Organic compound containing cyano group, OLED (Organic Light Emitting Diode) device with compound and organic light emitting device

Abstract

The invention relates to the technical field of preparation of organic photoelectric materials, in particular to a cyano-containing organic compound, an OLED device with the compound and an organic light-emitting device with the compound. The organic compound provided by the invention has good thermal stability, and a device prepared from the organic compound has excellent device performance. Furthermore, the organic compound provided by the invention is combined with a compound with a fused aryl structure to be used in a device, so that the migration efficiency of holes and electrons can be effectively improved, the device or element can show lower working voltage, higher BI luminous efficiency and longer service life, and the effect is superior to that of an existing common OLED (Organic Light Emitting Diode) device. And the method has a good industrialization prospect.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of organic photoelectric materials, and in particular to an organic compound containing a cyano group, an OLED device having the compound, and an organic light-emitting device. Background Art

[0002] With the development of multimedia technology and the improvement of information requirements, the requirements for panel display performance are getting higher and higher. Organic light-emitting diodes (OLEDs), also known as organic electroluminescent devices, are a technology that causes organic materials to emit light through carrier injection and recombination under the action of an electric field. It can convert electrical energy into light energy through organic light-emitting materials. Generally, the organic material layer has a multilayer structure composed of different materials to improve the efficiency and stability of the organic light-emitting device. For example, the organic material layer can include a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer.

[0003] Carrier transport materials are currently a hot topic of research for experts and scholars from all walks of life. By efficiently transporting electrons or holes to the light-emitting area, electrons and holes are more easily recombined, thereby improving the performance of the material. However, existing electron transport materials are still insufficient in improving device performance. Even if a variety of materials are used in combination, display technology still has problems such as high driving voltage and short display life, which seriously affects the further practical application of this technology.

[0004] Therefore, it is necessary to continue to find suitable OLED optoelectronic functional materials and strive to develop organic light-emitting devices with low voltage drive, high brightness and long life. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide an organic compound containing a cyano group, an OLED having the compound, and a display or lighting device, and to provide a new type of material to improve the stability and life of the device.

[0006] The technical solution of the present invention is as follows:

[0007] According to one or more embodiments, the present invention provides an organic electroluminescent device, comprising:

[0008] substrate layer;

[0009] a first electrode, the first electrode being on the substrate;

[0010] An organic light-emitting functional layer, the organic light-emitting functional layer is on the first electrode;

[0011] A second electrode, the second electrode being on the organic light-emitting functional layer;

[0012] The organic light-emitting functional layer includes a first organic material layer; the first organic material layer includes a structure shown in the following formula I:

[0013]

[0014] In Formula I, X 1 -X 8 Each independently selected from CR a or N atoms, X 1 -X 8 are not simultaneously selected from N atoms, and X 1 -X 8 At least one is a N atom; Ra, Q 3 Each is independently selected from hydrogen, C6-C30 aryl; L 2 Selected from C6-C30 aryl; L 1 is selected from a single bond or a C6-C30 aryl group; Q 1 independently selected from cyano-substituted C6-C30 aryl, Q 2 Independently selected from hydrogen and cyano-substituted C6-C30 aryl.

[0015] The first organic material layer is an electron transport layer or an electron injection layer.

[0016] Preferably, in the formula I, X 1 -X 8 Any one selected from N atom; R a , Q 3 Each is independently selected from hydrogen or phenyl.

[0017] Preferably, in the formula I, L 2 Selected from phenyl, naphthyl, biphenyl and terphenyl.

[0018] Preferably, in the formula I, L 1 is any one of a single bond, a phenyl group, and a biphenyl group; Q 1 independently selected from cyanobenzene, cyano-substituted biphenyl, Q 2 Any one independently selected from hydrogen, cyanobenzene, and cyano-substituted biphenyl.

[0019] The present invention also provides an organic electroluminescent device, the organic electroluminescent device comprising:

[0020] substrate layer;

[0021] a first electrode, the first electrode being on the substrate;

[0022] An organic light-emitting functional layer, the organic light-emitting functional layer is on the first electrode;

[0023] A second electrode, the second electrode being on the organic light-emitting functional layer;

[0024] The organic light-emitting functional layer includes a first organic material layer; the first organic material layer includes a structure shown in the following formula I:

[0025]

[0026] In Formula I, X 1 -X 8 Each independently selected from CR a or N atoms, X 1 -X 8 are not simultaneously selected from N atoms, and X 1 -X 8 At least one is a N atom; Ra, Q 3 Each is independently selected from hydrogen, C6-C30 aryl; L 2 is selected from cyano-substituted C6-C30 aryl groups; L 1 is selected from a single bond or a C6-C30 aryl group; Q 1 , Q 2 Each is independently selected from hydrogen, cyano-substituted or unsubstituted C6-C30 aryl.

[0027] According to one or more embodiments, the present invention provides an organic electroluminescent device, comprising:

[0028] substrate layer;

[0029] a first electrode, the first electrode being on the substrate;

[0030] An organic light-emitting functional layer, the organic light-emitting functional layer is on the first electrode;

[0031] A second electrode, the second electrode being on the organic light-emitting functional layer;

[0032] The organic light-emitting functional layer includes a first organic material layer; the first organic material layer is selected from any one of the following chemical structures, where "CN" represents a cyano group:

[0033]

[0034]

[0035]

[0036]

[0037]

[0038] The organic light-emitting functional layer further includes a second organic material layer, and the second organic material layer includes the following compound having a structure shown in Formula II:

[0039]

[0040] In Formula II, R 1 , R 2 Each is independently selected from hydrogen, C1-C20 alkyl, C6-C30 aryl; R 3 is selected from substituted or unsubstituted C6-C30 aryl, C4-C36 heteroaryl, when containing substitution, the substitution is mono-substitution, di-substitution to the maximum possible number of substitutions, and the substituent is C1-C24 alkyl; X is selected from C(CH 3 ) 2 or an O atom; Ring A and Ring B are each independently selected from indenyl substituted with no ring, benzofuranyl or methyl, and Ring A and Ring B do not exist at the same time.

[0041] Preferably, in Formula II, R 1 , R 2 Each is independently selected from methyl or phenyl; R 3 Selected from phenyl, biphenyl, terphenyl, methyl-substituted biphenyl, triphenylene, dibenzofuranyl, dimethylfluorenyl.

[0042] Preferably, in Formula II, when X is selected from C(CH 3 ) 2 When X is selected from an O atom, either ring A or ring B is selected from a benzofuranyl group or both are absent; when X is selected from an O atom, either ring A or ring B is selected from an indenyl group substituted with a methyl group or both are absent.

[0043] Preferably, the second organic material layer is selected from any one of the following chemical structures:

[0044]

[0045]

[0046]

[0047]

[0048]

[0049]

[0050]

[0051] The organic electroluminescent device of the present invention can be used in an OLED lighting or display device.

[0052] The present invention also provides a display or lighting device, which comprises one or more of the organic electroluminescent devices described above.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] The organic compound provided by the present invention has a stronger electron injection ability by utilizing a nitrogen-containing spirofluorene group, a cyano group, and an aryl group combination, so that the molecule as a whole exhibits good electron migration performance. Therefore, when the compound of the present invention is used in an organic electroluminescent device, the luminous efficiency of the device can be effectively improved, thereby ensuring that the device obtains an excellent effect of a low starting voltage and prolonging the life of the device. In addition, the preparation process of the compound of the present invention is simple and easy, the raw materials are easily available, and it is suitable for mass production and amplification. DETAILED DESCRIPTION

[0055] The following will be clearly and completely described in conjunction with the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0056] The aryl group of the present invention refers to a general term for a monovalent group after removing a hydrogen atom from the aromatic core carbon of an aromatic hydrocarbon molecule, which can be a monocyclic aryl group or a condensed ring aryl group. The aryl group can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, and more preferably an aryl group having 6 to 12 carbon atoms. Examples may include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthyl, anthracenyl, phenanthrenyl or pyrenyl, but are not limited thereto. Aryl or aromatic group-as used herein, non-condensed and condensed systems are considered. The aryl group can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, and more preferably an aryl group having 6 to 12 carbon atoms. Examples of the aryl group include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenanthrene, phenanthrene, fluorene, pyrene, perylene and azulene, with preference given to phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. Examples of non-fused aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenyl, 4"-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl and m-quaterphenyl.

[0057] The heteroaryl group of the present invention refers to a general term for a group obtained by replacing one or more aromatic carbon atoms in an aromatic group with a heteroatom, wherein the heteroatom includes but is not limited to oxygen, sulfur, silicon or nitrogen atoms, and the heteroaryl group may be a monocyclic heteroaryl group or a condensed ring heteroaryl group, and may be a heteroaryl group having 6 to 30 carbon atoms, preferably a heteroaryl group having 6 to 20 carbon atoms. Examples may include pyridyl, pyrrolyl, pyridyl, thienyl, furanyl, indolyl, quinolyl, isoquinolyl, benzothienyl, benzofuranyl, dibenzofuranyl, dibenzothienyl, carbazolyl, etc., but are not limited thereto.

[0058] The alkyl group of the present invention includes straight chain and branched chain alkyl groups. It can be an alkyl group having 1 to 24 carbon atoms, and preferably an alkyl group having 1 to 20 carbon atoms, including methyl, ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl, 2,2-dimethylpropyl, etc. In addition, the alkyl group can be optionally substituted.

[0059] Throughout the specification, unless explicitly described to the contrary, "comprising" any component will be understood to imply the inclusion of other elements, rather than excluding any other elements. In addition, it should be understood that throughout the specification, when an element such as a layer, film, region or substrate is referred to as being "on" or "above" another element, it can be "directly on" another element, or there may be intervening elements. In addition, "on..." or "above..." means being located above the target portion, and does not necessarily mean being located above according to the direction of gravity.

[0060] One object of the present invention is to provide an organic electroluminescent device, which includes: a substrate layer; a first electrode, which is on the substrate; an organic light-emitting functional layer, which is on the first electrode; a second electrode, which is on the organic light-emitting functional layer; the organic light-emitting functional layer includes a first organic material layer, and the first organic material layer includes an organic compound having an azaspirofluorene group and a cyano group.

[0061] In a preferred embodiment of the present invention, an OLED is provided, which includes a substrate, an anode, a cathode, and an organic light-emitting functional layer, wherein the organic light-emitting functional layer may include a light-emitting layer, a hole transport layer, a hole injection layer, an electron transport layer, an electron injection layer, etc., or may only include a light-emitting layer and one or more other layers; wherein the hole transport layer includes one or more components of an organic compound having a structure shown in Formula II; and the electron transport layer includes one or more compounds having a structure shown in Formula I above. Optionally, there is a covering layer, a protective layer and / or an encapsulation layer on the organic light-emitting functional layer.

[0062] The substrate of the present invention can be any substrate used in a typical organic light-emitting device. It can be a glass or transparent plastic substrate, or a substrate of an opaque material such as silicon or stainless steel, or a flexible PI film. Different substrates have different mechanical strengths, thermal stability, transparency, surface smoothness, and waterproofness. Depending on the properties of the substrate, the use direction is different.

[0063] As materials for the hole injection layer, the electron injection layer, and the light-emitting layer, any material can be selected from known related materials used for OLED devices.

[0064] As a guest material capable of producing blue fluorescence, green fluorescence and blue-green fluorescence, it not only needs to have an extremely high fluorescence quantum luminescence efficiency, but also needs to have an appropriate energy level to effectively absorb the excitation energy of the host material to emit light.

[0065] The present invention is described in detail below in conjunction with specific examples. Synthesis Examples All raw materials and solvents are commercially available unless otherwise specified, and the solvents are used directly without further treatment.

[0066] Example

[0067] Example 1: Synthesis of Compound 021

[0068] Synthesis route:

[0069]

[0070] Synthesis method:

[0071] Add 021-1 (10 mmol), 021-2 (10 mmol) and 10 mL of dioxane: water (4:1) to the reaction bottle, mix, put into a 50 mL flask, reflux for 24 hours. Cool to room temperature, then slowly add saturated MgSO 4 The solution was extracted with aqueous solution and ethyl acetate three times, and then the organic layer was freed from the solvent by a rotary evaporator and purified by column chromatography to obtain the final product 021.

[0072] The structure of the test target product 021: LC-MS (m / z) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 649.23, and the test value was 649.69.

[0073] Example 2: Synthesis of Compound 012

[0074] With reference to the synthesis steps and reaction conditions of Example 1, compound 012 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z): the theoretical value was 725.26 and the test value was 725.70.

[0075] Example 3: Synthesis of Compound 047

[0076] Referring to the synthesis steps and reaction conditions of Example 1, compound 047 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 725.26 and the test value was 725.84.

[0077] Example 4: Synthesis of Compound 062

[0078] Referring to the synthesis steps and reaction conditions of Example 1, compound 062 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 801.29 and the test value was 801.87.

[0079] Example 5: Synthesis of Compound 069

[0080] Referring to the synthesis steps and reaction conditions of Example 1, compound 069 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 725.26 and the test value was 725.84.

[0081] Example 6: Synthesis of Compound 1-001

[0082] Synthesis route:

[0083]

[0084] 1) Add 1-001-1 (10 mmol), 1-001-2 (25 mmol), sodium tert-butoxide (10 mmol), and 200 mL of toluene to the reaction flask. After nitrogen replacement, add pd 2 (dba) 3 (5×10 -2 mmoL), Sphos(5×10 -2 mmoL), heated to 100-120°C, refluxed for 6 hours, and then stopped. Cooled to 30-40°C, added 200mL of water, and separated into layers. After washing twice with water, concentrated toluene, added 100mL of n-heptane, and slurried. The intermediate product 1-001-3 was obtained.

[0085] 2) Add 1-001-3 (10 mmol), 1-001-4 (25 mmol), sodium tert-butoxide (10 mmol), and 200 mL of toluene to the reaction flask. After nitrogen replacement, add pd 2 (dba) 3 (5×10 -2 mmoL)、Sphos(5×10 -2mmoL), heated to 100-120°C, refluxed for 6 hours, and stopped the reaction. Cooled to 30-40°C, added 200mL of water, and separated into layers. After washing with water twice, concentrated toluene, added 100mL of n-heptane, and slurried. The intermediate product 1-001 was obtained.

[0086] The structure of the test target product 1-001 was analyzed by liquid chromatography-mass spectrometry and obtained LC-MS (m / z) (Μ+): the theoretical value was 567.26 and the test value was 567.58.

[0087] Example 7: Synthesis of Compound 1-008

[0088] Referring to the synthesis steps and reaction conditions of Example 6, compound 1-008 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 705.30 and the test value was 705.88.

[0089] Example 8: Synthesis of Compound 1-016

[0090] Compound 1-016 was synthesized by referring to the synthesis steps and reaction conditions of Example 6. LC-MS (m / z) (M+) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 767.32, and the test value was 767.94.

[0091] Example 9: Synthesis of Compound 1-039

[0092] Referring to the synthesis steps and reaction conditions of Example 6, compound 1-039 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 705.30 and the test value was 705.92.

[0093] Example 10: Synthesis of Compound 1-042

[0094] Referring to the synthesis steps and reaction conditions of Example 6, compound 1-042 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 767.32 and the test value was 767.96.

[0095] Example 11: Synthesis of Compound 1-058

[0096] Referring to the synthesis steps and reaction conditions of Example 6, compound 1-058 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 643.29 and the test value was 643.81.

[0097] Example 12: Synthesis of Compound 1-094

[0098] Referring to the synthesis steps and reaction conditions of Example 6, compound 1-094 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 603.26 and the test value was 603.78.

[0099] Example 13: Synthesis of Compound 1-097

[0100] Referring to the synthesis steps and reaction conditions of Example 6, compound 1-097 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 627.29 and the test value was 627.85.

[0101] Example 14: Synthesis of Compound 1-100

[0102] Referring to the synthesis steps and reaction conditions of Example 6, compound 1-100 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 629.31 and the test value was 629.83.

[0103] Example 15: Synthesis of Compound 1-104

[0104] Referring to the synthesis steps and reaction conditions of Example 6, compound 1-104 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 719.32 and the test value was 719.90.

[0105] Several examples of the application of the organic compound of the present invention in OLED devices are listed below to further illustrate the beneficial effects of the compound of the present invention. The materials used in the examples are purchased from commercial sources or synthesized by the user.

[0106] Fabrication of OLED devices:

[0107] As a reference preparation method for a device embodiment, the present invention evaporates 50-500nm ITO / Ag / ITO on an alkali-free glass substrate as an anode, evaporates a hole injection layer (5nm-20nm), a hole transport layer (50-150nm), a light-emitting auxiliary layer (5-120nm), a light-emitting layer (20-50nm), a hole blocking layer (5-20nm), an electron transport layer (20-80nm), and an electron injection layer (1-10nm) on the anode, and then co-evaporates Mg and Ag (weight ratio 1:9, 10-50nm) to make a semi-transparent cathode, and then evaporates a cover layer compound. Finally, the light-emitting device is encapsulated using an epoxy resin adhesive in a nitrogen atmosphere.

[0108] In a preferred embodiment, the structure of the OLED device provided by the present invention is as follows: first, an alkali-free glass substrate is washed with isopropyl alcohol for 15 minutes using an ultrasonic cleaner, and then a UV ozone cleaning treatment is performed in air for 30 minutes. The treated substrate is subjected to vacuum evaporation to deposit ITO / Ag / ITO 100nm as an anode, and then a hole injection layer (compound 1-001: PD, 10nm, 2%), a hole transport layer (compound 1-001, 130nm), a light-emitting auxiliary layer (BP, 5nm), a blue light-emitting layer (host material: doping material = BH: BD (weight ratio 98:2, 30nm)), a hole blocking layer (HBL, 5nm), an electron transport layer (compound 012: Liq = 1:1, 30nm), and an electron injection layer (Yb, 1nm) are sequentially stacked and evaporated, and then Mg and Ag (weight ratio 1:9, 14nm) are co-evaporated to make a semi-transparent cathode, and then compound CPL (65nm) is evaporated as a covering layer. Finally, the light emitting device is encapsulated with epoxy resin adhesive in a nitrogen atmosphere, which is recorded as Application Example 1. The molecular structure formula of the relevant material is as follows (particularly preferably selected from the following structure, but it does not mean that the present invention is limited to the following structure):

[0109] The molecular structure formula of the relevant materials is shown below:

[0110]

[0111] The methods provided in the above-mentioned application example 1 were used to prepare application examples 2 to 15 and comparative example 1, the only difference being that the compounds listed in Table 1 were used to replace the compound 003 in application example 1. The structures of the relevant replacement materials used in comparative example 1 are as follows:

[0112] Performance evaluation of OLED devices:

[0113] The current of the OLED device at different voltages was tested using a Keithley 2365A digital nanovoltmeter, and the current was then divided by the luminous area to obtain the current density of the OLED device at different voltages. The brightness and radiant energy flux density of the OLED device at different voltages were tested using a Konicaminolta CS-2000 spectroradiometer. Based on the current density and brightness of the OLED device at different voltages, the current density (10 mA / cm 2 ) working voltage Volt and current efficiency (cd / A), BI = E / CIEy refers to the Blue Index in blue light, which is also a parameter for measuring the luminous efficiency of blue light. E refers to the current efficiency, and CIEy refers to the vertical coordinate color point obtained by bringing the wavelength of the device's luminous half-peak width into the CIE1930 software. The test data is shown in Table 1.

[0114] Table 1. ET material application examples and electronic luminescence characteristics

[0115]

[0116]

[0117] As can be seen from Table 1, compared with Comparative Example 1, at low current density, Application Examples 1 to 5 have higher luminous efficiency, and the electron transport material of the present invention has stronger electron injection, can achieve a more obvious display effect at the initial brightness, and the user experience is better; and in the stable state of the general 10 current density, it has a lower operating voltage, higher BI luminous efficiency and longer service life. The improvement in the performance of each application example is based on the good coordination ability of the organic compound material of the present invention with the azaspirofluorene group and the cyano group in the triazine group main body.

[0118] In order to further verify the excellent performance of the organic compound provided by the present invention, Application Examples 6 to 15 and Comparative Examples 2-3 were prepared by referring to the method provided in Application Example 1 above; the only difference is that the compounds listed in Table 2 were used to replace the HT and ET materials in Application Example 1. The structures of the new materials involved in the comparative examples in Table 2 are as follows:

[0119] Table 2. Devices and electronic luminescence properties of combined materials

[0120]

[0121]

[0122] It can be seen from Table 2 that, compared with Comparative Examples 2-3, Application Examples 6 to 15 have better operating voltage, higher BI luminous efficiency and longer service life. It can be seen that the hole transport material and the electron transport material in the present invention have better compatibility, which can make the mobility of holes and electrons inside the device better, thereby significantly improving the luminous efficiency and life of the device.

[0123] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An organic electroluminescent device, characterized in that: The organic electroluminescent device comprises: substrate layer; a first electrode, the first electrode being on the substrate; An organic light-emitting functional layer, the organic light-emitting functional layer is on the first electrode; A second electrode, the second electrode being on the organic light-emitting functional layer; The organic light-emitting functional layer includes a first organic material layer; the first organic material layer includes a structure shown in the following formula I: In Formula I, X1-X8 are each independently selected from CR a Or N atom, X1-X8 are not selected from N atoms at the same time, and at least one of X1-X8 is a N atom; Ra and Q3 are each independently selected from hydrogen and C6-C30 aryl; L2 is selected from C6-C30 aryl; L1 is selected from a single bond or C6-C30 aryl; Q1 is independently selected from C6-C30 aryl substituted with cyano, and Q2 is independently selected from hydrogen and C6-C30 aryl substituted with cyano.

2. An organic electroluminescent device according to claim 1, characterized in that: In the formula I, any one of X1-X8 is selected from N atom; R a , Q3 are each independently selected from hydrogen or phenyl.

3. The organic electroluminescent device according to claim 1, characterized in that: In the formula I, L2 is selected from phenyl, naphthyl, biphenyl and terphenyl.

4. The organic electroluminescent device according to claim 1, characterized in that: In the formula I, L1 is any one of a single bond, a phenyl group, and a biphenyl group; Q1 is independently selected from cyanobenzene and a cyano-substituted biphenyl group; Q2 is independently selected from any one of hydrogen, cyanobenzene, and a cyano-substituted biphenyl group.

5. An organic electroluminescent device, characterized in that: The organic electroluminescent device comprises: substrate layer; a first electrode, the first electrode being on the substrate; An organic light-emitting functional layer, the organic light-emitting functional layer is on the first electrode; A second electrode, the second electrode being on the organic light-emitting functional layer; The organic light-emitting functional layer includes a first organic material layer; the first organic material layer includes a structure shown in the following formula I: In Formula I, X1-X8 are each independently selected from CR a or N atom, X1-X8 are not selected from N atoms at the same time, and at least one of X1-X8 is a N atom; Ra and Q3 are each independently selected from hydrogen and C6-C30 aryl; L2 is selected from C6-C30 aryl substituted with cyano; L1 is selected from a single bond or C6-C30 aryl; Q1 and Q2 are each independently selected from hydrogen, cyano substituted or unsubstituted C6-C30 aryl.

6. An organic electroluminescent device, characterized in that: The organic electroluminescent device comprises: substrate layer; a first electrode, the first electrode being on the substrate; An organic light-emitting functional layer, the organic light-emitting functional layer is on the first electrode; A second electrode, the second electrode being on the organic light-emitting functional layer; The organic light-emitting functional layer includes a first organic material layer; the first organic material layer includes any one of the following chemical structures, where "CN" represents a cyano group:

7. The organic electroluminescent device according to any one of claims 1 to 6, characterized in that: The organic light-emitting functional layer further comprises a second organic material layer, and the second organic material layer comprises a compound having a structure shown in the following formula II: In formula II, R1 and R2 are each independently selected from hydrogen, C1-C20 alkyl, C6-C30 aryl; R3 is selected from substituted or unsubstituted C6-C30 aryl, C4-C36 heteroaryl. When there is substitution, the substitution is mono-substitution, di-substitution to the maximum possible number of substitutions, and the substituent is C1-C24 alkyl; X is selected from C(CH3)2 or O atom; Ring A and Ring B are each independently selected from indenyl substituted with non-existent, benzofuranyl or methyl, and Ring A and Ring B do not exist at the same time.

8. The organic electroluminescent device according to claim 7, characterized in that: In the formula II, R1 and R2 are each independently selected from methyl or phenyl; R3 is selected from phenyl, biphenyl, terphenyl, methyl-substituted biphenyl, triphenylene, dibenzofuranyl, and dimethylfluorenyl.

9. The organic electroluminescent device according to claim 7, characterized in that: In the formula II, when X is selected from C(CH3)2, ring A and ring B are selected from benzofuranyl or both are absent; when X is selected from O atom, ring A and ring B are selected from methyl-substituted indenyl or both are absent.

10. The organic electroluminescent device according to claim 7, characterized in that: The compound of the structure shown in formula II is selected from any one of the following chemical structures:

11. Use of the organic electroluminescent device according to any one of claims 1 to 10 in a display or lighting device.

12. A display or lighting device, characterized in that: The device comprises the organic electroluminescent device according to any one of claims 1 to 10.

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