Organic light-emitting device, display screen and electronic equipment

Abstract

The invention discloses an organic electroluminescent device, a display screen and electronic equipment, and relates to the technical field of organic electroluminescence. The organic electroluminescent device comprises an anode layer, a cathode layer and an organic thin film layer located between the anode layer and the cathode layer, the mass ratio of an aryl phosphine spiro bipolar compound to Ir (ppy) 3 in the organic thin film layer is any one of 6: 4-9.9: 0.1, the aryl phosphine spiro bipolar compound comprises a phosphine oxide group, at least two spiro structures and substituent groups X, E, R1, R2, R3, R4, R5 and R6, the turn-on voltage of the organic light-emitting device is any one value from 4V to 5V, and the current efficiency of the organic light-emitting device is any one value from 25cd / A to 30cd / A.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of organic electroluminescence, in particular to an organic electroluminescence device, a display screen and an electronic device. BACKGROUND

[0002] Organic electronic devices such as organic light-emitting diodes (OLED), organic photovoltaics (OPV) and organic field-effect transistors (OFET) have become a research hotspot in the field of display and energy due to their lightweight, flexibility and solution processability. In OLED devices, the host material as a key component of the light-emitting layer, plays a core role in transporting carriers (electrons or holes), limiting exciton diffusion and dispersing light-emitting guest molecules.

[0003] The CBP, TCTA and mCP in the conventional host material are commonly used as the host material of the organic electroluminescence device in the art, but the conventional host material often has limitations, for example, the electron mobility of most aromatic amine host materials is relatively low, i.e. usually less than 10 -4 cm 2 / V·s), resulting in an increase in the driving voltage and a decrease in the efficiency of the organic electroluminescence device. In addition, the glass transition temperature of the host material CBP is relatively low, usually less than 100℃, and crystallization or phase separation is likely to occur in the long-term operation or high-temperature process of the organic electroluminescence device, thereby reducing the service life of the organic electroluminescence device.

[0004] In the prior art, the high polarity of the phosphine oxide group can significantly improve the electron transport capacity of the material, and the LUMO level is easy to match with the electron transport layer, thereby reducing the electron injection barrier. By modifying the benzene ring substituent, the HOMO / LUMO energy level, carrier mobility and film morphology can be accurately controlled. However, the strong electron-withdrawing property of the phosphine oxide group may result in weak hole transport capacity, carrier imbalance, and a decrease in the number of excitons formed, thereby reducing the light-emitting efficiency of the OLED device. SUMMARY

[0005] One object of the first aspect of the present application is to provide an organic electroluminescence device, which solves the technical problem of electron / hole transport imbalance and poor photoelectric performance in the organic electroluminescence device in the prior art.

[0006] Another object of the first aspect of the present application is to further improve the carrier recombination efficiency and reduce the carrier imbalance.

[0007] An object of the second aspect of the present application is to provide a display screen comprising the above-mentioned organic electroluminescence device.

[0008] A third aspect of the present invention is to provide an electronic device comprising the above display screen.

[0009] According to the purpose of the first aspect of the present invention, the present invention provides a use of an arylphosphine spiro bipolar compound in an organic electroluminescent device, wherein the organic electroluminescent device comprises an anode layer, a cathode layer, and an organic thin film layer located between the anode layer and the cathode layer, wherein the mass ratio of the arylphosphine spiro bipolar compound to Ir(ppy)3 in the organic thin film layer is any value ranging from 6:4 to 9.9:0.1, and the arylphosphine spiro bipolar compound comprises a phosphineoxy group, at least two spiro structures, and substituent groups X, E, R1, R2, R3, R4, R5, and R6. The lighting voltage of the organic electroluminescent device is any value ranging from 4V to 5V, and the current efficiency is any value ranging from 25cd / A to 30cd / A. The arylphosphine spiro bipolar compound has a structure as shown in Formula A, Formula B, or Formula C:

[0010]

[0011] The substituent group X is any one of O and S, the substituent group E is any one of C, O and S, and the substituent groups R1, R2, R3, R4, R5 and R6 are each independently selected from any one of hydrogen, deuterium, halogen, electron-withdrawing group and electron-donating group.

[0012] Optionally, when the substituent group R1, R2, R3, R4, R5 or R6 is an electron-withdrawing group or an electron-donating group, the substituent group R1, R2, R3, R4, R5 or R6 is independently selected from any one of an alkyl group, an aryl group or an aromatic amine.

[0013] Optionally, when the substituent group R1, R2, R3, R4, R5 or R6 is an alkyl group, the substituent group R1, R2, R3, R4, R5 or R6 is independently selected from a substituted or unsubstituted saturated alkyl group or an unsaturated alkyl group having 1 to 30 carbon atoms.

[0014] Optionally, when the substituent group R1, R2, R3, R4, R5 or R6 is an aromatic group, the substituent group R1, R2, R3, R4, R5 or R6 is independently selected from substituted or unsubstituted phenyl and aromatic heterocyclic structures.

[0015] Optionally, when the substituent group R1, R2, R3, R4, R5 or R6 is an aromatic amine, the substituent group R1, R2, R3, R4, R5 or R6 is independently selected from substituted or unsubstituted aromatic amine structures, and the aromatic amine structure includes but is not limited to the following structures:

[0016]

[0017]

[0018] wherein Z is any one of O, S or Se, Y1 and Y2 are each independently selected from any one of hydrogen, deuterium, halogen, cycloalkyl, alkoxy, siloxane group or substituted or unsubstituted saturated or unsaturated alkyl group with carbon number of 1-12.

[0019] Optionally, the aryl phosphine spirocyclic bipolar compound is any one of the following compounds:

[0020]

[0021]

[0022] Optionally, the organic thin film layer further comprises a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer arranged in sequence from the anode layer upwards.

[0023] According to the purpose of the second aspect of the present application, the present application further provides a display screen comprising the above-mentioned organic electroluminescent device.

[0024] According to the purpose of the third aspect of the present application, the present application further provides an electronic device comprising the above-mentioned display screen.

[0025] The present application applies the aryl phosphine spirocyclic bipolar compound comprising a phosphine oxygen group, at least two spirocyclic structures and substituent groups X, E, R1, R2, R3, R4, R5 and R6 to the preparation of the organic thin film layer of the organic electroluminescent device, and sets the substituent groups X, E, R1, R2, R3, R4, R5 and R6 to be each independently selected from a variety of electron-rich groups, so as to improve the hole transport capacity of the aryl phosphine spirocyclic bipolar compound, i.e. to balance the electron / hole transport capacity of the aryl phosphine spirocyclic bipolar compound by coordinating the electron-rich substituent groups X, E, R1, R2, R3, R4, R5 and R6 with the phosphine oxygen group having strong electron transport capacity, and to further improve the rigidity and thermal stability of the aryl phosphine spirocyclic bipolar compound by introducing multiple spirocyclic structures, so as to effectively inhibit the thermal deformation of the organic electroluminescent device during operation, to improve the carrier imbalance problem of the host material used in the organic electroluminescent device, to reduce the turn-on voltage and current efficiency of the organic electroluminescent device, so that the turn-on voltage of the organic electroluminescent device is any one of 4V-5V, and the current efficiency is any one of 25cd / A-30cd / A.

[0026] Further, the present application sets the substituent groups R1, R2, R3, R4, R5 or R6 to be each independently selected from alkyl, aryl or aromatic amine, which can further enhance the electron / hole transport ability and energy level matching of the aryl phosphine spirocyclic bipolar compound, i.e. the aromatic amine is a typical hole transport group, which can effectively improve the HOMO energy level and is conducive to hole injection, the alkyl group is a weak electron-donating group, which can fine-tune the HOMO energy level through inductive effect (+I) and help to adjust the hole transport, and the aryl group can participate in the extension of the π conjugated system and affect the degree of electron delocalization, so that the distribution of HOMO or LUMO orbit is more balanced. That is, the resonance effect (+M / -M) and inductive effect (+I / -I) of the substituent group on the π conjugated system work together to change the π electron cloud density and change the orbital energy level in turn, so as to enhance or balance the electron or hole transport ability, which is conducive to realizing the synergistic transport of electrons and holes on the same molecule, improving the recombination efficiency and reducing the carrier imbalance.

[0027] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear and understandable, and to implement the content of the description, the following is a preferred embodiment of the present application. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described in detail below in combination with examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to these processes, methods, products or devices.

[0031] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in

[0032] The application provides an application of an aryl phosphine spiro ring bipolar compound in an organic electroluminescent device, the organic electroluminescent device comprising an anode layer, a cathode layer and an organic thin film layer between the anode layer and the cathode layer, a mass ratio of the aryl phosphine spiro ring bipolar compound and Ir(ppy)3 in the organic thin film layer being any value in a range from 6:4 to 9.9:0.1, the aryl phosphine spiro ring bipolar compound comprising a phosphine oxygen group, at least two spiro ring structures and substituent groups X, E, R1, R2, R3, R4, R5 and R6, the organic electroluminescent device having a lighting voltage of any value in a range from 4 V to 5 V and a current efficiency of any value in a range from 25 cd / A to 30 cd / A; wherein the aryl phosphine spiro ring bipolar compound has a structure as shown in formula A, formula B or formula C:

[0033]

[0034]

[0035] The substituent group X is any one of O or S, the substituent group E is any one of C, O or S, and the substituent groups R1, R2, R3, R4, R5 and R6 are each independently selected from any one of hydrogen, deuterium, halogen, an electron-withdrawing group or an electron-donating group. Here, the mass ratio of the aryl phosphine spiro ring bipolar compound and Ir(ppy)3 in the organic thin film layer can be 6:4, 7:4, 8:4, 8:2, 8:1.5, 8:1, 8:0.5, 9:0.5, 9.5:0.5, 9.5:0.1 or 9.9:0.1, or any value in a range from 6:4 to 9.9:0.1, and the number of the spiro ring structures in the aryl phosphine spiro ring bipolar compound can be two, three or more.

[0036] In this embodiment, an arylphosphine spiro bipolar compound is used as a main material, that is, an arylphosphine spiro bipolar compound including a phosphine oxygen group, at least two spiro structures and a substituent group X, E, R1, R2, R3, R4, R5, and R6 is applied to the preparation of an organic thin film layer in an organic electroluminescent device, and the substituent groups X, E, R1, R2, R3, R4, R5, and R6 are set to be independently selected from a variety of electron-rich groups to improve the hole transport ability of the arylphosphine spiro bipolar compound, that is, the electron-rich substituent groups X, E, R1, R2, R3, R4, R5, and R6 are synergistically selected. The phosphine oxide group has a strong electron transport ability to balance the electron / hole transport ability of the arylphosphine spiro bipolar compound. At the same time, by introducing multiple spiro structures, the rigidity and thermal stability of the arylphosphine spiro bipolar compound are further improved, thereby effectively suppressing the thermal deformation of the organic electroluminescent device during operation, and at the same time improving the carrier imbalance problem of the main material used for the organic electroluminescent device, reducing the turn-on voltage and current efficiency of the organic electroluminescent device, so that the turn-on voltage of the organic electroluminescent device is any value between 4V and 5V, and the current efficiency is any value between 25cd / A and 30cd / A.

[0037] In this embodiment, by independently selecting the substituent groups X, E, R1, R2, R3, R4, R5, and R6 and regulating the number of spiro structures and the mass ratio of the arylphosphine spiro bipolar compound and Ir(ppy)3 in the organic thin film layer, the turn-on voltage of the organic electroluminescent device can be controlled to 4 V, 4.1 V, 4.2 V, 4.3 V, 4.4 V, 4.5 V, 4.6 V, 4.7 V, 4.8 V, 4.9 V, or 5 V, or any value between 4 V and 5 V, and the current efficiency can be 25 cd / A, 25.5 cd / A, 26 cd / A, 26.5 cd / A, 27 cd / A, 27.5 cd / A, 28 cd / A, 28.5 cd / A, 29 cd / A, 29.5 cd / A, or 30 cd / A, or any value between 25 cd / A and 30 cd / A.

[0038] In a further embodiment, when the substituent R1, R2, R3, R4, R5or R6is an electron- withdrawing group or an electron-donating group, the substituent R1, R2, R3, R4, R5or R6is each independently selected from any one of an alkyl group, an aryl group or an aromatic amine. In this embodiment, by setting the substituent R1, R2, R3, R4, R5or R6to be each independently selected from an alkyl group, an aryl group or an aromatic amine, the electron / hole transport ability and the energy level matching of the aryl phosphine spirocyclic bipolar compound can be further enhanced, i.e. the aromatic amine is a typical hole transport group, which can effectively improve the HOMO energy level and is conducive to hole injection, the alkyl group is a weak electron-donating group, which can fine-tune the HOMO energy level through inductive effect (+I) and is helpful for adjusting hole transport, and the aryl group can participate in the extension of the π conjugated system and affect the degree of electron delocalization, so that the distribution of HOMO or LUMO orbitals is more balanced. That is, the resonance effect (+M / -M) and the inductive effect (+I / -I) of the substituent on the π conjugated system act together to change the π electron cloud density and the orbital energy level in sequence, so as to enhance or balance the electron or hole transport ability, which is conducive to realizing the synergistic transport of electrons and holes on the same molecule, improving the recombination efficiency and reducing the carrier imbalance.

[0039] In a further embodiment, when the substituent R1, R2, R3, R4, R5or R6is an alkyl group, the substituent R1, R2, R3, R4, R5or R6is each independently selected from a substituted or unsubstituted saturated alkyl group or an unsaturated alkyl group having 1-30 carbon atoms. In this embodiment, by setting the substituent R1, R2, R3, R4, R5or R6to be each independently selected from a substituted or unsubstituted saturated alkyl group or an unsaturated alkyl group having 1-30 carbon atoms, the molecular energy level structure and the bipolar transport ability of the aryl phosphine spirocyclic bipolar compound can be further optimized by adjusting the type, saturation and carbon chain length of the substituent, so as to improve the solubility, film uniformity and thermal stability of the material, inhibit the problems of exciton quenching and thermal deformation, and thus effectively improve the charge transport balance of the organic electroluminescent device, reduce the turn-on voltage, prolong the service life and stability of the device. Here, the saturated alkyl group includes methyl, n-butyl and n-decyl, and the unsaturated alkyl group includes an allyl group, an alkynyl group and an olefin chain.

[0040] In a further embodiment, when the substituent group R1, R2, R3, R4, R5or R6is an aryl group, the substituent group R1, R2, R3, R4, R5or R6is each independently selected from a substituted or unsubstituted phenyl group and an aryl heterocyclic structure. In this embodiment, by introducing an aryl substituent group with good conjugation and structural rigidity, the degree of π-conjugation and the molecular rigidity of the aryl phosphine spirocyclic bipolar compound can be significantly enhanced, thereby improving its electron / hole transport capacity and energy level matching. Here, the aryl heterocyclic structure can be any one of a pyridyl group, a thiophene group, a carbazole group or a pyrozine group.

[0041] In a further embodiment, when the substituent group R1, R2, R3, R4, R5or R6is an aromatic amine, the substituent group R1, R2, R3, R4, R5or R6is each independently selected from a substituted or unsubstituted aromatic amine structure, which includes but is not limited to the following structures:

[0042]

[0043] wherein Z is any one of O, S or Se, and Y1and Y2are each independently selected from any one of hydrogen, deuterium, halogen, cycloalkyl, alkoxy, siloxane or a substituted or unsubstituted saturated or unsaturated alkyl group having 1-12 carbon atoms.

[0044] In this embodiment, the aromatic amine structure has a high HOMO energy level and strong electron donor properties, which can effectively improve the molecular hole injection and transport efficiency, and can be used as a hole transport material. When introduced into the host molecule as a substituent group, the hole mobility of the entire molecule can be enhanced, the carrier balance can be promoted, and when Z is a bridging atom, the electron coupling between the amine group and the host skeleton can be enhanced through n-π or d-π conjugation, thereby improving the charge delocalization and migration efficiency. In addition, the introduction of the aromatic amine group can significantly raise the HOMO energy level, appropriately lower the LUMO energy level difference, optimize the energy level matching between the electrode / transport layer, and effectively improve the problem of low recombination efficiency or exciton quenching caused by electron / hole imbalance. Here, the aromatic amine structure can be a triarylamine or carbazole amine group, and the aromatic amine structure includes but is not limited to the above-mentioned structures.

[0045] In a further embodiment, the aryl phosphine spirocyclic bipolar compound is any one of the following compounds:

[0046]

[0047] Here, the structure of the aryl phosphine spirocyclic bipolar compound includes but is not limited to the molecular structures of H1-H20 mentioned above.

[0048] In a further embodiment, the organic thin film layer further comprises, from the anode layer upwards, a hole transport layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer. In this embodiment, by means of the functional division and energy level regulation of the above multi-layer structure, the injection efficiency and transport balance of the carriers in the organic electroluminescent device can be effectively improved, the exciton recombination efficiency in the organic thin film layer can be optimized, and the carrier leakage and non-radiative recombination processes can be inhibited. Here, the aryl phosphine spirocyclic bipolar compound can also be used as a host material for the hole transport layer or the electron transport layer.

[0049] In this embodiment, the preparation method of the organic electroluminescent device is as follows: first, the indium tin oxide glass substrate is cleaned with deionized water, acetone, and ethanol for 30 min respectively, and then treated in a plasma cleaner for 5 min to clean the indium tin oxide glass substrate. Then, a hole transport layer is vacuum deposited on the anode indium tin oxide glass substrate, and then a light-emitting layer is prepared on the hole transport layer by a vacuum mixed evaporation process. The mass ratio of the aryl phosphine spirocyclic bipolar compound to Ir(ppy)3 in the light-emitting layer is any value in the range of 6:4-9.9:0.1. Then, a hole blocking layer, an electron transport layer, an electron injection layer, and a cathode layer are sequentially deposited on the light-emitting layer. Here, the anode layer is an ITO glass substrate, the material of the hole transport layer is n-bromobutane, the material of the hole blocking layer is a blue light-emitting material, the electron transport layer is aluminum quinolinol, the electron injection layer is lithium fluoride, and the material of the cathode layer is aluminum.

[0050] The application will be further described in detail below with reference to specific embodiments.

[0051] In some embodiments, the organic electroluminescent device comprises, from bottom to top, an anode layer, an organic thin film layer, and a cathode layer, which are sequentially stacked. The organic thin film layer comprises a hole transport layer, a light-emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The organic thin film layer comprises an aryl phosphine spirocyclic bipolar compound and Ir(ppy)3 in a mass ratio of any value in the range of 6:4-9.9:0.1. The aryl phosphine spirocyclic bipolar compound can be compound H1, compound H6, or compound H16 with the following structure:

[0052]

[0053] Embodiment 1

[0054] The organic electroluminescent device in the present embodiment comprises, from bottom to top, an ITO glass substrate, a hole transport layer with a thickness of 35 nm and a material of n-bromobutane, an emitting layer with a thickness of 30 nm and a mass ratio of compound H1 to Ir(ppy)3 of 9:1, a hole blocking layer with a thickness of 5 nm and a material of a blue light emitting material, an electron transport layer with a thickness of 25 nm and a material of aluminum quinolinol, an electron injection layer with a thickness of 2 nm and a material of LiF, and a cathode layer with a thickness of 90 nm and a material of aluminum.

[0055] Example 2

[0056] Example 2 differs from Example 1 only in that the host material in the hole transport layer in Example 2 is compound H6.

[0057] Example 3

[0058] Example 3 differs from Example 1 only in that the host material in the hole transport layer in Example 3 is compound H16.

[0059] Comparative Example 1

[0060] Comparative Example 1 differs from Example 1 only in that the host material in the hole transport layer in Comparative Example 1 is 4,4'-N,N'-dicarbazole biphenyl (CBP).

[0061] Firstly, the compounds H1, H6, H16 and CBP in Examples 1-3 and Comparative Example 1 are subjected to thermogravimetric analysis and differential thermal analysis, and the performance test results are shown in Table 1.

[0062] Table 1. Thermogravimetric analysis and differential thermal analysis data of compounds H1, H6, H16 and CBP

[0063] Compound Tg / ℃ Td / ℃ H1 122 443 H6 129 432 H16 114 446 CBP 62 283

[0064] As shown in Table 1, the glass transition temperature and thermal decomposition temperature of compounds H1, H6 and H16 are obviously higher than that of compound CBP, indicating that compounds H1, H6 and H16 have strong rigidity and high heat resistance, while the rigidity of compound CBP is weak and the thermal stability is poor.

[0065] Then, the organic electroluminescent devices in Examples 1-3 and Comparative Example 1 are tested for light and electrical data such as turn-on voltage, maximum current efficiency and color purity, and the performance test results are shown in Table 2.

[0066] Table 2. Light and electrical data of organic electroluminescent devices in Examples 1-3 and Comparative Example 1

[0067] Lighting voltage / V Maximum current efficiency / cd / A Chromaticity coordinates (x,y) Example 1 4.3 27.5 (0.32，0.61) Example 2 4.5 28.1 (0.31，0.62) Example 3 4.6 28.4 (0.32，0.64) Comparative Example 1 6.0 15.1 (0.30，0.60)

[0068] As shown in Table 2, the turn-on voltage of the organic electroluminescent devices in Examples 1-3 is significantly lower than that of Comparative Example 1, indicating that the aryl phosphine spirocyclic bipolar compound has better energy level matching in the hole / electron transport layer, is easier for carrier injection and recombination, reduces the driving threshold of the device, balances the hole / electron transport, and reduces the injection barrier. The current efficiency of Examples 1-3 is nearly 2 times that of Comparative Example 1, indicating that the organic electroluminescent device of Examples 1-3 has higher exciton utilization and carrier recombination efficiency, high thermal stability, more uniform light-emitting layer film, and less exciton quenching. Moreover, the chromaticity coordinates of the organic electroluminescent device in Examples 1-3 slightly fluctuate, but are concentrated in the high-brightness and pure green / yellow-green region, close to the commercial green light-emitting standard, while the chromaticity coordinates of Comparative Example 1 are more blue-green, indicating that the CBP material has poor exciton recombination efficiency and energy level matching, resulting in spectral drift.

[0069] In summary, the aryl phosphine spirocyclic bipolar compound in the present embodiment applied to the organic electroluminescent device can balance the electron / hole transport performance, reduce the turn-on voltage and maximum current efficiency, and stabilize the chromaticity.

[0070] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.

[0071] The above-described embodiments only express several embodiments of the present application, which are described in a more specific and detailed manner, but should not be construed as limiting the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. An organic electroluminescent device, characterized in that: The organic electroluminescent device includes an anode layer, a cathode layer, and an organic thin film layer located between the anode layer and the cathode layer. The mass ratio of the arylphosphine spiro bipolar compound to Ir(ppy)3 in the organic thin film layer is any value between 6:4 and 9.9:0.

1. The arylphosphine spiro bipolar compound includes a phosphineoxy group, at least two spiro structures, and substituent groups X, E, R1, R2, R3, R4, R5, and R6. The turn-on voltage of the organic electroluminescent device is any value between 4V and 5V, and the current efficiency is any value between 25cd / A and 30cd / A. The arylphosphine spiro bipolar compound has a structure as shown in Formula A, Formula B, Formula C, or Formula D: The substituent group X is any one of O and S, the substituent group E is any one of C, O and S, and the substituent groups R1, R2, R3, R4, R5 and R6 are each independently selected from any one of hydrogen, deuterium, halogen, electron-withdrawing group and electron-donating group.

2. The organic electroluminescent device according to claim 1, wherein When the substituent group R1, R2, R3, R4, R5 or R6 is an electron-withdrawing group or an electron-donating group, the substituent group R1, R2, R3, R4, R5 or R6 is independently selected from any one of an alkyl group, an aryl group or an aromatic amine.

3. The organic electroluminescent device according to claim 2, characterized in that: When the substituent group R1, R2, R3, R4, R5 or R6 is an alkyl group, the substituent group R1, R2, R3, R4, R5 or R6 is independently selected from a substituted or unsubstituted saturated alkyl group or an unsaturated alkyl group having 1 to 30 carbon atoms.

4. The organic electroluminescent device according to claim 3, characterized in that: When the substituent group R1, R2, R3, R4, R5 or R6 is an aryl group, the substituent group R1, R2, R3, R4, R5 or R6 is independently selected from substituted or unsubstituted phenyl groups and aryl heterocyclic structures.

5. The organic electroluminescent device according to claim 4, characterized in that: When the substituent group R1, R2, R3, R4, R5 or R6 is an aromatic amine, the substituent group R1, R2, R3, R4, R5 or R6 is independently selected from substituted or unsubstituted aromatic amine structures, and the aromatic amine structure includes but is not limited to the following structures: Wherein, Z is any one of O, S or Se, and Y1 and Y2 are each independently selected from any one of hydrogen, deuterium, halogen, cycloalkyl, mercapto, alkoxy, siloxane or a substituted or unsubstituted saturated or unsaturated alkyl group having 1 to 12 carbon atoms.

6. The organic electroluminescent device according to any one of claims 1 to 5, characterized in that: The arylphosphine spiro bipolar compound is any one of the following compounds:

7. The organic electroluminescent device according to claim 6, characterized in that: The organic thin film layer further includes a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer which are sequentially stacked upward from the anode layer.

8. A display screen, characterized in that: The device comprises a cover plate, a back plate, and the organic electroluminescent device according to any one of claims 1 to 7, wherein the organic electroluminescent device is located between the back plate and the cover plate.

9. An electronic device, characterized in that: It comprises a housing assembly and the display screen as claimed in claim 8, wherein the display screen is located inside the housing assembly.

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