Organic electroluminescent display panel

Abstract

Disclosed is an organic electroluminescent display panel. The display panel comprises a substrate, and at least two organic electroluminescent devices are arranged on the substrate. Red light and green light emitting materials with the half-peak width difference of photoluminescence spectrums within a specific range are matched and applied to a red light device and a green light device of the display panel, so that the brightness attenuation amplitudes of red light and green light of the display panel at different visual angles are basically the same; therefore, the phenomenon that one of the pictures presented in the display panel is relatively green or red due to relatively strong attenuation is avoided, so that the pictures with relatively high colors are presented at different viewing angles, and the problem of color cast of the panel at different viewing angles is solved.

Description

Technical Field

[0001] The present invention relates to a display panel, and in particular to an organic electroluminescent display panel and an electronic component comprising the organic electroluminescent display panel. Background Art

[0002] Full-color displays are currently widely used in our work and life, such as mobile phone displays, computer displays, shopping mall advertising displays, etc. They are mainly used to display text, graphics, videos and other information. Full-color displays display various colors by controlling the brightness of RGB sub-pixels. In addition to considering brightness, life, white balance effect and other characteristics, viewing angle is also one of the important characteristics for judging the display quality when evaluating the quality of a full-color display.

[0003] The viewing angle generally refers to the difference between the colors that a display can express at different viewing angles and at a normal viewing angle (the human eye's line of sight is at a 90-degree angle to the screen). The greater the deviation in color and / or brightness at different angles from the normal viewing angle, the smaller the viewing angle range and the greater the color deviation, resulting in a worse viewing experience at a larger viewing angle. For example, a very realistic picture viewed at a normal viewing angle, when viewed at a wide angle, because the brightness of the three colors of red, green and blue decay differently at different viewing angles, some colors are too bright while others are too dim, resulting in distorted images and colors.

[0004] AMOLED technology has become the mainstream display technology for small and medium-sized screens, including mobile phones. Currently, most AMOLED displays use a top-emitting device structure. The microcavity effect in this structure causes the light emission of OLED devices to no longer show a Lambertian emission effect. On the contrary, the light intensity at the normal viewing angle is usually greater than that at other viewing angles, which will cause the above-mentioned color shift problem. How to reduce the color shift problem of display panels is what researchers in the field have been exploring.

[0005] The half-width of the luminescent material is one of the important indicators for evaluating its performance parameters. With the continuous development of OLED materials, luminescent materials with narrower half-width are considered to have higher efficiency and higher color purity, and are thus continuously iterated into the screens of electronic products. However, luminescent materials with narrow peak widths tend to further aggravate the color shift phenomenon in top-emitting devices. Of course, in the display field, it is not required that the panel has no color shift phenomenon at all, but that the brightness and color changes of different pixels in the panel at different viewing angles are as close as possible to ensure that its white balance is not affected by changes in viewing angle. This is also what industry insiders have been continuously researching.

[0006] Patent CN111312775B discloses a pixel unit and a display panel thereof, as well as a brightness compensation method for a display panel, which adjusts the decay speed of each color light by setting the number, luminous area and / or arrangement of first-type sub-pixels and second-type sub-pixels in the pixels of the same color of the display panel, thereby improving the color deviation of the viewing angle. However, the application does not focus on the influence of the relationship between the half-peak widths of pixels of different colors on the brightness attenuation, and does not disclose what half-peak width relationship different color pixels have in the panel to improve the color deviation problem while ensuring efficiency and color purity.

[0007] Patent application CN111293149A discloses a display panel and a method for manufacturing the same, which adds a light-absorbing layer to the light-emitting side of the device so that the spectrum of the device emission spectrum to the right of the maximum emission wavelength is absorbed, thereby achieving the purpose of narrowing the spectrum and thus improving the device color gamut and improving color deviation. Similarly, the application does not focus on the impact of the relationship between the half-peak widths of pixels of different colors on brightness attenuation, and does not disclose what half-peak width relationship different color pixels have in the panel to improve the color deviation problem while ensuring efficiency and color purity.

[0008] In summary, how to ensure the efficiency and color purity of OLED while coordinating the performance of different pixels in the display panel at a wide viewing angle and further improve the color shift problem is an urgent problem to be solved. Summary of the invention

[0009] The present invention aims to provide a series of novel organic electroluminescent display panels to solve at least some of the above problems. The novel display panel disclosed in the present invention uses a combination of red and green luminescent materials with a difference in half-peak width within a specific range and applies them to the red and green light devices of the panel, ensuring that the brightness attenuation trends of the two are consistent at different angles, thereby improving the color deviation problem of the panel at different viewing angles.

[0010] According to one embodiment of the present invention, an organic electroluminescent display panel is disclosed, comprising a base substrate on which at least two organic electroluminescent devices are arranged;

[0011] The first organic electroluminescent device comprises: a first anode, a first cathode and a first light-emitting layer arranged between the first anode and the first cathode; the first light-emitting layer comprises a first light-emitting doping material, and the maximum emission wavelength of the photoluminescence spectrum thereof is λ1, and the corresponding half-peak width is FWHM1;

[0012] The second organic electroluminescent device comprises: a second anode, a second cathode and a second light-emitting layer arranged between the second anode and the second cathode; the second light-emitting layer comprises a second light-emitting doping material, and the maximum emission wavelength of the photoluminescence spectrum thereof is λ2, and the corresponding half-peak width is FWHM2;

[0013] Among them, 500nm≤λ1<600nm;λ2≥600nm;

[0014] FWHM1 and FWHM2 are both less than or equal to 40nm; and FWHM2-FWHM1≥-15nm.

[0015] According to another embodiment of the present invention, an electronic component is disclosed, which includes the organic electroluminescent display panel described in the above embodiment.

[0016] The present invention selects red and green luminescent materials whose half-peak width difference of photoluminescence (PL) spectra is within a specific range and applies them to the red and green light devices of the display panel, thereby ensuring that the brightness attenuation amplitudes of the red and green lights of the display panel are substantially the same at different viewing angles, so that the picture presented in the display panel will not become more green or red due to the stronger attenuation of one of the two, thereby presenting a picture with relatively high-quality colors at different viewing angles, and improving the color cast problem of the panel at different viewing angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an organic electroluminescent device 100 provided in a specific embodiment of the present invention.

[0018] Figure 2a A schematic diagram of the structure of a device 200 for simulating red and green light in the present invention.

[0019] Figure 2b A refractive index curve of the HIL of the device structure 200 of the present invention.

[0020] Figure 2c Refractive index curve of the HTL of the device structure 200 of the present invention.

[0021] Figure 2d Refractive index profile of the EBL of the device structure 200 of the present invention.

[0022] Figure 2e A refractive index curve of the EML of the device structure 200 of the present invention.

[0023] Figure 2f Refractive index curve of the HBL of the device structure 200 of the present invention.

[0024] Figure 2g A refractive index curve of the ETL of the device structure 200 of the present invention.

[0025] Figure 2h Refractive index curve of cathode MgAg of the device structure 200 of the present invention.

[0026] Figure 2iA refractive index curve of the CPL of the device structure 200 of the present invention.

[0027] Figure 3a Schematic diagrams of spectra S1-100, S1-80, S1-60, S1-40, S1-20, S2-1 to S2-3 used to simulate the designed organic electroluminescent device in the present invention.

[0028] Figure 3b Schematic diagrams of spectra S3-100, S3-80, S3-60, S3-40, S3-20 and S4-1 to S4-3 used to simulate the designed organic electroluminescent device in the present invention.

[0029] Figure 4a Schematic diagrams of spectra S5 to S10 used to simulate the designed organic electroluminescent device in the present invention.

[0030] Figure 4b Schematic diagram of brightness attenuation of the analog device corresponding to spectra S5 to S10 at a viewing angle of 0° to 60° in the present invention.

[0031] Figure 5a Schematic diagrams of the spectra S-520-30, S-520-35, and S-520-40 used to simulate the designed organic electroluminescent device in the present invention.

[0032] Figure 5b Schematic diagrams of spectra S-622-30 and S-622-40 used to simulate the designed organic electroluminescent device in the present invention. DETAILED DESCRIPTION

[0033] As used herein, "top" means farthest from the substrate, while "bottom" means closest to the substrate. In the case where a first layer is described as being "disposed on" a second layer, the first layer is disposed farther from the substrate. Conversely, in the case where a first layer is described as being "disposed under" a second layer, the first layer is disposed closer to the substrate. Unless it is specified that the first layer is "in contact with" the second layer, other layers may exist between the first and second layers. For example, the cathode may be described as being "disposed on" the anode even if various organic layers are present between the cathode and the anode.

[0034] As used herein, the term "OLED device" includes an anode layer, a cathode layer, and one or more organic layers disposed between the anode layer and the cathode layer. An "OLED device" can be bottom-emitting (bottom-emitting), i.e., emitting light from the anode side, or top-emitting (top-emitting), i.e., emitting light from the cathode side, or a bifacial light-emitting device, i.e., emitting light from both the anode and the cathode.

[0035] As used herein, the term "encapsulation layer" may be a thin film encapsulation with a thickness of less than 100 micrometers, which includes placing one or more thin films directly on the device, or may also be a cover glass adhered to a substrate.

[0036] As used herein, the term "color coordinates" refers to the corresponding coordinates in the CIE 1931 color space.

[0037] A typical top-emitting OLED device structure is as follows: Figure 1 The OLED device 100 includes: an anode 110, a hole injection layer (HIL) 120, a hole transport layer (HTL) 130, an electron blocking layer (EBL) 140 (also referred to as a prime layer), an emitting layer (EML) 150, a hole blocking layer (HBL) 160, the hole blocking layer 160 is an optional layer, an electron transport layer (ETL) 170, an electron injection layer (EIL) 180, a cathode 181, a capping layer 182, and an encapsulation layer 190. The anode 110 is a material or a combination of materials with high reflectivity, including but not limited to Ag, Al, Ti, Cr, Pt, Ni, TiN, and a combination of the above materials with ITO and / or MoOx (molybdenum oxide). The reflectivity of the anode is usually greater than 50%; preferably, the reflectivity of the anode is greater than 70%; more preferably, the reflectivity of the anode is greater than 80%; and the cathode 181 should be a semi-transparent or transparent conductive material, including but not limited to MgAg alloy, MoOx, Yb, Ca, ITO, IZO, or a combination thereof, and its average transmittance for light with a wavelength in the visible light region is greater than 15%; preferably, the average transmittance for light with a wavelength in the visible light region is greater than 20%; more preferably, the average transmittance for light with a wavelength in the visible light region is greater than 25%. The hole injection layer 120 can be a single material layer, such as the commonly used HATCN; the hole injection layer 120 can also be a hole transport material doped with a certain proportion of p-type conductive doping material, the doping ratio is usually not higher than 5%, and is commonly between 1% and 3%. The electron blocking layer (EBL) 140 is an optional layer, but in order to better match the energy level of the main material, a device structure with an EBL is usually used. The thickness of the hole transport layer is generally between 100nm and 200nm. Since the top-emitting device has a microcavity effect, the microcavity of the device is usually adjusted by adjusting the thickness of the hole transport layer. For example, in order to achieve the best microcavity effect of a top-emitting OLED device, that is, the current efficiency reaches the highest value CE max, the usual practice is to fix the thickness of the EBL, and then adjust the microcavity by adjusting the thickness of the HTL; in this article, the study of the color shift problem is based on the luminous point corresponding to when the current efficiency reaches the maximum value. It is obvious that those skilled in the art can understand that for two top-emitting devices, if the difference between them is only the material used in one organic layer of the device, for example, different organic materials are used only in the EBL (other functional layers are the same), then, since the refractive index of different organic materials in the EBL may be slightly different, the optimal microcavity lengths of the two top-emitting devices may be slightly different.

[0038] As used herein, the term "simulation" refers to optical simulation performed only through the refractive index curve and thickness of each layer of material in the device, and does not include electrical simulation; the simulation software used in the present invention is Setfos5.1.1 semiconductor thin film optical simulation software developed by FLUXIM. The schematic diagram of the device structure used in the simulation is shown in Figure 2. Specifically, in The first electrode (i.e. anode) is made of ITO on a glass substrate of / Ag / ITO Three-layer structure, HIL (hole injection layer) is formed by compounds HT and HI (weight ratio is 97:3), thickness The HTL (hole transport layer) is formed by the compound HT. Since the HTL is a microcavity adjustment layer, the thickness of the HTL is optimized, about An EBL (electron blocking layer) with a thickness of 1000 nm was formed on the HTL using compound EB-2. On the EBL, the compound GH-1, the compound GH-2 and the green organic light emitting doping material are formed together (the weight ratio of the green light emitting layer, the compound GH-1, the compound GH-2 and the green organic light emitting doping material is 48:48:4) or the compound RH-1 and the red organic light emitting doping material are formed together. EML (the red light emitting layer, the weight ratio of the compound RH-1 and the red organic light emitting doping material is 96:4), with a thickness of In optical simulation, the PL spectrum of the luminescent doping material can also be substituted into the EML layer for simulation; on the EML, a HBL (hole blocking layer) is formed by compound HB with a thickness of On the HBL, the ETL (electron transport layer) is formed of compound ET and compound Liq (weight ratio is 40:60) with a thickness of On the ETL is the second electrode (ie, cathode), which is formed of an alloy of Mg and Ag (Mg:Ag weight ratio is 10:90) with a thickness of The cathode is formed with a CPL (capping layer) made of compound CPL-1, with a thickness of Use on CPL The glass with the thickness of 100mm is used as the encapsulation layer; the specific structure of the above compound is shown below. In the software, the light emitting area (Position) is set to 0.5, and the conversion efficiency factor (Conversion efficiency) is set to 0.7. Since Setfos 5.1.1 is an optical simulation software, it is only necessary to determine the thickness and refractive index of each layer of the device structure during simulation (the refractive index used in each organic layer is the material thickness of The corresponding refractive index when the light emitting element is 200 nm), so the above-mentioned materials of each layer are only examples and are not limiting. By inputting the PL spectrum data of the organic light-emitting doping material used in the EML into the simulation software, the performance changes brought to the device by the organic light-emitting doping materials with different PL spectra can be simulated. In addition, as known to those skilled in the art, in the process of optical simulation, only optical parameters are considered without considering electrical factors (such as the internal quantum efficiency or external quantum efficiency of different light-emitting doping materials, etc.), so the external quantum efficiency of different light-emitting doping materials is assumed to be the same in the simulation.

[0039] As used herein, "refractive index", i.e., optical refractive index (n), refers to the ratio of the speed of light propagating in a vacuum to the speed of light propagating in the medium (material). The refractive index test method of the organic material and cathode layer in this article is as follows: in an Angstrom Engineering evaporation machine, a material with a thickness of 30nm is evaporated on a silicon wafer, and the refractive index curve with a wavelength of 450nm-800nm ​​is obtained by the ellipsometer test of Beijing Liangtuo Technology Co., Ltd. The refractive index curve of each layer in the device structure 200 used in the simulation is shown in the figure below. Figures 2b to 2i As shown; the glass substrate Glass, ITO and Ag use the refractive index curve provided in the software.

[0040] As used herein, the test method for the PL spectrum of the organic light-emitting doping material is as follows: the test is performed using a fluorescence spectrophotometer model No. 98 produced by Shanghai No. 9 Technology Co., Ltd. to measure the photoluminescence spectrum (PL) and half-peak width data of the material to be tested; specifically, the sample of the material to be tested is prepared with HPLC grade toluene to a concentration of 1×10 -6 mol / L solution, nitrogen was passed through the prepared solution for deoxygenation for 5 minutes, and then the emission spectrum was measured at room temperature (298K) with light of 500nm wavelength, and the half-peak width data was directly read from the spectrum.

[0041] As used herein, a "shoulder" of a spectrum refers to a shoulder on the right side of the spectrum, such a shoulder being due to electronic vibrational energy levels.

[0042] As used herein, "the corresponding brightness L0 at 0°" means that the device reaches CE at a viewing angle of 0° (i.e., under normal viewing angle conditions). max The corresponding brightness value at 30° is the brightness L30 at a viewing angle of 30°. max The brightness value corresponding to the time. "Brightness attenuation value D" refers to the value obtained by dividing the brightness L30 at a 30° viewing angle by the brightness L0 at a 0° viewing angle. This value is often used in the display industry to express the brightness attenuation of a device as the viewing angle changes. For example, at the same viewing angle, the larger the D, the smaller the brightness attenuation of the device.

[0043] Definition of Substituent Terms

[0044] Halogen or halide - as used herein includes fluorine, chlorine, bromine and iodine.

[0045] Alkyl - as used herein, includes straight chain and branched alkyl groups. The alkyl group may 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-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, neopentyl, 1-methylpentyl, 2-methylpentyl, 1-pentylhexyl, 1-butylpentyl, 1-heptyloctyl, 3-methylpentyl. Among the above, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, neopentyl and n-hexyl are preferred. In addition, the alkyl group may be optionally substituted.

[0046] Cycloalkyl - as used herein, includes cyclic alkyl. Cycloalkyl can be a cycloalkyl having 3 to 20 ring carbon atoms, preferably a cycloalkyl having 4 to 10 carbon atoms. Examples of cycloalkyl 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, 4,4-dimethylcyclohexyl are preferred. In addition, cycloalkyl can be optionally substituted.

[0047] Heteroalkyl - As used herein, a heteroalkyl group comprises one or more carbons in an alkyl chain substituted with a heteroatom selected from the group consisting of a nitrogen atom, an oxygen atom, a sulfur atom, a selenium atom, a phosphorus atom, a silicon atom, a germanium atom and a boron atom. The heteroalkyl group may 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 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. In addition, heteroalkyl may be optionally substituted.

[0048] Alkenyl - as used herein, encompasses straight chain, branched and cyclic olefin groups. Alkenyl can be an alkenyl containing 2 to 20 carbon atoms, preferably an alkenyl having 2 to 10 carbon atoms. Examples of alkenyl 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, cycloheptatrienyl, cyclooctenyl, cyclooctatetraenyl and norbornenyl. Additionally, alkenyl groups may be optionally substituted.

[0049] Alkynyl - as used herein, encompasses straight chain alkynyl. Alkynyl may be an alkynyl containing 2 to 20 carbon atoms, preferably an alkynyl having 2 to 10 carbon atoms. Examples of alkynyl include ethynyl, propynyl, propargyl, 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, propargyl, 1-butynyl, 2-butynyl, 3-butynyl, 1-pentynyl, phenylethynyl, etc. are preferred. In addition, alkynyl may be optionally substituted.

[0050] Aryl or aromatic group - As used herein, both non-fused and fused systems are contemplated. The aryl group may 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, phenanthrene, fluorene, pyrene, Perylene and azulene, preferably phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. Examples of non-condensed 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'-methylbiphenyl, 4"-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl and m-quadrenyl. In addition, the aryl group may be optionally substituted.

[0051] Heterocyclic or heterocyclic - as used herein, non-aromatic cyclic groups are contemplated. 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 atoms, oxygen atoms, sulfur atoms, selenium atoms, silicon atoms, phosphorus atoms, germanium atoms and boron atoms, and 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 oxirane, oxetanyl, tetrahydrofuranyl, tetrahydropyranyl, dioxopentanyl, dioxanyl, aziridinyl, dihydropyrrolyl, tetrahydropyrrolyl, piperidinyl, oxazolidinyl, morpholinyl, piperazinyl, oxepinyl, thiepinyl, azepine and tetrahydrothioxolyl. Additionally, the heterocyclyl group may be optionally substituted.

[0052] Heteroaryl - As used herein, non-fused and fused heteroaromatic groups may contain 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 atoms. Heteroaryl also refers to heteroaryl. The heteroaryl may 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, indole, carbazole, pyridine, indole, pyrrolopyridine, pyrazole, imidazole, triazole, oxazole, thiazole, oxadiazole, oxatriazole, dioxazole, thiadiazole, pyridine, pyridazine, pyrimidine, pyrazine, triazine, oxazine, oxathiazine, oxadiazine, indole, benzimidazole, indazole, indenozine, benzoxazole, benzisoxazole, benzothiazole, quinoline, isoquinoline, In some embodiments, the heteroaryl group is substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In some embodiments, the heteroaryl group is substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In some embodiments, the heteroaryl group is substituted with 1,2-azaborine, 1,3-azaborine, 1,4-azaborine, borazole and its aza analogs. In addition, the heteroaryl group may be optionally substituted.

[0053] Alkoxy-as used herein, represented by -O-alkyl, -O-cycloalkyl, -O-heteroalkyl or -O-heterocyclyl. Examples and preferred examples of alkyl, cycloalkyl, heteroalkyl and heterocyclyl are the same as described above. Alkoxy can be an alkoxy having 1 to 20 carbon atoms, preferably an alkoxy having 1 to 6 carbon atoms. Examples of alkoxy include methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, tetrahydrofuranyloxy, tetrahydropyranyloxy, methoxypropyloxy, ethoxyethyloxy, methoxymethyloxy and ethoxymethyloxy. In addition, alkoxy can be optionally substituted.

[0054] Aryloxy - as used herein, represented by -O-aryl or -O-heteroaryl. Examples and preferred examples of aryl and heteroaryl are the same as above. Aryloxy can be an aryloxy having 6 to 30 carbon atoms, preferably an aryloxy having 6 to 20 carbon atoms. Examples of aryloxy include phenoxy and biphenyloxy. In addition, aryloxy can be optionally substituted.

[0055] Aralkyl - as used herein, encompasses aryl-substituted alkyl groups. Aralkyl groups may be aralkyl groups having 7 to 30 carbon atoms, preferably aralkyl groups having 7 to 20 carbon atoms, and more preferably aralkyl groups having 7 to 13 carbon atoms. Examples of aralkyl 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, substituted alkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl, arylalkyl,

[0056] Alkylsilyl - As used herein, alkyl substituted silicon groups are contemplated. The alkylsilyl group may be an alkylsilyl group having 3-20 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, tri-tert-butylsilyl, triisobutylsilyl, dimethyltert-butylsilyl, methyldi-tert-butylsilyl. In addition, the alkylsilyl group may be optionally substituted.

[0057] Arylsilyl - as used herein, encompasses at least one aryl-substituted silicon group. The arylsilyl group may be an arylsilyl group having 6 to 30 carbon atoms, preferably an arylsilyl group having 8 to 20 carbon atoms. Examples of arylsilyl groups include triphenylsilyl, phenyldiphenylsilyl, diphenylbiphenylsilyl, phenyldiethylsilyl, diphenylethylsilyl, phenyldimethylsilyl, diphenylmethylsilyl, phenyldiisopropylsilyl, diphenylisopropylsilyl, diphenylbutylsilyl, diphenylisobutylsilyl, diphenyltert-butylsilyl. In addition, the arylsilyl group may be optionally substituted.

[0058] Alkylgermanyl - As used herein, alkyl substituted germanyl is contemplated. The alkylgermanyl may be an alkylgermanyl having 3-20 carbon atoms, preferably an alkylgermanyl having 3 to 10 carbon atoms. Examples of alkylgermanyl include trimethylgermanyl, triethylgermanyl, methyldiethylgermanyl, ethyldimethylgermanyl, tripropylgermanyl, tributylgermanyl, triisopropylgermanyl, methyldiisopropylgermanyl, dimethylisopropylgermanyl, tri-tert-butylgermanyl, triisobutylgermanyl, dimethyltert-butylgermanyl, methyldi-tert-butylgermanyl. In addition, the alkylgermanyl may be optionally substituted.

[0059] Arylgermanyl - as used herein, encompasses germanyl substituted with at least one aryl or heteroaryl group. The arylgermanyl may be an arylgermanyl having 6 to 30 carbon atoms, preferably an arylgermanyl having 8 to 20 carbon atoms. Examples of arylgermanyl include triphenylgermanyl, phenyldibiphenylgermanyl, diphenylbiphenylgermanyl, phenyldiethylgermanyl, diphenylethylgermanyl, phenyldimethylgermanyl, diphenylmethylgermanyl, phenyldiisopropylgermanyl, diphenylisopropylgermanyl, diphenylbutylgermanyl, diphenylisobutylgermanyl, diphenyltert-butylgermanyl. In addition, the arylgermanyl may be optionally substituted.

[0060] The term "aza" in azadibenzofuran, azadibenzothiophene, etc. means that one or more CH groups in the corresponding aromatic fragment are replaced by a nitrogen atom. For example, azatriphenylene includes dibenzo[f,h]quinoxaline, dibenzo[f,h]quinoline and other analogs having two or more nitrogens in the ring system. Other nitrogen analogs of the above-mentioned aza derivatives can be easily thought of by those of ordinary skill in the art, and all such analogs are determined to be included in the terms described herein.

[0061] In the present disclosure, unless otherwise defined, when any one of the terms in the group consisting of substituted alkyl, substituted cycloalkyl, substituted heteroalkyl, substituted heterocyclyl, substituted aralkyl, substituted alkoxy, substituted aryloxy, substituted alkenyl, substituted alkynyl, substituted aryl, substituted heteroaryl, substituted alkylsilyl, substituted arylsilyl, substituted alkylgermanyl, substituted arylgermanyl, substituted amino, substituted acyl, substituted carbonyl, substituted carboxylic acid, substituted ester , substituted hydroxyl, substituted mercapto, substituted sulfinyl, substituted sulfonyl, substituted phosphino, refers to alkyl, cycloalkyl, heteroalkyl, heterocyclic, aralkyl, alkoxy, aryloxy, alkenyl, alkynyl, aryl, heteroaryl, alkylsilyl, arylsilyl, alkylgermanyl, arylgermanyl, amino, acyl, carbonyl, carboxylic acid, ester, hydroxyl, mercapto, sulfinyl, sulfonyl and phosphino, any one of which may be selected from deuterium, halogen, unsubstituted 1-20 carbon atoms alkyl, unsubstituted cycloalkyl having 3-20 carbon atoms, unsubstituted heteroalkyl having 1-20 carbon atoms, unsubstituted heterocyclyl having 3-20 carbon atoms, unsubstituted aralkyl having 7-30 carbon atoms, unsubstituted alkoxy having 1-20 carbon atoms, unsubstituted aryloxy having 6-30 carbon atoms, unsubstituted alkenyl having 2-20 carbon atoms, unsubstituted alkynyl having 2-20 carbon atoms, unsubstituted cycloalkyl having 3-20 carbon atoms, unsubstituted heteroalkyl having 1-20 carbon atoms, unsubstituted aryloxy having 6-30 carbon atoms, unsubstituted cycloalkyl having 3-20 carbon atoms, unsubstituted cycloalkyl having 1 ... The present invention is substituted with an unsubstituted aryl group having 3 to 30 carbon atoms, an unsubstituted heteroaryl group having 3 to 30 carbon atoms, an unsubstituted alkylsilyl group having 3 to 20 carbon atoms, an unsubstituted arylsilyl group having 6 to 20 carbon atoms, an unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, an unsubstituted arylgermanyl group having 6 to 20 carbon atoms, an unsubstituted amino group, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group and a combination thereof having 0 to 20 carbon atoms.

[0062] It should be understood that when describing a molecular fragment as a substituent or otherwise attached to another moiety, its name can be written according to whether it is a fragment (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 a substituent or attaching a fragment are considered equivalent.

[0063] In the compounds mentioned in this disclosure, hydrogen atoms may be partially or completely replaced by deuterium. Other atoms such as carbon and nitrogen may also be replaced by their other stable isotopes. The replacement of other stable isotopes in the compounds may be preferred because it enhances the efficiency and stability of the device.

[0064] In the compounds mentioned in the present disclosure, polysubstitution refers to the range including disubstitution up to the maximum number of available substitutions. When a substituent in the compounds mentioned in the present disclosure represents polysubstitution (including disubstitution, trisubstitution, tetrasubstitution, etc.), it means that the substituent can exist in multiple available substitution positions on its connection structure, and the substituent existing in multiple available substitution positions can be the same structure or different structures.

[0065] In the compounds mentioned in the present disclosure, unless clearly defined, for example, adjacent substituents can be optionally connected to form a ring, otherwise adjacent substituents in the compound cannot be connected to form a ring. In the compounds mentioned in the present disclosure, adjacent substituents can be optionally connected to form a ring, including both the situation where adjacent substituents can be connected to form a ring and the situation where adjacent substituents are not connected to form a ring. When adjacent substituents can be optionally connected to form a ring, the formed ring can be a monocyclic or polycyclic ring (including spirocyclic, bridged ring, condensed ring, etc.), as well as an alicyclic, heteroalicyclic, aromatic or heteroaromatic ring. In this statement, 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.

[0066] The expression that adjacent substituents can be optionally linked to form a ring is also intended to be taken to mean that two substituents bonded to the same carbon atom are linked to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0067]

[0068] The expression that adjacent substituents can be optionally linked to form a ring is also intended to be taken to mean that two substituents bonded to carbon atoms directly bonded to each other are linked to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0069]

[0070] The expression that adjacent substituents can be optionally linked to form a ring is also intended to be taken to mean that two substituents bonded to a further distant carbon atom are linked to each other by a chemical bond to form a ring, which can be exemplified by the following formula:

[0071]

[0072] Furthermore, the statement that adjacent substituents can optionally be linked to form a ring is also intended to be taken to mean that, in the case where one of the two adjacent substituents represents hydrogen, the second substituent is bonded at the position to which the hydrogen atom is bonded, thereby forming a ring. This is exemplified by the following formula:

[0073]

[0074] According to one embodiment of the present invention, an organic electroluminescent display panel is disclosed, comprising a base substrate, on which at least two organic electroluminescent devices are arranged;

[0075] The first organic electroluminescent device comprises: a first anode, a first cathode and a first light-emitting layer arranged between the first anode and the first cathode; the first light-emitting layer comprises a first light-emitting doping material, and the maximum emission wavelength of the photoluminescence spectrum thereof is λ1, and the corresponding half-peak width is FWHM1;

[0076] The second organic electroluminescent device comprises: a second anode, a second cathode and a second light-emitting layer arranged between the second anode and the second cathode; the second light-emitting layer comprises a second light-emitting doping material, and the maximum emission wavelength of the photoluminescence spectrum thereof is λ2, and the corresponding half-peak width is FWHM2;

[0077] Among them, 500nm≤λ1<600nm;λ2≥600nm;

[0078] FWHM1 and FWHM2 are both less than or equal to 40nm; and FWHM2-FWHM1≥-15nm.

[0079] According to an embodiment of the present invention, 15 nm ≥ FWHM2 - FWHM1 ≥ -15 nm.

[0080] According to an embodiment of the present invention, 8nm≥FWHM2-FWHM1≥-8nm.

[0081] According to an embodiment of the present invention, 5nm≥FWHM2-FWHM1≥-5nm.

[0082] According to an embodiment of the present invention, 3nm≥FWHM2-FWHM1≥-3nm.

[0083] According to an embodiment of the present invention, FWHM2-FWHM1≥0.

[0084] According to an embodiment of the present invention, FWHM2-FWHM1≥5.

[0085] According to an embodiment of the present invention, FWHM2-FWHM1≥10.

[0086] According to an embodiment of the present invention, at least one of FWHM1 and FWHM2 is less than or equal to 35 nm.

[0087] According to an embodiment of the present invention, at least one of FWHM1 and FWHM2 is less than or equal to 30 nm.

[0088] According to an embodiment of the present invention, 20 nm ≤ FWHM1 ≤ 30 nm, and 20 nm ≤ FWHM2 ≤ 30 nm.

[0089] According to an embodiment of the present invention, 500nm≤λ1<560nm.

[0090] According to an embodiment of the present invention, 500nm≤λ1<535nm.

[0091] According to an embodiment of the present invention, 515 nm≤λ1<535 nm.

[0092] According to an embodiment of the present invention, 600nm≤λ2<650nm.

[0093] According to an embodiment of the present invention, 610nm≤λ2<640nm.

[0094] According to an embodiment of the present invention, 615nm≤λ2<640nm.

[0095] According to an embodiment of the present invention, the first organic electroluminescent device and the second organic electroluminescent device are both top-emitting devices.

[0096] According to one embodiment of the present invention, the first organic electroluminescent device comprises a first capping layer, and the second organic electroluminescent device comprises a second capping layer.

[0097] According to an embodiment of the present invention, the first capping layer and the second capping layer are made of the same material and / or have the same thickness.

[0098] According to an embodiment of the present invention, the first cathode and the second cathode have the same thickness and / or material.

[0099] According to an embodiment of the present invention, the first capping layer and the second capping layer are the same capping layer.

[0100] According to an embodiment of the present invention, the first cathode and the second cathode are the same electrode.

[0101] According to one embodiment of the present invention, the first cathode and the second cathode contain Yb, Mg, Ag, MoOx, Yb, Ca, ITO, IZO, or a combination thereof.

[0102] According to one embodiment of the present invention, the first cathode and the second cathode comprise a composition of Mg and Ag, and the mass ratio of Mg to Ag in the composition is 0.5:9.5-2:8.

[0103] According to one embodiment of the present invention, the first anode and the second anode are selected from Ag, Al, Ti, Cr, Pt, Ni, TiN, ITO, MoOx, and combinations thereof.

[0104] According to an embodiment of the present invention, the reflectivity of the anode is greater than 50%.

[0105] According to an embodiment of the present invention, the reflectivity of the anode is greater than 70%.

[0106] According to an embodiment of the present invention, the first light-emitting doping material and the second light-emitting doping material are phosphorescent light-emitting doping materials.

[0107] According to one embodiment of the present invention, the substrate also includes a third organic electroluminescent device, wherein the third organic electroluminescent device includes a third light-emitting layer; the third light-emitting layer includes a third light-emitting doping material, and the maximum emission wavelength of the photoluminescence spectrum of the third light-emitting material is λ3, and the half-peak width is FWHM3; wherein FWHM3<35nm; 400≤λ3<500nm; FWHM1–FWHM3≥-15nm.

[0108] According to an embodiment of the present invention, FWHM3≤30nm.

[0109] According to an embodiment of the present invention, FWHM3≤28nm.

[0110] According to an embodiment of the present invention, FWHM3≤25nm.

[0111] According to an embodiment of the present invention, 15 nm ≥ FWHM1 - FWHM3 ≥ -15 nm.

[0112] According to one embodiment of the present invention, 3nm≥FWHM1-FWHM3≥-3nm.

[0113] According to an embodiment of the present invention, FWHM1 - FWHM3 ≥ 0 nm.

[0114] According to an embodiment of the present invention, the third light-emitting layer may further include a fourth light-emitting doping material, and at least one of the fourth light-emitting doping material and the third light-emitting doping material is selected from phosphorescent light-emitting doping materials.

[0115] According to an embodiment of the present invention, the substrate is selected from glass, polyimide or silicon wafer.

[0116] According to one embodiment of the present invention, the brightness attenuation value of the first organic electroluminescent device at a viewing angle of 30° is D1, and the brightness attenuation value of the second organic electroluminescent device at a viewing angle of 30° is D2;

[0117] Among them, -15%≤D1-D2≤15%.

[0118] According to one embodiment of the present invention, -10%≤D1-D2≤10%.

[0119] According to one embodiment of the present invention, the phosphorescent doping material is a metal complex having M(L a ) m (L b ) n (L c ) q The general formula of

[0120] Wherein, the metal M is selected from metals with a relative atomic mass greater than 40;

[0121] L a , L b and L c are the first ligand, the second ligand and the third ligand coordinated with the metal M, respectively, a , L b , L c Can be the same or different;

[0122] L a , L b and L c can optionally be linked to form a multidentate ligand;

[0123] m is 1, 2 or 3; n is 0, 1 or 2; q is 0, 1 or 2; the sum of m, n, q is equal to the oxidation state of metal M; when m is greater than or equal to 2, multiple L a can be the same or different; when n is 2, the two L b can be the same or different; when q is 2, the two L c Can be the same or different;

[0124] Ligand L a Each occurrence is identically or differently selected from a structure represented by Formula 2 or Formula 3:

[0125]

[0126] in,

[0127] Ring B is selected from a five-membered unsaturated carbon ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms each time it appears, the same or different; in Formula 2, R x Each occurrence, identically or differently, indicates mono-, poly- or non-substitution;

[0128] K is selected from a single bond, O or S;

[0129] X is selected from the group consisting of O, S, Se, NR2, CR2R2 and SiR2R2. When two R2 exist at the same time, the two R2 may be the same or different;

[0130] X1-X 12 Each occurrence is selected from C, CR, either identically or differently x or N;

[0131] R2, R x The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amine group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0132] Adjacent substituents in Formula 2 can be optionally linked to form a ring;

[0133] Adjacent substituents in Formula 3 can be optionally linked to form a ring;

[0134] Ligand L b , L c Each occurrence is identically or differently selected from monoanionic bidentate ligands.

[0135] In this context, "adjacent substituents in Formula 2 can be optionally linked to form a ring" is intended to mean adjacent groups of substituents in Formula 2, for example, two substituents Rx Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0136] In this context, "adjacent substituents in Formula 3 can be optionally linked to form a ring" is intended to mean adjacent groups of substituents in Formula 3, for example, two substituents R x Between adjacent substituents R2 and R x Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0137] According to one embodiment of the present invention, the ligand L a Each occurrence is identically or differently selected from a structure represented by Formula 2-1, Formula 2-2, Formula 4 or Formula 5:

[0138]

[0139] in,

[0140] X1-X2, X5-X8 are selected from CR in the same or different ways each time they appear x or N;

[0141] G1-G4 are selected from CR in the same or different manner each time they appear. g or N;

[0142] H1-H4 are selected from CR in the same or different manner at each occurrence h or N;

[0143] Z1 is selected from the group consisting of O, S, Se, NR2, CR2R2, SiR2R2 and GeR2R2; when two R2 exist at the same time, the two R2 are the same or different;

[0144] Ring G is selected, at each occurrence, identically or differently, from a five-membered unsaturated carbocyclic ring, or an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms;

[0145] Ring H is selected, identically or differently on each occurrence, from a heterocyclic ring having 2 to 30 carbon atoms, or a heteroaromatic ring having 2 to 30 carbon atoms;

[0146] R g , R h Each occurrence, identically or differently, indicates mono-, poly- or non-substitution;

[0147] Y is selected from the group consisting of O, S, Se, SiR3R3, GeR3R3, NR3 and PR3. When two R3 are present at the same time, the two R3 may be the same or different;

[0148] L is selected, identically or differently, from B, N or P at each occurrence;

[0149] R2, R3, R x , R g and R h The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amine group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0150] Adjacent substituents in Formula 2-1 can be optionally linked to form a ring;

[0151] Adjacent substituents in formula 2-2 can be optionally linked to form a ring;

[0152] Adjacent substituents in Formula 4 can be optionally linked to form a ring;

[0153] Adjacent substituents in Formula 5 can be optionally linked to form a ring.

[0154] In this context, “adjacent substituents in Formula 2-1 can be optionally linked to form a ring” is intended to mean adjacent substituent groups in Formula 2-1, for example, two substituents R x Between the two substituents R g Between the two substituents R x Between adjacent substituents R g and R x Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0155] In this context, “adjacent substituents in Formula 2-2 can be optionally linked to form a ring” is intended to mean adjacent substituent groups in Formula 2-2, for example, two substituents R x Between the two substituents R h Between the two substituents R g Between two substituents R2, between adjacent substituents R2 and R x Between adjacent substituents R g Between R2 and adjacent substituents R g and R x Between adjacent substituents R h and R x Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0156] In this context, "adjacent substituents in Formula 4 can be optionally linked to form a ring" is intended to mean adjacent groups of substituents in Formula 4, for example, two substituents R x Between the two substituents R g Between two substituents R3, between adjacent substituents R3 and R x Between adjacent substituents R3 and R h Between adjacent substituents R g and R x Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0157] In this context, "adjacent substituents in Formula 5 can be optionally linked to form a ring" is intended to mean adjacent groups of substituents in Formula 5, for example, two substituents R x Between the two substituents R g Between the two substituents R h Between adjacent substituents R h and R x Between adjacent substituents R g and R x Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0158] According to one embodiment of the present invention, in Formula 2-1, at least one of X1 and X2 is selected from CR x , R x Selected from deuterium.

[0159] According to one embodiment of the present invention, in Formula 2-1, X1 and X2 are selected from CR x , Rx Selected from deuterium.

[0160] According to one embodiment of the present invention, the ligand L a It has a structure represented by formula 4-1:

[0161]

[0162] wherein Ring G and Ring I are identically or differently selected from a five-membered unsaturated carbocyclic ring, an aromatic ring having 6 to 30 carbon atoms, or a heteroaromatic ring having 3 to 30 carbon atoms each time they appear;

[0163] Y is selected from the group consisting of O, S, Se, SiR3R3, GeR3R3, NR3 and PR3; when two R3 are present at the same time, the two R3 may be the same or different;

[0164] X1-X2 are selected from CR in the same or different ways each time they appear x or N;

[0165] R g and R h Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted;

[0166] R g , R h , R3 and R x Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted an alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amine group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0167] In formula 4-1, the adjacent substituents R g , R h , R3 and R x Can optionally be linked to form a ring.

[0168] In this embodiment, "In Formula 4-1, the adjacent substituent R g , Rh , R3 and R x "can optionally be connected to form a ring" is intended to represent adjacent substituent groups in Formula 4-1, for example, two substituents R x Between the two substituents R g Between the two substituents R h Between two substituents R3, between adjacent substituents R h and R x Between adjacent substituents R3 and R x Between adjacent substituents R2 and R g Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0169] According to one embodiment of the present invention, the ligand L a Each occurrence is identically or differently selected from the group consisting of:

[0170]

[0171] in,

[0172] Y is selected from the group consisting of O, S, Se, SiR3R3, GeR3R3, NR3 and PR3; when two R3 are present at the same time, the two R3 may be the same or different;

[0173] U is selected from O, S, Se, CR, etc. u R u ,SiR u R u , P.R. u , or NR u ; When there are two R u When two R u Same or different;

[0174] G1-G5 are selected from CR in the same or different way each time they appear. g or N;

[0175] H1-H4 are selected from CR in the same or different manner at each occurrence h or N;

[0176] R3, R x , R g , R h , R uThe alkyl radicals are selected, at each occurrence, identically or differently, from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl radicals having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl radicals having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl radicals having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy radicals having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy radicals having 6 to 30 carbon atoms, substituted or unsubstituted substituted or unsubstituted alkenyl groups having 2 to 20 carbon atoms, substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl groups having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl groups having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl groups having 6 to 20 carbon atoms, substituted or unsubstituted amine groups, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof;

[0177] In Formula 4-2 to Formula 4-11, adjacent substituents R3, R x , R g , R h , R u Can optionally be linked to form a ring.

[0178] In this embodiment, "In Formula 4-2 to Formula 4-11, adjacent substituents R3, R x , R g , R h , R u "can be optionally connected to form a ring" is intended to mean adjacent substituent groups in Formulae 4-2 to 4-11, for example, two substituents R x Between the two substituents R g Between the two substituents R h Between the two substituents R u Between two substituents R3, between adjacent substituents R h and R x Between adjacent substituents R3 and R x Between adjacent substituents R3 and R g Between adjacent substituents R u and R g Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0179] According to one embodiment of the present invention, the ligand L a Select the structure represented by Formula 4-2 or Formula 4-7.

[0180] According to one embodiment of the present invention, wherein ring G, ring H and ring I are identically or differently selected from aromatic rings having 6 to 18 carbon atoms or heteroaromatic rings having 3 to 18 carbon atoms each time they appear.

[0181] According to one embodiment of the present invention, wherein ring G, ring H and ring I are selected from benzene ring, naphthalene ring, pyridine ring, pyrimidine ring, pyrazine ring, azanaphthyl ring, furan ring, thiophene ring, isoxazole ring, isothiazole ring, pyrrole ring, pyrazole ring, benzofuran ring, benzothiophene ring, azabenzofuran ring, or azabenzothiophene ring the same or different each time they appear.

[0182] According to one embodiment of the present invention, wherein ring G, ring H and ring I are selected from benzene ring, naphthalene ring, pyridine ring and pyrimidine ring the same or differently each time they appear; ring E is selected from pyrrole ring, indole ring and azaindole ring.

[0183] According to one embodiment of the present invention, the ligand L a Each occurrence is selected from the group consisting of:

[0184]

[0185] in,

[0186] L is selected, identically or differently, from B, N or P at each occurrence;

[0187] X1-X2 and X7-X8 are selected from N or CR at each occurrence, either identically or differently. x ;

[0188] G1-G7 are selected from CR in the same or different way each time they appear. g or N;

[0189] H1-H8 are selected from CR in the same or different manner each time they appear. h or N;

[0190] U is selected from O, S, Se, CR, etc. u R u ,SiR u R u , P.R. u or NR u ; When there are two R u When two R u Same or different;

[0191] R x , R g , R h and R uThe group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amino group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0192] Adjacent substituent R x , R g , R h and R u Can optionally be linked to form a ring.

[0193] In this embodiment, "the adjacent substituent R x , R g , R h and R u "can optionally be linked to form a ring" is intended to mean that adjacent groups of substituents, for example, two substituents R x Between the two substituents R g Between the two substituents R h Between the two substituents R u Between adjacent substituents R u and R x Between adjacent substituents R u and R g Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0194] According to one embodiment of the present invention, the ligand L a A structure selected from Formula 5-1, Formula 5-2, Formula 5-6, Formula 5-7, Formula 5-8 or Formula 5-11.

[0195] According to one embodiment of the present invention, the ligand L a A structure selected from Formula 5-1, Formula 5-2 or Formula 5-11.

[0196] According to one embodiment of the present invention, the ligand L b , L c Each time it occurs, the same or different selection is made from the group consisting of formula a to formula m:

[0197]

[0198] in,

[0199] R A , R B Each occurrence is identical or different and indicates mono-, poly-, or unsubstituted;

[0200] X B Each occurrence is identically or differently selected from the group consisting of: O, S, Se, NR N1 or CR C1 R C2 ;

[0201] W is selected, at each occurrence, identically or differently, from the group consisting of a single bond, O, S or Se;

[0202] R A , R B , R C , R D , R N1 , R C1 and R C2The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amine group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0203] Adjacent substituent R A , R B , R C , R D , R N1 , R C1 and R C2 Can optionally be linked to form a ring.

[0204] In this embodiment, "the adjacent substituent R A , R B , R C , R D , R N1 , R C1 and R C2 "can optionally be linked to form a ring" is intended to mean that adjacent groups of substituents, for example, two substituents R A Between the two substituents R B Between the two substituents R C Between, the substituent R A and R B Between, the substituent R A and R C Between, the substituent R B and R C Between, the substituent R A and R N1 Between, the substituent R B and R N1 Between, the substituent R A and RC1 Between, the substituent R A and R C2 Between, the substituent R B and R C1 Between, the substituent R B and R C2 Between, and R C1 and R C2 Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0205] According to one embodiment of the present invention, the metal complex is selected from a structure represented by Formula 6 to Formula 11:

[0206]

[0207]

[0208] in,

[0209] Z1 and X are selected from the group consisting of O, S, Se, NR2, CR2R2 and SiR2R2;

[0210] X1 to X 12 Each occurrence is the same or different selection from CR x or N;

[0211] Each occurrence of Y1-Y4 is identical or different and is selected from CR y or N;

[0212] Y is selected from SiR3R3, GeR3R3, NR3, PR3, O, S or Se; when two R3 are present at the same time, the two R3 may be the same or different;

[0213] L is selected, identically or differently, from B, N or P at each occurrence;

[0214] G1-G4 are selected from CR in the same or different manner each time they appear. g or N;

[0215] H1-H4 are selected from CR in the same or different manner at each occurrence h or N;

[0216] R”, ​​R c and R d Each occurrence, identically or differently, indicates mono-, poly- or non-substitution;

[0217] R A1 , R A2 , R B , R2, R3, R x , Ry , R”, R c , R d , R g , R h and R v The group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted an alkynyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted alkylgermanyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylgermanyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amine group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a cyano group, an isocyano group, a hydroxyl group, a mercapto group, a sulfinyl group, a sulfonyl group, a phosphino group, and combinations thereof;

[0218] Adjacent substituents in Formula 6 can be optionally linked to form a ring;

[0219] Adjacent substituents in Formula 7 can be optionally linked to form a ring;

[0220] Adjacent substituents in Formula 8 can be optionally linked to form a ring;

[0221] Adjacent substituents in Formula 9 can be optionally linked to form a ring;

[0222] Adjacent substituents in Formula 10 can be optionally linked to form a ring;

[0223] Adjacent substituents in Formula 11 may be optionally linked to form a ring.

[0224] In this embodiment, "adjacent substituents in Formula 6 can be optionally linked to form a ring" is intended to mean adjacent groups of substituents in Formula 6, for example, two substituents R x Between the two substituents R c Between the two substituents R d Between adjacent substituents R c and R d Between adjacent substituents R2 and R xAny one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0225] In this embodiment, "adjacent substituents in Formula 7 can be optionally linked to form a ring" is intended to mean adjacent substituent groups in Formula 7, for example, two substituents R x Between the two substituents R y Between two substituents R", between adjacent substituents R v Between R and R", any one or more of these substituent groups may be connected to form a ring. Obviously, these substituents may not be connected to form a ring.

[0226] In this embodiment, "adjacent substituents in Formula 8 can be optionally linked to form a ring" is intended to mean adjacent substituent groups in Formula 8, for example, two substituents R x Between the two substituents R g Between the two substituents R h Between two substituents R3, between two substituents R A1 Between the two substituents R A2 Between adjacent substituents R g Between R3, the adjacent substituents R x and R h Between adjacent substituents R x and R g Between adjacent substituents R B and R A1 Between adjacent substituents R B and R A2 Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0227] In this embodiment, "adjacent substituents in Formula 9 can be optionally linked to form a ring" is intended to mean adjacent groups of substituents in Formula 9, for example, two substituents R x Between the two substituents R g Between the two substituents R h Between the two substituents R A1 Between the two substituents R A2 Between adjacent substituents R x and R g Between adjacent substituents R B and R A1 Between adjacent substituents R B and R A2Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0228] In this embodiment, "adjacent substituents in Formula 10 can be optionally linked to form a ring" is intended to mean adjacent substituent groups in Formula 10, for example, two substituents R x Between the two substituents R g Between the two substituents R A1 Between the two substituents R A2 Between adjacent substituents R x and R g Between adjacent substituents R B and R A1 Between adjacent substituents R B and R A2 Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0229] In this embodiment, "adjacent substituents in Formula 11 can be optionally linked to form a ring" is intended to mean adjacent substituent groups in Formula 11, for example, two substituents R x Between the two substituents R h Between the two substituents R g Between two substituents R2, between two substituents R A1 Between the two substituents R A2 Between adjacent substituents R x and R g Between adjacent substituents R B and R A1 Between adjacent substituents R B and R A2 Between adjacent substituents R2 and R x Between adjacent substituents R g Between R2 and adjacent substituents R g and R x Between adjacent substituents R h and R x Any one or more of these substituent groups may be connected to form a ring. Obviously, none of these substituent groups may be connected to form a ring.

[0230] According to one embodiment of the present invention, Z1 is selected from O or S the same or differently each time it appears.

[0231] According to one embodiment of the present invention, wherein X is selected from O or S the same or differently each time it occurs.

[0232] According to one embodiment of the present invention, wherein Y is selected from O or S the same or differently each time it occurs.

[0233] According to one embodiment of the present invention, Z1 is selected from S identically or differently each time it appears.

[0234] According to one embodiment of the present invention, wherein X is O.

[0235] According to one embodiment of the present invention, wherein Y is O.

[0236] According to one embodiment of the present invention, R A1 , R A2 , R B , R2, R3, R x , R y , R”, R c , R d , R g , R h and R v Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0237] According to one embodiment of the present invention, X1-X 12 At least one of the following is selected from CR x , and the R x Selected from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1-20 carbon atoms, substituted or unsubstituted cycloalkyl having 3-20 ring carbon atoms, substituted or unsubstituted aryl having 6-30 carbon atoms, substituted or unsubstituted heteroaryl having 3-30 carbon atoms, cyano, and combinations thereof.

[0238] According to one embodiment of the present invention, X9-X 12 At least one of the following is selected from CR x , and the R xeach occurrence is selected, identically or differently, from the group consisting of: halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted -20 carbon atoms, alkynyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heteroaryl groups, substituted or unsubstituted alkylsilyl groups, substituted or unsubstituted arylsilyl groups, substituted or unsubstituted alkylgermanyl groups, substituted or unsubstituted arylgermanyl groups, substituted or unsubstituted amino groups, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof.

[0239] According to one embodiment of the present invention, X9-X 12 At least one selected from CR x , and the R x Each occurrence is identical or different and is substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, cyano, and combinations thereof.

[0240] According to one embodiment of the present invention, X9-X 12 At least one selected from CR x , and the R x It's cyano.

[0241] According to one embodiment of the present invention, X 10 Selected from CR x , and the R x It's cyano.

[0242] According to one embodiment of the present invention, X9-X 12 At least two of them are selected from CR x , and the R xeach occurrence is selected, identically or differently, from the group consisting of: halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted alkenyl having 2 to 20 carbon atoms, substituted or unsubstituted -20 carbon atoms, alkynyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heteroaryl groups, substituted or unsubstituted alkylsilyl groups, substituted or unsubstituted arylsilyl groups, substituted or unsubstituted alkylgermanyl groups, substituted or unsubstituted arylgermanyl groups, substituted or unsubstituted amino groups, acyl groups, carbonyl groups, carboxylic acid groups, ester groups, cyano groups, isocyano groups, hydroxyl groups, mercapto groups, sulfinyl groups, sulfonyl groups, phosphino groups, and combinations thereof.

[0243] According to one embodiment of the present invention, X9-X 12 At least two of them are selected from CR x , and the R x Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, cyano, and combinations thereof.

[0244] According to one embodiment of the present invention, X9-X 12 At least two of the following are selected from CR x , and one of the R x is a cyano group and at least one is a substituted or unsubstituted aryl group having 6 to 30 carbon atoms or a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms.

[0245] According to one embodiment of the present invention, X 10 Selected from CR x , and the R x is cyano; X9 is selected from CR x , and the R x It is a substituted or unsubstituted aryl group having 6 to 30 carbon atoms or a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms.

[0246] According to one embodiment of the present invention, X9-X 12 Each occurrence is selected from N or CR, either identically or differentlyx , and the R x and R x There is no connection between them to form a ring.

[0247] According to one embodiment of the present invention, X9-X 12 Each occurrence is selected from N or CR, either identically or differently x , and the R x and R x They are connected to form a 5-membered ring.

[0248] According to one embodiment of the present invention, R c At least one or at least two of the groups are selected from substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, or a combination thereof.

[0249] According to one embodiment of the present invention, R d At least one or at least two of the groups are selected from substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, or a combination thereof.

[0250] According to one embodiment of the present invention, R c At least one or at least two of them are selected from substituted or unsubstituted alkyl groups of 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, or a combination thereof; and all of the R a The sum of the number of carbon atoms is at least 4.

[0251] According to one embodiment of the present invention, R d At least one or at least two of them are selected from substituted or unsubstituted alkyl groups of 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, or a combination thereof; and all of the R a The sum of the number of carbon atoms is at least 4.

[0252] According to one embodiment of the present invention, wherein W is selected from a single bond, O or S the same or different each time it occurs.

[0253] According to one embodiment of the present invention, wherein W is selected from a single bond or O the same or differently each time it occurs.

[0254] According to one embodiment of the present invention, R x , R y , R g , R hEach occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0255] According to one embodiment of the present invention, each time X1-X8 appears, it is selected from CR x ; G1-G4 are selected from CR in the same or different manner at each occurrence g ; H1-H4 are selected from CR in the same or different manner at each occurrence h ; said R x , R g , R h Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0256] According to one embodiment of the present invention, each time X1-X8 appears, it is selected from CR x ; G1-G3 are selected from CR in the same or different manner each time they appear g ; H1-H4 are selected from CR in the same or different manner at each occurrence h ; said R x , R g and R h At least two or three of the following are selected, at each occurrence, identically or differently, from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0257] According to one embodiment of the present invention, in Formula 8 and Formula 9, G2 is CR g , and / or H3 is CR h , and / or X8 is CR x, R g , R h and R x Each occurrence is identically or differently selected from the group consisting of substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0258] According to one embodiment of the present invention, in Formula 2-1 and Formula 10, X5 to X8 are selected from CR x .

[0259] According to one embodiment of the present invention, in Formula 2-1 and Formula 10, X6 and / or X8 are selected from CR x , and R x Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms.

[0260] According to one embodiment of the present invention, in Formula 2-1, Formula 10, X5 and X7 are CH, and X6 and / or X8 are selected from CR the same or differently each time they appear. x , and R x Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms.

[0261] According to one embodiment of the present invention, in Formula 2-1 and Formula 10, G1 to G4 are selected from CR g .

[0262] According to one embodiment of the present invention, in Formula 2-1, Formula 10, G2 is CR g , and R geach occurrence is selected, identically or differently, from the group consisting of halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl having 1 to 20 carbon atoms, substituted or unsubstituted aralkyl having 7 to 30 carbon atoms, substituted or unsubstituted alkoxy having 1 to 20 carbon atoms, substituted or unsubstituted aryloxy having 6 to 30 carbon atoms, substituted or unsubstituted an alkenyl group having 2 to 20 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 3 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 20 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 20 carbon atoms, a substituted or unsubstituted amine group having 0 to 20 carbon atoms, an acyl group, a carbonyl group, a carboxylic acid group, an ester group, a nitrile group, an isonitrile group, a thiol group, a sulfinyl group, a sulfonyl group, a phosphine group, and combinations thereof.

[0263] According to one embodiment of the present invention, in Formula 2-1, Formula 10, G2 is CR g , and R g Each occurrence is identically or differently selected from substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, or substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, and G1, G3 and G4 are all CH.

[0264] According to one embodiment of the present invention, in Formula 2-2 and Formula 11, Z1 is selected from O or S.

[0265] According to one embodiment of the present invention, in Formula 2-2 and Formula 11, X1-X2, X5-X6 are selected from CR x ; G1-G4 are selected from CR in the same or different manner at each occurrence g ; H1-H4 are selected from CR in the same or different manner at each occurrence h ; R x , R g and R h Each occurrence is identically or differently selected from the group consisting of hydrogen, deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0266] According to one embodiment of the present invention, in Formula 2-2 and Formula 11, X6 is selected from CR x ; G4 is selected from CR in the same or different manner each time it appears g ; R x and R g Each occurrence is identically or differently selected from the group consisting of deuterium, halogen, substituted or unsubstituted alkyl having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl having 3 to 20 ring carbon atoms, substituted or unsubstituted heterocyclyl having 3 to 20 ring atoms, substituted or unsubstituted aryl having 6 to 30 carbon atoms, substituted or unsubstituted heteroaryl having 3 to 30 carbon atoms, substituted or unsubstituted alkylsilyl having 3 to 20 carbon atoms, substituted or unsubstituted arylsilyl having 6 to 20 carbon atoms, cyano, and combinations thereof.

[0267] According to one embodiment of the present invention, in Formula 8 to Formula 11, R A1 At least one or two of them are selected from substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1 to 20 carbon atoms, or combinations thereof.

[0268] According to one embodiment of the present invention, in Formula 8 to Formula 11, R A2 At least one or two of them are selected from substituted or unsubstituted alkyl groups having 1 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 1 to 20 carbon atoms, or combinations thereof.

[0269] According to one embodiment of the present invention, in Formula 8 to Formula 11, R A1 At least two of them are selected from substituted or unsubstituted alkyl groups having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2 to 20 carbon atoms, or combinations thereof.

[0270] According to one embodiment of the present invention, in Formula 8 to Formula 11, R A2 At least two of them are selected from substituted or unsubstituted alkyl groups having 2 to 20 carbon atoms, substituted or unsubstituted cycloalkyl groups having 3 to 20 ring carbon atoms, substituted or unsubstituted heteroalkyl groups having 2 to 20 carbon atoms, or combinations thereof.

[0271] According to one embodiment of the present invention, the first light-emitting doping material is selected from a metal complex having a structure of Formula 6 or Formula 7.

[0272] According to one embodiment of the present invention, the first light-emitting doping material is selected from the group consisting of metal complexes 1 to 38, compound 99 and compound 100 each time it appears, the specific structures of metal complexes 1 to 38, compound 99 and compound 100 are as follows:

[0273]

[0274]

[0275]

[0276]

[0277]

[0278] According to one embodiment of the present invention, the second light-emitting doping material is selected from a metal complex having a structure represented by any one of Formulae 8 to 11.

[0279] According to one embodiment of the present invention, the second light-emitting doping material is selected from the group consisting of metal complexes 39 to 98, metal complexes 101 to 132, the specific structures of metal complexes 39 to 98, metal complexes 101 to 132 are as follows:

[0280]

[0281]

[0282]

[0283]

[0284]

[0285]

[0286]

[0287] According to one embodiment of the present invention, the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer further comprise at least one host compound.

[0288] According to an embodiment of the present invention, the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer contain at least two host compounds.

[0289] According to one embodiment of the present invention, at least one of the main compounds contains at least one chemical group selected from the group consisting of: benzene, pyridine, pyrimidine, triazine, carbazole, azacarbazole, indolecarbazole, dibenzothiophene, azadibenzothiophene, dibenzofuran, azadibenzofuran, dibenzoselenophene, triphenylene, azatriphenylene, fluorene, silylate, naphthalene, quinoline, isoquinoline, quinazoline, quinoxaline, phenanthrene, azaphenanthrene, and combinations thereof.

[0290] According to an embodiment of the present invention, an electronic component is further disclosed, which includes the organic electroluminescent display panel described in any of the above embodiments.

[0291] In order to solve the color shift caused by the inconsistent brightness attenuation trends of red and green top-emitting OLED devices at different angles in organic electroluminescent display panels, the present invention studies and selects the combination of red and green light luminescent materials with the half-peak width difference of the PL spectrum within a specific range, and applies them to the red and green light devices of the display panel, ensuring that the brightness attenuation amplitudes of the red and green lights of the display panel are basically the same at different viewing angles, thereby improving the color shift problem of the panel.

[0292] As we know, for phosphorescent materials, the half-width and the shoulder peak intensity of the spectrum are important parameters of its spectrum. In order to study the influence of these parameters on the brightness decay, we conducted a series of simulation experiments.

[0293] Figure 3a A series of red light spectra with different shoulder peak intensities (S1-100, S1-80, S1-60, S1-40, S1-20) and red light spectra with different half-peak widths (S2-1, S2-3, S2-3) are shown in the figure. max ) is 622nm, and the half-peak width (FWHM) is 35nm; spectra S1-80, S1-60, S1-40, and S1-20 are obtained by compressing the shoulder peak intensity of spectrum S-100 to 80%, 60%, 40%, and 20%, respectively. The maximum emission wavelength (λ max ) are all 622nm, and the half maximum width (FWHM) is 30nm, 40nm and 49nm respectively. The spectral data of S1-100, S1-80, S1-60, S1-40, S1-20 and S2-1 to S2-3 are respectively substituted into the top emission structure shown in Figure 2, and optical simulation is performed by Setfos 5.1.1 semiconductor thin film optical simulation software developed by FLUXIM according to the method described above. Table 1 lists the brightness attenuation data obtained by simulation.

[0294] Table 1 Device brightness attenuation data corresponding to the simulated red light spectra S1-20 to S1-100 and S2-1 to S2-3

[0295]

[0296] From the data in Table 1, it can be seen that the brightness attenuation value D corresponding to each device using the S1-100 to S1-20 spectrum at a 30° viewing angle is maintained between 54.7% and 54.4%. Since the change in the spectrum from S1-100 to S1-20 is only the shoulder peak intensity, it can be seen that the change in the shoulder peak intensity of the red light spectrum has little effect on the brightness attenuation value when the half-peak width FWHM remains unchanged. Therefore, when considering the influence of the red light brightness attenuation value, only the influence of the half-peak width needs to be considered, and the influence of the shoulder peak intensity can be ignored.

[0297] The half-width of spectrum S2-1 is 30nm, which is 5nm narrower than that of S1-100 to S1-20. We can see that the corresponding brightness attenuation value D at a viewing angle of 30° is reduced to 50.7%. This shows that the narrower the half-width, the smaller the brightness attenuation D value, that is, the greater the brightness attenuation as the viewing angle changes. The half-widths of spectra S2-2 and S2-3 are 40nm and 49nm, respectively. Compared with S1-100 to S1-20, their half-widths are widened by 5nm and 14nm, respectively. We can see that the corresponding brightness attenuation values ​​D at 30° are increased to 61.6% and 65.8%, respectively. This shows that the wider the half-width, the larger the brightness attenuation D value, that is, the smaller the brightness attenuation as the viewing angle changes.

[0298] Furthermore, we also studied the effects of the shoulder peak and integrated area of ​​the green light spectrum on the device brightness attenuation.

[0299] Figure 3b A series of green light spectra with different shoulder peak intensities (S3-100, S3-80, S3-60, S3-40 and S3-20) and a series of green light spectra with different half-peak widths (S4-1, S4-2, S4-3) are shown in FIG. Among them, the maximum emission wavelength (λ max ) is 532nm, and the half-peak width (FWHM) is 35nm; spectra S3-80, S3-60, S3-40 and S3-20 are obtained by compressing the shoulder peak intensity of spectrum S3-100 to 80%, 60%, 40% and 20%, respectively, to obtain a series of spectra. Subsequently, the above-mentioned S3-100, S3-80, S3-60, S3-40 and S3-20 spectral data are respectively substituted into the top emission structure shown in Figure 2, and optical simulation is performed according to the method described above by Setfos 5.1.1. semiconductor thin film optical simulation software developed by FLUXIM. Table 2 lists the brightness attenuation data obtained by simulation.

[0300] Table 2 Device brightness attenuation data corresponding to the simulated green light spectra S3-20 to S3-100 and S4-1 to S4-3

[0301]

[0302] From the data in Table 2, it can be seen that the corresponding brightness attenuation value D at a 30° viewing angle remains between 70.8% and 71.0%, that is, when the half-peak width FWHM remains unchanged, the change in the shoulder peak intensity and integrated area of ​​the green light spectrum has basically no effect on the brightness attenuation value. Spectra S4-1 to S4-3, the corresponding spectral half-peak widths are 30nm, 40nm and 49nm respectively. Like red light, the wider the half-peak width, the greater the brightness attenuation D value, that is, the smaller the brightness attenuation with the change of viewing angle. Therefore, similar to red light, when considering the influence of the green light brightness attenuation value, only the influence of the half-peak width needs to be considered, and the influence of the shoulder peak intensity can be ignored.

[0303] According to the above simulation data, the half-width of the luminescent material has an extremely important influence on the brightness attenuation of the device. The wider the half-width, the smaller the brightness attenuation as the viewing angle changes. Considering the viewing angle, this is exactly what researchers in the display field expect. However, for two materials with the same EQE, when the material with a wider half-width is prepared into a top-emitting device, due to the microcavity effect, the improvement of its device efficiency relative to the bottom-emitting device is more limited, that is, the wider the half-width, the lower the efficiency of the material in the top-emitting device. Therefore, considering the device efficiency, materials with narrow half-width are expected by researchers in this field. If you need to take into account both efficiency and viewing angle, in addition to considering the spectrum of a single material itself, you also need to consider the matching between different colors (that is, different luminescent materials).

[0304] On this basis, we further studied the attenuation of light in different bands at different viewing angles. Specifically:

[0305] First, the red light spectrum S1-100 (half-peak width of 35 nm) is red-shifted or blue-shifted to different degrees to obtain a series of red, green, and blue light spectra (S5 to S10, as shown in Table 3). Figure 4a Then, similarly, this series of spectral data is substituted into the top emission structure shown in FIG2 , and optical simulation is performed by using Setfos 5.1.1 semiconductor thin film optical simulation software developed by FLUXIM according to the method described above. Figure 4b The brightness attenuation data of the spectrum S5 to S10 at different viewing angles (in the range of 0° to 60°) obtained by simulation are shown in Table 3. The brightness change and brightness attenuation data at different viewing angles (in the range of 0° to 30°) obtained by simulation are listed in Table 3.

[0306] Table 3 Brightness attenuation data of the device corresponding to the simulated spectra S5 to S10 at a viewing angle of 0° to 30°

[0307]

[0308] Since 30° is the most common angle people use when using display devices, we use the brightness attenuation corresponding to a viewing angle of 30° as an indicator for our research. Figure 4b As can be seen from the data in Table 3, within the viewing angle range of 0° to 60°, the brightness of spectra S5 to S10 with the same half-width at 0°, 45°, and 60° does not change much at viewing angles, and the largest changes are at 15° and 30°. At a viewing angle of 30°, when the maximum emission wavelength is 460nm, its brightness attenuation D is 67.6%; when the maximum emission wavelength is red-shifted to 520nm, its brightness attenuation D is 65.1%; when the maximum emission wavelength is red-shifted to 622nm, its brightness attenuation D is 54.7%. In other words, when the luminous spectrum waveform is the same, the brightness attenuation of the spectrum in the red light band is more serious than that of the green light, and the attenuation in the green and red light bands is more serious than that of the blue light.

[0309] It is generally believed in the industry that if the brightness attenuation D values ​​of different colors in the display panel differ by 15%, the uniformity of brightness attenuation can be basically maintained, and the color deviation is small. Therefore, the difference in the half-peak width between red and green light is allowed to fluctuate within a certain range. On this basis, the present invention innovatively proposes a new type of display panel, which controls the PL emission spectra of red and green light within certain conditions (the half-peak width is within a specific range, and the half-peak width difference meets a specific range, and the half-peak width difference between red and green light is preferably ≥-15nm), so that the red light attenuates more and the green light also attenuates by the same magnitude, thereby reducing the change of white balance under different viewing angles. In particular, due to the selection of narrow peak width luminescent materials, the efficiency and color purity of the device can also be guaranteed.

[0310] We conducted a series of simulations and device measurements, and provided corresponding data to demonstrate the technical effects of the present invention.

[0311] Simulation Example:

[0312] Simulation Example 1:

[0313] (1) Green pixel device simulation: Substitute the green light spectrum S-520-30 into the top emission structure shown in FIG2 , and perform optical simulation using the Setfos 5.1.1 semiconductor thin film optical simulation software developed by FLUXIM according to the method described above;

[0314] (2) Red pixel device simulation: The red light spectrum S-622-40 was substituted into the top emission structure shown in FIG2 , and optical simulation was performed using the Setfos 5.1.1 semiconductor thin film optical simulation software developed by FLUXIM according to the method described above.

[0315] Simulation Example 2:

[0316] The method is the same as that of simulation embodiment 1, except that the green light spectrum S-520-35 is substituted in the green pixel device simulation, and the red light spectrum S-622-30 is substituted in the red pixel device simulation.

[0317] Simulation Example 3:

[0318] The method is the same as that of simulation embodiment 1, except that the green light spectrum S-520-35 is substituted in the green pixel device simulation, and the red light spectrum S-622-40 is substituted in the red pixel device simulation.

[0319] Simulation Example 4:

[0320] The method is the same as that of simulation embodiment 1, except that the green light spectrum S-520-40 is substituted in the green pixel device simulation, and the red light spectrum S-622-40 is substituted in the red pixel device simulation.

[0321] The curve diagrams of the green light and red light spectra used in the simulation examples 1-4 are shown in Figures 5a-5b. The maximum emission wavelengths λ1 and λ2 [nm] corresponding to the green light and red light, respectively, the half-peak width FWHM1 and FWHM2 data, and the half-peak width difference between the red light and green light spectra (ΔFWHM, ΔFWHM=FWHM2-FWHM1) are recorded and displayed in Table 4.

[0322] Table 4 Spectral parameters of red and green light used in simulation examples 1-4

[0323]

[0324]

[0325] Substituting the above spectrum into the simulation, the brightness (L0) corresponding to the red and green pixel devices at a 0° viewing angle, the brightness (L30) corresponding to the 30° viewing angle, and the brightness attenuation value (D1, D1=L30 / L0) corresponding to each device at a 30° viewing angle are obtained, and the brightness attenuation difference (ΔD, ΔD=D1-D2) of the green and red pixel devices is calculated. The above data are all shown in Table 5.

[0326] Table 5: Brightness and brightness attenuation data of red and green pixel devices in simulation examples 1 to 4

[0327]

[0328] The data from the above simulation examples have shown that by reasonably selecting red and green light materials with a specific relationship in half-width (FWHM red light - FWHM green light ≥ -15nm) in the display panel, the brightness attenuation of the red and green devices can be made consistent to a certain extent, meeting the industry's demand for color deviation (D value difference within 15%).

[0329] In addition, we further provide a series of measured device data to specifically illustrate the working principle of the novel organic light-emitting display panel of the present invention. Obviously, the following embodiments are only for illustrative purposes and are not intended to limit the scope of the present invention. Based on the following embodiments, those skilled in the art can obtain other embodiments of the present invention by improving them.

[0330] In the device embodiment, the characteristics of the device are also tested using conventional equipment in the field (including but not limited to the vapor deposition machine produced by Angstrom Engineering, the optical test system and life test system produced by Suzhou Fushida, the ellipsometer produced by Beijing Liangtuo, etc.) by methods well known to those skilled in the art. Since those skilled in the art are all aware of the use of the above-mentioned equipment, test methods and other related contents, and can obtain the inherent data of the sample with certainty and without influence, the above-mentioned related contents will not be elaborated in this patent.

[0331] Device Embodiment

[0332] Each of the following device embodiments and comparative examples includes a red pixel device and a green pixel device.

[0333] Device Example 1

[0334] Preparation of green pixel device: First, a 0.7 mm thick glass substrate with pre-patterned indium tin oxide (ITO) was used. / Ag / ITO As the anode, the substrate was dried in a glove box to remove moisture and loaded onto a holder and transferred into the vacuum chamber. The organic layer specified below was heated to a vacuum of approximately 10 -6 Torr's case The anode layer was deposited sequentially by vacuum thermal evaporation at a rate of: first, compound HT and compound HI were simultaneously deposited as a hole injection layer (HIL, 97:3 ), the evaporated compound HT is used as a hole transport layer (HTL, ). Next, compound EB-1 was evaporated to serve as an electron blocking layer (EBL, ∼50). Subsequently, compounds GH-1, GH-2, and compound 99 were evaporated on the EBL to serve as an emission layer (EML, 48:48:4, ), evaporated compound HB as a hole blocking layer (HBL, ), compound ET and Liq were co-deposited as electron transport layer (ETL, 40:60, ). After that, evaporation Thickness of metal ytterbium (Yb) as the electron injection layer (EIL), while the metal magnesium (Mg) and metal silver (Ag) are evaporated as the cathode (Cathode, 10:90, ), followed by evaporation of compound CPL-1 as a cover layer (CPL, ). The device was then transferred back to the glove box and encapsulated with a glass cover slip to complete the device.

[0335] Preparation of red pixel device: The preparation method is the same as that of the green pixel device, except that the evaporated compound HT is used as the hole transport layer (HTL, ); the evaporated compound EB-2 is used as an electron blocking layer (EBL, ). Subsequently, compound RH-1 and compound 101 were evaporated on the EBL as the light-emitting layer (EML, 97:3, ).

[0336] Device Example 2

[0337] The preparation method of the green pixel device in Example 2 is the same as the preparation method of the green pixel device in Example 1;

[0338] The implementation of the red pixel device in Example 2 is the same as that in Example 1, except that the light-emitting layer of the red device is formed by co-deposition of compound RH-1 and compound 102 (EML, 97:3, ).

[0339] Device Example 3

[0340] The preparation method of the green pixel device in Example 3 is the same as the preparation method of the green pixel device in Example 1;

[0341] The preparation method of the red pixel device in Example 3 is the same as that of the red pixel device in Example 1, except that the light-emitting layer of the red device is formed by co-deposition of compound RH-1 and compound 103 (EML, 97:3, ).

[0342] Device Example 4

[0343] The preparation method of the green pixel device in Example 4 is the same as the preparation method of the green pixel device in Example 1;

[0344] The preparation method of the red pixel device in Example 4 is the same as that of the red pixel device in Example 1, except that the light-emitting layer of the red device is formed by co-deposition of compound RH-1 and compound 104 (EML, 97:3, ).

[0345] Device Example 5

[0346] The preparation method of the green pixel device in Example 5 is the same as that of the green pixel device in Example 1, except that the light-emitting layer in the green device is formed by co-deposition of compound GH-1, GH-2 and compound 100 (EML, 48:48:4, );

[0347] The preparation method of the red pixel device in Example 5 is the same as the preparation method of the red pixel device in Example 1.

[0348] Device Example 6

[0349] The preparation method of the green pixel device in Example 6 is the same as the preparation method of the green pixel device in Example 5;

[0350] The preparation method of the red pixel device in Example 6 is the same as that of the red pixel device in Example 5, except that the light-emitting layer of the red device is formed by co-deposition of compound RH-1 and compound 102 (EML, 97:3, ).

[0351] Device Example 7

[0352] The preparation method of the green pixel device in Example 7 is the same as the preparation method of the green pixel device in Example 5;

[0353] The preparation method of the red pixel device in Example 7 is the same as that of the red pixel device in Example 5, except that the light-emitting layer of the red device is formed by co-deposition of compound RH-1 and compound 103 (EML, 97:3, ).

[0354] Device Example 8

[0355] The preparation method of the green pixel device in Example 8 is the same as the preparation method of the green pixel device in Example 5;

[0356] The preparation method of the red pixel device in Example 8 is the same as that of the red pixel device in Example 5, except that the light-emitting layer of the red device is formed by co-deposition of compound RH-1 and compound 104 (EML, 97:3, ).

[0357] Device Comparison Example 1

[0358] The preparation method of the green pixel device in Comparative Example 1 is the same as that of the green pixel device in Example 1, except that the light-emitting layer in the green device is formed by co-deposition of compounds GH-1, GH-2 and compound GD (EML, 45:45:10, );

[0359] The preparation method of the red pixel device in Comparative Example 1 is the same as the preparation method of the red pixel device in Example 1.

[0360] Device Comparison Example 2

[0361] The preparation method of the green pixel device in Comparative Example 2 is the same as the preparation method of the green pixel device in Comparative Example 1;

[0362] The preparation method of the red pixel device in Comparative Example 2 is the same as that of the red pixel device in Comparative Example 1, except that the light-emitting layer of the red device is formed by co-deposition of compound RH-1 and compound 102 (EML, 97:3, ).

[0363] Device Comparison Example 3

[0364] The preparation method of the green pixel device in Comparative Example 3 is the same as that of the green pixel device in Comparative Example 1; the preparation method of the red pixel device in Comparative Example 3 is the same as that of the red pixel device in Comparative Example 1, except that the light-emitting layer of the red device is formed by co-deposition of compound RH-1 and compound 104 (EML, 97:3, ).

[0365] The detailed structure and thickness of the light-emitting layer of the device are shown in Table 6. The compounds of the co-evaporated layer are shown in their recorded weight ratios.

[0366] Table 6 Light-emitting layer structures of green pixel devices and red pixel devices in Examples 1 to 8 and Comparative Examples 1 to 3

[0367]

[0368]

[0369] The material structure used in the device is shown below:

[0370]

[0371]

[0372]

[0373] The compound CPL-1 is a cover layer material purchased from Jiangsu Sanyue Technology Co., Ltd. (refractive index n@630nm is 1.95).

[0374] Table 7 records the maximum emission wavelength λ1, λ2 [nm], half-peak width FWHM1, FWHM2 [nm] data of the PL spectra of the green and red light emitting materials used in device embodiments 1 to 8 and device comparison examples 1 to 3, and the half-peak width difference of the PL spectra of the red and green light emitting materials (ΔFWHM, ΔFWHM=FWHM2-FWHM1).

[0375] Table 7 PL spectral data of red and green luminescent materials used in device embodiments 1 to 8 and device comparative examples 1 to 3

[0376]

[0377] Table 8 records the corresponding brightness (L0) of the green pixel devices and the red pixel devices in device embodiments 1 to 8 and device comparison examples 1 to 3 at a viewing angle of 0°, the corresponding brightness (L30) at a viewing angle of 30°, and the corresponding brightness attenuation value of each device at a viewing angle of 30° (D1, D1=L30 / L0; that is, the ratio of the brightness at 30° obtained by measuring the actual device to the brightness of the device at 0°), and calculates the brightness attenuation difference (ΔD, ΔD=D1-D2) of the green and red pixel devices.

[0378] Table 8 Brightness and brightness attenuation data of red and green pixel devices in device embodiments 1 to 8 and device comparison examples 1 to 3

[0379]

[0380]

[0381] It is generally believed in the industry that when the brightness attenuation D values ​​of different color devices in the display panel differ by 15%, the brightness attenuation can basically be kept uniform, and the color deviation is small. It can be seen from the data in Tables 7 and 8 that the preparation methods of the green pixel devices in the device embodiments 1-4 of the present invention are the same, and the doping materials of the light-emitting layers all use the green light-emitting doping material compound 99, whose PL spectrum has a maximum emission wavelength of 528nm and a half-peak width FWHM1 of 31nm, and the corresponding green pixel device brightness attenuation value D1 is 59%. The only difference between embodiments 1-4 is that the light-emitting layer of the red pixel device uses a red light-emitting doping material whose half-peak width difference with the green light doping material is within a specific range. Specifically:

[0382] In Example 1, the red light-emitting doping material used is compound 101, whose PL spectrum has a maximum emission wavelength of 619nm and a half-width FWHM2 of 30nm. The half-width difference ΔFWHM with the green light material compound 99 is 30nm-31nm-1nm, that is, the half-widths of the two are relatively close. At this time, at a viewing angle of 30°, the brightness attenuation value D2 corresponding to the red device in Example 1 is 55%, and the brightness attenuation value D1 corresponding to the green pixel device is 59%. The brightness attenuation difference ΔD is 59%-55%-4%, that is, the brightness attenuation values ​​of red and green light are relatively close.

[0383] Similarly, in Example 2, the red light-emitting doping material used is compound 102, whose PL spectrum has a maximum emission wavelength of 619 nm and a half-width FWHM2 of 31 nm, which has a half-width difference ΔFWHM=31nm-31nm=0nm with compound 99, i.e., the half-width is the same. At this time, the brightness attenuation value D2 corresponding to the red device in Example 2 is 58%, and the brightness attenuation difference ΔD between the green pixel device is 1%, i.e., the brightness attenuation values ​​of red and green light are almost completely consistent. Similarly, in Example 3, the red light-emitting doping material used is compound 103, whose PL spectrum has a maximum emission wavelength of 619 nm and a half-width FWHM2 of 40 nm. The half-width difference ΔFWHM with compound 99 is 40 nm-31 nm=9 nm, i.e., the green half-width is 9 nm narrower than the red half-width. At this time, the brightness attenuation value D2 corresponding to the red device in Example 3 is 72%, and the brightness attenuation difference ΔD with the green pixel device is -13%, i.e., the brightness attenuation values ​​of red and green light are relatively close. In Example 4, the red light-emitting doping material used is compound 104, whose PL spectrum has a maximum emission wavelength of 624 nm and a half-width FWHM2 of 31 nm. The half-width difference ΔFWHM with compound 99 is 31 nm-31 nm=0 nm, that is, the green half-width is consistent with the red. At this time, the brightness attenuation value D2 corresponding to the red device in Example 4 is 54%, and the brightness attenuation difference ΔD with the green pixel device is -5%, that is, the brightness attenuation values ​​of red and green light are relatively close.

[0384] It can be seen from the above data that in device embodiments 1-4 of the present invention, the brightness of the red and green pixel devices are attenuated but the attenuation amplitudes are basically the same. When applied to a display panel, the picture presented at a large angle will not become green or red due to the stronger attenuation of one of the two, thereby ensuring the performance of high-quality colors at different viewing angles.

[0385] In addition, it should be specially noted that in Examples 1-4, for the green light device, its brightness decays from 20318 nits at a viewing angle of 0° to 11910 nits at 30°. Although its D1 is relatively large, because its brightness at a viewing angle of 0° is relatively high, even after attenuation, its brightness can still reach more than 10000 nits, showing relatively strong light; for the red light device, the brightness of the red light device in Examples 1-4 at a viewing angle of 30° is 3108 nits, 4240 nits, 4822 nits and 3952 nits respectively, and the brightness after attenuation also reaches more than 3000 nits, which can still show relatively strong light and can fully meet the human eye's demand for panel brightness during use. Therefore, the user experience will not be deteriorated due to brightness attenuation at different viewing angles.

[0386] In the red and green light devices of device embodiments 5-8, we also selected red and green light luminescent materials whose half-width difference satisfies a specific relationship (FWHM2-FWHM1≥-15nm). It can be seen from the data in Table 8 that the brightness attenuation amplitudes of the red and green lights in embodiments 5-8 are relatively close (the absolute values ​​of ΔD are all less than or equal to 9%). Therefore, a relatively high-quality color picture can be presented at different viewing angles.

[0387] It is worth noting that the green light-emitting doping material compound GD used in Comparative Examples 1 to 3 is a material used in current commercial applications, and its PL spectrum has a maximum emission wavelength of 525nm, and a relatively wide half-width FWHM1 of 52nm. The corresponding brightness attenuation value D1 of the green light device is 86%, that is, the attenuation is relatively weak. In Comparative Examples 1 to 3, the compound GD with a wider half-width is used in combination with the red light-emitting materials compound 101, compound 102 and compound 104 with a narrower half-width. The half-width differences are -22nm, -21nm and -21nm, respectively, and the brightness attenuation differences are 31%, 28% and 32%, respectively, that is, the brightness attenuation of red and green light is quite different, and the attenuation of the two is inconsistent. In this case, if observed at a 30° viewing angle, the picture presented in the display panel will be more greenish and the color will be distorted because the green light attenuation is weaker and the red light attenuation is stronger, giving the user a bad experience.

[0388] The above data show that the device embodiments 1 to 8 using a combination of red and green light emitting materials with FWHM2 (red light emitting doping material) -FWHM1 (green light emitting doping material) ≥ -15nm have a small difference in the brightness attenuation amplitude of the red and green pixel devices, and can effectively improve the color shift problem that may occur at different viewing angles in the display panel containing red and green pixel devices, and have broad application prospects.

[0389] In summary, the present invention selects red and green light luminescent materials with a half-peak width difference of the PL spectrum within a specific range (FWHM2-FWHM1≥-15nm) for combination and application in devices of different color pixels of the display panel, thereby ensuring that the brightness attenuation amplitudes of red and green light are basically the same at different viewing angles, so that the picture presented in the display panel will not become more green or red due to the stronger attenuation of one of them, thereby presenting a picture with relatively high-quality colors at different viewing angles.

[0390] Of course, there are generally at least three sub-pixels of red, green and blue in the display panel, and the color shift under a wide viewing angle is directly related to the brightness attenuation of the three sub-pixels. At present, the half-peak width of commercial blue light is generally below 35nm, so there is also a problem of brightness attenuation under a wide viewing angle. In order to ensure the stability of white balance under a wide viewing angle, the brightness attenuation of the three sub-pixels of red, green and blue under a wide viewing angle should be as consistent as possible. Therefore, the spectral relationship between the red and green pixels explored above is also applicable to blue light pixels, that is, FWHM1 (green light emitting doping material)-FWHM3 (blue light emitting doping material) ≥-15nm, preferably, 15nm ≥ FWHM1-FWHM3 ≥-15nm, more preferably 3nm ≥ FWHM1-FWHM3 ≥-3nm, and more preferably, FWHM1-FWHM3 ≥ 0nm. In addition, since red and green pixels are constantly developing in the direction of narrow spectrum, according to the above simulation, it can be seen that when the brightness attenuation amplitude is the same, the bluer the sub-pixel requires the narrower the half-peak width of the spectrum. Therefore, if the half-width of the red and green sub-pixels is narrowed to 30nm, the blue sub-pixel needs to be below 30nm, that is, FWHM3≤30nm, preferably, FWHM3≤28nm, and more preferably, FWHM3≤25nm.

[0391] In summary, according to the contents disclosed in the present invention, by selecting a combination of luminescent materials of different colors with a half-width difference within a specific range and applying them to pixels of different colors in a display panel, the brightness decay amplitude can be made basically consistent. While ensuring the efficiency and color purity of OLEDs, the performance of different pixels in the display panel at a wide viewing angle can be coordinated, and the color cast problem can be further improved, which has broad application prospects.

[0392] It should be understood that the various embodiments described herein are only examples and are not intended to limit the scope of the present 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 may be replaced with other materials and structures without departing from the spirit of the present invention. It should be understood that the various theories about why the present invention works are not intended to be restrictive.

Claims

1. An organic electroluminescent display panel, comprising a base substrate, on which at least two organic electroluminescent devices are arranged; in, The first organic electroluminescent device comprises: a first anode, a first cathode and a first light-emitting layer arranged between the first anode and the first cathode; the first light-emitting layer comprises a first light-emitting doping material, and the maximum emission wavelength of the photoluminescence spectrum thereof is λ1, and the corresponding half-peak width is FWHM1; The second organic electroluminescent device comprises: a second anode, a second cathode and a second light-emitting layer arranged between the second anode and the second cathode; the second light-emitting layer comprises a second light-emitting doping material, and the maximum emission wavelength of the photoluminescence spectrum thereof is λ2, and the corresponding half-peak width is FWHM2; The characteristics are: 500nm≤λ1<600nm;λ2≥600nm; FWHM1 and FWHM2 are both less than or equal to 40nm; and FWHM2-FWHM1≥-15nm.

2. The organic electroluminescent display panel according to claim 1, wherein: 15nm≥FWHM2-FWHM1≥-15nm; Preferably, 8nm≥FWHM2-FWHM1≥-8nm; More preferably, 5nm≥FWHM2-FWHM1≥-5nm; Most preferably, 3nm≥FWHM2-FWHM1≥-3nm.

3. The organic electroluminescent display panel according to claim 1, wherein: FWHM2-FWHM1≥0.

4. The organic electroluminescent display panel according to any one of claims 1 to 3, wherein: At least one of FWHM1 and FWHM2 is less than or equal to 35nm; Preferably, at least one of FWHM1 and FWHM2 is less than or equal to 30 nm; More preferably, 20 nm ≤ FWHM1 ≤ 30 nm, and 20 nm ≤ FWHM2 ≤ 30 nm.

5. The organic electroluminescent display panel according to any one of claims 1 to 3, wherein: 500nm≤λ1<560nm; preferably, 500nm≤λ1<535nm; more preferably, 515nm≤λ1<535nm.

6. The organic electroluminescent display panel according to any one of claims 1 to 3, wherein: 600nm≤λ2<650nm; preferably, 610nm≤λ2<640nm; more preferably, 615nm≤λ2<640nm.

7. The organic electroluminescent display panel according to any one of claims 1 to 3, wherein: The first organic electroluminescent device and the second organic electroluminescent device are both top-emitting devices.

8. The organic electroluminescent display panel according to claim 1 or 7, wherein: The first organic electroluminescent device comprises a first capping layer, and the second organic electroluminescent device comprises a second capping layer. Preferably, the first capping layer and the second capping layer are made of the same material and / or have the same thickness.

9. The organic electroluminescent display panel according to claim 1 or 7, wherein: The first cathode and the second cathode have the same thickness and / or material; preferably, the first cathode and the second cathode are the same electrode.

10. The organic electroluminescent display panel according to claim 1 or 7, wherein: The first cathode and the second cathode include Yb, Mg, Ag, MoOx, Yb, Ca, ITO, IZO, or a combination thereof; Preferably, the first cathode and the second cathode comprise a composition of Mg and Ag, and the mass ratio of Mg to Ag in the composition is 0.5:9.5-2:

8.

11. The organic electroluminescent display panel according to claim 1 or 7, wherein: The first anode and the second anode are selected from Ag, Al, Ti, Cr, Pt, Ni, TiN, ITO, MoOx, and combinations thereof; Preferably, the reflectivity of the anode is greater than 50%; More preferably, the reflectivity of the anode is greater than 70%.

12. The organic electroluminescent display panel according to any one of claims 1 to 11, wherein: The first light-emitting doping material and / or the second light-emitting doping material is a phosphorescent light-emitting doping material.

13. The organic electroluminescent display panel according to claim 12, wherein: The phosphorescent doping material is a metal complex.

14. The organic electroluminescent display panel according to claim 1, wherein: The substrate also includes a third organic electroluminescent device, wherein the third organic electroluminescent device includes a third light-emitting layer; the third light-emitting layer includes a third light-emitting doping material, and the maximum emission wavelength of the photoluminescence spectrum of the third light-emitting doping material is λ3 and the half-peak width is FWHM3; wherein FWHM3<35nm; 400≤λ3<500nm; FWHM1–FWHM3≥-15nm; Preferably, 15nm≥FWHM1-FWHM3≥-15nm; More preferably, 3nm≥FWHM1-FWHM3≥-3nm Most preferably, FWHM1 - FWHM3 ≥ 0 nm.

15. The organic electroluminescent display panel according to claim 14, wherein: FWHM3≤30nm; preferably, FWHM3≤28nm; more preferably, FWHM3≤25nm.

16. The organic electroluminescent display panel according to claim 14, wherein: The third light-emitting layer may further include a fourth light-emitting doping material, and at least one of the fourth light-emitting doping material and the third light-emitting doping material is selected from phosphorescent light-emitting doping materials.

17. The organic electroluminescent display panel according to claim 1, wherein: The substrate is selected from glass, polyimide or silicon.

18. The organic electroluminescent display panel according to any one of claims 1 to 17, wherein: The brightness attenuation value of the first organic electroluminescent device at a viewing angle of 30° is D1, and the brightness attenuation value of the second organic electroluminescent device at a viewing angle of 30° is D2; Among them, -15%≤D1-D2≤15%; preferably, -10%≤D1-D2≤10%.

19. An electronic component comprising the organic electroluminescent display panel according to any one of claims 1 to 18.

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