An organic electroluminescence device, an organic electronic device, and a display device

Abstract

This invention relates to the field of organic electroluminescence technology, specifically disclosing an organic electroluminescent device, an organic electronic device, and a display device. The organic electroluminescent device of this invention includes an organic light-emitting layer and an organic sensitizing layer. The organic light-emitting layer includes a host material I and a luminescent dye, and the organic sensitizing layer includes a host material II and a sensitizer material. The luminescent dye is a multi-resonance thermally activated delayed fluorescence (TMF) material, and the sensitizer material includes both TMF and phosphorescent materials. The device of this invention employs a method of doping the sensitizer material and the TMF material into different host materials to form two adjacent layers, achieving 100% exciton utilization and resulting in an organic electroluminescent device with high efficiency, low roll-off, and a narrow spectrum.

Description

Technical Field

[0001] This invention relates to the field of organic electroluminescence technology, and specifically discloses an organic electroluminescent device, an organic electronic device, and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs), as devices that emit light through current, offer advantages such as energy efficiency, low cost, thinness, and flexibility. Their light-emitting principle involves the combination of electrons and holes in the organic light-emitting layer when an appropriate voltage is applied, generating excitons that emit light of different wavelengths depending on the light-emitting material within the layer. Currently, organic light-emitting materials are mainly classified into three categories: traditional fluorescent materials, phosphorescent materials, and thermally activated delayed fluorescence materials.

[0003] Traditional fluorescent materials suffer from low exciton utilization due to their inability to utilize triplet excitons. While phosphorescent materials can achieve 100% exciton utilization through heavy atom effects, the introduction of heavy metal atoms leads to high costs. In contrast, thermally activated delayed fluorescence (TEF) materials can achieve 100% exciton utilization through reverse intersystem crossing without introducing heavy metal atoms, making them the preferred choice for luminescent materials. With the emergence of multi-resonance TEF materials, narrow-spectrum emission has been further achieved, significantly enhancing their practical applications. However, most multi-resonance TEF materials are prone to triplet exciton quenching due to their long triplet lifetime, leading to significant device efficiency roll-off and limiting their applications.

[0004] Therefore, given the large efficiency roll-off of current multi-resonance thermally activated delayed fluorescence materials, how to reduce triplet exciton quenching and enable the prepared organic electroluminescent devices to have high efficiency, narrow spectrum, and low roll-off is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides an organic electroluminescent device, an organic electronic device, and a display device. The organic electroluminescent device uses interlayer sensitized multiple resonant thermally activated delayed fluorescence material or phosphorescent material to overcome the large efficiency roll-off defect of current multiple resonant thermally activated delayed fluorescence materials. The prepared organic electroluminescent device has the characteristics of high efficiency, narrow spectrum, and low roll-off, and is used to solve the technical problems in the prior art.

[0006] In one aspect, the present invention discloses an organic electroluminescent device, comprising:

[0007] This invention provides an organic electroluminescent device, comprising a substrate, an anode, a cathode, and an organic functional layer. The organic functional layer is disposed between the anode and the cathode. The organic functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an organic sensitization layer, an electron transport layer, and an electron injection layer, which are arranged sequentially from the anode to the cathode.

[0008] The organic light-emitting layer includes a host material I and a light-emitting dye, and the organic sensitizing layer includes a host material II and a sensitizer material.

[0009] Preferably, the triplet energy level of the host material I is higher than that of the luminescent dye;

[0010] The triplet energy level of the host material II is higher than that of the sensitizer material.

[0011] Preferably, the main material I comprises a compound containing at least one group selected from carbazolyl, carbaolinyl, spirofluorenyl, fluorenyl, silyl, and phosphooxy groups;

[0012] The main material II comprises a compound containing at least one group selected from carbazolyl, carbaolinyl, spirofluorenyl, fluorenyl, silyl, and phosphooxy groups.

[0013] Preferably, the luminescent dye is a multi-resonance thermally activated delayed fluorescence material.

[0014] Preferably, the sensitizer material includes thermally activated delayed fluorescence material and phosphorescent material.

[0015] Preferably, the triplet energy level of the sensitizer material is higher than the triplet energy level of the luminescent dye.

[0016] Preferably, the core structure of the multiple resonance thermally activated delayed fluorescence material comprises one or more of carbon atoms, boron atoms, nitrogen atoms, and oxygen atoms;

[0017] The singlet energy level S1 and triplet energy level T1 of the multi-resonance thermally activated delayed fluorescence material satisfy:

[0018] ΔE ST =S1-T1≤0.4eV;

[0019] The Stokes shift λ of the multiple resonance thermally activated delayed fluorescence material satisfies: λ≤60nm.

[0020] Preferably, the doping concentration of the multiple resonant thermally activated delayed fluorescence material in the organic light-emitting layer is from 0.1 wt% to 30 wt%, and the doping concentration of the sensitizer material in the organic sensitization layer is from 1 wt% to 100 wt%.

[0021] On the other hand, the present invention also discloses an organic electronic device that uses an organic electroluminescent device, wherein the organic electronic device is disposed therein, and the organic electronic device includes an optical sensor, a solar cell, an illumination element, an organic thin-film transistor, an organic field-effect transistor, an organic thin-film solar cell, an information tag, an electronic artificial skin sheet, a sheet-type scanner, and electronic paper.

[0022] On the other hand, the present invention also discloses a display device with an organic electroluminescent device, wherein the organic electroluminescent device is disposed in the display device, and the display device is a display element, an illumination element, an information tag, an electronic artificial skin sheet or electronic paper.

[0023] The organic electroluminescent device, organic electronic device, and display device provided by this invention have the following advantages compared with the prior art:

[0024] The organic electroluminescent device of this invention utilizes thermally activated delayed fluorescence (TRF) materials or phosphorescent materials to sensitize multi-resonance TRF materials for luminescence. The excitons used for luminescence in the multi-resonance TRF materials are primarily singlet excitons formed through rapid energy transfer by the TRF materials or phosphorescent materials, which act as sensitizers. This significantly reduces the formation of triplet excitons in the multi-resonance TRF materials and minimizes their quenching. Therefore, this invention effectively solves the problem of large roll-off in devices using multi-resonance TRF materials as luminescent materials, effectively enhancing the stability of organic electroluminescent devices.

[0025] The electroluminescent device of the present invention employs a method of doping sensitizer material and multiple resonant thermally activated delayed fluorescence material into two adjacent layers in different substrates, which can effectively solve the problem that a single substrate cannot simultaneously accommodate sensitizer material and multiple resonant thermally activated delayed fluorescence material, and effectively enhance the electroluminescence performance of organic electroluminescent devices.

[0026] The electroluminescent device of the present invention does not contain three or more co-doped phases, and the preparation process is simple and easy to achieve large-scale mass production. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the organic electroluminescent device prepared according to an embodiment of the present invention.

[0029] In the figure: 1. Substrate; 2. Anode; 3. Hole injection layer; 4. Hole transport layer; 5. Organic light-emitting layer; 6. Organic sensitization layer; 7. Electron transport layer; 8. Electron injection layer; 9. Cathode. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] like Figure 1 As shown, this invention discloses an organic electroluminescent device, comprising:

[0035] The substrate 1, anode 2, cathode 9, and organic functional layer are disposed between the anode 2 and the cathode 9. The organic functional layer includes a hole injection layer 3, a hole transport layer 4, an organic light-emitting layer 5, an organic sensitization layer 6, an electron transport layer 7, and an electron injection layer 8. The hole injection layer 3, hole transport layer 4, organic light-emitting layer 5, organic sensitization layer 6, electron transport layer 7, and electron injection layer 8 are arranged sequentially from the anode 2 to the cathode 9.

[0036] The organic light-emitting layer 5 includes a host material I and a light-emitting dye, and the organic sensitizing layer 6 includes a host material II and a sensitizer material.

[0037] Preferably, the triplet energy level of the host material I is higher than that of the luminescent dye;

[0038] The triplet energy level of the host material II is higher than that of the sensitizer material.

[0039] Preferably, the main material I comprises a compound containing at least one group selected from carbazolyl, carbaolinyl, spirofluorenyl, fluorenyl, silyl, and phosphooxy groups;

[0040] The main material II comprises a compound containing at least one group selected from carbazolyl, carbaolinyl, spirofluorenyl, fluorenyl, silyl, and phosphooxy groups.

[0041] Preferably, the luminescent dye is a multi-resonance thermally activated delayed fluorescence material.

[0042] Preferably, the sensitizer material includes thermally activated delayed fluorescence material and phosphorescent material.

[0043] Preferably, the triplet energy level of the sensitizer material is higher than the triplet energy level of the luminescent dye.

[0044] Preferably, the core structure of the multiple resonance thermally activated delayed fluorescence material comprises one or more of carbon atoms, boron atoms, nitrogen atoms, and oxygen atoms;

[0045] The singlet energy level S1 and triplet energy level T1 of the multi-resonance thermally activated delayed fluorescence material satisfy:

[0046] ΔE ST =S1-T1≤0.4eV;

[0047] The Stokes shift λ of the multiple resonance thermally activated delayed fluorescence material satisfies: λ≤60nm.

[0048] Preferably, the doping concentration of the multiple resonant thermally activated delayed fluorescence material in the organic light-emitting layer 5 is from 0.1 wt% to 30 wt%, and the doping concentration of the sensitizer material in the organic sensitization layer 6 is from 1 wt% to 100 wt%.

[0049] Specifically, substrate 1 can be made of glass or polymer material with excellent mechanical strength, thermal stability, water resistance, and transparency. Furthermore, substrate 1 used for a display can also contain thin-film transistors (TFTs).

[0050] The anode 2 can be formed by sputtering or depositing anode material on the substrate 1. The material of the anode 2 can be any combination of transparent conductive oxide materials such as indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO2), and zinc oxide (ZnO). The hole injection layer 3, hole transport layer 4, organic light-emitting layer 5, organic sensitization layer 6, electron transport layer 7, and electron injection layer 8 can be made of organic small molecules, organic macromolecules, polymers, metals, inorganic oxides, inorganic fluorides, inorganic nitrides, inorganic carbides, and combinations thereof. These materials can be sequentially prepared on the anode 2 by vacuum thermal evaporation, spin coating, printing, or other methods.

[0051] The cathode 9 can be prepared sequentially on the electron injection layer 8 using metals or alloys such as magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), and magnesium-silver (Mg-Ag), or any combination thereof, through methods such as vacuum thermal evaporation, spin coating, or printing.

[0052] An anode 2 is disposed on the upper side of substrate 1; substrate 1 is disposed on the lower side of anode 2, and a hole injection layer 3 is disposed on the upper side of substrate 1; anode 2 is disposed on the lower side of hole injection layer 3, and a hole transport layer 4 is disposed on the upper side of hole transport layer 3; hole injection layer 3 is disposed on the lower side of hole transport layer 4, and an organic light-emitting layer 5 is disposed on the upper side of hole transport layer 4; hole transport layer 4 is disposed on the lower side of organic light-emitting layer 5, and an organic sensitization layer 6 is disposed on the upper side of organic sensitization layer 6; organic light-emitting layer 5 is disposed on the lower side of organic sensitization layer 6, and an electron transport layer 7 is disposed on the upper side of organic transport layer 7; organic sensitization layer 6 is disposed on the lower side of electron transport layer 7, and an electron injection layer 8 is disposed on the upper side of electron injection layer 8; electron transport layer 7 is disposed on the lower side of electron injection layer 8, and a cathode 9 is disposed on the upper side of electron injection layer 8.

[0053] The positive terminal of the power supply is connected to the anode 2 of the organic electroluminescent device, and the negative terminal of the power supply is connected to the cathode 9 of the organic electroluminescent device.

[0054] The thickness of the organic light-emitting layer 5 is 1–100 nm, the thickness of the organic sensitizing layer 6 is 0.1–20 nm, and the thickness of the other layers can be the conventional thickness of these layers in the art.

[0055] When preparing the organic light-emitting layer 5, the organic light-emitting layer 5 is formed by co-evaporation of the host material source I and the light-emitting dye source; when preparing the organic sensitizing layer 6, the organic sensitizing layer 6 is formed by co-evaporation of the host material source II and the sensitizer material source.

[0056] The organic electroluminescent device of the present invention will be further described below through specific embodiments.

[0057] The method for preparing the organic electroluminescent device of the present invention includes the following steps:

[0058] The glass plate coated with the anode material was ultrasonically cleaned sequentially at room temperature using deionized water, acetone, isopropanol, semiconductor cleaning solution, deionized water (repeatedly using deionized water three times), and isopropanol. It was then dried in a clean environment until all moisture was removed. After plasma cleaning in a vacuum environment, the glass plate with anode 2 was placed in a vacuum chamber, and the vacuum was evacuated to less than 5 × 10⁻⁶. -4 Pa, a hole injection layer 3 is vacuum-deposited on the aforementioned anode 2-layer film at a deposition rate of 0.1–0.5 nm / s; a hole transport layer 4 is vacuum-deposited on top of the hole injection layer 3 at a deposition rate of 0.1–0.5 nm / s; an organic light-emitting layer 5 of the device is vacuum-deposited on top of the hole transport layer 4, the organic light-emitting layer 5 comprising a host material I and a luminescent dye. Using a multi-source co-evaporation method, the deposition rate ratio of the host material I and the luminescent dye is adjusted to achieve a preset doping ratio for the dye; an organic sensitization layer 6 of the device is vacuum-deposited on top of the organic light-emitting layer 5, the organic sensitization layer 6 comprising a host material II and a sensitizer material. Using a multi-source co-evaporation method, the evaporation rate ratio of the host material II and the sensitizer material is adjusted to achieve a preset doping ratio for the dye. The electron transport layer 7 material of the device is vacuum-evaporated on the organic sensitization layer 6 at a evaporation rate of 0.1–0.5 nm / s. LiF is vacuum-evaporated on the electron transport layer 7 at a rate of 0.1–0.5 nm / s as the electron injection layer 8, and Al layer is vacuum-evaporated at a rate of 0.1–1 nm / s as the cathode 9 of the device.

[0059] The structural formulas of some organic materials used in the embodiments of this invention are as follows:

[0060]

[0061] Example 1

[0062] The device structure in this embodiment is as follows:

[0063] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BNCz-pTPA:mCBP(10nm) / 20wt%TBCz-XT:PPF(2nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0064] In this embodiment, the anode is ITO; the hole injection layer 3 is made of HATCN, with a total thickness of 5–30 nm, and 10 nm in this embodiment; the hole transport layer 4 is made of TAPC, with a total thickness of 5–500 nm, and 40 nm in this embodiment; the organic light-emitting layer 5 has a main material I of mCBP, and the luminescent dye is BNCz-pTPA, a thermally activated delayed fluorescence material with a doping concentration of 1 wt%, with a thickness of 1–100 nm, and 10 nm in this embodiment; the organic sensitization layer 6 has a main material II of PPF, and the sensitizing material is TBCz-XT, a thermally activated delayed fluorescence material with a doping concentration of 20 wt%, with a thickness of 0.1–20 nm, and 2 nm in this embodiment; the electron transport layer 7 is made of TmPyPB, with a thickness of 5–300 nm, and 40 nm in this embodiment; the electron injection layer 8 and the cathode 9 are made of LiF (1 nm) and aluminum (120 nm).

[0065] The device embodiments 1 to 12 and comparative examples 1 to 5 of the present invention were completed according to the above preparation steps and testing methods. The specific device structure design schemes are detailed in the following embodiments.

[0066] Example 2

[0067] The device structure in this embodiment is as follows:

[0068] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BNCz-pTPA:mCBP(10nm) / 20wt%DMAC-DPS:PPF(2nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0069] The device has a similar function to that in Example 1, except that the sensitizer material is different.

[0070] Example 3

[0071] The device structure in this embodiment is as follows:

[0072] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%v-DABNA:mCBP(10nm) / 20wt%DMAC-DPS:PPF(2nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0073] Its device significance is roughly the same as that of Example 2, the difference being the different luminescent dye.

[0074] Example 4

[0075] The device structure in this embodiment is as follows:

[0076] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%v-DABNA:mCBP(10nm) / 20wt%mCP-BP-SFAC:PPF(2nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0077] The device has a similar function to that in Example 3, except that the sensitizer material is different.

[0078] Example 5

[0079] The device structure in this embodiment is as follows:

[0080] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%t-DABNA:mCBP(10nm) / 20wt%DMAC-DPS:PPF(2nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0081] Its device significance is roughly the same as that of Example 2, the difference being the different luminescent dye.

[0082] Example 6

[0083] The device structure in this embodiment is as follows:

[0084] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%t-DABNA:mCBP(10nm) / 15wt%Cz-XT:PPF(2nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0085] The device has the same meaning as in Example 5, the difference being the sensitizer material.

[0086] Example 7

[0087] The device structure in this embodiment is as follows:

[0088] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BN2:mCBP(10nm) / 30wt%BDMAC-XT:CBP(2nm) / TmPyPB(30nm) / LiF(1nm) / Al(120nm)

[0089] Its device significance is roughly the same as that of Example 1, the difference being the different luminescent dye and sensitizer materials.

[0090] Example 8

[0091] The device structure in this embodiment is as follows:

[0092] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BN2:mCBP(10nm) / 20wt%Ir(ppy)2acac:CBP(2nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0093] The device has the same meaning as in Example 7, the difference being the sensitizer material.

[0094] Example 9

[0095] The device structure in this embodiment is as follows:

[0096] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BN2:mCBP(10nm) / 20wt%Ir(ppy)2acac:DMIC-TRZ(2nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0097] Its device significance is roughly the same as that of Example 8, the difference being that the main material II is different.

[0098] Example 10

[0099] The device structure in this embodiment is as follows:

[0100] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BN3:mCBP(10nm) / 3wt%4CzTPNBu:CBP(2nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0101] Its device significance is roughly the same as that of Example 1, the difference being the different luminescent dye and sensitizer materials.

[0102] Example 11

[0103] The device structure in this embodiment is as follows:

[0104] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BN3:mCBP(10nm) / 20wt%PO-01-TB:CBP(2nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0105] The device has a similar function to that in Example 10, except that the sensitizer material is different.

[0106] Example 12

[0107] The device structure in this embodiment is as follows:

[0108] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BN3:mCBP(10nm) / 20wt%PO-01-TB:DMIC-TRZ(2nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0109] Its device significance is roughly the same as that of Example 11, the difference being that the main material II is different.

[0110] Comparative Example 1

[0111] The device structure in this comparative example is as follows:

[0112] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / mCP(10nm) / 1wt%BNCz-pTPA:mCBP(20nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0113] The significance of this device is that, compared with Examples 1 and 2, it is different in that it does not have the organic sensitization layer 6.

[0114] Comparative Example 2

[0115] The device structure in this comparative example is as follows:

[0116] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / mCBP(10nm) / 1wt%v-DABNA: mCBP(20nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0117] The significance of this device is that, compared with Examples 3-4, it lacks the organic sensitization layer 6.

[0118] Comparative Example 3

[0119] The device structure in this comparative example is as follows:

[0120] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / mCBP(10nm) / 1wt%t-DABNA:mCBP(20nm) / PPF(10nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0121] The significance of this device is that, compared with Examples 5 and 6, it is different in that it does not have the organic sensitization layer 6.

[0122] Comparative Example 4

[0123] The device structure in this comparative example is as follows:

[0124] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BN2:mCBP(20nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0125] The significance of this device is that, compared with Examples 7-9, it is different in that it does not have the organic sensitization layer 6.

[0126] Comparative Example 5

[0127] The device structure in this comparative example is as follows:

[0128] ITO / HATCN(10nm) / TAPC(40nm) / TCTA(10nm) / 1wt%BN3:mCBP(20nm) / TmPyPB(40nm) / LiF(1nm) / Al(120nm)

[0129] The significance of this device is that, compared with Examples 10-12, it is different in that it does not have the organic sensitization layer 6.

[0130] Table 1:

[0131]

[0132]

[0133] As shown in Table 1, compared with the corresponding comparative examples, the organic light-emitting device provided by the present invention has significantly higher maximum external quantum efficiency and external quantum efficiency at high brightness than the comparative examples. The turn-on voltage is also generally lower than that of the comparative examples, and the narrow half-width indicates better color purity, which proves the superior performance of the organic light-emitting device provided by the present invention.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0135] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0136] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0137] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0138] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0139] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An organic electroluminescent device, characterized in that, The device includes a substrate, an anode, a cathode, and an organic functional layer. The organic functional layer is disposed between the anode and the cathode. The organic functional layer includes a hole injection layer, a hole transport layer, an organic light-emitting layer, an organic sensitization layer, an electron transport layer, and an electron injection layer. The hole injection layer, hole transport layer, organic light-emitting layer, organic sensitization layer, electron transport layer, and electron injection layer are arranged sequentially from the anode to the cathode. The organic light-emitting layer includes a host material I and a light-emitting dye, and the organic sensitizing layer includes a host material II and a sensitizer material; The triplet energy level of the host material I is higher than that of the luminescent dye; the triplet energy level of the host material II is higher than that of the sensitizer material; the triplet energy level of the sensitizer material is higher than that of the luminescent dye. The luminescent dye is a multi-resonance thermally activated delayed fluorescence material; The core structure of the multiple resonance thermally activated delayed fluorescence material comprises one or more of carbon, boron, nitrogen, and oxygen atoms; the singlet energy level S1 and triplet energy level T1 of the multiple resonance thermally activated delayed fluorescence material satisfy: ΔEST = S1-T1 ≤ 0.4eV; the Stokes shift λ of the multiple resonance thermally activated delayed fluorescence material satisfies: λ≤60nm.

2. The organic electroluminescent device according to claim 1, characterized in that, The main material I includes compounds containing at least one group selected from carbazolyl, carbaolinyl, spirofluorenyl, fluorenyl, silyl, and phosphooxy groups; The main material II comprises a compound containing at least one group selected from carbazolyl, carbaolinyl, spirofluorenyl, fluorenyl, silyl, and phosphooxy groups.

3. The organic electroluminescent device according to claim 1, characterized in that, The sensitizer materials include thermally activated delayed fluorescence materials and phosphorescent materials.

4. The organic electroluminescent device according to claim 3, characterized in that The doping concentration of the multiple resonance thermally activated delayed fluorescence material in the organic light-emitting layer is from 0.1 wt% to 30 wt%, and the doping concentration of the sensitizer material in the organic sensitization layer is from 1 wt% to 100 wt%.

5. An organic electronic device using an organic electroluminescent device, characterized by The organic electronic device is provided with an organic electroluminescent device as described in any one of claims 1-4, and the organic electronic device includes an optical sensor, a solar cell, an illumination element, an organic thin-film transistor, an organic field-effect transistor, an organic thin-film solar cell, an information tag, an electronic artificial skin sheet, a sheet-type scanner, and electronic paper.

6. A display device of an organic electroluminescent device, characterized by The display device is provided with an organic electroluminescent device as described in any one of claims 1-4, and the display device is a display element, an illumination element, an information tag, an electronic artificial skin sheet, or electronic paper.

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