Full-color display

Abstract

A full color display is disclosed. The novel full-color display comprises a plurality of pixel units, each pixel unit at least comprises four sub-pixels, and at least one sub-pixel is a sensitized device with the maximum emission wavelength larger than 500 nm. According to the invention, through collaborative optimization of the performance of each sensitized sub-pixel, double significant improvement of the full-color display color gamut range and the photoelectric conversion efficiency is realized, and then the full-color pixel unit with three core characteristics of high luminous efficiency, long service life and high color purity is obtained.

Description

Technical Field

[0001] The present invention relates to a full-color display comprising a plurality of pixel units, wherein at least one sub-pixel is a sensitizer having a maximum emission wavelength of photoluminescence spectrum greater than 500 nm. Background Technology

[0002] Organic light-emitting diodes (OLEDs) consist of a cathode, an anode, and a series of organic light-emitting materials stacked between the cathode and anode. They can convert electrical energy into light by applying a voltage across the cathode and anode, and have advantages such as wide viewing angle, high contrast, and faster response time. In 1987, Tang and Van Slyke of Eastman Kodak reported an organic light-emitting device comprising an arylamine hole transport layer and a tri-8-hydroxyquinoline-aluminum layer as the electron transport layer and the light-emitting layer (Applied Physics Letters, 1987, 51(12): 913-915). This invention laid the foundation for the development of modern organic light-emitting diodes (OLEDs).

[0003] OLEDs can be classified into three types based on their light-emitting mechanism: fluorescence, phosphorescence, and thermally activated delayed fluorescence (TADF). According to spin statistics, fluorescent OLEDs have a 25% singlet exciton ratio (S1), which emits fluorescence directly based on the radiative transition of singlet excitons. Fluorescent OLEDs have a 75% triplet exciton ratio (T1), but triplet excitons dissipate through non-radiative pathways, resulting in low exciton utilization and a high efficiency bottleneck; the theoretical maximum internal quantum efficiency (IQE) is 25%. Phosphorescent OLEDs convert triplet excitons into light emission through strong spin-orbit coupling of heavy metal atoms, achieving 100% exciton utilization (both S1 and T1 excitons can emit light), with a theoretical IQE of 100%. Due to its high efficiency, the discovery and development of phosphorescent OLEDs directly contributed to the commercialization of active-matrix OLEDs (AMOLEDs). Currently, one factor limiting the lifespan and power consumption of AMOLED displays is the lack of commercially available blue phosphorescent OLEDs with saturated CIE coordinates. Thermally activated delayed fluorescence (TADF) OLEDs were first realized and reported by Adachi, achieving a small singlet-triplet bandgap ΔE through molecular design. st The triplet exciton emits light after being thermally activated by reverse system crossing (RISC) to the singlet state (S1). Theoretically, it can achieve 100% exciton utilization and is considered to be the third generation of organic electroluminescent materials after traditional fluorescent and phosphorescent materials.

[0004] OLEDs can also be categorized into small-molecule OLEDs and polymer OLEDs based on the form of the materials used. Small-molecule OLEDs refer to any organic or organometallic material that is not a polymer. As long as it has a precise structure, the molecular weight of a small molecule can be very large; for example, dendritic polymers with a well-defined structure are considered small molecules. Polymer OLEDs include conjugated polymers and non-conjugated polymers with side-chain luminescent groups. If post-polymerization occurs during manufacturing, small-molecule OLEDs can also become polymer OLEDs. Among the various existing OLED manufacturing methods, small-molecule OLEDs are typically manufactured using vacuum thermal evaporation, while polymer OLEDs are manufactured using solution methods, such as spin coating and inkjet printing. If the material can be dissolved or dispersed in a solvent, small-molecule OLEDs can also be manufactured using solution methods.

[0005] For a long time, how to prepare full-color pixels with high efficiency, long lifespan, and better color purity has been a key research focus in this field. Domestic and international research teams have gradually shifted towards using full-color pixels with RGB (red, green, and blue sub-pixels). Currently, pixels with three RGB sub-pixels suffer from problems such as a short lifespan for the blue sub-pixel, poor color purity for the green and red sub-pixels, and slightly lower efficiency. Some researchers have proposed using RGBB pixels with two blue sub-pixels to compensate for the short lifespan of the blue light. However, the problem of poor color purity for the green and red sub-pixels remains to be solved. Based on the above research, this application proposes using sensitized sub-pixels containing at least one photoluminescence emission wavelength ≥500nm, applying the emerging RG sensitization technology to RGBB research to address the issues of poor color purity and slightly lower efficiency for the green and red sub-pixels. Of course, this technology will be updated as it develops.

[0006] Therefore, how to obtain full-color pixels with better performance, such as high efficiency, long lifespan, and better color purity, remains an urgent problem to be studied and solved. Summary of the Invention

[0007] This invention aims to provide a novel full-color display comprising multiple pixel units, each pixel unit containing at least four sub-pixels, and at least one sub-pixel being a photoluminescence sensitizer with a maximum emission wavelength greater than 500 nm. By synergistically optimizing the performance of each sensitized sub-pixel, this invention achieves a significant improvement in both the color gamut and photoelectric conversion efficiency of the full-color display, resulting in a full-color pixel unit possessing three core characteristics: high luminous efficiency, long lifespan, and high color purity.

[0008] According to an embodiment of the present invention, a full-color display is disclosed, comprising a plurality of pixel units, wherein each pixel unit comprises at least a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, and each sub-pixel comprises at least one light-emitting layer;

[0009] The first sub-pixel includes at least a first light-emitting layer, and the first light-emitting layer includes at least a first sensitizer and a first light-emitting material;

[0010] The second sub-pixel includes at least a second light-emitting layer, and the second light-emitting layer includes at least a second light-emitting material;

[0011] The third sub-pixel includes at least a third light-emitting layer, and the third light-emitting layer includes at least a third light-emitting material;

[0012] The fourth sub-pixel includes at least a fourth light-emitting layer, and the fourth light-emitting layer includes at least a fourth light-emitting material;

[0013] The maximum emission wavelength of the photoluminescence spectrum of the first luminescent material is 500-700 nm.

[0014] This invention discloses a novel full-color display comprising multiple pixel units, each pixel unit containing at least four sub-pixels, and at least one sub-pixel being a sensitizer with a maximum emission wavelength greater than 500 nm. By implementing a hierarchical configuration of sub-pixel sensitizers from single-factor to full-factor, this sub-pixel significantly improves the overall performance of the pixel unit, including color gamut display effect and photoelectric conversion efficiency, thereby producing a full-color pixel with high efficiency, long lifespan, and high color purity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an organic light-emitting device that may contain typical organic electroluminescent devices.

[0016] Figure 2 This is a schematic diagram of another organic light-emitting device that may contain typical organic electroluminescent devices.

[0017] Figure 3 This is a schematic diagram of the number of layers in an analog device.

[0018] Figure 4-6 This is a schematic diagram of the sub-pixels that a full-color display may contain, as disclosed in this article. Detailed Implementation

[0019] OLEDs can be manufactured on various substrates, such as glass, plastic, and metal. Figure 1An organic light-emitting device 100 is illustrated schematically and non-limitingly. The figures are not necessarily drawn to scale, and some layer structures may be omitted as needed. Device 100 may include a substrate 101, an anode 110, a hole injection layer 120, a hole transport layer 130, an electron blocking layer 140, a light-emitting layer 150, a hole blocking layer 160, an electron transport layer 170, an electron injection layer 180, and a cathode 190. Device 100 can be fabricated by sequentially depositing the described layers. The properties and functions of each layer, as well as exemplary materials, are described in more detail in columns 6-10 of U.S. Patent 7,279,704B2, the entire contents of which are incorporated herein by reference.

[0020] Each of these layers has numerous examples. For instance, a flexible and transparent substrate-anode combination is disclosed in U.S. Patent No. 5,844,363, which is incorporated herein by reference in its entirety. An example of a p-doped hole transport layer is m-MTDATA doped with F4-TCNQ at a molar ratio of 50:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated herein by reference in its entirety. An example of a host material is disclosed in U.S. Patent No. 6,303,238 to Thompson et al., which is incorporated herein by reference in its entirety. An example of an n-doped electron transport layer is BPhen doped with Li at a molar ratio of 1:1, as disclosed in U.S. Patent Application Publication No. 2003 / 0230980, which is incorporated herein by reference in its entirety. Examples of cathodes are disclosed in U.S. Patent Nos. 5,703,436 and 5,707,745, which are incorporated herein by reference in their entirety. These cathodes comprise composite cathodes having a thin metal layer, such as Mg:Ag, overlaid with a transparent, conductive, sputter-deposited ITO layer. The principles and use of barrier layers are described in more detail in U.S. Patent No. 6,097,147 and U.S. Patent Application Publication No. 2003 / 0230980, which are also incorporated herein by reference in their entirety. Examples of implantation layers are provided in U.S. Patent Application Publication No. 2004 / 0174116, which is also incorporated herein by reference in its entirety. A description of protective layers can be found in U.S. Patent Application Publication No. 2004 / 0174116, which is also incorporated herein by reference in its entirety.

[0021] The layered structure described above is provided through non-limiting embodiments. The functionality of an OLED can be achieved by combining the various layers described above, or some layers can be omitted entirely. It may also include other layers not explicitly described. Within each layer, a single material or a mixture of multiple materials can be used to achieve optimal performance. Any functional layer may include several sublayers. For example, a light-emitting layer may have two different light-emitting materials to achieve a desired emission spectrum.

[0022] like Figure 4-6This illustration is schematic and non-restrictive of the arrangement of multiple subpixels in a full-color display. A full-color display can contain four types of subpixels, and each subpixel can be arranged in different ways depending on the actual needs, such as in a square, in a row, or in other patterns; the shape of the subpixels can also be changed according to the actual needs, such as each subpixel can be a square, rectangle, triangle, or other shapes.

[0023] In one embodiment, an OLED can be described as having an "organic layer" disposed between a cathode and an anode. This organic layer may include one or more layers.

[0024] OLEDs also require an encapsulation layer, such as Figure 2 An organic light-emitting device 200 is shown schematically and non-limitingly, which is related to... Figure 1 The difference lies in the fact that an encapsulation layer 102 may also be included above the cathode 190 to protect against harmful substances from the environment, such as moisture and oxygen. Any material capable of providing encapsulation can be used as the encapsulation layer, such as glass or an organic-inorganic hybrid layer. The encapsulation layer should be placed directly or indirectly on the outside of the OLED device. Multilayer thin-film encapsulation is described in U.S. Patent 7,968,146B2, the entire contents of which are incorporated herein by reference.

[0025] Devices manufactured according to embodiments of the present invention can be incorporated into a variety of consumer products having one or more electronic component modules (or units). Some examples of such consumer products include flat panel displays, monitors, medical monitors, televisions, billboards, lights for indoor or outdoor lighting and / or signaling, head-up displays, fully or partially transparent displays, flexible displays, smartphones, tablet computers, phablets, wearable devices, smartwatches, laptop computers, digital cameras, portable camcorders, viewfinders, microdisplays, 3D displays, vehicle displays, and taillights.

[0026] The materials and structures described in this article can also be used in other organic electronic devices listed above.

[0027] As used herein, "top" means furthest from the substrate, and "bottom" means closest to the substrate. When the first layer is described as being "disposed" on the second layer, the first layer is positioned further away from the substrate. Unless it is specified that the first layer "contacts" the second layer, other layers may exist between the first and second layers. For example, even if various organic layers exist between the cathode and anode, the cathode may still be described as being "disposed" on the anode.

[0028] As used herein, the term "subpixel" includes an anode layer, a cathode layer, and one or more organic layers disposed between the anode layer and the cathode layer.

[0029] When a ligand is believed to directly contribute to the photosensitivity of the emitting material, the ligand can be called "photosensitive." When a ligand is believed not to contribute to the photosensitivity of the emitting material, the ligand can be called "auxiliary," but auxiliary ligands can alter the properties of photosensitivity ligands.

[0030] It is believed that the internal quantum efficiency (IQE) of fluorescent OLEDs can exceed the 25% spin statistical limit through delayed fluorescence. Delayed fluorescence can generally be divided into two types: P-type delayed fluorescence and E-type delayed fluorescence. P-type delayed fluorescence is generated by triplet-triplet annihilation (TTA).

[0031] On the other hand, E-type delayed fluorescence does not depend on the collision of two triplet states, but rather on the transition between triplet and singlet excited states. Compounds capable of producing E-type delayed fluorescence need to have a very small singlet-triple gap to facilitate the transition between energy states. Thermal energy can activate the transition from triplet to singlet. This type of delayed fluorescence is also called thermally activated delayed fluorescence (TADF). A significant characteristic of TADF is that the delayed component increases with increasing temperature. If the reverse system crossover (RISC) rate is fast enough to minimize the nonradiative decay from the triplet state, the fraction of singlet excited states that are refilled can reach 75%. The total singlet fraction can be 100%, far exceeding the 25% spin statistics of electrogenerated excitons.

[0032] E-type delayed fluorescence can be observed in excited complex systems or single compounds. Unbound by theory, it is believed that E-type delayed fluorescence requires the luminescent material to have a small singlet-triple bandgap (ΔE). S-T Organic, nonmetallic donor-acceptor luminescent materials may be able to achieve this. The emission of these materials is typically characterized as donor-acceptor charge transfer (CT) emission. Spatial separation of the HOMO and LUMO in these donor-acceptor compounds usually produces small ΔE. S-T These states can include CT states. Typically, donor-acceptor luminescent materials are constructed by linking an electron donor moiety (e.g., an amino or carbazole derivative) with an electron acceptor moiety (e.g., an N-containing six-membered aromatic ring).

[0033] Definition of the term "substituent group"

[0034] Halogens or halides—as used herein—include fluorine, chlorine, bromine, and iodine.

[0035] Alkyl – as used herein, includes straight-chain and branched alkyl groups. An alkyl group can be an alkyl group having 1 to 20 carbon atoms, preferably an alkyl group having 1 to 12 carbon atoms, and more preferably an alkyl group having 1 to 6 carbon atoms. Examples of alkyl groups include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecanyl, n-hexadecyl, n-heptadecyl, n-octadecyl, neopentyl, 1-methylpentyl, 2-methylpentyl, 1-pentylhexyl, 1-butylpentyl, 1-heptyloctyl, and 3-methylpentyl. Among the above, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, neopentyl, and n-hexyl are preferred. Additionally, the alkyl group may optionally be substituted.

[0036] Cycloalkyl – as used herein, comprises cyclic alkyl groups. The cycloalkyl group can be a cycloalkyl group having 3 to 20 carbon atoms, preferably a cycloalkyl group having 4 to 10 carbon atoms. Examples of cycloalkyl groups include cyclobutyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4,4-dimethylcyclohexyl, 1-adamantyl, 2-adamantyl, 1-norbornyl, 2-norbornyl, etc. Among the above, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, and 4,4-dimethylcyclohexyl are preferred. Furthermore, the cycloalkyl group may optionally be substituted.

[0037] Heteroalkyl – as used herein, a heteroalkyl group comprises one or more carbon atoms in an alkyl chain that are replaced by heteroatoms selected from the group consisting of nitrogen, oxygen, sulfur, selenium, phosphorus, silicon, germanium, and boron atoms. The heteroalkyl group can be a heteroalkyl group having 1 to 20 carbon atoms, preferably a heteroalkyl group having 1 to 10 carbon atoms, and more preferably a heteroalkyl group having 1 to 6 carbon atoms. Examples of heteroalkyl groups include methoxymethyl, ethoxymethyl, ethoxyethyl, methylthiomethyl, ethylthiomethyl, ethylthioethyl, methoxymethoxymethyl, ethoxymethoxymethyl, ethoxyethoxyethyl, hydroxymethyl, hydroxyethyl, hydroxypropyl, mercaptomethyl, mercaptoethyl, mercaptopropyl, aminomethyl, aminoethyl, aminopropyl, dimethylaminomethyl, trimethylgermanylmethyl, trimethylgermanylethyl, trimethylgermanylisopropyl, dimethylethylgermanylmethyl, dimethylisopropylgermanylmethyl, tert-butyldimethylgermanylmethyl, triethylgermanylmethyl, triethylgermanylethyl, triisopropylgermanylmethyl, triisopropylgermanylethyl, trimethylsilylmethyl, trimethylsilylethyl, trimethylsilylisopropyl, triisopropylsilylmethyl, triisopropylsilylethyl. Additionally, heteroalkyl groups may optionally be substituted.

[0038] Alkenyl – as used herein, encompasses straight-chain, branched, and cyclic olefinic groups. An alkenyl group can be an alkenyl group containing 2 to 20 carbon atoms, preferably an alkenyl group having 2 to 10 carbon atoms. Examples of alkenyl groups include vinyl, propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1,3-butadienyl, 1-methylvinyl, styryl, 2,2-diphenylvinyl, 1,2-diphenylvinyl, 1-methylallyl, 1,1-dimethylallyl, 2-methylallyl, 1-phenylallyl, 2-phenylallyl, 3-phenylallyl, 3,3-diphenylallyl, 1,2-dimethylallyl, 1-phenyl-1-butenyl, 3-phenyl-1-butenyl, cyclopentenyl, cyclopentadienyl, cyclohexenyl, cycloheptenyl, cyclohepttrienyl, cyclooctenyl, cyclooctatetraenyl, and norbornyl. In addition, the alkenyl group can be optionally substituted.

[0039] Alkynyl – as used herein, encompasses straight-chain alkynyl groups. An alkynyl group can be one containing 2 to 20 carbon atoms, preferably 2 to 10 carbon atoms. Examples of alkynyl groups include ethynyl, propynyl, propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, 2-pentynyl, 3,3-dimethyl-1-butynyl, 3-ethyl-3-methyl-1-pentynyl, 3,3-diisopropyl-1-pentynyl, phenylethynyl, phenylpropynyl, etc. Among the above, ethynyl, propynyl, propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, and phenylethynyl are preferred. Furthermore, the alkynyl group may be optionally substituted.

[0040] Aryl or aromatic group – as used herein, both non-fused and fused systems are considered. The aryl group can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, and more preferably an aryl group having 6 to 12 carbon atoms. Examples of aryl groups include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, fenene, fluorene, pyrene, etc. Perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene, and naphthalene. Examples of non-fused aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methyldiphenyl, 4”-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesitylene, and m-tetraphenyl. Additionally, the aryl group may optionally be substituted.

[0041] Heterocyclic groups or heterocycles – as used herein, consider non-aromatic cyclic groups. Non-aromatic heterocyclic groups include saturated heterocyclic groups having 3-20 ring atoms and unsaturated non-aromatic heterocyclic groups having 3-20 ring atoms, wherein at least one ring atom is selected from the group consisting of nitrogen, oxygen, sulfur, selenium, silicon, phosphorus, germanium, and boron atoms. Preferred non-aromatic heterocyclic groups are those having 3 to 7 ring atoms, including at least one heteroatom such as nitrogen, oxygen, silicon, or sulfur. Examples of non-aromatic heterocyclic groups include ethylene oxide, oxetane, tetrahydrofuranyl, tetrahydropyranyl, dioxopentacyclic, dioxahexacyclic, acridineyl, dihydropyrroleyl, tetrahydropyrroleyl, piperidinyl, oxazolidinyl, morpholinyl, piperazineyl, oxetane-heptanetrienyl, thioheptanetrienyl, azirane-heptanetrienyl, and tetrahydrothiorroleyl. In addition, the heterocyclic group can be optionally substituted.

[0042] Heteroaryl – as used herein – can be a non-fused or fused heteroaryl group comprising 1 to 5 heteroatoms, wherein at least one heteroatom is selected from the group consisting of nitrogen, oxygen, sulfur, selenium, silicon, phosphorus, germanium, and boron. Isoaryl also refers to heteroaryl. Heteroaryl can be a heteroaryl having 3 to 30 carbon atoms, preferably a heteroaryl having 3 to 20 carbon atoms, and more preferably a heteroaryl having 3 to 12 carbon atoms. Suitable heteroaryl groups include dibenzothiophene, dibenzofuran, dibenzoselenophene, furan, thiophene, benzofuran, benzothiophene, benzoselenophene, carbazole, indolecarbazole, pyridineindole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxtriazole, dioxazole, thiadiazol, pyridine, pyrazine, pyrazine, triazine, oxazine, oxthiazine, oxadiazine, indole, benzimidazole, indazole, indoxazine, benzoxazole, benzoisoxazole, benzothiazole, quinoline, isoquinoline Phosphine, cyclophosphine, quinazoline, quinoxaline, naphthidine, phthalazine, pteridine, xanthan, acridine, phenazine, phenothiazine, benzofuranopyridine, furanodipyridine, benzothiophenopyridine, thiophenodipyridine, benzoselenophenopyridine, selenobenzodipyridine, preferably dibenzothiophene, dibenzofuran, dibenzoselenophene, carbazole, indolocarbazole, imidazole, pyridine, triazine, benzimidazole, 1,2-azaborane, 1,3-azaborane, 1,4-azaborane, boronazole and its aza analogues. Additionally, the heteroaryl group may optionally be substituted.

[0043] Alkoxy groups—as used herein—are represented by -O-alkyl, -O-cycloalkyl, -O-heteroalkyl, or -O-heterocyclic groups. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl, and heterocyclic groups are the same as described above. An alkoxy group can be an alkoxy group having 1 to 20 carbon atoms, preferably an alkoxy group having 1 to 6 carbon atoms. Examples of alkoxy groups include methoxy, ethoxy, propoxy, butoxy, pentoxy, hexoxy, cyclopropyloxy, cyclobutyloxy, cyclopentoxy, cyclohexyloxy, tetrahydrofuranyloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy, and ethoxymethyloxy. Additionally, alkoxy groups may optionally be substituted.

[0044] Aryloxy group – as used herein, is represented by -O-aryl or -O-heteroaryl. Examples and preferred examples of aryl and heteroaryl groups are the same as described above. The aryloxy group can be an aryloxy group having 6 to 30 carbon atoms, preferably an aryloxy group having 6 to 20 carbon atoms. Examples of aryloxy groups include phenoxy and biphenyloxy groups. Additionally, the aryloxy group may optionally be substituted.

[0045] Arylalkyl – as used herein, encompasses aryl-substituted alkyl groups. An arylalkyl group can be an arylalkyl group having 7 to 30 carbon atoms, preferably an arylalkyl group having 7 to 20 carbon atoms, and more preferably an arylalkyl group having 7 to 13 carbon atoms. Examples of arylalkyl groups include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, 2-phenylisopropyl, phenyl tert-butyl, α-naphthylmethyl, 1-α-naphthyl-ethyl, 2-α-naphthylethyl, 1-α-naphthylisopropyl, 2-α-naphthylisopropyl, β-naphthylmethyl, 1-β-naphthyl-ethyl, 2-β-naphthyl-ethyl, 1-β-naphthylisopropyl, 2-β-naphthylisopropyl, p-methylbenzyl, m-methylbenzyl The compounds include alkyl groups, such as o-methylbenzyl, p-chlorobenzyl, m-chlorobenzyl, o-chlorobenzyl, p-bromobenzyl, m-bromobenzyl, o-bromobenzyl, p-iodobenzyl, m-iodobenzyl, o-iodobenzyl, p-hydroxybenzyl, m-hydroxybenzyl, o-hydroxybenzyl, p-aminobenzyl, m-aminobenzyl, o-aminobenzyl, p-nitrobenzyl, m-nitrobenzyl, o-nitrobenzyl, p-cyanobenzyl, m-cyanobenzyl, o-cyanobenzyl, 1-hydroxy-2-phenylisopropyl, and 1-chloro-2-phenylisopropyl. Among the above, benzyl, p-cyanobenzyl, m-cyanobenzyl, o-cyanobenzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylisopropyl, and 2-phenylisopropyl are preferred. Additionally, the alkyl group may optionally be substituted.

[0046] Alkylsilyl – as used herein, encompasses alkyl-substituted silyl groups. The alkylsilyl group can be an alkylsilyl group having 3 to 20 carbon atoms, preferably an alkylsilyl group having 3 to 10 carbon atoms. Examples of alkylsilyl groups include trimethylsilyl, triethylsilyl, methyldiethylsilyl, ethyldimethylsilyl, tripropylsilyl, tributylsilyl, triisopropylsilyl, methyldiisopropylsilyl, dimethylisopropylsilyl, tritert-butylsilyl, triisobutylsilyl, dimethyltert-butylsilyl, and methylditert-butylsilyl. Furthermore, the alkylsilyl group may optionally be substituted.

[0047] Arylsilane – as used herein, encompasses at least one aryl-substituted silane group. The arylsilane can be an arylsilane having 6 to 30 carbon atoms, preferably an arylsilane having 8 to 20 carbon atoms. Examples of arylsilanes include triphenylsilyl, phenyldiphenylsilyl, diphenylbiphenylsilyl, phenyldiethylsilyl, diphenylethylsilyl, phenyldimethylsilyl, diphenylmethylsilyl, phenyldiisopropylsilyl, diphenylisopropylsilyl, diphenylbutylsilyl, diphenylisobutylsilyl, and diphenyltert-butylsilyl. Additionally, the arylsilane may optionally be substituted.

[0048] Alkylgermanium group – as used herein, encompasses alkyl-substituted germanium groups. The alkylgermanium group can be an alkylgermanium group having 3 to 20 carbon atoms, preferably an alkylgermanium group having 3 to 10 carbon atoms. Examples of alkylgermanium groups include trimethylgermanium, triethylgermanium, methyldiethylgermanium, ethyldimethylgermanium, tripropylgermanium, tributylgermanium, triisopropylgermanium, methyldiisopropylgermanium, dimethylisopropylgermanium, tritert-butylgermanium, triisobutylgermanium, dimethyltert-butylgermanium, and methylditert-butylgermanium. Furthermore, the alkylgermanium group may optionally be substituted.

[0049] Arylgermanium – as used herein, encompasses a germanium group substituted with at least one aryl or heteroaryl group. The arylgermanium group can be an arylgermanium group having 6 to 30 carbon atoms, preferably an arylgermanium group having 8 to 20 carbon atoms. Examples of arylgermanium groups include triphenylgermanium, phenyldiphenylgermanium, diphenylbiphenylgermanium, phenyldiethylgermanium, diphenylethylgermanium, phenyldimethylgermanium, diphenylmethylgermanium, phenyldiisopropylgermanium, diphenylisopropylgermanium, diphenylbutylgermanium, diphenylisobutylgermanium, and diphenyltert-butylgermanium. Additionally, the arylgermanium group may optionally be substituted.

[0050] The term "aza" in azadibenzofuran, azadibenzothiophene, etc., refers to the substitution of one or more CH groups in the corresponding aromatic segment by a nitrogen atom. For example, azatriphenylene includes dibenzo[f,h]quinoxaline, dibenzo[f,h]quinoline, and other analogs having two or more nitrogen atoms in the ring system. Other nitrogen analogs of the aforementioned aza derivatives will readily conceive of those skilled in the art, and all such analogs are identified as being included in the terminology used herein.

[0051] In this disclosure, unless otherwise defined, the term "substituted alkyl," "substituted cycloalkyl," "substituted heteroalkyl," "substituted heterocyclic," "substituted aralkyl," "substituted alkoxy," "substituted aryloxy," "substituted alkenyl," "substituted alkynyl," "substituted aryl," "substituted heteroaryl," "substituted alkylsilyl," "substituted arylsilyl," "substituted alkylgermanium," "substituted arylgermanium," "substituted amino," "substituted acyl," "substituted carbonyl," and "substituted carboxylic acid" are used interchangeably. Substituted ester group, substituted sulfinyl group, substituted sulfonyl group, substituted phosphinyl group, refers to any one of the following groups: alkyl, cycloalkyl, heteroalkyl, heterocyclic, aralkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, alkylsilyl, arylsilyl, alkylgermanium, arylgermanium, amino, acyl, carbonyl, carboxylic acid, ester group, sulfinyl, sulfonyl, and phosphinyl. One or more groups can be selected from deuterium, halogen, unsubstituted alkyl groups having 1-20 carbon atoms, and unsubstituted alkyl groups having... Cycloalkyl groups with 3-20 carbon atoms, unsubstituted heteroalkyl groups with 1-20 carbon atoms, unsubstituted heterocyclic groups with 3-20 carbon atoms, unsubstituted aralkyl groups with 7-30 carbon atoms, unsubstituted alkoxy groups with 1-20 carbon atoms, unsubstituted aryloxy groups with 6-30 carbon atoms, unsubstituted alkenyl groups with 2-20 carbon atoms, unsubstituted alkynyl groups with 2-20 carbon atoms, and unsubstituted aryl groups with 6-30 carbon atoms. Unsubstituted heteroaryl groups having 3-30 carbon atoms, unsubstituted alkylsilyl groups having 3-20 carbon atoms, unsubstituted arylsilyl groups having 6-20 carbon atoms, unsubstituted alkylgermanium groups having 3-20 carbon atoms, unsubstituted arylgermanium groups having 6-20 carbon atoms, and unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphine, and combinations thereof having 0-20 carbon atoms.

[0052] It should be understood that when a molecular segment is described as a substituent or otherwise attached to another part, its name may be written according to whether it is a segment (e.g., phenyl, phenylene, naphthyl, dibenzofuranyl) or according to whether it is a whole molecule (e.g., benzene, naphthalene, dibenzofuran). As used herein, these different ways of specifying substituents or attaching segments are considered equivalent.

[0053] In the compounds mentioned in this disclosure, hydrogen atoms can be partially or completely replaced by deuterium. Other atoms such as carbon and nitrogen can also be replaced by their other stable isotopes. Substitution with other stable isotopes in the compounds is likely preferred due to their ability to enhance device efficiency and stability.

[0054] In the compounds mentioned in this disclosure, polysubstituted means including disubstituted, up to the maximum range of available substitutions. When a substituent in a compound mentioned in this disclosure represents polysubstituted (including disubstituted, trisubstituted, tetrasubstituted, etc.), it means that the substituent can be present at multiple available substitution positions on its linkage structure. The substituent present at multiple available substitution positions can be the same structure or different structures.

[0055] In the compounds mentioned in this disclosure, unless explicitly specified, for example, that adjacent substituents can optionally connect to form a ring, adjacent substituents in the compounds cannot connect to form a ring. In the compounds mentioned in this disclosure, the optional connection of adjacent substituents to form a ring includes both cases where adjacent substituents can connect to form a ring and cases where adjacent substituents do not connect to form a ring. When adjacent substituents can optionally connect to form a ring, the formed ring can be a monocyclic or polycyclic ring (including spirocyclic, bridged, fused rings, etc.), as well as an alicyclic, heterocyclic, aromatic, or heteroaromatic ring. In this context, adjacent substituents can refer to substituents bonded to the same atom, substituents bonded to carbon atoms directly bonded to each other, or substituents bonded to carbon atoms further away. Preferably, adjacent substituents refer to substituents bonded to the same carbon atom and substituents bonded to carbon atoms directly bonded to each other.

[0056] The statement that adjacent substituents can optionally connect to form a ring is also intended to be understood as referring to two substituents bonded to the same carbon atom connecting to each other via chemical bonds to form a ring, as exemplified by the following formula:

[0057]

[0058] The statement that adjacent substituents can optionally link to form a ring is also intended to be understood as referring to two substituents bonded to carbon atoms directly bonded to each other forming a ring through chemical bonds, as exemplified by the following formula:

[0059]

[0060] The statement that adjacent substituents can optionally connect to form a ring is also intended to be understood as referring to two substituents bonded to a further distant carbon atom connecting to each other by chemical bonds to form a ring, which can be exemplified by the following formula:

[0061]

[0062] Furthermore, the statement that adjacent substituents can optionally connect to form a ring is also intended to mean that, in the case where one of the two adjacent substituents represents hydrogen, the second substituent bonds to the position where the hydrogen atom is bonded, thereby forming a ring. This is illustrated by the following example:

[0063]

[0064] According to an embodiment of the present invention, a full-color display is disclosed, comprising a plurality of pixel units, wherein each pixel unit comprises at least a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, and each sub-pixel comprises at least one light-emitting layer;

[0065] The first sub-pixel includes at least a first light-emitting layer, and the first light-emitting layer includes at least a first sensitizer and a first light-emitting material;

[0066] The second sub-pixel includes at least a second light-emitting layer, and the second light-emitting layer includes at least a second light-emitting material;

[0067] The third sub-pixel includes at least a third light-emitting layer, and the third light-emitting layer includes at least a third light-emitting material;

[0068] The fourth sub-pixel includes at least a fourth light-emitting layer, and the fourth light-emitting layer includes at least a fourth light-emitting material;

[0069] The maximum emission wavelength of the photoluminescence spectrum of the first luminescent material is 500-700 nm.

[0070] In this paper, the first luminescent material and the second luminescent material can be the same.

[0071] According to one embodiment of the present invention, the first sub-pixel has a density of 1000 cd / m². 2 External quantum efficiency at brightness ≥26%.

[0072] According to one embodiment of the present invention, the first sub-pixel has a density of 1000 cd / m². 2 External quantum efficiency at brightness ≥28%.

[0073] According to one embodiment of the present invention, the first sub-pixel has a density of 1000 cd / m². 2 The full width at half maximum (FWHM) at brightness is ≤35nm.

[0074] According to one embodiment of the present invention, the first sub-pixel has a density of 1000 cd / m². 2 The full width at half maximum (FWHM) at brightness is ≤33nm.

[0075] According to one embodiment of the present invention, the first sub-pixel has a density of 1000 cd / m². 2 The full width at half maximum (FWHM) at brightness is ≤32nm.

[0076] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≤50nm.

[0077] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≤30nm.

[0078] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≤20nm.

[0079] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≤10nm.

[0080] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≤5nm.

[0081] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≥1 nm.

[0082] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≥5 nm.

[0083] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≥10 nm.

[0084] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≥20 nm.

[0085] According to one embodiment of the present invention, in the first luminescent layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first luminescent material is ≥30 nm.

[0086] According to one embodiment of the present invention, the maximum emission wavelength of the photoluminescence spectrum of the second luminescent material is 500-570 nm.

[0087] According to one embodiment of the present invention, the maximum emission wavelength of the photoluminescence spectrum of the second luminescent material is 571-700 nm.

[0088] According to one embodiment of the present invention, the second light-emitting layer further comprises a second sensitizer.

[0089] According to one embodiment of the present invention, the first sensitizer and the second sensitizer are each independently selected from phosphorescent materials or fluorescent materials.

[0090] In this embodiment, the first sensitizer may be the same as or different from the second sensitizer.

[0091] According to one embodiment of the present invention, the first sensitizer and the second sensitizer are each independently selected from phosphorescent materials.

[0092] According to one embodiment of the present invention, the phosphorescent material is a metal complex having M(L) a ) m (L b ) n (L c ) q The general formula;

[0093] M is selected from metals with a relative atomic mass greater than 40;

[0094] ligand L a L b and L c The first ligand, second ligand, and third ligand, respectively, are coordinated with the metal M, and ligand L is... a L b and L c They can be the same or different;

[0095] ligand L a L b and L c They can be selectively linked to form multidentate ligands;

[0096] m is 1, 2, or 3; n is 0, 1, or 2; q is 0, 1, or 2; the sum of m, n, and q equals the oxidation state of metal M; when m is greater than or equal to 2, multiple L a They can be the same or different; when n is 2, the two Ls b They can be the same or different; when q is 2, the two Ls c They can be the same or different;

[0097] The ligand L a It has a structure shown in any one of Equations 2-1 to 2-18:

[0098]

[0099]

[0100] In Equations 2-1 to 2-18, V1 and V2 are selected from C or N each time they appear;

[0101] T1-T 12 Each time it appears, it is selected from CR in the same or different ways. T Or N;

[0102] V and Z are selected from O, S, Se, NR1', CR1'R1', SiR1'R1', GeR1'R1', or combinations thereof, either the same or different each time they appear; when multiple R1's exist simultaneously, the multiple R1's are the same or different.

[0103] X3 to X8 are selected from CR'2 or N, either identically or differently each time they appear;

[0104] Each occurrence of Y'1 to Y'4, whether identical or different, is selected from CR'1 or N;

[0105] R'1, R'2, R1' and R TEach time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms;

[0106] Adjacent substituents R'1, R'2, R1' and R T They can be arbitrarily connected to form a ring.

[0107] In this paper, "adjacent substituents R'1, R'2, R1' and R..." T "Optionally connected to form a ring" is intended to indicate adjacent substituent groups, for example, between two substituents R'1, between two substituents R'2, between two substituents R1', and between two substituents R'1'. T Between these substituents, any one or more of these substituent groups can connect to form a ring. Obviously, these substituents can also not connect to form a ring.

[0108] According to one embodiment of the present invention, the metal complex has a structure represented by any one of the formulas Ma-1 to Ma-9 and Mb-1 to Mb-5:

[0109]

[0110]

[0111] Among them, ring A 1’ Ring A2, Ring A 22 Each time ring A3 appears, it is selected from aromatic rings having 6-30 ring atoms, heteroaromatic rings having 5-30 ring atoms, or combinations thereof, either identically or differently.

[0112] Ring A 21Selected from heteroaromatic rings with 5 ring atoms;

[0113] E1 to E4, Y2, Y3, Y5 to Y 10 Each occurrence is either identical or different and is selected from C or N;

[0114] Y1'-Y4' are selected from CR each time they appear, either identically or differently. y1’ Or N;

[0115] When X3-X8 appear, select CR' either the same or different each time. 21 CR' 22 Or N; and at least one of X3-X8 is selected from CR' 21 The R' 21 Selected from cyano or fluorine;

[0116] G1 is selected from O or S each time it appears, either the same or different.

[0117] T1-T 12 Each time it appears, it is selected from CR in the same or different ways. T Or N;

[0118] V and Z are each independently selected from O, S, or Se;

[0119] Y1, Y4, Y 11 Each occurrence is selected from CR”', N, NR”', O or S, either identically or differently;

[0120] Each time m appears, it is selected from 0, 1, 2, or 3, either the same or different.

[0121] R a’ R b’ R1, R2, R3, and R4 appearing in the same or different ways each time indicate monosubstitution, polysubstitution, or no substitution;

[0122] R a’ R b’ R a R b R c R y1’ R1, R2, R3, R4, R' 22 ,R”',R TEach time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms;

[0123] Adjacent substituent R a’ R b’ R y1’ R T R1, R2, R3, and R4 can be optionally connected to form a loop.

[0124] In this paper, "adjacent substituent R" a’ R b’ R y1’ R T "R1, R2, R3, and R4 can optionally be connected to form a ring" is intended to indicate adjacent substituent groups, for example, two substituents R a’ Between the two substituents R b’ Between the two substituents R y1’ Between the two substituents R T Between two substituents R1, between two substituents R2, between two substituents R3, between two substituents R4, any one or more of these substituent groups can connect to form a ring. Obviously, these substituents can also not connect to form a ring.

[0125] According to one embodiment of the present invention, the metal complex has a structure represented by formula Mb-2-1 or formula Mb-2-2:

[0126]

[0127] Among them, in formulas Mb-2-1 and Mb-2-2,

[0128] V is selected from O or S each time it appears, either the same or different;

[0129] T1-T3, T5, T7-T 10 Each time it appears, it is selected from CR in the same or different ways. T Or N;

[0130] R t R T R i2 Each time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms;

[0131] Adjacent substituent R T They can be arbitrarily connected to form a ring.

[0132] In this paper, adjacent substituents R T They can be optionally linked to form a ring, intended to represent adjacent substituent groups, for example, two substituents R T It is obvious that these substituents may not be connected to each other to form a ring.

[0133] According to one embodiment of the present invention, R t and R i2Each time it appears, it is selected from the group consisting of the same or different groups: deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 ring atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted groups having Alkynyl groups with 2-20 carbon atoms, substituted or unsubstituted aryl groups with 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups with 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups with 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups with 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups with 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups with 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof with 0-20 carbon atoms;

[0134] According to one embodiment of the present invention, R t and R i2 Each time it appears, it is selected from the group consisting of the following, either identically or differently: substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 cyclic carbon atoms, and combinations thereof.

[0135] According to one embodiment of the present invention, the metal complex is selected from the group consisting of compounds M-a1 to M-a92, compounds Ma-93 to Ma-121, compounds M-b1 to M-b62, and compounds RD-1 to RD-93.

[0136]

[0137]

[0138]

[0139]

[0140]

[0141]

[0142]

[0143]

[0144]

[0145] According to one embodiment of the present invention, the first luminescent material and the second luminescent material are each independently selected from structures having any one of the structures represented by formulas 5-1-1 to 5-1-3:

[0146]

[0147] In Formulas 5-1-1 to 5-1-3, ring A, ring B, ring C, ring D and ring E are each independently selected from five-membered unsaturated carbon rings, aromatic rings having 6 to 30 carbon atoms, heteroaromatic rings having 3 to 30 carbon atoms, or combinations thereof;

[0148] E1 through E4 are each independently selected from single bonds, BR z CR z R z SiR z R z GeR z R z NR z PR z P = O(R) z ), O, S, S=O, Se or Se=O; when multiple R exist simultaneously z At that time, multiple R z Same or different;

[0149] R a1 R b1 R c1 R d1 R e1 Each occurrence, whether identical or different, indicates monosubstitution, polysubstitution, or no substitution;

[0150] R a1 R b1 R c1 R d1 R e1 R zEach occurrence is selected from the group consisting of, either identically or differently, of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and so on. The following are substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium alkyl groups having 6-20 carbon atoms, substituted or unsubstituted amino groups having 0-20 carbon atoms, BR'R', acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphin, and combinations thereof.

[0151] R', each time appearing, is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 ring atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, and substituted or unsubstituted aralkyl groups having 6-30 carbon atoms. Oxygen groups, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6-20 carbon atoms, substituted or unsubstituted amino groups having 0-20 carbon atoms, BR 1 'R 1 Acyl, carbonyl, carboxylic acid, ester, cyano, isocyanate, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphine, and combinations thereof;

[0152] Adjacent substituent R a1 R b1 R c1 R d1 R e1 R z 、R'、R1 They can be arbitrarily connected to form a ring.

[0153] In this paper, adjacent substituents R a1 R b1 R c1 R d1 R e1 R z 、R'、R 1 'Can be optionally linked to form a ring, intended to represent adjacent substituent groups, for example, two substituents R a1 Between the two substituents R b1 Between the two substituents R c1 Between the two substituents R d1 Between the two substituents R e1 Between the two substituents R z Between, between the two substituents R', between the two substituents R 1 Between ', substituent R a1 and R b1 Between, substituent R a1 and R c1 Between, substituent R c1 and R d1 It is obvious that these substituents may not be connected to each other to form a ring.

[0154] According to one embodiment of the present invention, the first luminescent material and the second luminescent material are each independently selected from the group consisting of compounds BD-1 to BD-217 and BD2-1 to BD2-25.

[0155]

[0156]

[0157]

[0158]

[0159]

[0160]

[0161]

[0162]

[0163]

[0164]

[0165]

[0166]

[0167]

[0168]

[0169] In the above structure, tBu represents tert-butyl.

[0170] According to one embodiment of the present invention, the hydrogen in compounds BD-1 to BD-215, and BD2-1 to BD2-25 can be partially or completely replaced by deuterium.

[0171] According to one embodiment of the present invention, the third sub-pixel is at 1000 cd / m 2 External quantum efficiency at brightness ≥25%.

[0172] According to one embodiment of the present invention, the third sub-pixel is at 1000 cd / m 2 External quantum efficiency at brightness ≥26%.

[0173] According to one embodiment of the present invention, the third sub-pixel is at 1000 cd / m 2 External quantum efficiency at brightness ≥27%.

[0174] According to one embodiment of the present invention, the third sub-pixel is at 1000 cd / m 2 The full width at half maximum (FWHM) at brightness is ≤35nm.

[0175] According to one embodiment of the present invention, the third sub-pixel is at 1000 cd / m 2 The full width at half maximum (FWHM) at brightness is ≤32nm.

[0176] According to one embodiment of the present invention, the third sub-pixel is at 1000 cd / m 2 The full width at half maximum (FWHM) at brightness is ≤31nm.

[0177] According to one embodiment of the present invention, the maximum emission wavelength of the photoluminescence spectrum of the first luminescent material is 500-570 nm, the maximum emission wavelength of the photoluminescence spectrum of the second luminescent material is 500-570 nm, the maximum emission wavelength of the photoluminescence spectrum of the third luminescent material is 450-465 nm, and the maximum emission wavelength of the photoluminescence spectrum of the fourth luminescent material is 571-700 nm.

[0178] According to one embodiment of the present invention, the maximum emission wavelength of the photoluminescence spectrum of the first luminescent material is 500-570 nm, the maximum emission wavelength of the photoluminescence spectrum of the second luminescent material is 571-700 nm, the maximum emission wavelength of the photoluminescence spectrum of the third luminescent material is 450-465 nm, and the maximum emission wavelength of the photoluminescence spectrum of the fourth luminescent material is 466-499 nm.

[0179] According to one embodiment of the present invention, the maximum emission wavelength of the photoluminescence spectrum of the third luminescent material is 450-499 nm.

[0180] According to one embodiment of the present invention, the third light-emitting layer further comprises a third sensitizer.

[0181] According to one embodiment of the present invention, the maximum emission wavelength of the photoluminescence spectrum of the fourth luminescent material is 466-499 nm.

[0182] According to one embodiment of the present invention, the fourth light-emitting layer further comprises a fourth sensitizer.

[0183] According to one embodiment of the present invention, the third luminescent material and the fourth luminescent material are each independently selected from phosphorescent materials or fluorescent materials.

[0184] In this embodiment, the third luminescent material and the fourth luminescent material may be the same or different.

[0185] According to one embodiment of the present invention, the third sensitizer and the fourth sensitizer are each independently selected from phosphorescent materials or fluorescent materials.

[0186] In this embodiment, the third sensitizer and the fourth sensitizer may be the same or different.

[0187] According to one embodiment of the present invention, the third or fourth luminescent material is a metal complex, the metal complex having M(L) a ) m (L b ) n (L c ) q The general formula;

[0188] M is selected from metals with a relative atomic mass greater than 40;

[0189] ligand L a L b and L c The first ligand, second ligand, and third ligand, respectively, are coordinated with the metal M, and ligand L is... a L b and L cThey can be the same or different;

[0190] ligand L a L b and L c They can be selectively linked to form multidentate ligands;

[0191] m is 1, 2, or 3; n is 0, 1, or 2; q is 0, 1, or 2; the sum of m, n, and q equals the oxidation state of metal M; when m is greater than or equal to 2, multiple L a They can be the same or different; when n is 2, the two Ls b They can be the same or different; when q is 2, the two Ls c They can be the same or different;

[0192] The ligand L a It has the structure shown in Equation A:

[0193]

[0194] U1-U 10 Each time it appears, it is selected from CR in the same or different ways. n Or N;

[0195] R n Each time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms;

[0196] Where in equation A Indicates with L b The location of the connection;

[0197] Adjacent substituent R nThey can be arbitrarily connected to form a ring.

[0198] In this paper, adjacent substituents R n They can be optionally linked to form a ring, intended to represent adjacent substituent groups, for example, two substituents R n It is obvious that these substituents may not be connected to each other to form a ring.

[0199] According to one embodiment of the present invention, the metal complex has a structure represented by any one of Formulas 3-1 to 3-18:

[0200]

[0201] U1-U 20 Each time it appears, it is selected from CR in the same or different ways. n Or N;

[0202] R, each time appearing, is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms;

[0203] Adjacent substituents R can optionally connect to form a ring.

[0204] In this document, adjacent substituents R can optionally connect to form a ring, which is intended to represent adjacent groups of substituents, for example, between two substituents R. Obviously, these substituents may also not connect to form a ring.

[0205] According to an embodiment of the present invention, the metal complex has Pt(L) a (L) bThe structure is represented by ) where L a and L b These are the first and second ligands that coordinate with metallic Pt, respectively, and the L a Choose freely L a 1-1 to L a 1-8 and L a 2-1 to L a Groups consisting of 2-23:

[0206]

[0207]

[0208]

[0209] The L a 1-1 to L a 1-8 and L a 2-1 to L a In the structure 2-23 Indicates with L b The location of the connection, the L b Choose freely L b 1-1 to L b 1-25 and L b 2-1 to L b Groups consisting of 2-6:

[0210]

[0211]

[0212]

[0213] The L b 1-1 to L b 1-25 and L b 2-1 to L b In the structure 2-6, "#" indicates a relationship with L. a The location of the connection;

[0214] According to one embodiment of the present invention, the metal complex is selected from the group consisting of Pt1 to Pt111, wherein Pt1 to Pt111 has Pt(L) a (L) b The structure represented by ) and the L a and the L b These correspond to the structures shown in the table below:

[0215]

[0216]

[0217] According to one embodiment of the present invention, the third or fourth luminescent material is a fluorescent material, the fluorescent material having a structure represented by any one of Formulas 5-1-1 to 5-1-2:

[0218]

[0219] In Formulas 5-1-1 to 5-1-2, rings A, B, C, D and E are each independently selected from five-membered unsaturated carbon rings, aromatic rings having 6-30 carbon atoms, heteroaromatic rings having 3-30 carbon atoms, or combinations thereof.

[0220] E1 and E2 are each independently selected from single bonds, BR z CR z R z SiR z R z GeR z R z NR z PR z P = O(R) z ), O, S, S=O, Se or Se=O; when multiple R exist simultaneously z At that time, multiple R z Same or different;

[0221] R a1 R b1 R c1 R d1 R e1 Each occurrence, whether identical or different, indicates monosubstitution, polysubstitution, or no substitution;

[0222] R a1 R b1 R c1 R d1 R e1 R zEach occurrence is selected from the group consisting of, either identically or differently, of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and so on. The following are substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium alkyl groups having 6-20 carbon atoms, substituted or unsubstituted amino groups having 0-20 carbon atoms, BR'R', acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphin, and combinations thereof.

[0223] R', each time appearing, is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 ring atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, and substituted or unsubstituted aralkyl groups having 6-30 carbon atoms. Oxygen groups, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6-20 carbon atoms, substituted or unsubstituted amino groups having 0-20 carbon atoms, BR 1 'R 1 Acyl, carbonyl, carboxylic acid, ester, cyano, isocyanate, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphine, and combinations thereof;

[0224] Adjacent substituent R a1 R b1 R c1 R d1 R e1 R z 、R'、R1 They can be arbitrarily connected to form a ring.

[0225] According to one embodiment of the present invention, the fluorescent material is selected from the group consisting of compounds BD1-1 to BD1-47:

[0226]

[0227]

[0228]

[0229] According to one embodiment of the present invention, the hydrogen in compounds BD1-1 to BD1-47 is partially or completely replaced by deuterium.

[0230] According to one embodiment of the present invention, the first sensitizer, the second sensitizer, the third sensitizer, and the fourth sensitizer are each independently selected from TADF materials.

[0231] According to one embodiment of the present invention, the TADF material has a structure represented by Formula 4:

[0232]

[0233] In Formula 4, each time ring E' appears, it is selected from five-membered unsaturated carbon rings, aromatic rings with 6-60 carbon atoms, heteroaromatic rings with 3-60 carbon atoms, or combinations thereof;

[0234] The substituent Do is a group having at least one electron-donating group;

[0235] The substituent Ac is a group having at least one electron-withdrawing group;

[0236] The substituent Do is selected, in the same or different manner, from the group consisting of: substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted amino groups having 0-36 carbon atoms, and combinations thereof.

[0237] The substituent Ac, each time appearing, is selected from the group consisting of: halogen, nitroso, nitro, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, SCN, OCN, SF5, borane, sulfinyl, sulfonyl, phosphoxy, azirrocycloyl, and any of the following groups substituted by one or more of halogen, nitroso, nitro, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, SCN, OCN, SF5, borane, sulfinyl, sulfonyl, phosphoxy, azirrocycloyl, having 1-2 Alkyl groups with 0 carbon atoms, cycloalkyl groups with 3-20 cyclic carbon atoms, heteroalkyl groups with 1-20 carbon atoms, aralkyl groups with 7-30 carbon atoms, alkoxy groups with 1-20 carbon atoms, aroxy groups with 6-30 carbon atoms, alkenyl groups with 2-20 carbon atoms, alkynyl groups with 2-20 carbon atoms, aryl groups with 6-30 carbon atoms, heteroaryl groups with 3-30 carbon atoms, alksilyl groups with 3-20 carbon atoms, arylsilyl groups with 6-20 carbon atoms, and combinations thereof;

[0238] nd and na are each independently selected from integers from 1 to 10.

[0239] According to one embodiment of the present invention, the first light-emitting layer, the second light-emitting layer, the third light-emitting layer and the fourth light-emitting layer further comprise a first host material.

[0240] According to one embodiment of the present invention, the first light-emitting layer, the second light-emitting layer, the third light-emitting layer and the fourth light-emitting layer further comprise a first host material and a second host material.

[0241] According to one embodiment of the present invention, the first body material has a structure represented by any one of Formulas 5 to 7 and Formula Y:

[0242]

[0243] In Equation 5, Z1 to Z3 are selected from CR4 or N each time they appear, and at least one of Z1 to Z3 is N;

[0244] Each time L appears, it is selected from the following groups, either the same or different: single bond, substituted or unsubstituted aryl group with 6-30 carbon atoms, substituted or unsubstituted heteroaryl group with 3-30 carbon atoms, and combinations thereof.

[0245] In Equations 6 and 7, Z4 is selected from CR4 or N each time it appears, and at least one Z4 is N;

[0246] Z is selected from O, S, or Se each time it appears, either identically or differently.

[0247] R1-R4, each time appearing, are selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted... Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms;

[0248] Adjacent substituents R4 can optionally connect to form a ring;

[0249] In formula Y, H1-H6 are selected from C and CR each time they appear, either identically or differently. h Or N, and at least two of H1-H6 are N, at least one of H1-H6 is C, and connected to equation A;

[0250]

[0251] in,

[0252] Q can be selected from O, S, Se, N, NR, whether it appears the same or different each time. Q CR Q R Q SiR Q R Q GeR Q R Q and R Q C = CR Q A group consisting of two R groups; when two R groups exist simultaneously Q At that time, two R Q They can be the same or different;

[0253] p is 0 or 1; r is 0 or 1;

[0254] When Q is selected from N, p is 0 and r is 1;

[0255] When Q is selected from O, S, Se, NR Q CR Q R Q SiR Q R Q GeR Q R Q and R Q C = CR Q When forming a group, p is 1 and r is 0;

[0256] L Q When appearing again, the same or different from single bonds, substituted or unsubstituted alkylene groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkylene groups having 3-20 carbon atoms, substituted or unsubstituted arylene groups having 6-20 carbon atoms, substituted or unsubstituted heteroarylene groups having 3-20 carbon atoms, or combinations thereof.

[0257] Q1-Q8 are selected from C and CR each time they appear, either identically or differently. q” Or N;

[0258] R h R Q and R q” Each time it appears, it is selected from the group consisting of, either identically or differently, hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having... Alkynyl groups with 2-20 carbon atoms, substituted or unsubstituted aryl groups with 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups with 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups with 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups with 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups with 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups with 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof with 0-20 carbon atoms;

[0259] "*" represents the position where equation A and equation Y are connected;

[0260] Adjacent substituent R h R Q R q” They can be arbitrarily connected to form a ring.

[0261] In this paper, "adjacent substituent R" h R Q R q” "Can be optionally linked to form a ring" is intended to indicate that adjacent substituent groups therein, for example, two substituents R h Between the two substituents R Q Between the two substituents R q” Between these substituents, any one or more of these substituent groups can connect to form a ring. Obviously, these substituents can also not connect to form a ring.

[0262] According to one embodiment of the present invention, the first host material is selected from the group consisting of compounds N-1-1 to N-1-60, compounds N-2-1 to N-2-35, compounds N-3-1 to N-3-9, compounds N-4-1 to N-4-34, compounds H-1 to H-109, and compounds NH-1 to NH-251.

[0263]

[0264]

[0265]

[0266]

[0267]

[0268]

[0269]

[0270]

[0271]

[0272]

[0273]

[0274]

[0275]

[0276]

[0277]

[0278]

[0279]

[0280]

[0281]

[0282]

[0283]

[0284]

[0285]

[0286]

[0287]

[0288]

[0289]

[0290]

[0291] According to one embodiment of the present invention, the second body material has a structure represented by formula 8, formula 9 or formula 11:

[0292]

[0293] L 11 Selected from single bonds, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, or combinations thereof;

[0294] Ar 11 Selected from substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted amino groups having 0-30 carbon atoms, or combinations thereof;

[0295] G' is selected from C(R) each time it appears, either identically or differently. g ')2、NR g ', O or S;

[0296] V0 is selected from C or CR each time it appears, either identically or differently. 12 Or N;

[0297] R6, when appearing in the same or different instances, indicates monosubstitution, polysubstitution, or no substitution.

[0298] R6, R 12 R g Each time it appears, it is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 ring atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted groups having 2-20 carbon atoms. Alkenyl, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms;

[0299] Adjacent substituents R6, R 12 They can be arbitrarily connected to form a ring.

[0300] In this paper, "adjacent substituents R6, R 12 "Optionally connected to form a ring" is intended to indicate that adjacent substituent groups are, for example, between two substituents R6, and between two substituents R 12 Between these substituents, any one or more of these substituent groups can connect to form a ring. Obviously, these substituents can also not connect to form a ring.

[0301] According to one embodiment of the present invention, the second host compound is selected from the group consisting of compounds P-1 to P-66 and compounds PH-1 to PH-240.

[0302]

[0303]

[0304]

[0305]

[0306]

[0307]

[0308]

[0309]

[0310]

[0311]

[0312]

[0313]

[0314]

[0315]

[0316]

[0317]

[0318]

[0319]

[0320]

[0321] According to one embodiment of the present invention, the hydrogen in the structures of compounds P-1 to P-66, and compounds PH-1 to PH-240 can be partially or completely replaced by deuterium.

[0322] Combination with other materials

[0323] The materials described in this invention for specific layers in organic light-emitting devices can be used in combination with a variety of other materials present in the device. These combinations of materials are described in detail in paragraphs 0132-0161 of U.S. Patent Application US2016 / 0359122A1, the entire contents of which are incorporated herein by reference. The materials described or mentioned herein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can readily consult the literature to identify other materials that can be used in combination.

[0324] Materials described herein for use in specific layers of organic light-emitting devices can be used in combination with a variety of other materials present in said devices. For example, the compounds disclosed herein can be used in combination with a variety of light-emitting dopants, substrates, transport layers, blocking layers, implantation layers, electrodes, and other possible layers. These combinations of materials are described in detail in paragraphs 0080-0101 of U.S. Patent Application US2015 / 0349273A1, the entire contents of which are incorporated herein by reference. The materials described or mentioned herein are non-limiting examples of materials that can be used in combination with the compounds disclosed herein, and those skilled in the art can readily consult the literature to identify other materials that can be used in combination.

[0325] In the examples of material synthesis, unless otherwise stated, all reactions were carried out under nitrogen protection. All reaction solvents were anhydrous and used as is from commercial sources. The synthesized products were structurally confirmed and characterized using one or more instruments conventional in the art (including but not limited to Bruker's nuclear magnetic resonance spectrometer, Shimadzu's liquid chromatograph, liquid chromatography-mass spectrometry, gas chromatography-mass spectrometry, differential scanning calorimeter, Shanghai Lingguang Technology's fluorescence spectrophotometer, Wuhan Kesite's electrochemical workstation, Anhui Beiyike's sublimation apparatus, etc.) in methods well known to those skilled in the art. In the examples of devices, the characteristics of the devices were also tested using conventional equipment in the art (including but not limited to evaporation machines manufactured by Angstrom Engineering, optical testing systems and lifetime testing systems manufactured by Suzhou Fushida, ellipsometers manufactured by Beijing Liangtuo, etc.) in methods well known to those skilled in the art. Since those skilled in the art are familiar with the use of the above-mentioned equipment, testing methods, and other related content, and can obtain the inherent data of the samples definitively and unaffected, the above-mentioned related content will not be elaborated further in this patent.

[0326] As described in this article, the refractive index testing method for each organic layer of the organic electroluminescent device is as follows: a 30nm thick material is deposited on a silicon wafer using an Angstrom Engineering evaporation machine, and the refractive index curves with wavelengths ranging from 400nm to 800nm ​​are obtained using an ESNano ellipsometer from Beijing Liangtuo Technology Co., Ltd. Furthermore, the refractive index parameters for the glass, cathode layer material, anode materials Ag and ITO, and EIL material Yb are all derived from the refractive index library included in the SETFOS optical simulation software. Details are shown in Table 1.

[0327]

[0328] As used herein, the term "single-layer device" refers to a device with one and only one emitting layer between a pair of anodes and cathodes, along with associated hole transport, electron transport, etc. As described herein, the method for testing the electroluminescence spectrum (EL spectrum) of the emitting layer is as follows: a single-layer device is fabricated in an Angstrom Engineering evaporation machine, and its electroluminescence spectrum is tested using an optical testing system manufactured by Suzhou Fosstar Co., Ltd., with a wavelength range of 400-750 nm. Through the fabrication and testing of the single-layer device, the emitting layer EL spectrum can be obtained for optical simulation.

[0329] The fabrication method of organic electroluminescent devices is not limited. The fabrication method of the following monolayer device is merely an example and should not be construed as limiting. Those skilled in the art can reasonably improve the fabrication method of the following monolayer device based on existing technology. For example, the proportions of various materials in the luminescent layer are not particularly limited. Those skilled in the art can reasonably select them within a certain range based on existing technology. For instance, based on the total weight of the luminescent layer materials, the main compound can account for 80%-99%, and the luminescent material can account for 1%-20%; or the main compound can account for 90%-99%, and the luminescent material can account for 1%-10%; or the main compound can account for 95%-99%, and the luminescent material can account for 1%-5%. Furthermore, the main compound can contain one or two materials, wherein the ratio of the two main compounds to the main compound can be 100:0 to 1:99; or, the ratio can be 80:20 to 20:80; or, the ratio can be 60:40 to 40:60. In single-layer devices, the characteristics of the device are also tested using conventional equipment in the art (including but not limited to evaporation machines manufactured by Angstrom Engineering, optical testing systems and lifetime testing systems manufactured by Suzhou Fushida, ellipsometers manufactured by Beijing Liangtuo, etc.) and methods well known to those skilled in the art. Since those skilled in the art are familiar with the use of the above-mentioned equipment, testing methods, and other related content, and can obtain the inherent data of the sample reliably and unaffected, the above-mentioned related content will not be elaborated further in this invention.

[0330] As used herein, the term "simulation" refers to optical simulation software that uses only the refractive index curves and thicknesses of each layer of material, excluding electrical simulations, etc.; the simulation software used in this invention is Setfos 5.0 semiconductor thin film optical simulation software developed by FLUXIM.

[0331] Single-layer device D-1: First, a 0.7mm thick glass substrate is used, on which a pre-patterned ITO is formed. As the anode. The substrate is then dried in a glove box to remove moisture and placed on a support before being transferred to the vacuum chamber. The organic layer specified below is applied at a vacuum degree of approximately 10.-6 In the case of Torr, The rate was achieved by sequentially depositing compounds HT-G and HI on the anode using vacuum thermal evaporation: first, compounds HT-G and HI were simultaneously deposited as hole injection layers (HIL, 97:3). The vapor-deposited compound HT-G is used as a hole transport layer (HTL). Next, compound PH-1 is vapor-deposited as an electron blocking layer (EBL). The compound PH-51, compound NH-136, and compound Ma-121 are simultaneously deposited on it as the luminescent layer (EML, 55.6:38.4:6). Next, compound N-4-1 is vapor-deposited as a hole-blocking layer (HBL). Then, compounds ET and Liq were simultaneously deposited as an electron transport layer (ETL, 40:60). Finally, vapor deposition. A thick layer of Liq is used as the electron injection layer (EIL), and finally, metallic aluminum is evaporated as the cathode. The device is then transferred back to the glove box and sealed with a glass cover to complete the device.

[0332] Single-layer device D-2: The preparation method of single-layer device D-2 is the same as that of single-layer device D-1, the only difference being that the light-emitting layer (EML) is formed by co-evaporation of compounds PH-51, NH-136, Ma-121, and BD-216 (weight ratio 55.9:37.3:6:0.8). ).

[0333] Single-layer device D-3:

[0334] The fabrication method of monolayer device D-3 is the same as that of device D-1, the difference being that the thickness of the hole transport layer in monolayer device D-1 is reduced from... Adjusted to The electron blocking layer (EBL) was formed by replacing compound PH-1 with compound EB-R. A light-emitting layer (EML, weight ratio 29:69:2) was formed by vapor deposition using compounds PH-225, NH-230, and RD-80. ).

[0335] Single-layer device D-4: The preparation method of single-layer device D-4 is the same as that of single-layer device D-3, the only difference being that the light-emitting layer (EML) is formed by vapor deposition using compounds PH-225, NH-230, RD-80, and BD-217, with a weight ratio of 29.3:68.4:2:0.3. ).

[0336] Monolayer device D-5: The fabrication method of monolayer device D-5 is the same as that of monolayer device D-1, the difference being that the compound HT-G in device D-1 is replaced with HT-B, and the thickness is adjusted to... Compound EB-R was used to replace compound PH-1 to form an electron blocking layer, and compound P-21 (EBL) was used. An luminescent layer (EML) was formed by vapor deposition using compounds P-25, N-3-2, and Pt27, with a weight ratio of 52:35:12:1. Compound N-4-1 was replaced with compound N-3-2.

[0337] Single-layer device D-6: The preparation method of single-layer device D-6 is the same as that of single-layer device D-5, the only difference being that the light-emitting layer (EML) is formed by vapor deposition using compounds P-25, N-3-2, Pt27, and BD1-6, with a weight ratio of 52:35:12:1, at 350 nm. ).

[0338] Single-layer device D-7: The preparation method of single-layer device D-7 is the same as that of single-layer device D-5, the only difference being that the light-emitting layer (EML) is formed by vapor deposition using compounds P-25, N-3-2, and Pt97, with a weight ratio of 52.8:35.2:12. ).

[0339] Single-layer device D-8:

[0340] The fabrication method of the monolayer device D-8 is the same as that of the monolayer device D-5, the only difference being that the light-emitting layer (EML) is formed by vapor deposition using compounds P-25, N-3-2, Pt97, and BD1-24, in a weight ratio of 52:35:12:1. ).

[0341] The partial device structure and thickness of the single-layer device, as well as the maximum emission wavelength λmax and full width at half maximum (FWHM) of the obtained EL spectrum, are shown in Table 2 below. The layers used are made of multiple materials, obtained by doping different compounds in their stated weight ratios. The maximum emission wavelength λmax and FWHM of the EL spectrum were obtained at a current density of 10 mA / cm². 2 The following measurements were taken.

[0342] Table 2. Partial device structure and spectral data of single-layer devices.

[0343]

[0344]

[0345] The structure of the material used in the device is shown below:

[0346]

[0347]

[0348] Using the above single-layer device, we can obtain the electroluminescence spectrum, i.e., EL spectrum, of different light-emitting layers. Specific data are shown in Table 2.

[0349] As described herein, the term "simulation" refers only to simulations performed using optical simulation software, focusing on the refractive index and thickness of each material layer and the EL spectrum corresponding to the emitting layer, excluding electrical simulations, etc. The optical simulation software used in this invention is SETFOS 5.1.1 semiconductor thin film optical simulation software developed by Fluxim AG.

[0350] Regarding the specific experiments, this paper uses data from simulation experiments.

[0351] Analog device G1:

[0352] First, in the device structure, the refractive index and thickness of each layer material and the EL spectrum of each light-emitting layer are substituted in a manner known to those skilled in the art. Simultaneously, by adjusting the thicknesses of different light-emitting layers and HTL layers, the color points of the simulated device are made to be substantially similar. Specifically: for 0.7mm glass, such as... Figure 3 China 201, followed by ITO, such as Figure 3 210, Ag, such as Figure 3 in 211, and ITO, such as Figure 3 212 in the middle, including such as Figure 3 Electrodes 210, 211, and 212 together serve as the first electrode, which is the anode; followed by... HIL-G, such as Figure 3 220; followed by HT-G, such as Figure 3 230; followed by PH-1, such as Figure 3 240; followed by Green EML with a photoluminescence spectrum wavelength range of 500-570 nm, such as Figure 3 The value of 250 was used, and the EL spectrum obtained by substituting it into the EML of the monolayer device D-1 was then used; subsequently... N-4-1, such as Figure 3 260 in the middle, followed by ETL, such as Figure 3 270, followed by Yb, such as Figure 3280, followed by Mg / Ag, such as Figure 3 290 in China, including... Figure 3 290 is the second electrode, which is the cathode, followed by... CPL, such as Figure 3 The middle 291, and finally the 0.7mm glass, such as Figure 3 202.

[0353] Analog device G2:

[0354] The simulation method and structure are the same as those of the analog device G1. The difference is that the EML of the analog device G1 is replaced with the EL spectrum of the photoluminescence spectrum with a wavelength range of 500-570nm obtained by substituting it into the single-layer device D-2.

[0355] Analog device R1:

[0356] The simulation method and structure are the same as those of the analog device G1, the difference being that... Replace HT-G with The HT-R will Replace PH-1 with In the EB-R, replace the EML of analog device G1 with N-4-26:RD-80(98:2, The resulting photoluminescence spectrum has a wavelength range of 571-700 nm.

[0357] Analog device R2:

[0358] The simulation method and structure are the same as those of analog device R1, except that the EML of analog device R1 is replaced with N-4-26:RD-80:BD-217(97.7:2:0.3). The obtained photoluminescence spectrum has a wavelength range of 571-700 nm.

[0359] Analog device B1:

[0360] The simulation method and structure are the same as those of the analog device G1, the difference being that... Replace HT-G with HT-B will Replace PH-1 with The P-21 will N-4-1 replaced with N-3-2, will ETL thickness adjusted to Replace the EML of analog device G1 with the EML of single-layer device D-5, and adjust the thickness of the EML to... The resulting photoluminescence spectrum has a wavelength range of 450-465 nm.

[0361] Analog device B2:

[0362] Similar to the simulation method and structure of analog device B1, the EML of analog device B1 is replaced with the EL spectrum of photoluminescence wavelength in the range of 466-499nm obtained by substituting the EML of single-layer device D-6.

[0363] Analog device B3:

[0364] Similar to the simulation method and structure of analog device B1, the EML of analog device B1 is replaced with the EL spectrum of photoluminescence wavelength in the range of 466-499nm obtained by substituting the EML of single-layer device D-7.

[0365] Analog device B4:

[0366] Similar to the simulation method and structure of analog device B1, the EML of analog device B1 is replaced with the EL spectrum of photoluminescence wavelength in the range of 466-499nm obtained by substituting the EML of single-layer device D-8.

[0367] The device structures of Examples 1-4 and Comparative Example 1 are shown in Table 3 below.

[0368] Table 3 shows the structures of Examples 1-4 and Comparative Example 1.

[0369]

[0370] "×" indicates that the structure is not used in the analog device; "√" indicates that the structure is used in the analog device.

[0371] Tables 4 and 5 summarize the color coordinates (CIEx, CIEy), current efficiency (CE), and blue index (BI) values ​​of analog devices G1, G2, R1, R2, B1, B2, B3, and B4. Among them, BI (=CE / CIEy) is the core evaluation index for measuring the balance between luminous efficiency and color purity of blue light materials.

[0372] Table 4. Performance of some analog devices G1, G2, R1, R2, B1, B2, B3, and B4

[0373] serial number CIEx CIEy CE(cd / A) Analog device G1 0.196 0.762 203 Analog device G2 0.256 0.726 267 Analog device R1 0.630 0.369 122.5 Analog device R2 0.621 0.378 141.3

[0374] Table 5. Performance of some analog devices B1, B2, B3, and B4

[0375]

[0376]

[0377] Discussion: Based on the simulation data in Tables 4 and 5, and combined with the device configuration in Table 3, compared to Comparative Example 1, in Example 1, only the simulation device G2 used a sensitizer with at least one sub-pixel having a maximum emission wavelength greater than 500nm, as defined in this invention. The CIEy value is closer to the strict NTSC color gamut standard, resulting in richer color display. The CE value is significantly improved by 32%, a substantial increase that allows for better color display at specific brightness levels (e.g., 1000 cd / m²). 2 The current and voltage will decrease, thereby reducing the power consumption of the sub-pixel, which in turn reduces the power consumption of the entire pixel. In this way, not only are the photoelectric characteristics of the G2 sub-pixel itself directly optimized, but also the performance of the entire pixel unit is boosted through the synergistic effect between sub-pixels.

[0378] Compared to Comparative Example 1, in Example 2, both analog devices G2 and R2 incorporate at least one sub-pixel of the present invention as a sensitizer with a maximum emission wavelength greater than 500 nm. This configuration not only improves the performance of the green sub-pixel but also increases the CE value of the red sub-pixel by 15.3%, even though the color coordinates of the red sub-pixel are close to those of Comparative Example 1. Undoubtedly, at a specific brightness level (e.g., 1000 cd / m²), [the performance improvement is achieved]. 2 As a result, the current and voltage will decrease further, thereby reducing the power consumption of more sub-pixels, and thus reducing the power consumption of the entire pixel. It can be seen that the performance of both red and green sub-pixels has been significantly improved, and the overall performance of the entire pixel unit has been significantly improved.

[0379] Compared to Comparative Example 1, in Example 3, the sensitized device sub-pixels defined in this invention are further configured in analog devices G2, R2, and deep blue analog device B2. In addition to possessing the dual advantages of Example 2, this solution significantly improves the BI value by 40% while maintaining the same CIEx value as Comparative Example 1. This not only results in a wider color gamut and richer colors, but also further enhances the power consumption reduction effect, achieving a continuous improvement.

[0380] Compared to Comparative Example 1, Example 4 employs the sensitized device sub-pixels defined in this invention in all analog devices G2, R2, Deep Blue B2, and Sky Blue B4. The introduction of the Sky Blue sub-pixel B4 not only shares some of the functions of the Deep Blue sub-pixel B2 and bears the display burden of the blue color gamut, but also significantly extends the originally low lifespan of the Sky Blue sub-pixel, thereby further reducing the overall power consumption of the pixel. This technical solution not only fully covers the performance advantages of Example 3, but also achieves a superimposed optimization of the overall performance of the pixel unit through the improvement of the Sky Blue sub-pixel's BI value, achieving a further improvement in technical performance.

[0381] In summary, the novel full-color display provided by this invention comprises multiple pixel units, each pixel unit containing at least four sub-pixels, and at least one sub-pixel being a sensitized device with a maximum emission wavelength greater than 500nm. By synergistically optimizing the performance of each sensitized sub-pixel, this invention achieves a significant improvement in both the color gamut and photoelectric conversion efficiency of the full-color display, thereby obtaining a full-color pixel unit possessing three core characteristics: high luminous efficiency, long lifespan, and high color purity.

[0382] It should be understood that the various embodiments described herein are merely examples and are not intended to limit the scope of the invention. Therefore, as will be apparent to those skilled in the art, the claimed invention may include variations of the specific embodiments and preferred embodiments described herein. Many of the materials and structures described herein can be substituted with other materials and structures without departing from the spirit of the invention. It should be understood that various theories regarding why the invention works are not intended to be limiting.

Claims

1. A full-color display comprising multiple pixel units, wherein, Each pixel unit contains at least a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel, and each sub-pixel contains at least one light-emitting layer; The first sub-pixel includes at least a first light-emitting layer, and the first light-emitting layer includes at least a first sensitizer and a first light-emitting material; The second sub-pixel includes at least a second light-emitting layer, and the second light-emitting layer includes at least a second light-emitting material; The third sub-pixel includes at least a third light-emitting layer, and the third light-emitting layer includes at least a third light-emitting material; The fourth sub-pixel includes at least a fourth light-emitting layer, and the fourth light-emitting layer includes at least a fourth light-emitting material; The maximum emission wavelength of the photoluminescence spectrum of the first luminescent material is 500-700 nm.

2. The full-color display as described in claim 1, wherein, The first sub-pixel is at 1000 cd / m 2 External quantum efficiency at brightness ≥26%; Preferably, at 1000 cd / m 2 External quantum efficiency at brightness ≥28%.

3. The full-color display as described in claim 1, wherein, The first sub-pixel is at 1000 cd / m 2 The full width at half maximum (FWHM) at brightness is ≤35nm; Preferably, at 1000 cd / m 2 The full width at half maximum (FWHM) at brightness is ≤31nm.

4. The full-color display as described in claim 1, wherein in the first light-emitting layer, the absolute value of the difference between the maximum wavelength λ1 of the photoluminescence spectrum of the first sensitizer and the maximum wavelength λ2 of the photoluminescence spectrum of the first light-emitting material is ≤50nm; Preferably, the absolute value of the difference is ≤30nm.

5. The full-color display as described in claim 1, wherein, The maximum emission wavelength of the photoluminescence spectrum of the second luminescent material is 500-570 nm or 571-700 nm; Preferably, the second light-emitting layer further comprises a second sensitizer.

6. The full-color display as described in claim 5, wherein, The maximum emission wavelength of the photoluminescence spectrum of the third luminescent material is 450-499 nm; Preferably, the third light-emitting layer further comprises a third sensitizer.

7. The full-color display as claimed in claim 6, wherein, The maximum emission wavelength of the photoluminescence spectrum of the fourth luminescent material is 466-499 nm; Preferably, the fourth light-emitting layer further comprises a fourth sensitizer.

8. The full-color display as claimed in claim 7, wherein, The first sensitizer and the second sensitizer are each independently selected from phosphorescent materials, wherein the phosphorescent material is a metal complex, and the metal complex has M(L) a ) m (L b ) n (L c ) q The general formula; M is selected from metals with a relative atomic mass greater than 40; ligand L a L b and L c The first ligand, second ligand, and third ligand, respectively, are coordinated with the metal M, and ligand L is... a L b and L c They can be the same or different; ligand L a L b and L c They can be selectively linked to form multidentate ligands; m is 1, 2, or 3; n is 0, 1, or 2; q is 0, 1, or 2; the sum of m, n, and q equals the oxidation state of metal M; when m is greater than or equal to 2, multiple L a They can be the same or different; when n is 2, the two Ls b They can be the same or different; when q is 2, the two Ls c They can be the same or different; The ligand L a It has a structure shown in any one of Equations 2-1 to 2-18: In Equations 2-1 to 2-18, V1 and V2 are selected from C or N each time they appear; T1-T 12 Each time it appears, it is selected from CR in the same or different ways. T Or N; V and Z are selected from O, S, Se, NR1', CR1'R1', SiR1'R1', GeR1'R1', or combinations thereof, either the same or different each time they appear; when multiple R1's exist simultaneously, the multiple R1's are the same or different. X3 to X8 are selected from CR'2 or N each time they appear in the same or different ways; Y'1 to Y'4 are selected from CR'1 or N each time they appear in the same or different ways; R'1, R'2, R1' and R T Each time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms; Adjacent substituents R'1, R'2, R1' and R T They can be arbitrarily connected to form a loop; Preferably, the metal complex has a structure represented by any one of the formulas Ma-1 to Ma-9 and Mb-1 to Mb-5: Among them, ring A 1’ Ring A2, Ring A 22 Each time ring A3 appears, it is selected from aromatic rings having 6-30 ring atoms, heteroaromatic rings having 5-30 ring atoms, or combinations thereof, either identically or differently. Ring A 21 Selected from heteroaromatic rings with 5 ring atoms; E1 to E4, Y2, Y3, Y5 to Y 10 Each occurrence is either identical or different and is selected from C or N; Y1'-Y4' are selected from CR each time they appear, either identically or differently. y1’ Or N; When X3-X8 appear, select CR' either the same or different each time. 21 CR' 22 Or N; and at least one of X3-X8 is selected from CR' 21 The R' 21 Selected from cyano or fluorine; G1 is selected from O or S each time it appears, either the same or different. T1-T 12 Each time it appears, it is selected from CR in the same or different ways. T Or N; V and Z are each independently selected from O, S, or Se; Y1, Y4, Y 11 Each occurrence is selected from CR”', N, NR”', O or S, either identically or differently; Each time m appears, it is selected from 0, 1, 2, or 3, either the same or different. R a’ R b’ R1, R2, R3, and R4 appearing the same or different each time indicate monosubstitution, polysubstitution, or no substitution; R a’ R b’ R a R b R c R y1’ R1, R2, R3, R4, R' 22 ,R”',R T Each time it appears, it is selected from the group consisting of the same or different groups of the following: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic carbon atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and substituted or unsubstituted alkyl groups having 1-20 carbon atoms. Alkynyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium groups having 6-20 carbon atoms, substituted or unsubstituted amino, acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphinyl, and combinations thereof having 0-20 carbon atoms; Adjacent substituent R a’ R b’ R y1’ R T R1, R2, R3, and R4 can be optionally connected to form a loop.

9. The full-color display as claimed in claim 1, wherein, The first luminescent material and the second luminescent material are each independently selected from structures represented by any one of Equations 5-1-1 to 5-1-3: In Formulas 5-1-1 to 5-1-3, ring A, ring B, ring C, ring D and ring E are each independently selected from five-membered unsaturated carbon rings, aromatic rings having 6 to 30 carbon atoms, heteroaromatic rings having 3 to 30 carbon atoms, or combinations thereof; E1 through E4 are each independently selected from single bonds, BR z CR z R z SiR z R z GeR z R z NR z PR z P = O(R) z ), O, S, S=O, Se or Se=O; When multiple R exist simultaneously z At that time, multiple R z Same or different; R a1 R b1 R c1 R d1 R e1 Each occurrence, whether identical or different, indicates monosubstitution, polysubstitution, or no substitution; R a1 R b1 R c1 R d1 R e1 R z Each occurrence is selected from the group consisting of, either identically or differently, of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 cyclic carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 cyclic atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, substituted or unsubstituted aroxy groups having 6-30 carbon atoms, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, and so on. The following are substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanium groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanium alkyl groups having 6-20 carbon atoms, substituted or unsubstituted amino groups having 0-20 carbon atoms, BR'R', acyl, carbonyl, carboxylic acid, ester, cyano, isocyano, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphin, and combinations thereof. R', each time appearing, is selected from the group consisting of: hydrogen, deuterium, halogen, substituted or unsubstituted alkyl groups having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3-20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1-20 carbon atoms, substituted or unsubstituted heterocyclic groups having 3-20 ring atoms, substituted or unsubstituted aralkyl groups having 7-30 carbon atoms, substituted or unsubstituted alkoxy groups having 1-20 carbon atoms, and substituted or unsubstituted aralkyl groups having 6-30 carbon atoms. Oxygen groups, substituted or unsubstituted alkenyl groups having 2-20 carbon atoms, substituted or unsubstituted aryl groups having 6-30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3-30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3-20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6-20 carbon atoms, substituted or unsubstituted alkylgermanyl groups having 3-20 carbon atoms, substituted or unsubstituted arylgermanyl groups having 6-20 carbon atoms, substituted or unsubstituted amino groups having 0-20 carbon atoms, BR 1 'R 1 Acyl, carbonyl, carboxylic acid, ester, cyano, isocyanate, hydroxyl, mercapto, sulfinyl, sulfonyl, phosphine, and combinations thereof; Adjacent substituent R a1 R b1 R c1 R d1 R e1 R z 、R'、R 1 They can be arbitrarily connected to form a loop.

10. The full-color display as claimed in claim 6, wherein, The maximum emission wavelength of the photoluminescence spectrum of the first luminescent material is 500-570 nm. The maximum emission wavelength of the photoluminescence spectrum of the second luminescent material is 500-570 nm. The maximum emission wavelength of the photoluminescence spectrum of the third luminescent material is 450-465 nm. The maximum emission wavelength of the photoluminescence spectrum of the fourth luminescent material is 571-700 nm.

11. The full-color display as claimed in claim 7, wherein, The maximum emission wavelength of the photoluminescence spectrum of the first luminescent material is 500-570 nm. The maximum emission wavelength of the photoluminescence spectrum of the second luminescent material is 571-700 nm. The maximum emission wavelength of the photoluminescence spectrum of the third luminescent material is 450-465 nm. The maximum emission wavelength of the photoluminescence spectrum of the fourth luminescent material is 466-499 nm.

12. The full-color display as claimed in claim 1, wherein the first light-emitting layer, the second light-emitting layer, the third light-emitting layer and the fourth light-emitting layer further comprise a first host material or comprise a first host material and a second host material.

Images