
100mmol of 4-bromodibenzofuran, 100mmol of 2- (dibenzofuran) -2- (dibenzothiophene) amine, 28.83g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to a reaction flask. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M1 as a yellow powder. Wherein the amount of Pd (dba) added is 1 mol% of 4-bromodibenzofuran, and the amount of tri-tert-butylphosphine added is 2 mol% of 4-bromodibenzofuran.
100mmol of M1 and 500ml of dichloromethane were added to 100mmol of NBS at 0 ℃ and reacted at room temperature for 12 hours. After the reaction is finished, the solvent is evaporated, and the intermediate M2 is obtained by column chromatography separation.
Into a reaction flask were charged 100mmol of M2, 100mmol of diphenylamine, 28.83g of sodium tert-butoxide (300mmol), 800ml of xylene, and 1 mol% of Pd (dba), 2 mol% of tri-tert-butylphosphine were added. The reaction was carried out at 130 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was carried out, water washing was carried out, the organic phase was concentrated, and the obtained solid was purified by recrystallization from xylene to obtain yellow powder a 15. Wherein the addition amount of Pd (dba) is 1mol percent of M2, and the addition amount of tri-tert-butylphosphine is 2mol percent of M2.
1H NMR(400MHz,Chloroform)8.45(s,1H),8.22(s,1H),7.98(s,1H),7.87(d,J＝10.0Hz,2H),7.64–7.52(m,8H),7.46(s,1H),7.39(d,J＝6.8Hz,4H),7.31-7.24(m,4H),7.14(s,1H),7.08(s,1H),7.01(d,J＝8.0Hz,6H).
Synthetic example 6: synthesis of Compound A18
Adding 100mmol of 2-bromo-4-chloro-6-fluoroaniline into 200ml of dilute hydrochloric acid, cooling to 0 ℃, adding 100mmol of sodium nitrite, keeping the temperature at 0 ℃ for 1h, adding 100mmol of cuprous iodide, naturally heating to room temperature, and reacting for 12 h. After the reaction is finished, water is added, ethyl acetate is used for extraction, and column chromatography separation is carried out to obtain an intermediate M1.
Into a reaction flask were charged 100mmol of M1, 100mmol of 2-methoxyphenylboronic acid, 41.4g of potassium carbonate (300mmol), 800ml of THF (tetrahydrofuran), and 200ml of water, and 1 mol% of Pd (PPh) was added3)4(tetrakis (triphenylphosphine) palladium). The reaction was carried out at 65 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, filtered, washed with water, and the resulting solid was purified by recrystallization from toluene to give M2 as a yellow powder. Wherein, Pd (PPh)3)4Was added in an amount of 1 mol% based on M1.
Cooling 100mmol of M2 and 500ml of dichloromethane to 0 ℃, adding 120mmol of boron tribromide, keeping the temperature for 1h, naturally heating to room temperature, and reacting for 12 h. After the reaction is finished, the solvent is evaporated, and the intermediate M3 is obtained by column chromatography separation.
100mmol of M3, 300mmol of potassium carbonate and 800ml of DMF (N, N-dimethylformamide) were added to a reaction flask and reacted at 100 ℃ for 12 hours. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added to precipitate a solid, and the obtained solid was purified by recrystallization from toluene to obtain M4 as a yellow powder.
100mmol of M4, 100mmol of 3- (N-phenylcarbazole) -aniline, 28.83g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine are added to the reaction vessel. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M5 as a yellow powder. Wherein the addition amount of Pd (dba) is 1mol percent of M4, and the addition amount of tri-tert-butylphosphine is 2mol percent of M4.
100mmol of M5, 100mmol of 2- (9, 9-dimethylfluorene) -aniline, 28.83g of sodium tert-butoxide (300mmol), 800ml of xylene are added to the reaction flask, and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine are added. The reaction was carried out at 130 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was carried out, water washing was carried out, the organic phase was concentrated, and the obtained solid was purified by recrystallization from xylene to obtain yellow powder a 18. Wherein the addition amount of Pd (dba) is 1mol percent of M5, and the addition amount of tri-tert-butylphosphine is 2mol percent of M5.
1H NMR(400MHz,Chloroform)8.55(s,1H),7.88(d,J＝10.0Hz,3H),7.78–7.47(m,10H),7.34(dt,J＝12.4,3.3Hz,7H),7.24(d,J＝6.4Hz,6H),7.16(s,1H),7.10(d,J＝12.0Hz,6H),7.00(s,1H),1.69(s,12H).
Synthetic example 7: synthesis of Compound A14
Into a reaction flask were charged 100mmol of 2, 6-dibromopyridine, 100mmol of methyl 2-iodobenzoate, 41.4g of potassium carbonate (300mmol), 800ml of THF (tetrahydrofuran), and 200ml of water, and 1 mol% of Pd (PPh3)4 (tetrakis (triphenylphosphine) palladium) was added. The reaction was carried out at 65 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, filtered, washed with water, and the resulting solid was purified by recrystallization from toluene to give M1 as a yellow powder. Wherein the amount of Pd (PPh3)4 added was 1 mol% based on the amount of 2, 6-dibromopyridine.
Cooling 100mmol of M1 and 500ml of THF to 0 ℃, adding 220mmol of methyl magnesium bromide, keeping the temperature low for 1h, naturally heating to room temperature, and reacting for 12 h. After the reaction is finished, the solvent is evaporated, and the intermediate M2 is obtained by column chromatography separation.
100mmol of M2 and 300mmol of trifluoromethanesulfonic anhydride were added to a reaction flask and reacted at 100 ℃ for 12 hours. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added to precipitate a solid, and the obtained solid was purified by recrystallization from toluene to obtain M3 as a yellow powder.
100mmol of M3, 100mmol of 2-benzidine, 28.83g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to the reaction flask. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M4 as a yellow powder. Wherein the addition amount of Pd (dba) is 1mol percent of M3, and the addition amount of tri-tert-butylphosphine is 2mol percent of M3.
100mmol of 4-bromodibenzofuran, 100mmol of M4, 28.83g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to the reaction flask. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M5 as a yellow powder. Wherein the amount of Pd (dba) added is 1 mol% of 4-bromodibenzofuran, and the amount of tri-tert-butylphosphine added is 2 mol% of 4-bromodibenzofuran.
100mmol of M5 and 500ml of dichloromethane were added to 100mmol of NBS at 0 ℃ and reacted at room temperature for 12 hours. After the reaction is finished, the solvent is evaporated, and the intermediate M6 is obtained by column chromatography separation.
100mmol of M6, 100mmol of 2- (9, 9-dimethylfluorene) -aniline, 28.83g of sodium tert-butoxide (300mmol), 800ml of xylene are added to the reaction flask, and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine are added. The reaction was carried out at 130 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was carried out, water washing was carried out, the organic phase was concentrated, and the obtained solid was purified by recrystallization from xylene to obtain yellow powder a 14. Wherein the addition amount of Pd (dba) is 1mol percent of M6, and the addition amount of tri-tert-butylphosphine is 2mol percent of M6.
1H NMR(400MHz,Chloroform)8.10(s,1H),8.00(d,J＝12.0Hz,4H),7.92–7.69(m,6H),7.61(s,1H),7.55(d,J＝9.2Hz,3H),7.37(ddd,J＝14.0,8.8,6.4Hz,4H),7.25(t,J＝7.6Hz,3H),7.11(d,J＝10.0Hz,3H),6.99(d,J＝10.0Hz,4H),6.72(d,J＝12.0Hz,4H),1.69(s,12H).
Synthesis example 8: synthesis of Compound A27
100mmol of N-phenyl-4-bromocarbazole, 100mmol of phenyl-4-benzidine, 28.83g of sodium tert-butoxide (300mmol), 800ml of toluene and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine were added to a reaction flask. The reaction was carried out at 100 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was performed, water washing was performed, the organic phase was concentrated, and the obtained solid was purified by recrystallization from toluene to obtain M1 as a yellow powder. Wherein the amount of Pd (dba) added is 1 mol% of 4-bromodibenzofuran, and the amount of tri-tert-butylphosphine added is 2 mol% of 4-bromodibenzofuran.
100mmol of M1 and 500ml of dichloromethane were added to 100mmol of NBS at 0 ℃ and reacted at room temperature for 12 hours. After the reaction is finished, the solvent is evaporated, and the intermediate M2 is obtained by column chromatography separation.
100mmol of M2, 100mmol of 2- (9, 9-dimethylfluorene) -aniline, 28.83g of sodium tert-butoxide (300mmol), 800ml of xylene are added to the reaction flask, and 1 mol% of Pd (dba) and 2 mol% of tri-tert-butylphosphine are added. The reaction was carried out at 130 ℃ for 12 h. After the reaction was completed, the reaction was stopped, and the reaction mixture was cooled to room temperature, water was added, liquid separation was carried out, water washing was carried out, the organic phase was concentrated, and the obtained solid was purified by recrystallization from xylene to obtain yellow powder a 27. Wherein the addition amount of Pd (dba) is 1mol percent of M2, and the addition amount of tri-tert-butylphosphine is 2mol percent of M2.
1H NMR(400MHz,Chloroform)8.55(s,1H),7.88(d,J＝10.0Hz,4H),7.75(s,1H),7.62(s,1H),7.52–7.39(m,10H),7.36(d,J＝13.6Hz,4H),7.24(d,J＝8.4Hz,6H),7.12(dd,J＝12.8,7.2Hz,6H),7.00-6.91(m,4H),1.69(s,6H).
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