An organic host material and an organic light emitting device comprising the same

Abstract

The application provides an organic host material and an organic light-emitting device containing the same, the organic host material has a structure shown in formula I. The application provides a host material composed of benzoanthracene and benzo-3,4-phenanthrene; the structure of the host material contains two units of benzoanthracene and benzo-3,4-phenanthrene, and also contains other aromatic groups and the like, and mainly has the following advantages: the material is relatively simple to synthesize, the preparation cost is low, and large-scale production is facilitated; the HOMO and LUMO energy level structures of the material are suitable, and the injection of carriers is facilitated; the host material takes benzoanthracene and benzo-3,4-phenanthrene as the core, has high mobility, and is beneficial to the transmission of carriers in the light-emitting layer; the host material has a high triplet energy level, and is beneficial to limiting the excitation energy in the guest molecules for light emission.

Description

Technical Field

[0001] This invention belongs to the field of organic light-emitting materials and synthetic chemistry technology, and relates to an organic host material and an organic light-emitting device containing the same. Background Technology

[0002] Organic light-emitting diodes (OLEDs), as a next-generation display technology, have gradually become an important component of current display technologies due to their numerous advantages such as self-illumination, flexibility, high contrast, and energy saving, and have received widespread attention from academia and industry. In OLED devices, the emissive layer, as a key structure, is often composed of a mixture of guest and host materials. The host material disperses the guest material, preventing excessively high guest molecule concentrations that could lead to fluorescence quenching. Furthermore, the host material also plays a role in carrier transport and exciton energy transfer. Developing suitable host materials is crucial for improving the performance of OLED devices.

[0003] Most existing host materials are anthracene derivatives. However, these host materials have certain limitations, such as insufficient bandwidth and insufficient triplet energy level. In particular, when applied to deep blue light devices, they cannot play a good energy transfer role, which has a certain adverse effect on the performance of the device.

[0004] Therefore, there is a desire in this field to develop a host material with a large bandwidth and a high triplet energy level, which can be used in OLED devices to enable the devices to have better performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an organic host material and an organic light-emitting device comprising the same. Specifically, addressing the problem that current host materials cannot effectively transfer energy to guest materials, the present invention provides a binuclear host material with a large bandwidth, high triplet energy level, and excellent performance in devices.

[0006] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides an organic host material having a structure as shown in Formula I: Formula I; Ar1 is selected from any one of substituted or unsubstituted aryl groups and substituted or unsubstituted heteroaryl groups, wherein the heteroatom in the heteroaryl group is O or S; L1 and L2 may be the same as or different from each other, and each is independently selected from any one of direct bond, substituted or unsubstituted aryl group, substituted or unsubstituted heteroaryl group, wherein the heteroatom in the heteroaryl group is O or S; Ar2 is selected from any one of hydrogen, deuterium, substituted or unsubstituted aryl groups; Ar3 is selected from any one of hydrogen, substituted or unsubstituted aryl groups; The substituents described in Ar1, L1, L2, Ar2, and Ar3 are each independently selected from deuterium, halogens, straight-chain or branched alkyl groups of C1-C10 (e.g., C1, C2, C3, C4, C5, C6, C7, C8, C9, or C10), and aryl groups of C6-C30 (e.g., C6, C8, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, etc.).

[0007] This invention provides a host material composed of benzanthracene and benzo-3,4-phenanthrene linked together. The host material contains two units, benzanthracene and benzo-3,4-phenanthrene, as well as other aromatic groups, and has the following advantages: the material is relatively simple to synthesize, has low preparation cost, and is conducive to large-scale production; the material has suitable HOMO and LUMO energy level structures, which is beneficial for carrier injection; the host material, with benzanthracene and benzo-3,4-phenanthrene as its core, has high mobility, which is beneficial for carrier transport in the luminescent layer; the host material has a high triplet energy level, which is beneficial for confining exciton energy within the luminescent guest molecule.

[0008] Preferably, the organic host material has the structure shown in any one of formulas I-1 to I-4: .

[0009] Preferably, the Ar1 is selected from any one of substituted or unsubstituted C6-C30 (e.g., C6, C8, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, etc.) aryl groups, or substituted or unsubstituted C3-C30 (e.g., C3, C4, C6, C8, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, etc.) heteroaryl groups.

[0010] Preferably, the Ar1 is selected from any one of the following groups: phenyl, naphthyl, biphenyl, terphenyl, dibenzofuranyl, substituted or unsubstituted carbazole group.

[0011] Preferably, the Ar1 is selected from any one of the following groups: ; In this context, dashed lines represent the bonding sites of functional groups.

[0012] In this invention, Ar1 is used to adjust the degree of orientation during molecular packing.

[0013] Preferably, the Ar2 is used to adjust the degree of orientation and molecular conjugation length during molecular stacking, and is selected from any one of hydrogen, deuterium, phenyl, and naphthyl.

[0014] Preferably, the Ar3 is selected from any one of hydrogen, substituted or unsubstituted aryl groups of C6-C30 (e.g., C6, C8, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, etc.).

[0015] Preferably, the Ar3 is selected from any one of the following groups: hydrogen, phenyl, naphthyl, biphenyl, naphthylbiphenyl, terphenyl.

[0016] Preferably, the Ar3 is selected from hydrogen or any one of the following groups: ; In this context, dashed lines represent the bonding sites of functional groups.

[0017] In this invention, Ar3 is used to enhance the fluorescence intensity of the material.

[0018] Preferably, L1 and L2 are each independently selected from direct bonds, arylene groups of C6-C30 (e.g., C6, C8, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, etc.), and heteroarylene groups of C3-C30 (e.g., C3, C4, C6, C8, C9, C10, C12, C14, C16, C18, C20, C22, C24, C26, C28, C30, etc.).

[0019] Preferably, L1 and L2 are each independently selected from any one of direct bond, phenylene, naphthylene, and dibenzofuranyl.

[0020] Preferably, L1 and L2 are each independently selected from a direct bond or any one of the following groups: ; In this context, dashed lines represent the bonding sites of functional groups.

[0021] In this invention, L1 and / or L2 are used to adjust the fluorescence intensity and orientation of the molecule.

[0022] Preferably, the hydrogen atoms in the organic host material with the structure shown in Formula I can be partially or completely replaced by deuterium.

[0023] Preferably, the organic host material has a structure shown in any one of the following molecular formulas 1 to 100: .

[0024] Preferably, the hydrogen atoms in the structure shown in any one of the molecular formulas 1 to 100 can be partially or completely replaced by deuterium.

[0025] In a second aspect, the present invention provides an organic light-emitting device, the organic light-emitting device comprising a cathode, a light-emitting layer, and an anode, wherein the light-emitting layer is formed by co-doping a host material and a guest material, and the host material comprises the organic host material as described in the first aspect.

[0026] Preferably, the cathode is a metal cathode.

[0027] Preferably, the organic light-emitting device further includes any one or a combination of at least two of the following: an electron injection layer, an electron transport layer, a hole transport layer, and a hole injection layer.

[0028] Preferably, the organic light-emitting device comprises, from top to bottom, a metal cathode, an electron injection layer, an electron transport layer, a light-emitting layer, a hole transport layer, a hole injection layer, an anode, and a glass substrate, and the device is fabricated by vapor deposition.

[0029] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a host material composed of benzanthracene and benzo-3,4-phenanthrene linked together. The host material contains two units, benzanthracene and benzo-3,4-phenanthrene, as well as other aromatic groups, and has the following advantages: the material is relatively simple to synthesize, has low preparation cost, and is conducive to large-scale production; the material has suitable HOMO and LUMO energy level structures, which is beneficial for carrier injection; the host material, with benzanthracene and benzo-3,4-phenanthrene as its core, has high mobility, which is beneficial for carrier transport in the luminescent layer; the host material has a high triplet energy level, which is beneficial for confining exciton energy within the luminescent guest molecule. Attached Figure Description

[0030] Figure 1 A schematic diagram of the organic light-emitting device provided for application example 1; Among them, 1-metal cathode, 2-electron injection layer, 3-electron transport layer, 4-light emission layer, 5-hole transport layer, 6-hole injection layer, 7-anode, and 8-glass substrate. Detailed Implementation

[0031] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0032] Where specific experimental steps or conditions are not specified in the embodiments of this invention, they can be performed according to conventional experimental steps or conditions described in the literature in this field. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products.

[0033] Compounds for which no synthetic method is mentioned in this invention are all commercially available raw material products. The solvents and reagents used in this invention can be purchased from the domestic chemical market; additionally, those skilled in the art can synthesize them using well-known methods.

[0034] Example 1 This embodiment provides a compound with molecular formula 1, and the synthetic route is shown below: The specific synthesis method includes the following steps: R1 (20.0 g), R2 (15.5 g), Pd(PPh3)4 (0.59 g), and potassium carbonate (14.30 g) were added sequentially to a reaction flask and dissolved in a tetrahydrofuran / water (200 mL / 50 mL) mixed solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 15 hours. 300 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M1 (24.2 g, 85% yield). Mass spectrometry m / z: theoretical value: 488.13; measured value: 488.14. These results confirm that the obtained product is the target product.

[0035] M1 (20.0 g), R3 (5.03 g), Pd-132 (0.26 g), and potassium carbonate (10.35 g) were added sequentially to a reaction flask and dissolved in a toluene / ethanol / water mixture (200 mL / 50 mL / 50 mL) under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 15 hours. 200 mL of pure water and 100 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by formula 1 (15.12 g, yield 76%). Mass spectrometry m / z: theoretical value: 530.20; measured value: 530.20. These results confirm that the obtained product is the target product.

[0036] Example 2 This embodiment provides a compound with molecular formula 2, and the synthetic route is shown below: The specific synthesis method includes the following steps: R4 (20.0 g), R5 (13.81 g), Pd-132 (0.33 g), and potassium carbonate (12.74 g) were added sequentially to a reaction flask and dissolved in a toluene / ethanol / water mixture (200 mL / 50 mL / 50 mL) under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 15 hours. 200 mL of pure water and 100 mL of toluene were added, and the mixture was allowed to stand for separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by formula 2 (20.64 g, 77% yield). Mass spectrometry m / z: theoretical value: 580.22; measured value: 580.23. These results confirm that the obtained product is the target product.

[0037] Example 3 This embodiment provides a compound with molecular formula 6, and the synthetic route is shown below: The specific synthesis method includes the following steps: M1 (20.0 g), R6 (8.17 g), Pd-132 (0.27 g), and potassium carbonate (10.35 g) were added sequentially to a reaction flask and dissolved in a toluene / ethanol / water mixture (200 mL / 50 mL / 50 mL) under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 15 hours. 200 mL of pure water and 100 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by molecular formula 6 (17.15 g, yield 69%). Mass spectrometry m / z: theoretical value: 606.23; measured value: 606.25. These results confirm that the obtained product is the target product.

[0038] Example 4 This embodiment provides a compound with molecular formula 11, and the synthetic route is shown below: The specific synthesis method includes the following steps: R7 (30.0 g), R3 (10.42 g), Pd(PPh3)4 (0.89 g), and potassium carbonate (21.44 g) were added sequentially to a reaction flask and dissolved in a tetrahydrofuran / water (300 mL / 80 mL) mixed solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 16 hours. 400 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M2 (19.95 g, yield 67%). Mass spectrometry m / z: theoretical value: 382.04; measured value: 382.06. These results confirm that the obtained product is the target product M2.

[0039] M2 (18.0 g), R8 (17.89 g), PdCl2 (dppf) (0.34 g), and potassium acetate (13.81 g) were added sequentially to a reaction flask and dissolved in dioxane (400 mL) solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 6 hours. 400 mL of pure water and 100 mL of ethyl acetate were added, and the mixture was allowed to stand for separation. The aqueous phase was extracted three times with 100 mL of ethyl acetate. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M3 (14.75 g, 73% yield). Mass spectrometry m / z: theoretical value: 430.21; measured value: 430.22. These results confirm that the obtained product is the target product M3.

[0040] M3 (14.0 g), R4 (12.69 g), Pd-132 (0.23 g), and potassium carbonate (8.97 g) were added sequentially to a reaction flask and dissolved in a toluene / ethanol / water mixture (200 mL / 50 mL / 50 mL) under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 14 hours. 200 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by molecular formula 11 (16.45 g, 77% yield). Mass spectrometry m / z: theoretical value: 656.25; measured value: 656.26. These results confirm that the obtained product is the target product with molecular formula 11.

[0041] Example 5 This embodiment provides a compound with molecular formula 21, and the synthetic route is shown below: The specific synthesis method includes the following steps: M1 (13.0 g), R9 (7.35 g), Pd-132 (0.17 g), and potassium carbonate (6.73 g) were added sequentially to a reaction flask and dissolved in a toluene / ethanol / water mixture (200 mL / 50 mL / 50 mL) under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 14 hours. 200 mL of pure water and 100 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by molecular formula 21 (13.63 g, 75% yield). Mass spectrometry m / z: theoretical value: 682.27; measured value: 682.29. These results confirm that the obtained product is the target product with molecular formula 21.

[0042] Example 6 This embodiment provides a compound with molecular formula 30, and the synthetic route is shown below: The specific synthesis method includes the following steps: R7 (30.0 g), R10 (16.93 g), Pd(PPh3)4 (0.89 g), and potassium carbonate (21.44 g) were added sequentially to a reaction flask and dissolved in a tetrahydrofuran / water (300 mL / 80 mL) mixed solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 16 hours. 400 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M4 (27.13 g, 76% yield). Mass spectrometry m / z: theoretical value: 458.07; measured value: 458.08. These results confirm that the obtained product is the target product M4.

[0043] M4 (24.0 g), R8 (19.90 g), PdCl2 (dppf) (0.38 g), and potassium acetate (15.36 g) were added sequentially to a reaction flask and dissolved in dioxane (400 mL) solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 6 hours. 400 mL of pure water and 100 mL of ethyl acetate were added, and the mixture was allowed to stand for separation. The aqueous phase was extracted three times with 100 mL of ethyl acetate. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M5 (19.31 g, 73% yield). Mass spectrometry m / z: theoretical value: 506.24; measured value: 506.25. These results confirm that the obtained product is the target product M5.

[0044] M5 (16.0 g), R11 (10.90 g), Pd-132 (0.22 g), and potassium carbonate (8.72 g) were added sequentially to a reaction flask and dissolved in a toluene / ethanol / water mixture (200 mL / 50 mL / 50 mL) under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 14 hours. 200 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by molecular formula 30 (14.67 g, yield 68%). Mass spectrometry m / z: theoretical value: 682.27; measured value: 682.28. These results confirm that the obtained product is the target product with molecular formula 30.

[0045] Example 7 This embodiment provides a compound with molecular formula 38, and the synthetic route is shown below: The specific synthesis method includes the following steps: R7 (30.0 g), R9 (23.43 g), Pd(PPh3)4 (0.89 g), and potassium carbonate (21.44 g) were added sequentially to a reaction flask and dissolved in a tetrahydrofuran / water (300 mL / 80 mL) mixed solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 16 hours. 400 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M6 (35.37 g, 85% yield). Mass spectrometry m / z: theoretical value: 534.10; measured value: 534.12. These results confirm that the obtained product is the target product M6.

[0046] M6 (30.0 g), R8 (21.34 g), PdCl2 (dppf) (0.41 g), and potassium acetate (16.47 g) were added sequentially to a reaction flask and dissolved in dioxane (400 mL) solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 6 hours. 400 mL of pure water and 100 mL of ethyl acetate were added, and the mixture was allowed to stand for separation. The aqueous phase was extracted three times with 100 mL of ethyl acetate. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M5 (23.50 g, 72% yield). Mass spectrometry m / z: theoretical value: 582.27; measured value: 582.29. These results confirm that the obtained product is the target product M7.

[0047] M7 (18.0 g), R4 (12.05 g), Pd-132 (0.22 g), and potassium carbonate (8.52 g) were added sequentially to a reaction flask and dissolved in a toluene / ethanol / water mixture (200 mL / 50 mL / 50 mL) under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 14 hours. 200 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by molecular formula 38 (19.00 g, yield 76%). Mass spectrometry m / z: theoretical value: 808.31; measured value: 808.33. These results confirm that the obtained product is the target product with molecular formula 38.

[0048] Example 8 This embodiment provides a compound with molecular formula 45, and the synthetic route is shown below: The specific synthesis method includes the following steps: R7 (30.0 g), R12 (21.20 g), Pd(PPh3)4 (0.89 g), and potassium carbonate (21.44 g) were added sequentially to a reaction flask and dissolved in a tetrahydrofuran / water (300 mL / 80 mL) mixed solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 16 hours. 400 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M8 (31.27 g, 79% yield). Mass spectrometry m / z: theoretical value: 508.08; measured value: 508.09. These results confirm that the obtained product is the target product M8.

[0049] M8 (25.0 g), R8 (18.69 g), PdCl2 (dppf) (0.41 g), and potassium acetate (16.47 g) were added sequentially to a reaction flask and dissolved in dioxane (400 mL) solvent under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 6 hours. 400 mL of pure water and 100 mL of ethyl acetate were added, and the mixture was allowed to stand for separation. The aqueous phase was extracted three times with 100 mL of ethyl acetate. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by M9 (18.57 g, 68% yield). Mass spectrometry m / z: theoretical value: 556.26; measured value: 556.26. These results confirm that the obtained product is the target product M9.

[0050] M9 (16.0 g), R11 (9.92 g), Pd-132 (0.22 g), and potassium carbonate (8.52 g) were added sequentially to a reaction flask and dissolved in a toluene / ethanol / water mixture (200 mL / 50 mL / 50 mL) under a nitrogen atmosphere. The reaction was stopped after reflux and stirring for 14 hours. 200 mL of pure water and 200 mL of toluene were added, and the mixture was allowed to stand for phase separation. The aqueous phase was extracted three times with 100 mL of toluene. The organic phases were combined, dried over anhydrous magnesium sulfate, and purified by silica gel column chromatography to obtain the compound represented by molecular formula 3845 (17.07 g, yield 81%). Mass spectrometry m / z: theoretical value: 732.28; measured value: 732.29. These results confirm that the obtained product is the target product with molecular formula 45.

[0051] Application Example 1 This application example provides an organic light-emitting device, the schematic diagram of which is shown below. Figure 1 As shown, from top to bottom, the device includes a metal cathode 1, an electron injection layer 2, an electron transport layer 3, a light-emitting layer 4, a hole transport layer 5, a hole injection layer 6, an anode 7, and a glass substrate 8, which are stacked sequentially. The device is fabricated using a vapor deposition method.

[0052] The metal cathode is made of aluminum, with a deposition rate of 0.2 nm / s and a thickness of 100 nm. The electron injection layer is made of lithium fluoride, with a deposition rate of 0.08 nm / s and a thickness of 1 nm. The electron transport layer is a compound LET003 with the following structure, with a deposition rate of 0.08 nm / s and a thickness of 40 nm; LET003; The light-emitting layer is formed by co-doping of a host material and a guest material. The host material is the compound with molecular formula 1 provided in Example 1, and the guest material is LBD001 with the following structure. The mass ratio of the host material to the guest material is 90:10, the evaporation rate is 0.01 nm / s, and the thickness is 40 nm. ; The hole transport layer is made of NPB compound with the following structure, with a deposition rate of 0.1 nm / s and a thickness of 100 nm. NPB; The hole injection layer is a compound HATCN with the following structure, with a deposition rate of 0.08 nm / s and a thickness of 10 nm; HATCN; The anode is indium tin oxide.

[0053] Application Examples 2-8 The only difference from Application Example 1 is that the main material of the light-emitting layer (the compound shown in Formula 1) is replaced with the compounds shown in Formula 2, Formula 6, Formula 11, Formula 21, Formula 30, Formula 38, and Formula 45, respectively.

[0054] Comparative Application Example 1 The only difference from Application Example 1 is that the host material of the luminescent layer (the compound shown in Formula 1) is replaced with the commercially available host material LBH001, the structure of which is shown below: LBH001.

[0055] Device performance testing The following performance measurements were performed on the organic light-emitting devices provided in the application examples and comparative application examples of this invention: A Keithley digital source meter was used in conjunction with a luminance meter and a spectral radiometry system to collect device voltage-current density-luminance (JVL) data: the device luminance was set to 1 cd / m². 2 The corresponding driving voltage is recorded as the start-up voltage; the current efficiency is calculated based on the conversion between brightness and current density, and the maximum value within the entire test range is taken as the maximum current efficiency; the emission spectrum of the device is collected by a spectroradiometer, and the chromaticity coordinates are calculated according to the CIE 1931 chromaticity standard; the device is subjected to aging tests under constant current conditions at room temperature, and the number of hours it takes for the brightness to decay to 97% of the initial brightness is recorded, which is the T97 lifespan. All optoelectronic performance tests are performed in accordance with the national standard GB / T 20871.61—2024 "Organic Light Emitting Diode Display Devices Part 6-1: Test Methods for Optical and Optoelectronic Parameters".

[0056] The performance test results are shown in Table 1.

[0057] Table 1 As can be seen from Table 1, compared with the commercial material LBH001, the device prepared by the organic host material provided by the present invention has a lower turn-on voltage (3.4~3.8V), a higher maximum current efficiency (7.9~8.6cd / A), and a higher lifetime (75~96h).

[0058] In summary, the main material provided by this invention can effectively improve the performance of organic light-emitting devices when applied to them.

[0059] The applicant declares that the present invention is illustrated through the above embodiments to demonstrate the organic host material and the organic light-emitting device comprising it, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials used in the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. An organic host material, characterized in that, The organic host material has the structure shown in Formula I: Formula I; Ar1 is selected from any one of substituted or unsubstituted aryl groups and substituted or unsubstituted heteroaryl groups, wherein the heteroatom in the heteroaryl group is O or S; L1 and L2 may be the same as or different from each other, and each is independently selected from any one of direct bond, substituted or unsubstituted aryl group, substituted or unsubstituted heteroaryl group, wherein the heteroatom in the heteroaryl group is O or S; Ar2 is selected from any one of hydrogen, deuterium, substituted or unsubstituted aryl groups; Ar3 is selected from any one of hydrogen, substituted or unsubstituted aryl groups; The substituents described in Ar1, L1, L2, Ar2, and Ar3 are each independently selected from any one of deuterium, halogen, C1-C10 straight-chain or branched alkyl groups, and C6-C30 aryl groups.

2. The organic host material according to claim 1, characterized in that, The organic host material has the structure shown in any one of Formulas I-1 to I-4: 。 3. The organic host material according to claim 1 or 2, characterized in that, The Ar1 is selected from any one of substituted or unsubstituted C6-C30 aryl groups and substituted or unsubstituted C3-C30 heteroaryl groups; Preferably, the Ar1 is selected from any one of the following groups: phenyl, naphthyl, biphenyl, terphenyl, dibenzofuranyl, substituted or unsubstituted carbazole group; Preferably, the Ar1 is selected from any one of the following groups: ； In this context, dashed lines represent the bonding sites of functional groups.

4. The organic host material according to any one of claims 1-3, characterized in that, The Ar2 is selected from any one of hydrogen, deuterium, phenyl, and naphthyl.

5. The organic host material according to any one of claims 1-4, characterized in that, The Ar3 is selected from any one of hydrogen, substituted or unsubstituted C6-C30 aryl groups; Preferably, the Ar3 is selected from any one of the following groups: hydrogen, phenyl, naphthyl, biphenyl, naphthyl-biphenyl, terphenyl; Preferably, the Ar3 is selected from hydrogen or any one of the following groups: ； In this context, dashed lines represent the bonding sites of functional groups.

6. The organic host material according to any one of claims 1-5, characterized in that, L1 and L2 are each independently selected from any one of direct bond, C6-C30 aryl group, and C3-C30 heteroaryl group; Preferably, L1 and L2 are each independently selected from any one of direct bond, phenylene, naphthylene, and dibenzofuranyl; Preferably, L1 and L2 are each independently selected from a direct bond or any one of the following groups: ； In this context, dashed lines represent the bonding sites of functional groups.

7. The organic host material according to any one of claims 1-6, characterized in that, In organic host materials with structures as shown in Formula I, hydrogen atoms can be partially or completely replaced by deuterium.

8. The organic host material according to any one of claims 1-7, characterized in that, The organic host material has a structure shown in any one of the following molecular formulas from molecular formula 1 to molecular formula 100: ； Preferably, the hydrogen atoms in the structure shown in any one of the molecular formulas 1 to 100 can be partially or completely replaced by deuterium.

9. An organic light-emitting device, characterized in that, The organic light-emitting device includes a cathode, a light-emitting layer, and an anode. The light-emitting layer is formed by co-doping a host material and a guest material. The host material includes the organic host material as described in any one of claims 1-8. Preferably, the cathode is a metal cathode.

10. The organic light-emitting device according to claim 9, characterized in that, The organic light-emitting device further includes any one or a combination of at least two of the following: an electron injection layer, an electron transport layer, a hole transport layer, and a hole injection layer; Preferably, the organic light-emitting device comprises, from top to bottom, a metal cathode, an electron injection layer, an electron transport layer, a light-emitting layer, a hole transport layer, a hole injection layer, an anode, and a glass substrate, which are stacked sequentially.

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