CN112952012B - Display panel and display device - Google Patents

Display panel and display device Download PDF

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CN112952012B
CN112952012B CN202110166356.2A CN202110166356A CN112952012B CN 112952012 B CN112952012 B CN 112952012B CN 202110166356 A CN202110166356 A CN 202110166356A CN 112952012 B CN112952012 B CN 112952012B
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CN112952012A (en
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吴勇
高荣荣
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BOE Technology Group Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/12—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising dopants
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H10K85/622—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing four rings, e.g. pyrene
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2101/00—Properties of the organic materials covered by group H10K85/00
    • H10K2101/40—Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract

The invention provides a display panel and a display device, which are used for solving the problem of low luminous efficiency of the display panel in the prior art. The display panel includes: a substrate, a first electrode positioned at one side of the substrate, a light-emitting layer positioned at one side of the first electrode away from the substrate, and a second electrode positioned at one side of the light-emitting layer away from the first electrode; the light-emitting layer comprises a first light-emitting part, a second light-emitting part and a third light-emitting part, wherein the light-emitting wavelength range of the first light-emitting part is larger than that of the second light-emitting part, the light-emitting wavelength range of the second light-emitting part is larger than that of the third light-emitting part, and at least the second light-emitting part comprises a main body part and an object part; the material of the main body part is a heat-activated delayed fluorescent material, and the difference value between the singlet excitation energy level and the triplet excitation energy level of the main body part is not more than 0.3eV; the main body portion contains an electron donating group and an electron accepting group.

Description

Display panel and display device
Technical Field
The present invention relates to the field of semiconductor technologies, and in particular, to a display panel and a display device.
Background
In general, a fluorescent light-emitting material generates singlet excitons and triplet excitons at a probability of 25:75 when excited by a current, wherein the singlet excitons are radiative and inactive to a ground state singlet state to emit fluorescence, but energy (T1) of the triplet excitons with high probability cannot be effectively used for light emission. However, the maximum theoretical limit of Internal Quantum Efficiency (IQE) is 25%, resulting in less than ideal performance of the OLED. OLED based on phosphorescent material luminophore can collect singlet state exciton and triplet state exciton fully to make IQE reach 100%. However, the phosphorescent material molecules require rare metal elements, resulting in increased cost of the OLED of the phosphorescent material and serious pollution, i.e., the related art display panel has a problem of low luminous efficiency.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for solving the problem of low luminous efficiency of the display panel in the prior art.
An embodiment of the present invention provides a display panel including: a substrate, a first electrode positioned at one side of the substrate, a light-emitting layer positioned at one side of the first electrode away from the substrate, and a second electrode positioned at one side of the light-emitting layer away from the first electrode; wherein, the liquid crystal display device comprises a liquid crystal display device,
the light-emitting layer comprises a first light-emitting part, a second light-emitting part and a third light-emitting part, wherein the light-emitting wavelength range of the first light-emitting part is larger than that of the second light-emitting part, the light-emitting wavelength range of the second light-emitting part is larger than that of the third light-emitting part, and at least the second light-emitting part comprises a main body part and an object part; the material of the main body part is a heat-activated delayed fluorescent material, and the difference value between the singlet excitation energy level and the triplet excitation energy level of the main body part is not more than 0.3eV; the main body part contains electron donating groups and electron accepting groups, wherein the electron donating groups comprise the following structural formulas:
Figure BDA0002933419220000021
the electron accepting group includes the following structural formula:
Figure BDA0002933419220000022
wherein A1 is selected from one of B, N, S, O, C, se, si, F; a2 is selected from one of B, N, S, O, C, se, si, F; a3 is selected from one of B, N, S, O, C, se, si, F; and at least one of A2 and A3 is B.
In one possible embodiment, the electron donating group comprises the following structural formula:
Figure BDA0002933419220000023
the electron accepting group includes the following structural formula:
Figure BDA0002933419220000031
wherein R1 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, C1-C8 aliphatic hydrocarbon group, C6-C30 aromatic hydrocarbon group, C3-C18 aromatic heterocyclic group, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r2 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r3 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r4 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl;
r5 is a connecting structure of the electron donating group and the electron accepting group, and comprises one or 2-3 groups formed by connecting the following groups:
a single bond;
benzene;
dibenzofuran;
dibenzothiophenes;
carborane;
r6 is one or a combination of the following:
cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r7 is one or a combination of the following:
cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r8 is one or a combination of the following:
cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r10 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl;
substituted or unsubstituted C2-C40-alkynyl;
a substituted or unsubstituted C6-C60-aryl group;
a substituted or unsubstituted C3-C57-heteroaryl;
a substituted or unsubstituted C1-C9-alkylene group;
substituted or unsubstituted C2-C8-alkenylene;
substituted or unsubstituted C2-C8-alkynylene;
arylene groups;
a single bond;
r11 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl;
substituted or unsubstituted C2-C40-alkynyl;
a substituted or unsubstituted C6-C60-aryl group;
a substituted or unsubstituted C3-C57-heteroaryl;
a substituted or unsubstituted C1-C9-alkylene group;
substituted or unsubstituted C2-C8-alkenylene;
substituted or unsubstituted C2-C8-alkynylene;
arylene groups;
a single bond;
r12 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl;
substituted or unsubstituted C2-C40-alkynyl;
a substituted or unsubstituted C6-C60-aryl group;
a substituted or unsubstituted C3-C57-heteroaryl;
a substituted or unsubstituted C1-C9-alkylene group;
substituted or unsubstituted C2-C8-alkenylene;
substituted or unsubstituted C2-C8-alkynylene;
arylene groups;
a single bond;
r13 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl;
substituted or unsubstituted C2-C40-alkynyl;
a substituted or unsubstituted C6-C60-aryl group;
a substituted or unsubstituted C3-C57-heteroaryl;
a substituted or unsubstituted C1-C9-alkylene group;
substituted or unsubstituted C2-C8-alkenylene;
substituted or unsubstituted C2-C8-alkynylene;
arylene groups;
a single bond.
In one possible embodiment, the main body portion is one of:
Figure BDA0002933419220000071
/>
Figure BDA0002933419220000081
/>
Figure BDA0002933419220000091
/>
Figure BDA0002933419220000101
/>
Figure BDA0002933419220000111
/>
Figure BDA0002933419220000121
/>
Figure BDA0002933419220000131
/>
Figure BDA0002933419220000141
/>
Figure BDA0002933419220000151
/>
Figure BDA0002933419220000161
/>
Figure BDA0002933419220000171
/>
Figure BDA0002933419220000181
in one possible embodiment, the second light emitting part includes only a first film layer, and the host part and the object part are located at the first film layer.
In a possible embodiment, the second light emitting part includes a second film layer and a third film layer located on a side of the second film layer facing away from the first electrode, wherein the host part and the object part are located on the third film layer; the third film layer emits green light, the second film layer emits blue light, and the blue light emitted by the second film layer is absorbed by the third film layer and excites the third film layer to emit green light.
In one possible embodiment, the overlap area of the absorption spectrum of the host portion of the third film layer and the electroluminescent spectrum of the guest portion of the second film layer is greater than 5%.
In one possible embodiment, the second film layer and the third light emitting portion are made of the same material.
In one possible embodiment, in the second light emitting portion, a difference between the triplet excited state level of the host portion and the triplet excited state level of the guest portion is greater than 0.2eV.
In one possible embodiment, the first electrode is an anode and the second electrode is a cathode; a hole injection layer is further arranged between the first electrode and the light-emitting layer, a hole transport layer is further arranged between the hole injection layer and the light-emitting layer, and an electron blocking layer is further arranged between the hole transport layer and the light-emitting layer; an electron injection layer is further arranged between the second electrode and the light-emitting layer, an electron transport layer is further arranged between the electron injection layer and the light-emitting layer, and a hole blocking layer is further arranged between the electron transport layer and the light-emitting layer;
the triplet excitation level of the host portion in the second light emitting portion is smaller than the triplet excitation level of the electron blocking layer;
the triplet excitation level of the main body portion in the second light emitting portion is smaller than the triplet excitation level of the hole blocking portion;
an absolute value of a difference between a HOMO level of the host portion and a HOMO level of the electron blocking layer in the second light emitting portion is not more than 0.3eV;
an absolute value of a difference between a HOMO level of the main body portion and a HOMO level of the hole blocking layer in the second light emitting portion is not less than 0.1eV;
the absolute value of the LUMO level of the main body portion in the second light-emitting portion is larger than the absolute value of the LUMO level of the hole blocking layer.
The embodiment of the invention also provides a display device comprising the display panel provided by the embodiment of the invention.
The embodiment of the invention has the following beneficial effects: in the embodiment of the present invention, the material of the main body of the second light emitting portion is a thermally activated delayed fluorescent material (TADF), and singlet excitons generated by the transition of the excitons of the TADF from the excited triplet state to the opposite triplet state of the excited singlet state emit fluorescence when the excitons transition to the ground singlet state, so that the light emitting efficiency of the display panel is greatly improved, the difference between the singlet excitation level S1 of the main body Host and the triplet excitation level T1 is not greater than 0.3eV, the main body portion contains an electron donating group and an electron accepting group, and the electron donating group and the electron accepting group satisfy the above structural formula, so that the light emitting efficiency of the second light emitting portion 52 can be improved, and the display panel has higher light emitting efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating performance testing of various embodiments according to an embodiment of the present invention;
FIG. 4 is a second schematic diagram of performance testing of various embodiments of the present invention;
FIG. 5 is a third exemplary diagram illustrating performance testing of various embodiments according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed description of known functions and known components.
Referring to fig. 1, an embodiment of the present invention provides a display panel including: a substrate 1, a first electrode 21 positioned on one side of the substrate 1, a light-emitting layer 5 positioned on one side of the first electrode 21 away from the substrate 1, and a second electrode 22 positioned on one side of the light-emitting layer 5 away from the first electrode 21; wherein, the liquid crystal display device comprises a liquid crystal display device,
the light emitting layer 5 includes a first light emitting portion 51, a second light emitting portion 52, and a third light emitting portion 53, the light emitting wavelength range of the first light emitting portion 51 is larger than the light emitting wavelength range of the second light emitting portion 52, the light emitting wavelength range of the second light emitting portion 52 is larger than the light emitting wavelength range of the third light emitting portion 53, specifically, the first light emitting portion 51 may be a light emitting portion emitting red light, the second light emitting portion 52 may be a light emitting portion emitting green light, the third light emitting portion may be a light emitting portion emitting blue light, and at least the second light emitting portion 52 includes a Host portion Host and an object portion Dopant; the material of the main body part is a heat-activated delayed fluorescent material (Thermally Activated Delayed Fluorescence, TADF), and the difference between the singlet excitation level S1 and the triplet excitation level T1 of the main body part Host is not more than 0.3eV, namely, S1-T1 is less than or equal to 0.3eV; the main body part contains an electron donating group Donor and an electron accepting group Accept, and the electron donating group Donor comprises the following structural formula:
Figure BDA0002933419220000211
the electron accepting group Accept comprises the following structural formula:
Figure BDA0002933419220000212
wherein A1 is selected from one of B, N, S, O, C, se, si, F; a2 is selected from one of B, N, S, O, C, se, si, F; a3 is selected fromB. N, S, O, C, se, si, F; and at least one of A2 and A3 is B. Specifically, A1 and A2 and A3 may be selected from one or two of B, N, S, O, C, se, si, F.
In the embodiment of the present invention, the material of the main body of the second light emitting portion 52 is a thermally activated delayed fluorescent material (Thermally Activated Delayed Fluorescence, TADF), and the excitons of TADF are singlet excitons generated by the transition from the excited triplet state to the opposite-direction system of the excited singlet state, and emit fluorescence when transitioning to the ground singlet state, so that the light emitting efficiency of the display panel is greatly improved, the difference between the singlet excitation level S1 of the main body Host and the triplet excitation level T1 is not greater than 0.3eV, the main body Host contains the electron donating group Donor and the electron accepting group Accept, and the electron donating group Donor and the electron accepting group Accept satisfy the structural formula, so that the light emitting efficiency of the second light emitting portion 52 can be improved, and the display panel has higher light emitting efficiency.
In one possible embodiment, in the second light emitting portion 52, the electron donating group Donor contained in the main body portion Host may include the following structural formula:
Figure BDA0002933419220000221
in the second light emitting portion 52, the electron accepting group Accept contained in the main body portion Host includes the following structural formula:
Figure BDA0002933419220000222
wherein R1 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, C1-C8 aliphatic hydrocarbon group, C6-C30 aromatic hydrocarbon group, C3-C18 aromatic heterocyclic group, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r2 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r3 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r4 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl;
r5 is a connection structure of an electron donating group and an electron accepting group, and comprises one or 2-3 groups formed by connection of the following components:
a single bond;
benzene;
dibenzofuran;
dibenzothiophenes;
carborane;
r6 is one or a combination of the following:
cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r7 is one or a combination of the following:
cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r8 is one or a combination of the following:
cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r10 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl;
substituted or unsubstituted C2-C40-alkynyl;
a substituted or unsubstituted C6-C60-aryl group;
a substituted or unsubstituted C3-C57-heteroaryl;
a substituted or unsubstituted C1-C9-alkylene group;
substituted or unsubstituted C2-C8-alkenylene;
substituted or unsubstituted C2-C8-alkynylene;
arylene groups;
a single bond;
r11 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl;
substituted or unsubstituted C2-C40-alkynyl;
a substituted or unsubstituted C6-C60-aryl group;
a substituted or unsubstituted C3-C57-heteroaryl;
a substituted or unsubstituted C1-C9-alkylene group;
substituted or unsubstituted C2-C8-alkenylene;
substituted or unsubstituted C2-C8-alkynylene;
arylene groups;
a single bond;
r12 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl;
substituted or unsubstituted C2-C40-alkynyl;
a substituted or unsubstituted C6-C60-aryl group;
a substituted or unsubstituted C3-C57-heteroaryl;
a substituted or unsubstituted C1-C9-alkylene group;
substituted or unsubstituted C2-C8-alkenylene;
substituted or unsubstituted C2-C8-alkynylene;
arylene groups;
a single bond;
r13 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl;
substituted or unsubstituted C2-C40-alkynyl;
a substituted or unsubstituted C6-C60-aryl group;
a substituted or unsubstituted C3-C57-heteroaryl;
a substituted or unsubstituted C1-C9-alkylene group;
substituted or unsubstituted C2-C8-alkenylene;
substituted or unsubstituted C2-C8-alkynylene;
arylene groups;
a single bond.
In one possible embodiment, in the second light emitting portion 52, the main body portion Host is one of:
Figure BDA0002933419220000271
/>
Figure BDA0002933419220000281
/>
Figure BDA0002933419220000291
/>
Figure BDA0002933419220000301
/>
Figure BDA0002933419220000311
/>
Figure BDA0002933419220000321
/>
Figure BDA0002933419220000331
/>
Figure BDA0002933419220000341
/>
Figure BDA0002933419220000351
/>
Figure BDA0002933419220000361
/>
Figure BDA0002933419220000371
/>
Figure BDA0002933419220000381
wherein B1-B27 represent the labels of the corresponding materials.
Characterization test:
the distribution between HOMO and LUMO units of TADF compounds can be obtained by molecular dynamics simulation and DFT simulation as shown in table 1 below, and the simulation results and experimental device performances are shown in table 2 below:
table 1:
Figure BDA0002933419220000391
wherein the larger black area represents the distribution area of the electron cloud;
TABLE 2
Compounds of formula (I) Abs(nm) PL(nm) S1(eV) T1(eV) ΔE ST (meV)
B1 415 496 2.508 2.485 23
B4 411 487 2.546 2.512 34
B8 412 487 2.546 2.514 32
B27 425 508 2.441 2.406 35
Where Abs represents the peak position of the absorption spectrum, PL represents the peak position of the photoluminescence wavelength, S1 represents the singlet excitation level, T1 represents the triplet excitation level, and Δest represents the difference between S1 and T1;
in a specific implementation, each of the first light emitting portion 51, the second light emitting portion 52, and the third light emitting portion 53 may include a host material and a guest material, where the host material included in the first light emitting portion 51 and the third light emitting portion 53 may be different from the host material included in the second light emitting portion 52, and the guest material included in the first light emitting portion 51 and the third light emitting portion 53 may be different from the guest material included in the second light emitting portion 52.
In implementation, as shown in fig. 1, the display panel may be a positive structure, for example, the first electrode 21 may be an anode, and the second electrode 22 may be a cathode; a hole injection layer 31 is further arranged between the first electrode 21 and the light-emitting layer 5, a hole transport layer 32 is further arranged between the hole injection layer 31 and the light-emitting layer 5, and an electron blocking layer 33 is further arranged between the hole transport layer 32 and the light-emitting layer 5; an electron injection layer 41 is further provided between the second electrode 22 and the light-emitting layer 5, an electron transport layer 42 is further provided between the electron injection layer 41 and the light-emitting layer 5, and a hole blocking layer 43 is further provided between the electron transport layer 42 and the light-emitting layer 5. Specifically, in implementation, the display panel may have an inverted structure, for example, the first electrode 21 may be a cathode, the second electrode 22 may be an anode, an electron injection layer 41 is further disposed between the first electrode 21 and the light-emitting layer 5, an electron transport layer 42 is further disposed between the electron injection layer 41 and the light-emitting layer 5, and a hole blocking layer 43 is further disposed between the electron transport layer 42 and the light-emitting layer 5; a hole injection layer 31 is further provided between the second electrode 22 and the light-emitting layer 5, a hole transport layer 32 is further provided between the hole injection layer 31 and the light-emitting layer 5, and an electron blocking layer 33 is further provided between the hole transport layer 32 and the light-emitting layer 5.
In one possible embodiment, as shown in connection with fig. 1, the second light emitting portion 52 includes only the first film layer 520, and both the main body portion and the object portion of the second light emitting portion 52 are located on the first film layer 520.
In one possible embodiment, referring to fig. 2, the second light emitting portion 52 includes a second film 521 and a third film 522 on a side of the second film 521 facing away from the first electrode 21, where the main body portion Host and the object portion Dopant of the second light emitting portion 52 are both located on the third film 522; the third film 522 emits green light, the second film 521 emits blue light, and the blue light emitted from the second film 521 is absorbed by the third film 522 and excites the third film 522 to emit green light. In the embodiment of the present invention, the second light emitting portion 52 includes a second film 521 and a third film 522 located on a side of the second film 521 facing away from the first electrode 21, the second film 521 emits blue light, and the blue light emitted from the second film 521 is absorbed by the third film 522 and excites the third film 522 to emit green light, and by exciting the third film 522 with the second film 521 emitting blue light with a short wavelength, the light emitting efficiency of the third film 522 can be enhanced, thereby improving the light emitting efficiency of the second light emitting portion 52.
In a specific implementation, the overlap area of the absorption spectrum of the host portion of the third film layer 522 and the electroluminescence spectrum of the guest portion of the second film layer 521 is greater than 5%.
In the embodiment, the second film 521 and the third light emitting portion 53 are made of the same material. In the embodiment of the invention, the second film 521 and the third light-emitting portion 53 are made of the same material, so that the second film 521 can be formed at the same time as the third light-emitting portion 53 is formed, thereby simplifying the manufacturing process of the display panel.
In one possible embodiment, in the second light emitting portion 52, the difference between the triplet excited state level T1 of the host portion and the triplet excited state level T1 of the guest portion is greater than 0.2eV, that is, T1 (TADF) -T1 (Dopant) > 0.2eV.
In the embodiment, as shown in fig. 1 or fig. 2, the first electrode 21 is an anode, and the second electrode 22 is a cathode; a hole injection layer 31 (HIL) is further provided between the first electrode 21 and the light-emitting layer 5, a hole transport layer 32 (HTL) is further provided between the hole injection layer 31 and the light-emitting layer 5, and an electron blocking layer 33 (EBL) is further provided between the hole transport layer 32 and the light-emitting layer 5; an electron injection layer 41 (EIL) is further provided between the second electrode 22 and the light-emitting layer 5, an electron transport layer 42 (EBL) is further provided between the electron injection layer 41 and the light-emitting layer 5, and a hole blocking layer 43 (HBL) is further provided between the electron transport layer 42 and the light-emitting layer 5; the triplet excitation level of the host portion in the second light emitting portion 52 is smaller than that of the electron blocking layer 33 (EBL), that is, T1 (EBL) > T1 (TADF); the triplet excitation level of the main body portion in the second light emitting portion 52 is smaller than that of the hole blocking portion 43 (HBL), that is, T1 (HBL) > T1 (TADF); the HOMO level of the main body portion of the second light-emitting portion 52 and the HOMO level of the electron blocking layer 33 (EBL)The absolute difference is not greater than 0.3eV, i.e.. HOMO TADF ∣-∣HOMO EBL The energy level gap (gap) can be reduced and the hole transmission can be increased by being less than or equal to 0.5 eV; the absolute value of the difference between the HOMO level of the main body portion in the second light-emitting portion 52 and the HOMO level of the hole-blocking layer 43 (HBL) is not less than 0.1eV, i.e., HOMO HBL ∣-∣HOMO TADF The energy of the electron is larger than or equal to 0.1eV, which is favorable for blocking holes; the absolute value of the LUMO level of the main body portion in the second light-emitting portion 52 is larger than that of the hole-blocking layer 43 (HBL) |lumo TADF ∣＞∣LUMO HBL And moreover, the electron transmission is facilitated. In the embodiment of the invention, the light-emitting area can be limited in the light-emitting layer to prevent the energy of the light-emitting layer from diffusing like the peripheral functional layer so as to further improve the light-emitting efficiency of the display panel.
In order to more clearly understand the display panel provided by the embodiment of the present invention, the following is specifically exemplified as follows:
specifically, the structure of the display panel includes: an Indium Tin Oxide (ITO) layer on a substrate (specifically, a glass substrate) is used as the first electrode 21 (anode), a hole injection layer 31 (HIL) (5 nm to 30 nm), a hole transport layer 32 (HTL) (100 nm to 2000 nm), an electron blocking layer 33 (EBL) (5 nm to 100 nm), an emission layer 5 (EML) (20 nm to 100 nm), a hole blocking layer 43 (HBL) (5 nm to 100 nm), an electron transport layer 42 (ETL) (20 nm to 100 nm), an electron injection layer 41 (EIL) (1 nm to 10 nm), and the second electrode 22 (cathode); the device structure is specifically expressed as: ITO/HIL/HTL/EBL/Host: dopant/HBL/ETL/EIL/cathode; specifically, the material of HIL may be: moO3, F4-TCNQ or HAT-CN: the material of the HTL may be: NPB, m-MTDATA, TPD or TAPC; the EBL may be: TCTA; in the light emitting layer 5 (EML), the Host material Host of the light emitting portion emitting red light (i.e., the first light emitting portion 51), the light emitting portion emitting green light (i.e., the second light emitting portion 52), and the light emitting portion emitting blue light (i.e., the third light emitting portion 53) may be selected from: mCBP, CBP, mCP, TCTA, DMQA, TPA the doping ratio of the guest material Dopant may be: 0.1 to 100wt%, specifically, 0.1 to 10 wt%; the HBL material may be: CBP, bphen or TPBI; the material of ETL may be: tmPyPB or B4PyPPM; the EIL material may be: liF, yb or LiQ; the cathode material may be: mg or Ag;
specifically, the following device structures were prepared separately:
embodiment one:
ITO/HIL (5 nm)/HTL (40 nm)/EBL (5 nm)/BH: BD (8 wt%,15 nm)/compound B27: GD (5 wt%,20 nm)/RH: RD (5 wt%,15 nm)/HBL (5 nm)/ETL (40 nm)/EIL (1 nm)/cathode (100 nm); wherein, BH: BD (8 wt%) represents a light emitting portion emitting blue light, that is, the third light emitting portion 53, the guest material BD accounts for a doping ratio of the total blue light emitting portion material, and the compound B27 represents a TBDF material corresponding to the reference symbol B27 listed above, wherein the doping ratio of the guest material accounts for 5wt% of the total green light emitting portion material, RH: RD (5 wt%) means that the doping ratio of the guest material RD to the total red light emitting portion material in the light emitting portion emitting red light, i.e., in the first light emitting portion 51 is 5wt%;
specifically, the HTL material may be:
Figure BDA0002933419220000431
the material of ETL may be:
Figure BDA0002933419220000432
the material of the electron blocking layer (EB) may be:
Figure BDA0002933419220000441
the host material (BH) in the light-emitting portion that emits blue light may be:
Figure BDA0002933419220000442
the guest material (BD) in the light emitting portion that emits blue light may be:
Figure BDA0002933419220000451
the guest material (GD) in the light-emitting portion that emits green light may be:
Figure BDA0002933419220000452
the guest material (RD) in the light emitting portion emitting red light may be:
Figure BDA0002933419220000461
the electron injection layer material (EIL) may be:
Figure BDA0002933419220000462
comparative example 1:
the device fabrication process was the same as example 1 except that compound B27 in the light emitting layer was replaced with mCBP;
comparative example 2:
the device fabrication process was the same as that of example 1 except that the structure of the light emitting layer shown in fig. 1 in example 1 was replaced with fig. 2;
example 2:
the device preparation procedure was the same as in example 1 except that the doping ratio of BD in example 1 was changed to 10 wt%;
example 3:
the same as in example 1 was prepared except that the doping ratio of GD in example 1 was changed to 8 wt%;
the performance comparisons of the examples are shown in table 3 below, and in figures 3, 4 and 5:
V on (eV) CE(cd/B) PE(lm/W) EQE CIE LT 95
example 1 2.6 66.4 73.6 21.7 (0.36，0.41) 100％
Comparative example 1 2.5 51.6 62.8 17.2 (0.36，0.41) 40％
Comparative example 2 2.6 74.8 79.7 21.2 (0.36，0.41) 84％
Example 2 2.6 57.7 59.7 18.5 (0.38，0.41) 86％
Example 3 2.6 61.8 66.6 20.8 (0.39，0.41) 93％
Wherein Von represents the on-voltage, CE represents the current efficiency, PE represents the light-emitting efficiency, EQE represents the external quantum efficiency, CIE represents the color coordinates, LT 95 The lifetime ratio at which luminance decays from 100% to 95% is expressed, where the lifetime ratio can be understood as being based on the lifetime of example 1, and the lifetime of other device structures is a ratio to the reference.
The embodiment of the invention also provides a display device which comprises the display panel provided by the embodiment of the invention.
The embodiment of the invention has the following beneficial effects: in the embodiment of the present invention, the material of the main body of the second light emitting portion 52 is a thermally activated delayed fluorescent material, and the singlet excitons generated by the transition of the excitons of TADF from the excited triplet state to the opposite triplet state of the excited singlet state emit fluorescence when the transition is performed to the ground singlet state, so that the light emitting efficiency of the display panel is greatly improved, the difference between the singlet excitation level S1 of the main body Host and the triplet excitation level T1 is not greater than 0.3eV, the main body Host contains the electron donating group Donor and the electron accepting group Accept, and the electron donating group Donor and the electron accepting group Accept satisfy the above structural formula, so that the light emitting efficiency of the second light emitting portion 52 can be improved, and the display panel has higher light emitting efficiency.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (9)

1. A display panel, comprising: a substrate, a first electrode positioned at one side of the substrate, a light-emitting layer positioned at one side of the first electrode away from the substrate, and a second electrode positioned at one side of the light-emitting layer away from the first electrode; wherein, the liquid crystal display device comprises a liquid crystal display device,
the light-emitting layer comprises a first light-emitting part, a second light-emitting part and a third light-emitting part, wherein the light-emitting wavelength range of the first light-emitting part is larger than that of the second light-emitting part, the light-emitting wavelength range of the second light-emitting part is larger than that of the third light-emitting part, and at least the second light-emitting part comprises a main body part and an object part; the material of the main body part is a heat-activated delayed fluorescent material, and the difference value between the singlet excitation energy level and the triplet excitation energy level of the main body part is not more than 0.3eV; the main body part contains electron donating groups and electron accepting groups, wherein the electron donating groups comprise the following structural formulas:
Figure FDA0004048264620000011
the electron accepting group includes the following structural formula:
Figure FDA0004048264620000012
wherein A1 is selected from one of B, N, S, O, C, se, si, FThe method comprises the steps of carrying out a first treatment on the surface of the A2 is selected from one of B, N, S, O, C, se, si, F; a3 is selected from one of B, N, S, O, C, se, si, F; and at least one of A2 and A3 is B;
the main body part also contains a connection structure R5 of the electron donating group and the electron accepting group, wherein the R5 comprises one or 2-3 groups formed by connecting the following components:
a single bond;
benzene;
dibenzofuran;
dibenzothiophenes;
carborane;
the first electrode is an anode, and the second electrode is a cathode; a hole injection layer is further arranged between the first electrode and the light-emitting layer, a hole transport layer is further arranged between the hole injection layer and the light-emitting layer, and an electron blocking layer is further arranged between the hole transport layer and the light-emitting layer; an electron injection layer is further arranged between the second electrode and the light-emitting layer, an electron transport layer is further arranged between the electron injection layer and the light-emitting layer, and a hole blocking layer is further arranged between the electron transport layer and the light-emitting layer;
the triplet excitation level of the host portion in the second light emitting portion is smaller than the triplet excitation level of the electron blocking layer;
the triplet excitation level of the main body portion in the second light emitting portion is smaller than the triplet excitation level of the hole blocking portion;
an absolute value of a difference between a HOMO level of the host portion and a HOMO level of the electron blocking layer in the second light emitting portion is not more than 0.3eV;
an absolute value of a difference between a HOMO level of the main body portion and a HOMO level of the hole blocking layer in the second light emitting portion is not less than 0.1eV;
the absolute value of the LUMO level of the main body portion in the second light-emitting portion is larger than the absolute value of the LUMO level of the hole blocking layer.
2. The display panel of claim 1, wherein the electron donating group comprises the following structural formula:
Figure FDA0004048264620000021
the electron accepting group includes the following structural formula:
Figure FDA0004048264620000031
wherein R1 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, C1-C8 aliphatic hydrocarbon group, C6-C30 aromatic hydrocarbon group, C3-C18 aromatic heterocyclic group, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r2 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r3 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r4 is a single bond, carbazole, diphenylamino, phenoxazine, phenothiazine, dibenzoazasilaine, pyrrolidine, piperidine, benzene oxide, methoxy, aliphatic hydrocarbon groups of C1-C8, aromatic hydrocarbon groups of C6-C30, aromatic heterocyclic groups of C3-C18, substituted C6-C36 aryl or unsubstituted C6-C36 aryl; r6 is one or a combination of the following:
cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r7 is one or a combination of the following: cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r8 is one or a combination of the following: cyano group;
pyrazole;
imidazole;
triazole;
pyridine;
pyrimidine;
triazine;
aza-carbazole;
aza-dibenzofurans;
aza-dibenzothiophene groups;
a C1-C18 linear alkyl group;
C1-C18 branched substituted alkylene;
C2-C8 alkenylene;
C2-C8 alkynylene;
a single bond;
r10 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl; substituted or unsubstituted C2-C40-alkynyl; a substituted or unsubstituted C6-C60-aryl group; a substituted or unsubstituted C3-C57-heteroaryl; a substituted or unsubstituted C1-C9-alkylene group; substituted or unsubstituted C2-C8-alkenylene; substituted or unsubstituted C2-C8-alkynylene; arylene groups;
a single bond;
r11 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl; substituted or unsubstituted C2-C40-alkynyl; a substituted or unsubstituted C6-C60-aryl group; a substituted or unsubstituted C3-C57-heteroaryl; a substituted or unsubstituted C1-C9-alkylene group; substituted or unsubstituted C2-C8-alkenylene; substituted or unsubstituted C2-C8-alkynylene; arylene groups;
a single bond;
r12 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl; substituted or unsubstituted C2-C40-alkynyl; a substituted or unsubstituted C6-C60-aryl group; a substituted or unsubstituted C3-C57-heteroaryl; a substituted or unsubstituted C1-C9-alkylene group; substituted or unsubstituted C2-C8-alkenylene; substituted or unsubstituted C2-C8-alkynylene; arylene groups;
a single bond;
r13 is one or a combination of the following:
substituted or unsubstituted C2-C40-alkenyl; substituted or unsubstituted C2-C40-alkynyl; a substituted or unsubstituted C6-C60-aryl group; a substituted or unsubstituted C3-C57-heteroaryl; a substituted or unsubstituted C1-C9-alkylene group; substituted or unsubstituted C2-C8-alkenylene; substituted or unsubstituted C2-C8-alkynylene; arylene groups;
a single bond.
3. The display panel of claim 1, wherein the main body portion is one of:
Figure FDA0004048264620000071
/>
Figure FDA0004048264620000081
/>
Figure FDA0004048264620000091
/>
Figure FDA0004048264620000101
/>
Figure FDA0004048264620000111
/>
Figure FDA0004048264620000121
/>
Figure FDA0004048264620000131
/>
Figure FDA0004048264620000141
/>
Figure FDA0004048264620000151
/>
Figure FDA0004048264620000161
/>
Figure FDA0004048264620000171
/>
Figure FDA0004048264620000181
4. a display panel according to any one of claims 1-3, wherein the second light emitting portion comprises only a first film layer, and the host portion and the guest portion are located in the first film layer.
5. The display panel of any one of claims 1-3, wherein the second light emitting portion comprises a second film layer and a third film layer on a side of the second film layer facing away from the first electrode, wherein the host portion and the guest portion are located on the third film layer; the third film layer emits green light, the second film layer emits blue light, and the blue light emitted by the second film layer is absorbed by the third film layer and excites the third film layer to emit green light.
6. The display panel of claim 5, wherein an overlap area of an absorption spectrum of the host portion of the third film layer and an electroluminescence spectrum of the guest portion of the second film layer is greater than 5%.
7. The display panel of claim 6, wherein the second film layer and the third light-emitting portion are the same material.
8. The display panel according to claim 1, wherein in the second light-emitting portion, a difference between a triplet excited state level of the host portion and a triplet excited state level of the guest portion is greater than 0.2eV.
9. A display device comprising the display panel according to any one of claims 1-8.
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