Organic light emitting device, and display apparatus, image pickup apparatus, illumination apparatus, and moving object

Abstract

The present disclosure provides an organic light-emitting device including an anode, a first light-emitting layer, a second light-emitting layer, and a cathode in this order, the first light-emitting layer and the second light-emitting layer being in contact with each other, the first light-emitting layer comprising a first organic compound and a first metal complex, the second light-emitting layer comprising a second organic compound and a second metal complex, the second light-emitting layer contains a second organic compound, a third organic compound, and a second metal complex, the third organic compound being not a metal complex, and the following relationships (a) to (c) being satisfied. (a) HOMO (D1) gt; hOMO (H1) (b) LUMO (H2) gt; lUMO (H3) (c) HOMO (D1)-HOMO (H1) gt; lUMO (H2)-LUMO (H3)

Description

Technical Field

[0001] The present invention relates to an organic light emitting device, and a display device, an electronic device, an imaging device, a lighting device, and a mobile object including the organic light emitting device. Background Art

[0002] An organic electroluminescent device (hereinafter also referred to as an “organic EL device” or an “organic light-emitting device”) is a device that emits light by passing electricity through an organic compound layer including an anode, a cathode, and a light-emitting layer disposed between these electrodes.

[0003] In recent years, the research and development of full-color displays including organic light-emitting devices has been vigorously promoted. Known organic light-emitting devices are roughly divided into fluorescent light-emitting devices and phosphorescent light-emitting devices according to the type of compounds contained in the light-emitting layer, and a device design suitable for each type is required. Here, the phosphorescent light-emitting device includes a metal complex, such as represented by an Ir complex. In the metal complex, some compounds have an excited state associated with a transition from the d orbital of a metal atom to a ligand (metal to ligand charge transfer (MLCT) transition). The highest occupied molecular orbital (HOMO) energy level derived from the d orbital of the metal atom is formed, and therefore these compounds tend to have a high HOMO energy level.

[0004] Patent document 1 discloses an organic light-emitting device in which two light-emitting layers each consisting of a host material and a light-emitting material are stacked. Patent document 2 discloses an organic light-emitting device having a light-emitting layer consisting of a host material, a light-emitting material, and a metal complex as an electron-capturing material. Patent document 3 discloses an organic light-emitting device in which two light-emitting layers each consisting of a host material and a light-emitting material are stacked.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Laid-Open No. 2018-182345

[0008] Patent Document 2: Japanese Patent Laid-Open No. 2011-171269

[0009] Patent Document 3: Japanese Patent Application No. 2008-509565 Summary of the invention

[0010] Problem that the invention aims to solve

[0011] However, in each of the organic light-emitting devices described in Patent Documents 1 to 3, the light-emitting layer is not structured in consideration of the fact that the light-emitting layer having a metal complex described therein is a hole-trapping light-emitting layer, and thus the organic light-emitting device has a local recombination region in the light-emitting layer. In such an organic light-emitting device, adjustment of carrier balance is insufficient, and thus the durability of the organic light-emitting device has room for improvement.

[0012] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an organic light-emitting device having excellent durability.

[0013] Solutions for solving problems

[0014] The organic light-emitting device according to the present invention comprises an anode, a first light-emitting layer, a second light-emitting layer and a cathode in sequence, wherein the first light-emitting layer and the second light-emitting layer are in contact with each other, the first light-emitting layer comprises a first organic compound and a first metal complex, the second light-emitting layer comprises a second organic compound, a third organic compound and a second metal complex, the third organic compound is not a metal complex, and the following relationships (a) to (c) are established:

[0015] (a) HOMO(D1)>HOMO(H1)

[0016] (b)LUMO(H2)>LUMO(H3)

[0017] (c)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3).

[0018] HOMO(D1), HOMO(H1), LUMO(H2) and LUMO(H3) respectively represent the HOMO energy level of the first metal complex, the HOMO energy level of the first organic compound, the LUMO energy level of the second organic compound and the LUMO energy level of the third organic compound.

[0019] Effects of the Invention

[0020] According to the present invention, an organic light emitting device having excellent durability can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] [ Figure 1 ] shows a schematic cross-sectional view of an example of an organic light-emitting device according to an embodiment of the present invention.

[0022] [ Figure 2 ] schematically shows an energy diagram of energy levels around a light-emitting layer included in an organic light-emitting device according to an embodiment of the present invention.

[0023] [ Figure 3A] A schematic cross-sectional view of an example of a pixel of a display device according to an embodiment of the present invention.

[0024] [ Figure 3B ] A schematic cross-sectional view of an example of a display device using an organic light-emitting device according to an embodiment of the present invention.

[0025] [ Figure 4 ] A schematic cross-sectional view of an example of a display device using an organic light-emitting device according to an embodiment of the present invention.

[0026] [ Figure 5A ]A schematic diagram of an example of an imaging device according to an embodiment of the present invention.

[0027] [ Figure 5B ]A schematic diagram of an example of an electronic device according to an embodiment of the present invention.

[0028] [ Fig. 6A ]A schematic diagram of an example of a display device according to an embodiment of the present invention.

[0029] [ Figure 6B ]Schematic diagram of an example of a foldable display device.

[0030] [ Fig. 7A ] is a schematic diagram showing an example of a lighting device according to an embodiment of the present invention.

[0031] [ Figure 7B ] A schematic diagram of an example of an automobile having a vehicle lamp according to an embodiment of the present invention.

[0032] [ Fig. 8A ] Schematic diagram of an example of a wearable device according to an embodiment of the present invention.

[0033] [ Figure 8B ] Schematic diagram of an example of a wearable device according to an embodiment of the present invention, the wearable device including a camera device.

[0034] [ Fig. 9A ]A schematic diagram of an example of an image forming apparatus according to an embodiment of the present invention.

[0035] [ Fig. 9B ]A schematic diagram of an example of an exposure light source for an image forming apparatus according to an embodiment of the present invention.

[0036] [ Fig. 9C ]A schematic diagram of an example of an exposure light source for an image forming apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In the present specification, examples of the halogen atom include, but are not limited to, fluorine, chlorine, bromine, and iodine. Among these, a fluorine atom is preferred.

[0038] The alkyl group may be an alkyl group having a carbon number of 1 to 20. Examples thereof include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, sec-butyl, octyl, cyclohexyl, 1-adamantyl, and 2-adamantyl.

[0039] The alkoxy group may be an alkoxy group having a carbon number of 1 to 10. Examples thereof include, but are not limited to, a methoxy group, an ethoxy group, a propoxy group, a 2-ethyl-octyloxy group, and a benzyloxy group.

[0040] The aryl group may be an aryl group having a carbon number of 6 to 20. Examples thereof include, but are not limited to, a phenyl group, a naphthyl group, an indenyl group, a biphenyl group, a terphenyl group, a fluorenyl group, a phenanthrenyl group, a fluoranthenyl group, and a triphenylenyl group.

[0041] The heterocyclic group may be a heterocyclic group having 3 to 20 carbon atoms. Examples thereof include, but are not limited to, pyridyl, pyrimidyl, pyrazinyl, triazolyl, oxazolyl, oxadiazolyl, thiazolyl, thiadiazolyl, carbazolyl, acridinyl, phenanthrolinyl, dibenzofuranyl, and dibenzothiophenyl.

[0042] Examples of the amino group include, but are not limited to, N-methylamino, N-ethylamino, N,N-dimethylamino, N,N-diethylamino, N-methyl-N-ethylamino, N-benzylamino, N-methyl-N-benzylamino, N,N-dibenzylamino, anilino, N,N-diphenylamino, N,N-dinaphthylamino, N,N-difluorenylamino, N-phenyl-N-tolylamino, N,N-ditolylamino, N-methyl-N-phenylamino, N,N-dianisolylamino, N-mesityl-N-phenylamino, N,N-dimesitylamino, N-phenyl-N-(4-tert-butylphenyl)amino, N-phenyl-N-(4-trifluoromethylphenyl)amino, N-piperidinyl, and carbazolyl.

[0043] Examples of aryloxy groups include, but are not limited to, phenoxy groups.

[0044] Examples of the silyl group include, but are not limited to, a trimethylsilyl group and a triphenylsilyl group.

[0045] Examples of substituents that may be further included in the alkyl, alkoxy, aryl, heterocyclic, amino, aryloxy and silyl groups include, but are not limited to: deuterium atoms; halogen atoms such as fluorine, chlorine, bromine and iodine; alkyl groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl and tert-butyl; alkoxy groups such as methoxy, ethoxy and propoxy; amino groups such as dimethylamino, diethylamino, dibenzylamino, diphenylamino and ditolylamino; aryloxy groups such as phenoxy; aromatic hydrocarbon groups such as phenyl and biphenyl; heteroaryl groups such as pyridyl and pyrrolyl; and cyano, hydroxyl and thiol groups.

[0046] HOMO(H1), HOMO(H2), HOMO(H3), HOMO(D1), HOMO(D2) and HOMO(D3) represent the HOMO (highest occupied molecular orbital) energy levels of the first organic compound, the second organic compound, the third organic compound, the first metal complex, the second metal complex and the third metal complex, respectively.

[0047] LUMO(H1), LUMO(H2), LUMO(H3), LUMO(D1), LUMO(D2) and LUMO(D3) represent the LUMO (lowest unoccupied molecular orbital) energy levels of the first organic compound, the second organic compound, the third organic compound, the first metal complex, the second metal complex and the third metal complex, respectively.

[0048] C1(H1), C1(D1) and C1(D3) represent the concentrations of the first organic compound in the first light-emitting layer, the first metal complex in the first light-emitting layer and the third metal complex in the first light-emitting layer, respectively. The concentrations are expressed as a weight ratio.

[0049] C2(H2), C2(H3) and C2(D2) respectively represent the concentrations of the second organic compound in the second light-emitting layer, the third organic compound in the second light-emitting layer and the second metal complex in the second light-emitting layer. The concentrations are expressed as a weight ratio.

[0050] Carriers refer to positive holes (holes), electrons, or positive holes and electrons.

[0051] The durability of an organic light-emitting device may also be described as the durability of a light-emitting layer, and may be evaluated based on the degradation of light-emitting luminance.

[0052] (1) Organic light-emitting devices

[0053] The organic light-emitting device according to the present invention comprises an anode, a first light-emitting layer, a second light-emitting layer and a cathode in sequence, wherein the first light-emitting layer and the second light-emitting layer are in contact with each other, the first light-emitting layer comprises a first organic compound and a first metal complex, the second light-emitting layer comprises a second organic compound, a third organic compound and a second metal complex, the third organic compound is not a metal complex, and the following relationships (a) to (c) are established:

[0054] (a) HOMO(D1)>HOMO(H1)

[0055] (b)LUMO(H2)>LUMO(H3)

[0056] (c)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3).

[0057] Relationship (a) indicates that the HOMO level of the first metal complex contained in the first light-emitting layer is higher (closer to the vacuum level) than the HOMO level of the first organic compound contained in the first light-emitting layer. In other words, the first light-emitting layer is a hole-trapping light-emitting layer.

[0058] Relationship (b) indicates that the LUMO level of the second organic compound contained in the second emitting layer is lower (further away from the vacuum level) than the LUMO level of the third organic compound contained in the second emitting layer. In other words, the second emitting layer is an electron-trapping emitting layer.

[0059] Relationship (c) indicates that the difference in HOMO energy level between the first organic compound and the first metal complex contained in the first light-emitting layer is greater than the difference in LUMO energy level between the second organic compound and the third organic compound contained in the second light-emitting layer. In other words, the hole-capturing property of the first light-emitting layer is greater than the electron-capturing property of the second light-emitting layer.

[0060] Below, we will refer to Figure 1 and Figure 2 The organic light emitting device according to the present invention is described in more detail.

[0061] Figure 1 is a schematic cross-sectional view of an organic light emitting device according to this embodiment. Figure 1 The organic light-emitting device in the embodiment includes an anode 2, a hole transport layer 3, a first light-emitting layer 4a, a second light-emitting layer 4b, an electron transport layer 5 and a cathode 6 which are sequentially arranged on an insulating layer 1.

[0062] In this specification, the light-emitting layer refers to a layer that emits light in an organic compound layer disposed between an anode and a cathode. The first light-emitting layer includes a first organic compound and a first metal complex, and the second light-emitting layer includes a second organic compound, a third organic compound, and a second metal complex. The first light-emitting layer may also include a third metal complex. In the first light-emitting layer, the weight ratio of the first organic compound may be greater than the weight ratio of the first metal complex. In the second light-emitting layer, the weight ratio of the second organic compound may be greater than the weight ratio of the third organic compound, and may be greater than the weight ratio of the second metal complex.

[0063] Among the compounds included in the light-emitting layer, the compound having the largest weight ratio may be referred to as a "host material" or "host". More specifically, the host material is a material whose weight ratio in the light-emitting layer is greater than 50 weight % among the materials included in the light-emitting layer. In the first light-emitting layer, the host material may be a first organic compound. In the second light-emitting layer, the host material may be a second organic compound.

[0064] Among the compounds included in the light-emitting layer, the compound that contributes to the main light emission may be referred to as a "guest (dopant) material" or "guest (dopant)". More specifically, the guest material is a material whose weight ratio in the light-emitting layer is less than 50 weight % among the materials included in the light-emitting layer. In order to suppress concentration quenching, the concentration of the guest material in the light-emitting layer is preferably 0.1 weight % or more and 40 weight % or less, more preferably 30 weight % or less. In the first light-emitting layer, the guest material may be a first metal complex. In the second light-emitting layer, the guest material may be a second metal complex.

[0065] Among the compounds included in the light-emitting layer, the compound that assists the light emission of the guest material may be referred to as an "assistant material" or "assist". More specifically, the assistant material is a compound that has a smaller mass ratio than the host among the compounds constituting the light-emitting layer and assists the light emission of the guest material. In the first light-emitting layer, the assistant material may be a third metal complex. In the second light-emitting layer, the assistant material may be a third organic compound.

[0066] Figure 2 is an energy diagram schematically showing energy levels around a light-emitting layer included in the organic EL device of the present invention.

[0067] like Figure 2 As shown, in the present invention, the above relationships (a) to (c) hold between the first organic compound and the first metal complex contained in the first light-emitting layer 4a and the second organic compound, the second metal complex and the third organic compound contained in the second light-emitting layer 4b.

[0068] As the HOMO energy level and LUMO energy level of the first organic compound, the second organic compound, the third organic compound, the first metal complex, the second metal complex and the third metal complex, the measured value can be used, or the value determined by molecular orbital calculation can be used. In this manual, molecular orbital calculation is carried out using the density functional theory (DFT) widely used now. In molecular orbital calculation, B3LYP functional and 6-31G* basis function are used.More specifically, molecular orbital calculations were performed by Gaussian09 (Gaussian09, RevisionC.01, MJ Frisch, GW Trucks, HB Schlegel, GEScuseria, MA Robb, J R Cheeseman, G. Scalmani, V. Barone, B. Mennucci, GA Petersson, H. Nakatsuji, M. Caricato, X. Li, HP Hratchian, AFIzmaylov ,J.Bloino,G.Zheng,JLSonnenberg,M.Hada,M.Ehara,K.Toyota,R.Fukuda,J.Hasegawa,M.Ishida,T.Nakajima,Y.Hon da,O.Kitao,H.Nakai,T.Vreven,JAMontgomery,Jr.,JEPeralta,F.Ogliaro,M.Bearpark,JJHeyd,E.Brothers,KNKudin ,VNStaroverov,T.Keith,R.Kobayashi,J.Normand,K.Raghavachari,A.Rendell,JCBurant,SSIyengar,J.Tomasi,M.C ossi,N.Rega,JMMillam,M.Klene,JEKnox,JBCross,V.Bakken,C.Adamo,J.Jaramillo,R.Gomperts,REStratmann,O.Yaz yev, AJAustin, R.Cammi, C.Pomelli, JWOchterski, RLMartin, K.Morokuma, VGZakrzewski, GAVoth, P.Salvador, JJDannenberg, S.Dapprich, ADDaniels, O.Farkas, JBForesman, JVOrtiz, J.Cioslowski, and DJFox, Gaussian, Inc., Wallingford CT, 2010). The method for determining the measured value will be described in the examples described later.

[0069] The organic light emitting device according to the present invention has the following features.

[0070] (1-1) Two light-emitting layers are in contact with each other, the light-emitting layer arranged on the anode side is a hole-trapping light-emitting layer, and the light-emitting layer arranged on the cathode side is an electron-trapping light-emitting layer.

[0071] (1-2) The hole-trapping property of the first light-emitting layer is greater than the electron-trapping property of the second light-emitting layer.

[0072] These features will be described below.

[0073] (1-1) Two light-emitting layers are in contact with each other, the light-emitting layer arranged on the anode side is a hole-trapping light-emitting layer, and the light-emitting layer arranged on the cathode side is an electron-trapping light-emitting layer.

[0074] The organic light-emitting device according to the present invention has the above-mentioned constitution. Specifically, satisfying the relations (a) and (b) allows holes injected from the anode to be easily captured in the first light-emitting layer and allows electrons injected from the cathode to be easily captured in the second light-emitting layer. Therefore, the recombination region of electrons and holes is less likely to be concentrated in the first light-emitting layer, and the degradation of the material in the light-emitting layer can be reduced. As a result, the organic light-emitting device according to the present invention is an organic light-emitting device with excellent durability.

[0075] The organic light-emitting device according to the present invention has two light-emitting layers in contact with each other. Each light-emitting layer contains a metal complex as a light-emitting material. The metal complex tends to have a high HOMO energy level (close to the vacuum level). Therefore, the light-emitting layer containing the metal complex tends to become a hole-trapping light-emitting layer. Therefore, when the two light-emitting layers of the organic light-emitting device are composed only of hole-trapping light-emitting layers, the recombination region of electrons and holes is easily localized in the light-emitting layer configured on the anode side.

[0076] The inventors have found that by configuring an electron-capturing light-emitting layer on the cathode side, the recombination region of electrons and holes is less likely to be locally present in a single light-emitting layer. Specifically, the second light-emitting layer configured on the cathode side contains a third organic compound that exhibits electron-capturing properties. As described above, metal complexes tend to have a high HOMO energy level (close to the vacuum level) and are therefore less likely to exhibit electron-capturing properties. This is because compounds with a high HOMO energy level also tend to have a high LUMO energy level. Therefore, the third organic compound is not a metal complex but an organic compound. The LUMO energy level of the third organic compound is lower than the LUMO energy level of the second organic compound contained in the second light-emitting layer (further away from the vacuum level). The organic light-emitting device according to the present invention has the above-mentioned constitution and is therefore an organic light-emitting device with excellent durability.

[0077] (1-2) The hole-trapping property of the first light-emitting layer is greater than the electron-trapping property of the second light-emitting layer.

[0078] In the organic light-emitting device according to the present invention, the hole-trapping property of the first light-emitting layer is greater than the electron-trapping property of the second light-emitting layer. Specifically, the organic light-emitting device according to the present invention is an organic light-emitting device that satisfies the relationship (c):

[0079] (c)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3).

[0080] In the organic light-emitting device according to the present invention, the first light-emitting layer has high hole-trapping properties, so that the injection or transport of excess holes to the second light-emitting layer can be suppressed. Therefore, the organic light-emitting device of the present invention has excellent durability due to the control of the carrier balance in the light-emitting layer.

[0081] In the organic light-emitting devices disclosed in Patent Documents 1 to 3, an organic compound having a carbazole skeleton is used as a host material of a light-emitting layer arranged on the anode side. However, since the organic compound having a carbazole skeleton has excellent hole transport properties, holes are easily injected or transported to the adjacent second light-emitting layer. Therefore, holes are excessively present in the second light-emitting layer, thereby destroying the carrier balance of the light-emitting layer, which is not preferable from the viewpoint of the durability of the organic light-emitting device.

[0082] The organic light-emitting device according to the present invention preferably further has the following constitution. Only one of the following constitutions may be satisfied, or a plurality of constitutions may be satisfied simultaneously.

[0083] (1-3) The first light-emitting layer and the second light-emitting layer further satisfy the following relationship (d):

[0084] (d)C2(H3)>C1(D1).

[0085] (1-4) The second light-emitting layer further satisfies the following relationship (e):

[0086] (e)HOMO(H2)>HOMO(H3).

[0087] (1-5) The second light-emitting layer further satisfies the following relationship (f):

[0088] (f)LUMO(D2)>LUMO(H3).

[0089] (1-6) The first light-emitting layer further contains a third metal complex, and at least one ligand contained in the third metal complex is the same as the ligand contained in the second metal complex.

[0090] (1-7) The first light-emitting layer satisfies the following relationship (h):

[0091] (h)C1(D3)>C1(D1).

[0092] (1-8) The first light-emitting layer and the second light-emitting layer further satisfy the following relationships (i) and (j):

[0093] (i)|LUMO(D3)-LUMO(D2)|≤0.2eV

[0094] (j)|HOMO(D3)-HOMO(D2)|≤0.2eV.

[0095] (1-9) The first light-emitting layer and the second light-emitting layer further satisfy the following relationship (k):

[0096] (k)HOMO(D3)>HOMO(H1).

[0097] (1-10) The emission wavelength of the first metal complex is longer than the emission wavelength of the second metal complex.

[0098] (1-11) The thickness of the first light-emitting layer is smaller than the thickness of the second light-emitting layer.

[0099] (1-12) The second metal complex and the third metal complex are the same compound.

[0100] (1-13) The first organic compound and the second organic compound are the same compound.

[0101] (1-14) The first light-emitting layer and the second light-emitting layer further satisfy the following relationship (n):

[0102] (n)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3)≥0.15eV.

[0103] These configurations will be described below.

[0104] (1-3) The first light-emitting layer and the second light-emitting layer further satisfy the following relationship (d):

[0105] (d)C2(H3)>C1(D1).

[0106] When the organic light emitting device according to the present invention further satisfies the relationship (d), an organic light emitting device having excellent durability can be provided.

[0107] As described in (1-2), the organic light-emitting device according to the present invention satisfies the relationship (c) and therefore has a configuration in which holes can be more easily captured in the light-emitting layer. The inventors have found that the balance of captured carriers can be more preferably adjusted by reducing the concentration of the first metal complex that mainly contributes to the performance of hole capture properties to be lower than the concentration of the third organic compound that mainly contributes to the performance of electron capture properties. Specifically, the first metal complex and the third organic compound satisfy the relationship (d). In the case of this configuration, the first light-emitting layer and the second light-emitting layer capture holes and electrons in a well-balanced manner, thereby adjusting the carrier balance in the light-emitting layer. As a result, the organic light-emitting device according to the present invention has excellent durability.

[0108] (1-4) The second light-emitting layer further satisfies the following relationship (e):

[0109] (e)HOMO(H2)>HOMO(H3).

[0110] As described in (1-1), the first light-emitting layer configured on the anode side has a hole-capturing property, and the second light-emitting layer configured on the cathode side has an electron-capturing property. Here, the second light-emitting layer preferably has a low hole-capturing property. Specifically, the second organic compound and the third organic compound preferably satisfy relationship (e). The reason is as follows: when the second light-emitting layer has a high hole-capturing property, the second light-emitting layer has both electron-capturing and hole-capturing properties. In this case, the recombination region of electrons and holes tends to be concentrated in the second light-emitting layer, which may lead to degradation of the material of the light-emitting layer. Therefore, the HOMO energy level of the third organic compound is preferably lower than the HOMO energy level of the second organic compound (further away from the vacuum energy level). When the above relationship is met, the organic light-emitting device according to the present invention has excellent durability.

[0111] (1-5) The second light-emitting layer further satisfies the following relationship (f):

[0112] (f)LUMO(D2)>LUMO(H3).

[0113] As described in (1-1), the second light-emitting layer disposed on the cathode side has electron capture properties. Here, the third organic compound preferably has a LUMO energy level lower than (further away from the vacuum level) than the second metal complex. Specifically, the second metal complex and the third organic compound preferably satisfy relationship (f). When the above relationship is satisfied, the electron capture of the second metal complex used as a light-emitting material is reduced, so that the degradation of the second metal complex can be reduced. Therefore, when the above relationship is satisfied, the organic light-emitting device according to the present invention has excellent durability.

[0114] More preferably, the relationship (g) is satisfied:

[0115] (g)C2(H3)>C2(D2).

[0116] In the second light-emitting layer, the third organic compound having a lower LUMO level (further from the vacuum level) is contained in a larger amount than the second metal complex, so that electron capture by the second metal complex can be further reduced. As a result, the organic light-emitting device according to the present invention has excellent durability.

[0117] (1-6) The first light-emitting layer further contains a third metal complex, and at least one ligand contained in the third metal complex is the same as the ligand contained in the second metal complex.

[0118] The organic light-emitting device according to the present invention preferably further comprises a material that promotes carrier transfer between the light-emitting layers. Specifically, the first light-emitting layer preferably further comprises a third metal complex having a ligand identical to the ligand contained in the second metal complex. When the above structure is used, ligands having the same structure can easily approach each other. This shortens the intermolecular distance between the second metal complex and the third metal complex. In the case of the above-mentioned configuration, carrier transfer between the first light-emitting layer and the second light-emitting layer is promoted via the second metal complex and the third metal complex, so that the organic light-emitting device according to the present invention has excellent luminous efficiency.

[0119] In addition, at least one ligand contained in the first metal complex is preferably the same as the ligand in the third metal complex. In this case, the compatibility between the first metal complex and the third metal complex is improved. Therefore, the transfer of carriers between the first light-emitting layer and the second light-emitting layer is further promoted. Therefore, the organic light-emitting device according to the present invention has excellent luminous efficiency.

[0120] The specific examples of the ligands included in the first to third metal complexes are as follows. However, the present invention is not limited to these. The following examples include examples using the phenylpyridine skeleton as a typical skeleton of a bidentate ligand. A ligand, a monodentate ligand, a tridentate ligand and a tetradentate ligand with a condensed ring structure can be used. In each of the following structural formulas, although both of the two bonds between the ligand and the Ir metal are represented by dotted lines, one dotted line is a covalent bond, and the other is a coordination bond.

[0121] [Chemical formula 1]

[0122]

[0123] (1-7) The first light-emitting layer further satisfies the following relationship (h):

[0124] (h)C1(D3)>C1(D1).

[0125] In the organic light-emitting device according to the present invention, the first light-emitting layer preferably satisfies the relationship (h). Specifically, the concentration of the third metal complex in the first light-emitting layer is preferably higher than the concentration of the first metal complex in the first light-emitting layer. As described in (1-6), at least one ligand contained in the third metal complex is the same as the ligand contained in the second metal complex. Therefore, carriers can be easily transferred between the first light-emitting layer and the second light-emitting layer via the second metal complex and the third metal complex. For this reason, when the concentration of the third metal complex in the first light-emitting layer is higher than the first metal complex in the first light-emitting layer, carrier transfer can be further promoted. As a result, the organic light-emitting device according to the present invention has excellent luminous efficiency.

[0126] (1-8) The first light-emitting layer and the second light-emitting layer further satisfy the following relationships (i) and (j):

[0127] (i)|LUMO(D3)-LUMO(D2)|≤0.2eV

[0128] (j)|HOMO(D3)-HOMO(D2)|≤0.2eV.

[0129] As described above, when the first light-emitting layer includes the third metal complex, carriers are easily transferred between the first light-emitting layer and the second light-emitting layer via the second metal complex and the third metal complex. Preferably, the HOMO energy level difference and the LUMO energy level difference between the second metal complex and the third metal complex are small. Specifically, the second metal complex and the third metal complex preferably satisfy relations (i) and (j). When the above relations are satisfied, carrier transfer between the first light-emitting layer and the second light-emitting layer is further promoted. As a result, the organic light-emitting device according to the present invention has excellent luminous efficiency.

[0130] (1-9) The first light-emitting layer and the second light-emitting layer further satisfy the following relationship (k):

[0131] (k)HOMO(D3)>HOMO(H1).

[0132] In the organic light-emitting device according to the present invention, the HOMO energy level of the third metal complex contained in the first light-emitting layer is preferably higher than the HOMO energy level of the first organic compound (closer to the vacuum energy level). When the relationship (k) is satisfied, holes are easily captured in the third metal complex. As described above, carriers are easily transferred between the first light-emitting layer and the second light-emitting layer via the second metal complex and the third metal complex. When the relationship (k) is satisfied, the third metal complex easily captures holes, thereby further promoting the carrier transfer between the first light-emitting layer and the second light-emitting layer. Therefore, the organic light-emitting device according to the present invention has excellent luminous efficiency.

[0133] In addition, the HOMO energy level difference between the third metal complex and the first organic compound can be 0.10 eV or more, preferably 0.15 eV or more, more preferably 0.5 eV or more, and particularly preferably 0.8 eV or more. This is because the larger HOMO energy level difference between the third metal complex and the first organic compound leads to a higher hole capture property of the third metal complex.

[0134] As described in (1-2), metal complexes tend to have high HOMO energy levels (close to the vacuum level) and thus can satisfy the relationship (1):

[0135] (l)HOMO(D3)-HOMO(H1)>LUMO(H2)-LUMO(H3).

[0136] Therefore, the concentration of the first metal complex in the first light-emitting layer, the concentration of the third metal complex in the first light-emitting layer, and the concentration of the third organic compound in the second light-emitting layer preferably satisfy the relationship (m):

[0137] (m)C2(H3)>C1(D3),C1(D1).

[0138] When the concentration of the third organic compound having electron-capturing property is higher than the concentration of the third metal complex having hole-capturing property and the first metal complex, the first light-emitting layer and the second light-emitting layer can capture holes and electrons in a well-balanced manner. As a result, the carrier balance in the light-emitting layer is adjusted, and thus the organic light-emitting device according to the present invention has excellent durability.

[0139] (1-10) The emission wavelength of the first metal complex is longer than the emission wavelength of the second metal complex.

[0140] In the organic light-emitting device according to the present invention, in order to further improve the luminous efficiency of each of the first light-emitting layer and the second light-emitting layer, the luminous wavelength of the first metal complex is preferably longer than the luminous wavelength of the second metal complex. When the organic light-emitting device according to the present invention has the above-mentioned constitution, energy can be transferred from the second light-emitting layer emitting higher energy light to the first light-emitting layer emitting lower energy light. This makes it possible to further improve the luminous efficiency of each of the first light-emitting layer and the second light-emitting layer. Specifically, the first metal complex may be a metal complex emitting red light, and the second metal complex may be a metal complex emitting green light. In this case, the organic light-emitting device according to the present invention can emit yellow light by luminescence from the first light-emitting layer and the second light-emitting layer. The first metal complex may be a metal complex emitting green light and the second metal complex may be a metal complex emitting blue light. In this case, the organic light-emitting device according to the present invention can emit cyan light by luminescence from the first light-emitting layer and the second light-emitting layer.

[0141] In this specification, a blue luminescent material refers to a material that emits light with a maximum peak wavelength of 430nm to 480nm in the luminescence spectrum. A green luminescent material refers to a material that emits light with a maximum peak wavelength of 500nm to 570nm in the luminescence spectrum. A red luminescent material refers to a material that emits light with a maximum peak wavelength of 580nm to 680nm in the luminescence spectrum. Yellow luminescence indicates that the main part of the luminescence spectrum is included in 565nm to 590nm. For example, yellow luminescence can also be obtained by mixing green luminescence and red luminescence. Cyan luminescence indicates that the main part of the luminescence spectrum is included in 485nm to 500nm. For example, cyan luminescence can also be obtained by mixing blue luminescence and green luminescence. The luminescence spectrum can be measured using, for example, a dilute toluene solution to reduce the influence of other compounds and crystalline states.

[0142] (1-11) The thickness of the first light-emitting layer is smaller than the thickness of the second light-emitting layer.

[0143] When the organic light-emitting device according to the present invention has the configuration described in (1-10), the thickness of the first light-emitting layer is preferably smaller than the thickness of the second light-emitting layer. At this time, the recombination region of electrons and holes is easily localized on the second light-emitting layer side. This further promotes energy transfer from the second light-emitting layer emitting higher energy light to the first light-emitting layer emitting lower energy light. As a result, an organic light-emitting device with excellent luminous efficiency can be provided.

[0144] (1-12) The second metal complex and the third metal complex are the same compound.

[0145] In the organic light-emitting device according to the present invention, the second metal complex and the third metal complex are preferably the same compound. In the case of the above-mentioned structure, due to the smaller energy difference between the first light-emitting layer and the second light-emitting layer, carrier transfer can be further promoted. In particular, when the emission wavelength of the first metal complex is longer than the emission wavelength of the second metal complex, energy transfer can also be promoted. Therefore, the organic light-emitting device according to the present invention has excellent durability and luminous efficiency.

[0146] (1-13) The first organic compound and the second organic compound are the same compound.

[0147] In the organic light-emitting device according to the present invention, the first organic compound and the second organic compound are preferably the same compound. In the case of the above-mentioned structure, due to the smaller energy difference between the first light-emitting layer and the second light-emitting layer, carrier transfer can be further promoted. In particular, when the emission wavelength of the first metal complex is longer than the emission wavelength of the second metal complex, energy transfer can also be promoted. Therefore, the organic light-emitting device according to the present invention has excellent durability and luminous efficiency.

[0148] (1-14) The first light-emitting layer and the second light-emitting layer further satisfy the following relationship (n):

[0149] (n)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3)≥0.10eV.

[0150] When the organic light emitting device according to the present invention satisfies the relationship (n), an organic light emitting device having excellent durability can be provided.

[0151] As described in (1-1), the organic light-emitting device according to the present invention has a structure in which the first light-emitting layer easily captures holes and the second light-emitting layer easily captures electrons. The inventors focused on the size of the HOMO energy level difference between the first metal complex and the first organic compound and the size of the LUMO energy level difference between the second organic compound and the third organic compound. Since the size of the carrier-capturing property of the light-emitting layer tends to be proportional to the HOMO (LUMO) energy level difference between the compounds contained in each light-emitting layer, it is preferred that there is a certain HOMO (LUMO) energy level difference. Therefore, the organic light-emitting device according to the present invention preferably satisfies the relationship (n).

[0152] Specifically, in the first light-emitting layer, the HOMO level difference between the first metal complex and the first organic compound may be 0.10 eV or more, preferably 0.15 eV or more, more preferably 0.30 eV or more, even more preferably 0.50 eV or more, and particularly preferably 1.0 eV or more.

[0153] In the second light-emitting layer, the LUMO level difference between the second organic compound and the third organic compound may be 0.10 eV or more, preferably 0.15 eV or more, more preferably 0.30 eV or more, and particularly preferably 0.40 eV or more.

[0154] When the organic light-emitting device according to the present invention satisfies the relationship (n), the first light-emitting layer and the second light-emitting layer each more easily capture holes and electrons, so that the carrier balance in the light-emitting layer can be further adjusted. As a result, the organic light-emitting device according to the present invention has excellent durability.

[0155] (2) First to third metal complexes

[0156] The first to third metal complexes used in the embodiment of the present invention are not particularly limited as long as they are metal complexes, but are preferably metal complexes represented by the following general formula [1]:

[0157] Ir(L)q(L')r(L")s[1].

[0158] In the general formula [1], L, L' and L" each represent a different bidentate ligand.

[0159] q is an integer from 1 to 3, and r and s are each an integer from 0 to 2, provided that q+r+s=3. When r is 2, multiple L's may be the same or different. When s is 2, multiple L"s may be the same or different.

[0160] The partial structure Ir(L)q is a structure represented by the following general formulas [Ir-1] to [Ir-16].

[0161] [Chemical formula 2]

[0162]

[0163] [Chemical formula 3]

[0164]

[0165] In each of the general formulas [Ir-1] to [Ir-16], Ar1 and Ar2 are each independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group. When there are multiple Ar1 or Ar2, multiple Ar1 or Ar2 can be the same substituent or different substituents. Ar1 and Ar2 can each be an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an aryl group having 6 to 10 carbon atoms, an alkyl-substituted silyl group or a cyano group. In particular, an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms is preferred. Methyl, ethyl, isopropyl, tert-butyl or phenyl is more preferred. These substituents have relatively small molecular weights and bulky structures. Therefore, compounds having these substituents have excellent sublimation properties.

[0166] X is selected from oxygen atom, sulfur atom, C (R1) (R2) and NR3. R1 to R3 are each independently selected from hydrogen atom, deuterium atom, halogen atom, substituted or unsubstituted alkyl, substituted or unsubstituted alkoxy, substituted or unsubstituted amino, substituted or unsubstituted aryloxy, substituted or unsubstituted aryl, substituted or unsubstituted heterocyclic group, substituted or unsubstituted silyl and cyano. R1 and R2 can be bonded together to form a ring. R1 to R3 can each be an alkyl or phenyl having 1 to 3 carbon atoms. In particular, an alkyl or phenyl having 1 or 2 carbon atoms is preferred. Methyl is more preferred. When these substituents are included, overlapping of condensed rings can be suppressed, thus producing excellent sublimation.

[0167] p1 and p2 are integers of 0 to 4, respectively.

[0168] q is an integer from 1 to 3.

[0169] Each of the first to third metal complexes preferably has a fused ring structure in its ligand. Specifically, the metal complex preferably has a triphenylene skeleton, a phenanthrene skeleton, a fluorene skeleton, a benzofluorene skeleton, a dibenzofuran skeleton, a dibenzothiophene skeleton, a benzoisoquinoline skeleton or a naphthoisoquinoline skeleton in its ligand. More specifically, the metal complex is more preferably represented by any of the general formulas [Ir-5] to [Ir-16]. All of these skeletons have high planarity, so that the ligands are easily approached to each other. As a result, energy transfer by means of the Dexter mechanism is easily generated, so that an organic light-emitting device with excellent luminous efficiency can be provided.

[0170] The specific examples of the first to third metal complexes according to the present invention are as follows. However, the present invention is not limited to these. In the following structural formula, both bonds between the ligand and the iridium atom can be represented by solid lines. In such cases, one bond can be a covalent bond, and the other bond can be a coordination bond. When a solid line and a dotted line are mixed, a solid line can represent a covalent bond, and a dotted line can represent a coordination bond.

[0171] [Chemical formula 4]

[0172]

[0173] [Chemical formula 5]

[0174]

[0175] [Chemical formula 6]

[0176]

[0177] [Chemical formula 7]

[0178]

[0179] [Chemical formula 8]

[0180]

[0181] [Chemical formula 9]

[0182]

[0183] [Chemical formula 10]

[0184]

[0185] [Chemical formula 11]

[0186]

[0187] [Chemical formula 12]

[0188]

[0189] [Chemical formula 13]

[0190]

[0191] [Chemical formula 14]

[0192]

[0193] [Chemical formula 15]

[0194]

[0195] [Chemical formula 16]

[0196]

[0197] [Chemical formula 17]

[0198]

[0199] [Chemical formula 18]

[0200]

[0201] [Chemical formula 19]

[0202]

[0203] [Chemical formula 20]

[0204]

[0205] Among the above-mentioned exemplary compounds, the exemplary compounds belonging to the AA group and the BB group are compounds each having at least a phenanthrene skeleton in the ligand of the Ir complex, and therefore, these are compounds having particularly excellent stability.

[0206] Among the above-mentioned exemplary compounds, the exemplary compounds belonging to the CC group are compounds each having at least a triphenylene skeleton in the ligand of the Ir complex. Therefore, these are compounds having particularly excellent stability.

[0207] Among the above-mentioned exemplary compounds, the exemplary compounds belonging to the DD group are compounds each having at least a dibenzofuran skeleton or a dibenzothiophene skeleton in the ligand of the Ir complex. Since these compounds contain oxygen atoms or sulfur atoms in the ligands, the abundant lone pair electrons possessed by these atoms can further promote carrier transfer. Therefore, the compounds are particularly easy to adjust the carrier balance.

[0208] Among the above-mentioned exemplified compounds, the exemplified compounds belonging to the EE group, the FF group, and the GG group are compounds each having at least a benzofluorene skeleton in the ligand of the Ir complex. These compounds each further contain a substituent at the 9-position of fluorene. The fluorene ring has a substituent in a direction perpendicular to the in-plane direction of the fluorene ring; therefore, overlapping of condensed rings can be particularly suppressed. For this reason, the sublimation properties of these compounds are particularly excellent.

[0209] Among the above-mentioned exemplary compounds, the exemplary compounds belonging to the HH group are compounds each having at least a benzisoquinoline skeleton in the ligand of the Ir complex. These compounds contain nitrogen atoms in the ligands; therefore, due to the lone pair electrons and high electronegativity of these atoms, carrier transfer can be promoted. Therefore, the compounds are particularly easy to adjust the carrier balance.

[0210] Among the above-mentioned exemplary compounds, the exemplary compounds belonging to Group II are compounds each having at least a naphthoisoquinoline skeleton in the ligand of the Ir complex. These compounds contain nitrogen atoms in a condensed ring; therefore, due to the lone pair electrons and high electronegativity of these atoms, carrier transfer can be promoted. Therefore, the compounds are particularly easy to adjust the carrier balance.

[0211] Among the above-mentioned exemplary compounds, exemplary compounds belonging to Group JJ are compounds each represented by any of the general formulae [Ir-1] to [Ir-4]. These compounds have excellent sublimation properties, particularly because of their small molecular weight.

[0212] (3) The first to third organic compounds

[0213] The first and second organic compounds preferably have a high planarity structure. Specifically, the first and second organic compounds each preferably have a condensed ring structure containing three or more rings, and more preferably have at least any one of a dibenzothiophene skeleton, a dibenzofuran skeleton, a triphenylene skeleton, and a phenanthrene skeleton. When the compound has at least one of the above-mentioned skeletons, the high planarity structures can easily approach each other, so that carrier transfer can be further promoted.

[0214] In particular, each compound having a dibenzothiophene skeleton or a dibenzofuran skeleton contains an oxygen atom or a sulfur atom, and thus can enhance carrier transport due to the abundant lone pair electrons of these atoms. Therefore, the compound is particularly easy to adjust the carrier balance. In addition, the compound having a triphenylene skeleton or a phenanthrene skeleton is a compound with excellent durability.

[0215] The third organic compound is preferably a compound having excellent electron capture properties. Specifically, the compound has at least one of an azine skeleton, a thioxanthone skeleton, and a xanthone skeleton. The compound having at least one of the above skeletons has excellent electron-withdrawing properties and can reduce the LUMO energy level (further away from the vacuum energy level), thereby enhancing electron capture properties.

[0216] Specific examples of the first to third organic compounds are shown below. However, the present invention is not limited to these.

[0217] [Chemical formula 21]

[0218]

[0219] [Chemical formula 22]

[0220]

[0221] [Chemical formula 23]

[0222]

[0223] (4) Other compounds

[0224] Specific examples of other compounds that can be used in the organic light-emitting device according to the present invention are shown below.

[0225] As a hole injection and transport material that can be used for a hole injection layer or a hole transport layer, in order to facilitate the injection of holes from the anode and the transport of the injected holes to the light-emitting layer, a material with a high hole mobility is preferred. In order to suppress the degradation of film quality such as crystallization in an organic light-emitting device, a material with a high glass transition temperature is preferred. Examples of low-molecular or high-molecular-weight materials having hole injection and transport properties include triarylamine derivatives, arylcarbazole derivatives, phenylenediamine derivatives, stilbene derivatives, phthalocyanine derivatives, porphyrin derivatives, poly(vinylcarbazole), poly(thiophene) and other conductive polymers. In addition, hole injection and transport materials can also be used for electron blocking layers.

[0226] The following are specific examples of compounds used as hole injecting and transporting materials, but the hole injecting and transporting materials are of course not limited thereto.

[0227] [Chemical formula 24]

[0228]

[0229] Examples of luminescent materials mainly associated with the luminescent function include, in addition to the metal complexes represented by the general formulas [Ir-1] to [Ir-16], condensed ring compounds such as fluorene derivatives, naphthalene derivatives, pyrene derivatives, perylene derivatives, tetracene derivatives, anthracene derivatives and rubrene, etc.; quinacridone derivatives; coumarin derivatives; stilbene derivatives; organic aluminum complexes such as tris(8-quinolinolato)aluminum; iridium complexes; platinum complexes; rhenium complexes; copper complexes; europium complexes; ruthenium complexes; and polymer derivatives such as poly(phenylene vinylene) derivatives, poly(fluorene) derivatives and poly(phenylene) derivatives, etc.

[0230] Specific examples of compounds that can be used as the light-emitting material are shown below, but the light-emitting material is of course not limited thereto.

[0231] [Chemical formula 25]

[0232]

[0233] [Chemical formula 26]

[0234]

[0235] [Chemical formula 27]

[0236]

[0237] Examples of the main material or auxiliary material contained in the light-emitting layer include aromatic hydrocarbon compounds and their derivatives, carbazole derivatives, dibenzofuran derivatives, dibenzothiophene derivatives, organic aluminum complexes such as tris (8-hydroxyquinoline) aluminum, and organic beryllium complexes. Specific examples thereof include, but are certainly not limited to, the compounds represented by EM1 to EM84 above.

[0238] The electron transport material can be arbitrarily selected from materials capable of transporting electrons injected from the cathode to the light emitting layer and can be selected in consideration of, for example, the balance with the hole mobility of the hole transport material. Examples of materials having electron transport properties include oxadiazole derivatives, oxazole derivatives, pyrazine derivatives, triazole derivatives, triazine derivatives, quinoline derivatives, quinoxaline derivatives, phenanthroline derivatives, organoaluminum complexes, and condensed ring compounds such as fluorene derivatives, naphthalene derivatives, Derivatives and anthracene derivatives, etc. The above-mentioned electron transporting materials are also suitable for the hole blocking layer.

[0239] Specific examples of the compound used as the electron transporting material are shown below, but the compound is of course not limited thereto.

[0240] [Chemical formula 28]

[0241]

[0242] (5) Composition of organic light-emitting devices

[0243] Constituent members other than the organic compound layer constituting the organic light-emitting device according to the present embodiment will be described below.

[0244] The organic light emitting device includes an insulating layer, a first electrode, an organic compound layer, and a second electrode above a substrate. A protective layer, a color filter, a microlens, etc. may be provided above the second electrode. A color filter may be provided on the protective layer. In this case, a planarization layer may be provided between the protective layer and the color filter. The planarization layer may be composed of, for example, an acrylic resin, etc. A microlens may be provided on the color filter. The same applies when a planarization layer is provided between the color filter and the microlens.

[0245] [Substrate]

[0246] Examples of substrates include quartz, glass, silicon wafers, resins, and metals. The substrate may include switching elements such as transistors, wiring, and an insulating layer thereon. As long as the contact hole can be formed in such a way that the wiring can be connected to the first electrode and as long as insulation from unconnected wiring can be ensured, any material may be used for the insulating layer. For example, resins such as polyimide, silicon oxide, or silicon nitride may be used.

[0247] [electrode]

[0248] As the electrode, a pair of electrodes may be used. A pair of electrodes may be an anode and a cathode. When an electric field is applied in the direction in which the organic light-emitting device emits light, the electrode with a higher potential is the anode, and the other is the cathode. It can also be said that the electrode that supplies holes to the light-emitting layer is the anode and the electrode that supplies electrons is the cathode.

[0249] As the constituent material of the anode, a material having a work function as large as possible is preferred. Examples of materials that can be used include metal single substances such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium and tungsten, mixtures thereof, alloys of combinations thereof, and metal oxides such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO) and indium zinc oxide. In addition, conductive polymers such as polyaniline, polypyrrole and polythiophene can also be used.

[0250] These electrode materials may be used alone or in combination of two or more. The anode may be composed of a single layer or a plurality of layers.

[0251] When the anode is used as a reflective electrode, for example, chromium, aluminum, silver, titanium, tungsten, molybdenum, alloys thereof or stacks thereof may be used. These materials may also be used to act as a reflective film without an electrode function. When the anode is used as a transparent electrode, an oxide transparent conductive layer composed of, for example, indium tin oxide (ITO) or indium zinc oxide may be used; however, the anode is not limited thereto. The electrode may be formed by photolithography.

[0252] As the constituent material of the cathode, a material having a small work function is preferred. Examples thereof include metal elements, for example, alkali metals such as lithium, alkaline earth metals such as calcium, aluminum, titanium, manganese, silver, lead and chromium, and mixtures thereof. Alloys of combinations of these metal elements may also be used. For example, magnesium-silver, aluminum-lithium, aluminum-magnesium, silver-copper and zinc-silver may be used. Metal oxides such as indium tin oxide (ITO) may also be used. These electrode materials may be used alone or in combination of two or more. The cathode may have a single-layer structure or a multilayer structure. In particular, silver is preferably used. In order to reduce the aggregation of silver, a silver alloy is more preferred. As long as the aggregation of silver can be reduced, any alloy ratio may be used. The ratio of silver to other metals may be, for example, 1:1 or 3:1.

[0253] A top light-emitting device can be provided using a cathode formed of an oxide conductive layer composed of, for example, ITO. A bottom light-emitting device can be provided using a cathode formed of a reflective electrode composed of, for example, aluminum (Al). The cathode is not particularly limited. The method for forming the cathode is not particularly limited, but it is more preferred to use a DC sputtering method or an AC sputtering method, etc., because good film coverage is obtained and thus resistance is easily reduced.

[0254] [Organic compound layer]

[0255] The organic compound layer may be formed by a single layer or multiple layers. When there are multiple layers, they may be referred to as hole injection layers, hole transport layers, electron blocking layers, luminescent layers, hole blocking layers, electron transport layers, or electron injection layers, according to their functions. The organic compound layer may include multiple luminescent layers. When multiple luminescent layers are provided, a charge generation layer may be provided between one luminescent layer and another luminescent layer. Each luminescent layer may be stacked. For example, when a luminescent layer according to an embodiment of the present invention is provided, a charge generation layer and a third luminescent layer may be included. That is, the first luminescent layer, the second luminescent layer, the charge generation layer, and the third luminescent layer may be configured in this order, or the third luminescent layer, the charge generation layer, the first luminescent layer, and the second luminescent layer may be configured in this order. The organic compound layer is mainly composed of organic compounds and may contain inorganic atoms and inorganic compounds. For example, each organic compound layer may contain, for example, copper, lithium, magnesium, aluminum, iridium, platinum, molybdenum, or zinc. The organic compound layer may be configured between the first electrode and the second electrode, or may be configured to contact the first electrode and the second electrode.

[0256] [Protective layer]

[0257] A protective layer can be provided on the cathode. For example, a glass provided with a hygroscopic agent can be bonded to the cathode to reduce, for example, water intrusion into the organic compound layer, thereby reducing the occurrence of poor display. In another embodiment, a passivation film composed of, for example, silicon nitride can be provided on the cathode to reduce, for example, water intrusion into the organic compound layer. For example, after forming the cathode, the substrate can be transported to another chamber without destroying the vacuum, and a silicon nitride film having a thickness of 2 μm can be formed by a chemical vapor deposition (CVD) method to form a protective layer. After film formation by the CVD method, a protective layer can be formed by an atomic layer deposition (ALD) method. Examples of materials for the layer formed by the ALD method may include, but are not limited to, silicon nitride, silicon oxide, and aluminum oxide. Silicon nitride can be deposited on the layer formed by the ALD method by the CVD method. The film formed by the ALD method may have a smaller thickness than the film formed by the CVD method. Specifically, the thickness may be less than 50%, or even less than 10%.

[0258] [Color Filter]

[0259] A color filter may be provided on the protective layer. For example, in consideration of the size of the organic light-emitting device, the color filter may be provided on another substrate and attached to the substrate provided with the organic light-emitting device. The color filter may be formed by patterning on the protective layer using photolithography. The color filter may be composed of a polymer.

[0260] [Planarization layer]

[0261] A planarization layer may be configured between the color filter and the protective layer. The planarization layer is provided for the purpose of reducing the unevenness of the underlying layer. The planarization layer may be referred to as a "material resin layer" without limiting its purpose. The planarization layer may be composed of an organic compound, may be a low molecular weight or high molecular weight compound, and preferably a high molecular weight compound.

[0262] The planarization layer may be arranged above and below the color filter and may be composed of the same or different constituent materials. Specific examples thereof include polyvinyl carbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenolic resin, epoxy resin, silicone resin, and urea resin.

[0263] [Microlens]

[0264] The organic light-emitting device may include an optical component, such as a microlens, etc. on the light emitting side. The microlens may be composed of, for example, an acrylic resin or an epoxy resin. The microlens can be used to increase the amount of light emitted from the organic light-emitting device and control the direction of the emitted light. The microlens may have a hemispherical shape. In the case of a hemispherical shape, among the tangents of the hemisphere, there is a tangent parallel to the insulating layer. The junction of the tangent and the hemisphere is the vertex of the microlens. For any cross-sectional view, the vertex of the microlens can be determined in the same way. That is, among the tangents of the semicircle of the microlens in the cross-sectional view, there is a tangent parallel to the insulating layer, and the junction of the tangent and the semicircle is the vertex of the microlens.

[0265] The midpoint of the microlens may be defined. In a cross section of the microlens, when a line segment is drawn from a point where an arc shape ends to a point where another arc shape ends, the midpoint of the line segment may be referred to as the midpoint of the microlens. The cross section for determining the vertex and the midpoint may be a cross section perpendicular to the insulating layer.

[0266] [Counter substrate]

[0267] A relative substrate may be provided on the planarization layer. The relative substrate is provided at a position corresponding to the above-mentioned substrate and is therefore referred to as a relative substrate. The relative substrate may be formed of the same constituent material as the above-mentioned substrate. When the above-mentioned substrate is referred to as a first substrate, the relative substrate may be referred to as a second substrate.

[0268] [Organic layer]

[0269] The organic compound layer (eg, hole injection layer, hole transport layer, electron blocking layer, light emitting layer, hole blocking layer, electron transport layer or electron injection layer) included in the organic light emitting device according to an embodiment of the present invention is formed by the following method.

[0270] For the organic compound layer included in the organic light-emitting device according to the embodiment of the present invention, a dry method such as vacuum evaporation, ionization evaporation, sputtering or plasma can be used. Alternatively, instead of the dry method, a wet method can also be used, in which the material is dissolved in an appropriate solvent and then formed into a film by a known coating method (e.g., spin coating, dipping, casting, LB method or inkjet method).

[0271] When the layer is formed by, for example, a vacuum evaporation method or a solution coating method, crystallization or the like is less likely to occur, and good stability over time is obtained. In the case of forming a film by a coating method, the film may be formed in combination with an appropriate binder resin.

[0272] Examples of the binder resin include, but are not limited to, polyvinyl carbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenolic resin, epoxy resin, silicone resin, and urea resin.

[0273] These binder resins may be used alone as a homopolymer or a copolymer or in combination as a mixture of two or more. In addition, additives such as known plasticizers, antioxidants, and ultraviolet absorbers may be used as needed.

[0274] [Pixel circuit]

[0275] The light emitting device may include a pixel circuit connected to the light emitting device. The pixel circuit may be an active matrix type that independently controls the first light emitting device and the second light emitting device to emit light. The active matrix type circuit may be voltage programmed or current programmed. The driving circuit includes a pixel circuit for each pixel. The pixel circuit may include a light emitting device, a transistor for controlling the light emitting brightness of the light emitting device, a transistor for controlling the light emitting timing, a capacitor for maintaining the gate voltage of the transistor for controlling the light emitting brightness, and a transistor for not being connected to GND via the light emitting device.

[0276] The light emitting device includes a display area and a surrounding area configured around the display area. The display area includes a pixel circuit, and the surrounding area includes a display control circuit. The mobility of the transistor included in the pixel circuit may be lower than the mobility of the transistor included in the display control circuit.

[0277] The slope of the current-voltage characteristic of the transistor included in the pixel circuit may be smaller than the slope of the current-voltage characteristic of the transistor included in the display control circuit. The slope of the current-voltage characteristic may be measured by a so-called Vg-Ig characteristic.

[0278] The transistor included in the pixel circuit is a transistor connected to a light emitting device such as a first light emitting device or the like.

[0279] [Pixels]

[0280] The organic light emitting device includes a plurality of pixels. Each pixel includes sub-pixels configured to emit light of different colors from each other. The sub-pixels may have corresponding RGB emission colors.

[0281] The light is emitted from a region of the pixel also referred to as the pixel opening. This region is the same as the first region. The pixel opening may be less than 15 μm and may be greater than 5 μm. More specifically, the pixel opening may be, for example, 11 μm, 9.5 μm, 7.4 μm or 6.4 μm.

[0282] The distance between sub-pixels may be less than 10 μm, and specifically, may be 8 μm, 7.4 μm, or 6.4 μm.

[0283] In the plan view, the pixels can be arranged in a known configuration. For example, a stripe arrangement, a delta arrangement, a Pen Tile matrix arrangement or a Bayer arrangement can be used. The shape of each sub-pixel in the plan view can be any known shape. Examples include quadrilaterals such as rectangles and rhombuses, and hexagons. Of course, if the shape is close to a rectangle, rather than an exact shape, it is included in the rectangle. The shape of the sub-pixel and the pixel arrangement can be used in combination.

[0284] (6) Use of the organic light-emitting device according to the present embodiment

[0285] The organic light-emitting device according to the embodiment of the present invention can be used as a component of a display device or a lighting device. Other uses include exposure light sources for electrophotographic image forming devices, backlights for liquid crystal displays, and light-emitting devices including white light sources provided with color filters.

[0286] The display device may be an image information processing apparatus having an image input unit that receives image information from an area array CCD, a line array CCD, a memory card, etc., an information processing unit that processes the input information, and a display unit that displays the input image.

[0287] The display unit of the camera device or inkjet printer may have a touch panel function. The driving method of the touch panel function may be, but is not particularly limited to, an infrared method, an electrostatic capacitance method, a resistive film method, or an electromagnetic induction method. The display device may also be used in the display unit of a multifunction printer.

[0288] The display device according to the present embodiment is described below with reference to the drawings.

[0289] Figure 3A and Figure 3B Each is a schematic cross-sectional view of an example of a display device including an organic light-emitting device and a transistor connected to each organic light-emitting device. Each transistor is an example of an active element. The transistor may be a thin film transistor (TFT).

[0290] Figure 3A An example of a pixel as a constituent element of a display device according to the present embodiment is shown. The pixel includes a sub-pixel 10. The sub-pixels are divided into 10R, 10G, and 10B according to their luminescence. The luminescent color can be distinguished by the wavelength of the light emitted from the luminescent layer. The light emitted from the sub-pixel can be selectively transmitted or color-converted using, for example, a color filter. Each sub-pixel includes a reflective electrode 2 serving as a first electrode above an interlayer insulating layer 1, an insulating layer 3 covering the end of the reflective electrode 2, an organic compound layer 4 covering the first electrode and the insulating layer, a transparent electrode 5, a protective layer 6, and a color filter 7.

[0291] Transistors and capacitor elements may be arranged below or inside the interlayer insulating layer 1. Each transistor may be electrically connected to a corresponding one of the first electrodes through, for example, a contact hole (not shown).

[0292] The insulating layer 3 is also called a bank or a pixel separation film. The insulating layer covers the end of each first electrode and surrounds the first electrode. The portion not covered by the insulating layer is in contact with the organic compound layer 4 and serves as a light emitting region.

[0293] The organic compound layer 4 includes a hole injection layer 41 , a hole transport layer 42 , a first light emitting layer 43 , a second light emitting layer 44 , and an electron transport layer 45 .

[0294] The second electrode 5 may be a transparent electrode, a reflective electrode or a semi-transparent electrode.

[0295] The protective layer 6 reduces the penetration of moisture into the organic compound layer. Although the protective layer is shown as a single layer, the protective layer may be formed of a plurality of layers. Each layer may be an inorganic compound layer or an organic compound layer.

[0296] The color filters 7 are divided into 7R, 7G and 7B according to their colors. The color filters can be formed on a planarization film not shown. A resin protective layer not shown can be provided on the color filters. The color filters can also be formed on the protective layer 6. Alternatively, the color filters can be provided on a relative substrate such as a glass substrate and then bonded.

[0297] Figure 3B The display device 100 shown includes an organic light emitting device 26 and a TFT 18 as an example of a transistor. A substrate 11 composed of, for example, glass or silicon is provided, and an insulating layer 12 is provided thereon. Active elements such as the TFT 18 are arranged on the insulating layer. A gate electrode 13, a gate insulating film 14, and a semiconductor layer 15 of each active element are arranged. Each TFT 18 includes a semiconductor layer 15, a drain electrode 16, and a source electrode 17. An insulating film 19 is provided on the upper portion of the TFT 18. An anode 21 included in the organic light emitting device 26 is connected to the source electrode 17 through a contact hole 20 provided in the insulating film.

[0298] The manner of electrical connection between the electrodes (anode and cathode) included in each organic light emitting device 26 and the electrodes (source electrode and drain electrode) included in a corresponding one TFT is not limited to Figure 3B That is, it is sufficient that any one of the anode and the cathode is electrically connected to any one of the source electrode and the drain electrode of the TFT. The term "TFT" refers to a thin film transistor.

[0299] exist Figure 3BIn the illustrated display device 100 , each organic compound layer is illustrated as a single layer; however, the organic compound layer 22 may be formed of a plurality of layers. In order to reduce degradation of the organic light emitting device, a first protective layer 24 and a second protective layer 25 are provided on the cathode 23 .

[0300] Although in Figure 3B The display device 100 is shown using transistors as switching elements, but other switching elements may be used instead.

[0301] exist Figure 3B The transistor used in the display device 100 shown is not limited to a transistor using a single crystal silicon wafer, but may also be a thin film transistor including an active layer on an insulating surface of a substrate. Examples of the active layer include single crystal silicon, non-single crystal silicon materials such as amorphous silicon and microcrystalline silicon, and non-single crystal oxide semiconductors such as indium zinc oxide and indium gallium zinc oxide. A thin film transistor is also called a TFT element.

[0302] Figure 3B The transistor in the display device 100 shown may be formed in a substrate such as a Si substrate. The expression "formed in a substrate" means that the transistor is produced by processing the substrate itself such as a Si substrate. When the transistor is formed in the substrate, it can also be considered that the substrate and the transistor are formed integrally.

[0303] In the organic light-emitting device according to the present embodiment, the luminous brightness is controlled by a TFT element as an example of a switching element; therefore, an image can be displayed with a corresponding luminous brightness by arranging a plurality of organic light-emitting devices in a plane. The switching element according to the present embodiment is not limited to a TFT element and may be a low-temperature polysilicon transistor or an active matrix driver formed on a substrate such as a Si substrate. The expression "on a substrate" may also be said to be "in a substrate". Whether to form a transistor in a substrate or to use a TFT element is selected according to the size of the display portion. For example, when the display portion has a size of about 0.5 inches, the organic light-emitting device is preferably arranged on a Si substrate.

[0304] Figure 4 1 is a schematic diagram showing an example of a display device according to the present embodiment. The display device 1000 may include a touch panel 1003, a display panel 1005, a frame 1006, a circuit substrate 1007, and a battery 1008 between an upper cover 1001 and a lower cover 1009. The touch panel 1003 and the display panel 1005 are connected to flexible printed circuits FPC 1002 and 1004, respectively. The circuit substrate 1007 includes a printed transistor. Unless the display device is a portable device, it is not necessary to set the battery 1008, or even if the display device is a portable device, the battery 1008 may be set at a different position.

[0305] The display device according to the present embodiment may include a color filter having red, green and blue portions. In the color filter, the red, green and blue portions may be arranged in a delta arrangement.

[0306] The display device according to this embodiment can be used for the display part of a portable terminal. In this case, the display device can have both a display function and an operation function. Examples of portable terminals include mobile phones such as smartphones, tablet computers, and head-mounted displays.

[0307] The display device according to the present embodiment can be used for the display part of the camera device, which includes an optical part having a single or multiple lenses and an image pickup device that receives light through the optical part. The camera device may include a display part that displays information acquired by the image pickup device. The display part may be a display part that is exposed to the outside of the camera device or may be a display part configured in a viewfinder. The camera device may be a digital camera or a digital video camera.

[0308] Figure 5A 11 is a schematic diagram showing an example of an imaging device according to the present embodiment. The imaging device 1100 may include a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The viewfinder 1101 may include a display device according to the present embodiment. In this case, in addition to the image to be captured, the display device may also display environmental information and imaging instructions, etc. The environmental information may include, for example, the intensity of external light, the direction of external light, the moving speed of the subject, and the possibility that the subject is shielded by an obstruction.

[0309] The timing suitable for video recording is only a short time; therefore, it is best to display information as quickly as possible. Therefore, it is preferred to use a display device including an organic light-emitting device according to the present invention. This is because the organic light-emitting device has a fast response speed. A display device including an organic light-emitting device may be more suitable for such a device that needs to have a high display speed than a liquid crystal display device.

[0310] The camera device 1100 includes an optical unit not shown. The optical unit includes a single or multiple lenses and is configured to form an image on the camera device in the housing 1104. The relative position of the single or multiple lenses can be adjusted to adjust the focus. This operation can also be performed automatically. The camera device can also be called a photoelectric conversion device. Examples of camera methods used in the photoelectric conversion device can include a method for detecting differences from previous images and a method for cutting out an image from an image that has been recorded, instead of sequential camera shooting.

[0311] Figure 5B1200 includes a display unit 1201, an operating unit 1202, and a housing 1203. The housing 1203 can accommodate a circuit, a printed circuit board including the circuit, a battery, and a communication unit. The operating unit 1202 can be a button or a touch panel type reaction unit. The operating unit can be a biometric unit that recognizes fingerprints to unlock, etc. An electronic device including a communication unit can also be referred to as a communication device. The electronic device can further have a camera function by being equipped with a lens and a camera device. The image captured by the camera function is displayed on the display unit. Examples of electronic devices include smartphones and laptops.

[0312] Fig. 6A is a schematic diagram showing an example of the display device according to the present embodiment. Fig. 6A A display device such as a TV monitor or a PC monitor is shown. The display device 1300 includes a frame 1301 and a display portion 1302. The display portion 1302 may include the light emitting device according to the present embodiment.

[0313] A base 1303 is provided to support the frame 1301 and the display portion 1302. The base 1303 is not limited to Fig. 6A The underside of the frame 1301 can also be used as a base.

[0314] The frame 1301 and the display portion 1302 may be curved. The radius of curvature may be 5,000 mm or more and 6,000 mm or less.

[0315] Figure 6B is a schematic diagram showing another example of the display device according to the present embodiment. Figure 6B The display device 1310 shown can be folded and is a so-called foldable display device. The display device 1310 includes a first display portion 1311, a second display portion 1312, a housing 1313, and a bending point 1314. The first display portion 1311 and the second display portion 1312 may include a light-emitting device according to the present embodiment. The first display portion 1311 and the second display portion 1312 may be a single seamless display device. The first display portion 1311 and the second display portion 1312 may be separated from each other at the bending point. The first display portion 1311 and the second display portion 1312 may display images different from each other. Optionally, one image may be displayed in the first and second display portions.

[0316] Fig. 7A14 is a schematic diagram showing an example of a lighting device according to the present embodiment. The lighting device 1400 may include a housing 1401, a light source 1402, a circuit substrate 1403, an optical film 1404, and a light diffusion unit 1405. The light source may include an organic light-emitting device according to the present embodiment. The optical filter may be a filter that improves the color rendering of the light source. When used for lighting, etc., the light diffusion unit may effectively diffuse the light from the light source to transmit the light to a wide range. An optical filter and a light diffusion unit are provided on the light emitting side of the lighting device. A cover may be provided at the outermost portion as needed.

[0317] The lighting device is, for example, a device for lighting a room. The lighting device may emit white, natural white, or any color of light from blue to red. A dimming circuit for dimming may be provided. The lighting device may include an organic light emitting device of the present invention and a power supply circuit connected thereto. The power supply circuit is a circuit for converting an AC voltage into a DC voltage. The color temperature of white is 4200K, and the color temperature of natural white is 5000K. The lighting device may include a color filter.

[0318] The lighting device according to the present embodiment may include a heat dissipation portion. The heat dissipation portion is configured to release heat in the device to the outside of the device, and is composed of, for example, metal or liquid silicon having high specific heat.

[0319] Figure 7B 15 is a schematic diagram showing a car as an example of a moving body according to the present embodiment. The car includes a tail light as an example of a lamp. The car 1500 includes a tail light 1501 and can be configured to light up the tail light when an operation such as braking is performed.

[0320] The taillight 1501 may include an organic light emitting device according to the present embodiment. The taillight may include a protective member for protecting the organic EL device. The protective member may be made of any material as long as it has a certain degree of strength and is transparent. The protective member is preferably made of, for example, polycarbonate. The polycarbonate may be mixed with, for example, a furan dicarboxylic acid derivative or an acrylonitrile derivative.

[0321] The car 1500 may include a car body 1503 and a window 1502 attached thereto. The windows may be transparent displays unless they are windows for confirming the front and rear of the car. The transparent display may include an organic light-emitting device according to the present embodiment. In this case, constituent materials such as electrodes of the organic light-emitting device are formed of transparent members.

[0322] The mobile body according to the present embodiment may be, for example, a car, a ship, an aircraft or a drone. The mobile body may include a body and a lamp attached to the body. The lamp may emit light to indicate the position of the body. The lamp includes an organic light emitting device according to the present embodiment.

[0323] Will refer to Fig. 8A and Figure 8B An application example of the display device of the above embodiment is described. The display device can be used in a system that can be worn as a wearable device, such as smart glasses, HMD, and smart contact lenses. The camera display device used in such an application example includes a camera device that can perform photoelectric conversion on visible light and a display device that can emit visible light.

[0324] Fig. 8A A pair of glasses 1600 (smart glasses) according to an application example is shown. An imaging device 1602 such as a CMOS sensor or SPAD is provided on the front side of a lens 1601 of the glasses 1600. A display device according to any of the above embodiments is provided on the back side of the lens 1601.

[0325] The glasses 1600 further include a control device 1603. The control device 1603 serves as a power source for supplying power to the camera 1602 and the display device according to any embodiment. The control device 1603 controls the operation of the camera 1602 and the display device. The lens 1601 includes an optical system for focusing light onto the camera 1602.

[0326] Figure 8B A pair of glasses 1610 (smart glasses) according to an application example is shown. Glasses 1610 include a control device 1612. The control device 1612 includes a camera device equivalent to the camera device 1602, and a display device. The lens 1611 is provided with the camera device in the control device 1612 and an optical system for projecting light emitted from the display device. An image is projected onto the lens 1611. The control device 1612 serves as a power supply for supplying power to the camera device and the display device and controls the operation of the camera device and the display device. The control device may include a line of sight detection unit for detecting the line of sight of the wearer. Infrared rays can be used for line of sight detection. The infrared light emitting unit emits infrared light to the eyeball of the user who is looking at the displayed image. The image of the eyeball is captured by detecting the reflected infrared light from the eyeball with a camera unit having a light receiving element. The degradation of image quality is reduced by providing a reduction unit for reducing the light from the infrared light emitting unit to the display unit when viewed in a plan view.

[0327] The user's line of sight to the displayed image is detected from an image of the eyeball captured using infrared light. Any known method may be used for line of sight detection using a captured image of the eyeball. As an example, a line of sight detection method based on a Purkinje image of reflection of irradiated light on the cornea may be used.

[0328] More specifically, the gaze detection process is performed based on the pupil-corneal reflection method, which detects the user's gaze by calculating a gaze vector indicating the direction (rotation angle) of the eyeball based on the pupil image and the Purkinje image included in the captured image of the eyeball.

[0329] A display device according to an embodiment of the present invention may include an imaging device having a light receiving element, and an image displayed on the display device may be controlled based on line of sight information of a user from the imaging device.

[0330] Specifically, in the display device, a first field of view area that the user is looking at and a second field of view area outside the first field of view area are determined based on the line of sight information. The first field of view area and the second field of view area may be determined by a control device of the display device or may be determined by receiving those determined by an external control device. In the display area of ​​the display device, the display resolution of the first field of view area may be controlled to be higher than the display resolution of the second field of view area. That is, the resolution of the second field of view area may be lower than the resolution of the first field of view area.

[0331] The display area includes a first display area and a second display area different from the first display area. Based on the line of sight information, a higher priority area is determined from the first display area and the second display area. The first field of view area and the second field of view area can be determined by a control device of the display device or can be determined by receiving those determined by an external control device. The resolution of the higher priority area can be controlled to be higher than the resolution of the area other than the higher priority area. In other words, the resolution of the relatively lower priority area may be low.

[0332] Artificial intelligence (AI) can be used to determine the first field of view area and the high priority area. AI can be a model constructed to use the image of the eyeball and the actual line of sight direction of the eyeball in the image as teaching data to infer the angle of sight and the distance to the target object located in the line of sight direction from the image of the eyeball. The AI ​​program can be stored in a display device, a camera device, or an external device. When the AI ​​program is stored in an external device, the AI ​​program is transmitted to the display device via communication.

[0333] In the case of controlling the display based on visual detection, it is preferable to use smart glasses that further include a camera device for capturing external images. The smart glasses can display the captured external information in real time.

[0334] Fig. 9ASchematic diagram of an example of an image forming apparatus according to an embodiment of the present invention. The image forming apparatus 40 is an electrophotographic image forming apparatus and includes a photoreceptor 27, an exposure light source 28, a charging unit 30, a developing unit 31, a transferrer 32, a conveyance roller 33, and a fixing unit 35. Light 29 is irradiated from the exposure light source 28 to form an electrostatic latent image on the surface of the photoreceptor 27. The exposure light source 28 includes an organic light emitting device according to the present embodiment. The developing unit 31 contains, for example, toner. The charging unit 30 charges the photoreceptor 27. The transferrer 32 transfers the developed image onto a storage medium 34. The conveyance roller 33 conveys the recording medium 34. The recording medium 34 is, for example, paper. The fixing unit 35 fixes the image formed on the recording medium 34.

[0335] Fig. 9B and Fig. 9C Each shows the exposure light source 28 and is a schematic diagram showing a plurality of light emitting portions 36 arranged on a strip-shaped substrate. Each arrow 37 indicates the row direction in which the organic light emitting devices are arranged. The row direction is the same as the direction of the axis around which the photoreceptor 27 rotates. This direction may also be referred to as the major axis direction of the photoreceptor 27. Fig. 9B Shows a configuration in which the light emitting portions 36 are arranged along the major axis direction of the photoreceptor 27. Fig. 9C differs from Fig. 9B in that the light emitting portions 36 are alternately arranged in the row direction in the first and second rows. The first and second rows are located at different positions in the column direction. In the first row, the plurality of light emitting portions 36 are arranged at intervals. The second row has light emitting portions 36 at positions corresponding to the positions between the light emitting portions 36 in the first row. In other words, the plurality of light emitting portions 36 are also arranged at intervals in the column direction. Fig. 9C The arrangement in can be paraphrased as, for example, a lattice arrangement, a staggered arrangement, or a checkered pattern.

[0336] As described above, by using an apparatus including an organic light emitting device according to the present embodiment, stable display can be achieved with good image quality even over a long period of time.

[0337] Example

[0338] Although the present invention will be described below by way of examples, the present invention is not limited thereto.

[0339] [Example 1]

[0340] <Evaluation of HOMO Energy Level and LUMO Energy Level>

[0341] The HOMO energy levels and LUMO energy levels of the first to third organic compounds and the first to third metal complexes were evaluated by the following method. Table 1 gives the results.

[0342] A) Evaluation method of HOMO energy level

[0343] In 5×10 -4 A vapor-deposited film having a thickness of 30 nm was formed on the aluminum substrate under a vacuum of less than 200 Pa. The ionization potential of the vapor-deposited film was measured using AC-3 (manufactured by Riken Keiki Co., Ltd.), and the obtained value was defined as the HOMO level.

[0344] B) Evaluation method of LUMO level

[0345] In 5×10 -4 Pa or less, a vapor-deposited film having a thickness of 30 nm was formed on a quartz substrate, and the optical band gap (absorption edge) of the resulting vapor-deposited film thus formed was determined using a spectrophotometer (V-560, manufactured by JASCO Corporation). The sum of the obtained optical band gap value and the above HOMO energy level was defined as the LUMO energy level.

[0346] [Table 1] Table 1

[0347]

[0348] [Example 2]

[0349] An anode, a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer and a cathode are sequentially formed over a substrate to produce an organic light emitting device having a bottom emission type structure.

[0350] An ITO film was formed on a glass substrate and subjected to desired patterning to form an ITO electrode (anode). At this time, the thickness of the ITO electrode was 100 nm. The substrate on which the ITO electrode was formed in this manner was used as an ITO substrate in the following steps. Next, a 1.33×10 -4 The organic compound layer and the electrode layer shown in Table 2 were sequentially formed on the ITO substrate by vacuum evaporation in a vacuum chamber of 1.50 Pa by resistance heating. Here, the counter electrode (metal electrode layer, cathode) had a spacing of 3 mm. 2 of electrode area.

[0351] [Table 2]

[0352] Table 2

[0353]

[0354] Then, the substrate was transferred into a glove box under a nitrogen atmosphere and sealed with a glass cover containing a desiccant to provide an organic light emitting device.

[0355] The characteristics of the obtained organic light emitting device were measured and evaluated. The emission color of the organic light emitting device was yellow, and the maximum external quantum efficiency (EQE) was 18%.

[0356] At 100mA / cm 2 The device was continuously driven at a current density of . The time when the brightness degradation rate reached 5% was measured. When the time when the brightness degradation rate of Comparative Example 1 reached 5% was defined as 1.0, the brightness degradation ratio of this embodiment was 2.3.

[0357] In the present embodiment, the current-voltage characteristics were measured using a microammeter 4140B manufactured by Hewlett-Packard, and the light emission luminance was measured using a BM7 manufactured by Topcon.

[0358] [Examples 3 to 21 and Comparative Examples 1 to 6]

[0359] The organic light-emitting devices of Examples 3 to 21 and Comparative Examples 1 to 6 were produced in the same manner as in Example 2, except that the compounds were appropriately changed to the compounds given in Table 3-1 and Table 3-2. The characteristics of the obtained organic light-emitting devices were measured and evaluated in the same manner as in Example 2. Table 3-1 and Table 3-2 show the measurement results. The luminance degradation ratio represents a value when the time when the luminance degradation rate of Comparative Example 1 reaches 5% is defined as 1.0.

[0360] When the first light-emitting layer does not include the third metal complex, the weight ratio of the first organic compound to the first metal complex is adjusted to 98:2. When the second light-emitting layer does not include the third organic compound, the weight ratio of the second organic compound to the second metal complex is adjusted to 85:15.

[0361] [Table 3-1]Table 3-1

[0362]

[0363] [Table 3-2]

[0364] Table 3-2

[0365]

[0366] As shown in Table 3-1 and Table 3-2, the EQE values ​​of Comparative Examples 1 to 6 are 18%, 7%, 12%, 16%, 15% and 13%. The brightness degradation ratios of Comparative Examples 1 to 6 are 1.0, 0.3, 0.4, 1.3, 1.1 and 1.4. The device configurations in Comparative Examples 1, 2 and 3 are the same as the device configurations of the organic light-emitting devices described in Patent Documents 1, 2 and 3. In Comparative Example 1, relationship (b) is not satisfied, and therefore the second light-emitting layer is not easy to capture electrons. In Comparative Examples 2 and 4, since the third organic compound is not included, relationship (b) is not satisfied. Therefore, similarly to Comparative Example 1, the second light-emitting layer is not easy to capture electrons. In Comparative Example 3, the third organic compound is a metal complex, and relationship (c) is not satisfied, resulting in insufficient adjustment of the carrier balance in the light-emitting layer. In Comparative Example 5, the third organic compound is an organic compound, but relationship (c) is not satisfied, resulting in insufficient adjustment of the carrier balance in the light-emitting layer. In Comparative Example 6, relations (a) to (c) are not satisfied, thus resulting in insufficient adjustment of carrier balance in the light emitting layer. Due to the above reasons, the organic light emitting devices described in Comparative Examples 1 to 6 are organic light emitting devices having poor durability.

[0367] In contrast, the organic light-emitting device according to the present invention has an excellent brightness degradation ratio. In other words, the organic light-emitting device according to the present invention has excellent durability. This is because the light-emitting layer of the organic light-emitting device according to the present invention captures holes and electrons in a well-balanced manner, making it easy to adjust the carrier balance in the light-emitting layer. In addition, the EQE value of the organic light-emitting device according to the present invention is higher than the EQE value of the organic light-emitting device described in the comparative example. In other words, the organic light-emitting device according to the present invention is an organic light-emitting device that also has excellent luminous efficiency.

[0368] Furthermore, by selecting the first to third metal complexes and the first to third organic compounds suitable for the light-emitting layer of the organic light-emitting device according to the present invention, an organic light-emitting device having excellent light-emitting efficiency and durability can be provided.

[0369] [Example 22]

[0370] An organic light emitting device was produced in the same manner as in Example 2 except that the thickness of the first light emitting layer was changed to 10 nm. The characteristics of the obtained organic light emitting device were measured and evaluated in the same manner as in Example 2. The EQE was 18%, and the luminance degradation ratio was 2.5.

[0371] [Example 23]

[0372] An organic light emitting device was produced in the same manner as in Example 2, except that the thickness of the first light emitting layer was changed to 10 nm and the thickness of the second light emitting layer was changed to 10 nm. The characteristics of the obtained organic light emitting device were measured and evaluated in the same manner as in Example 2. The EQE was 18%, and the luminance degradation ratio was 2.0.

[0373] [Example 24]

[0374] An organic light-emitting device was produced in the same manner as in Example 2, except that the weight ratio in the first light-emitting layer was changed to EM13:AA1:HH1=66:30:4 and the weight ratio in the second light-emitting layer was changed to EM14:EM31:AA2=70:20:10. The characteristics of the obtained organic light-emitting device were measured and evaluated in the same manner as in Example 2. The EQE was 18%, and the luminance degradation ratio was 2.1.

[0375] [Example 25]

[0376] An organic light-emitting device was produced in the same manner as in Example 2, except that the weight ratio in the first light-emitting layer was changed to EM13:AA1:HH1=76:20:4 and the weight ratio in the second light-emitting layer was changed to EM14:EM31:AA2=70:20:30. The characteristics of the obtained organic light-emitting device were measured and evaluated in the same manner as in Example 2. The EQE was 18%, and the luminance degradation ratio was 1.6.

[0377] As described above, by using the organic compound according to the present invention, an organic light emitting device having excellent light emitting efficiency and durability can be provided.

[0378] The present invention may also include the following configurations.

[0379] (Composition 1)

[0380] An organic light emitting device, comprising:

[0381] an anode, a first light-emitting layer, a second light-emitting layer and a cathode,

[0382] wherein the first light-emitting layer and the second light-emitting layer are in contact with each other,

[0383] The first light-emitting layer comprises a first organic compound and a first metal complex,

[0384] The second light-emitting layer comprises a second organic compound, a third organic compound, and a second metal complex, the third organic compound is not a metal complex, and

[0385] The following relations (a) to (c) hold:

[0386] (a) HOMO(D1)>HOMO(H1)

[0387] (b)LUMO(H2)>LUMO(H3)

[0388] (c)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3).

[0389] Here, HOMO(D1), HOMO(H1), LUMO(H2) and LUMO(H3) represent the HOMO energy level of the first metal complex, the HOMO energy level of the first organic compound, the LUMO energy level of the second organic compound and the LUMO energy level of the third organic compound, respectively.

[0390] (Composition 2)

[0391] In the organic light-emitting device described in Configuration 1, the following relationship (d) holds true:

[0392] (d)C2(H3)>C1(D1).

[0393] C1(D1) and C2(H3) represent the concentration of the first metal complex in the first light-emitting layer and the concentration of the third organic compound in the second light-emitting layer, respectively.

[0394] (Composition 3)

[0395] In the organic light-emitting device described in the configuration 1 or 2, the following relationship (n) holds:

[0396] (n)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3)≥0.10eV.

[0397] (Composition 4)

[0398] In the organic light-emitting device described in any one of the configurations 1 to 3, the following relationship (e) holds:

[0399] (e)HOMO(H2)>HOMO(H3).

[0400] Here, HOMO(H2) and HOMO(H3) represent the HOMO energy level of the second organic compound and the HOMO energy level of the third organic compound, respectively.

[0401] (Composition 5)

[0402] In the organic light-emitting device described in any one of the configurations 1 to 4, the following relationship (f) holds:

[0403] (f)LUMO(D2)>LUMO(H3).

[0404] Here, LUMO(D2) represents the LUMO energy level of the second metal complex.

[0405] (Composition 6)

[0406] In the organic light-emitting device described in Configuration 5, the following relationship (g) holds:

[0407] (g)C2(H3)>C2(D2).

[0408] Here, C2(D2) represents the concentration of the second metal complex in the second light-emitting layer.

[0409] (Composition 7)

[0410] In the organic light-emitting device described in any one of configurations 1 to 6, the first light-emitting layer further comprises a third metal complex, and

[0411] At least one ligand included in the third metal complex is the same as the ligand included in the second metal complex.

[0412] (Composition 8)

[0413] In the organic light-emitting device described in Configuration 7, the following relationship (h) holds:

[0414] (h)C1(D3)>C1(D1).

[0415] Here, C1(D3) represents the concentration of the third metal complex in the first light-emitting layer.

[0416] (Composition 9)

[0417] In the organic light-emitting device described in Configuration 7 or 8, the following relations (i) and (j) hold:

[0418] (i)|LUMO(D3)-LUMO(D2)|≤0.2eV

[0419] (j)|HOMO(D3)-HOMO(D2)|≤0.2eV.

[0420] Here, LUMO(D3), HOMO(D3), and HOMO(D2) represent the LUMO energy level of the third metal complex, the HOMO energy level of the third metal complex, and the HOMO energy level of the second metal complex, respectively.

[0421] (Composition 10)

[0422] In the organic light-emitting device described in any one of Configurations 7 to 9, the following relationship (k) holds:

[0423] (k)HOMO(D3)>HOMO(H1).

[0424] (Composition 11)

[0425] In the organic light-emitting device described in any one of Configurations 1 to 10, each of the first metal complex and the second metal complex has a structure represented by any of General Formulas [Ir-1] to [Ir-16].

[0426] [Chemical formula 29]

[0427]

[0428] [Chemical formula 30]

[0429]

[0430] In each of the general formulae [Ir-1] to [Ir-16], Ar1 and Ar2 are each independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group. When there are multiple Ar1 or Ar2, the multiple Ar1 or Ar2 are optionally the same substituent or different substituents. X is selected from an oxygen atom, a sulfur atom, a C( R1)(R2) and NR3, R1 to R3 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group, R1 and R2 are optionally bonded together to form a ring, p1 and p2 are each an integer from 0 to 4, and q is an integer from 1 to 3.

[0431] (Composition 12)

[0432] In the organic light-emitting device described in any one of Configurations 7 to 10, the third metal complex is a metal complex represented by any of General Formulas [Ir-1] to [Ir-16].

[0433] [Chemical formula 31]

[0434]

[0435] [Chemical formula 32]

[0436]

[0437] In each of the general formulae [Ir-1] to [Ir-16], Ar1 and Ar2 are each independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group. When there are multiple Ar1 or Ar2, the multiple Ar1 or Ar2 are optionally the same substituent or different substituents. X is selected from an oxygen atom, a sulfur atom, a C( R1)(R2) and NR3, R1 to R3 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group, R1 and R2 are optionally bonded together to form a ring, p1 and p2 are each an integer from 0 to 4, and q is an integer from 1 to 3.

[0438] (Composition 13)

[0439] In the organic light-emitting device described in configuration 11 or 12, in each of general formulae [Ir-1] to [Ir-16], Ar1 and Ar2 are each an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms.

[0440] (Composition 14)

[0441] In the organic light-emitting device described in any one of Configurations 1 to 13, each of the first organic compound and the second organic compound has any one of a benzothiophene skeleton, a dibenzofuran skeleton, a triphenylene skeleton, and a phenanthrene skeleton.

[0442] (Composition 15)

[0443] In the organic light-emitting device described in any one of Configurations 1 to 14, the third organic compound has an azine skeleton, a xanthone skeleton, or a thioxanthone skeleton.

[0444] (Composition 16)

[0445] In the organic light-emitting device described in any one of Configurations 1 to 15, the light emission wavelength of the first metal complex is longer than the light emission wavelength of the second metal complex.

[0446] (Composition 17)

[0447] In the organic light-emitting device described in any one of Configurations 7 to 16, the second metal complex and the third metal complex are the same compound.

[0448] (Composition 18)

[0449] In the organic light-emitting device described in any one of Configurations 1 to 17, the first organic compound and the second organic compound are the same compound.

[0450] (Composition 19)

[0451] A display device includes a plurality of pixels, at least one of the plurality of pixels includes the organic light emitting device described in any one of items 1 to 18 and a transistor connected to the organic light emitting device.

[0452] (Composition 20)

[0453] An imaging apparatus including an optical section having a lens, an imaging device configured to receive light passing through the optical section, and a display section configured to display an image captured by the imaging device,

[0454] The display unit includes the organic light-emitting device described in any one of Configurations 1 to 18.

[0455] (Composition 21)

[0456] An electronic device includes a display portion having an organic light-emitting device as described in any one of configurations 1 to 18, a housing provided with the display portion, and a communication portion provided in the housing and configured to communicate with the outside.

[0457] (Composition 22)

[0458] A lighting device includes a light source having the organic light emitting device described in any one of configurations 1 to 18 and a light diffusion portion or an optical film configured to transmit light emitted from the light source.

[0459] (Composition 23)

[0460] A mobile object comprises a lamp having an organic light emitting device as described in any one of items 1 to 18 and a body provided with the lamp.

[0461] (Composition 24)

[0462] An image forming apparatus includes a photoreceptor and an exposure light source configured to expose the photoreceptor.

[0463] The exposure light source includes an organic light-emitting device described in any one of Constructions 1 to 18.

[0464] The present invention is not limited to the above-described embodiments and various changes and modifications can be made within the spirit and scope of the present invention. Therefore, in order to make the public aware of the scope of the present invention, the following claims are attached.

[0465] This application claims priority based on Japanese Patent Application No. 2022-132554 filed on August 23, 2022 and Japanese Patent Application No. 2023-124957 filed on July 31, 2023, which are incorporated herein by reference in their entirety.

[0466] Description of Reference Numerals

[0467] 1 Insulation layer

[0468] 2 Anode

[0469] 3. Hole transport layer

[0470] 4a The first light-emitting layer

[0471] 4b Second light-emitting layer

[0472] 5Electron transport layer

[0473] 6 cathode

Claims

1. An organic light-emitting device, comprising: an anode, a first light-emitting layer, a second light-emitting layer and a cathode, wherein the first light-emitting layer and the second light-emitting layer are in contact with each other, The first light-emitting layer comprises a first organic compound and a first metal complex, The second light-emitting layer comprises a second organic compound, a third organic compound and a second metal complex, The third organic compound is not a metal complex, and The following relations (a) to (c) hold: (a) HOMO(D1)>HOMO(H1) (b)LUMO(H2)>LUMO(H3) (c)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3) Wherein HOMO(D1), HOMO(H1), LUMO(H2) and LUMO(H3) respectively represent the HOMO energy level of the first metal complex, the HOMO energy level of the first organic compound, the LUMO energy level of the second organic compound and the LUMO energy level of the third organic compound.

2. The organic light emitting device according to claim 1, wherein the following relationship (d) holds: (d) C2(H3)>C1(D1) Wherein C1(D1) and C2(H3) represent the concentration of the first metal complex in the first light-emitting layer and the concentration of the third organic compound in the second light-emitting layer, respectively.

3. The organic light emitting device according to claim 1, wherein the following relationship (n) holds: (n)HOMO(D1)-HOMO(H1)>LUMO(H2)-LUMO(H3)≥0.10eV.

4. The organic light emitting device according to claim 1, wherein the following relationship (e) holds: (e) HOMO(H2)>HOMO(H3) Wherein HOMO(H2) and HOMO(H3) represent the HOMO energy level of the second organic compound and the HOMO energy level of the third organic compound, respectively.

5. The organic light emitting device according to claim 1, wherein the following relationship (f) holds: (f)LUMO(D2)>LUMO(H3) wherein LUMO(D2) represents the LUMO energy level of the second metal complex.

6. The organic light emitting device according to claim 5, wherein the following relationship (g) holds: (g)C2(H3)>C2(D2) Wherein C2(D2) represents the concentration of the second metal complex in the second light-emitting layer.

7. The organic light-emitting device according to claim 1, wherein the first light-emitting layer further comprises a third metal complex, and At least one ligand included in the third metal complex is the same as the ligand included in the second metal complex.

8. The organic light emitting device according to claim 7, wherein the following relationship (h) holds: (h)C1(D3)>C1(D1) Wherein C1(D3) represents the concentration of the third metal complex in the first light-emitting layer.

9. The organic light emitting device according to claim 7, wherein the following relations (i) and (j) hold: (i)|LUMO(D3)-LUMO(D2)|≤0.2eV (j)|HOMO(D3)-HOMO(D2)|≤0.2eV Wherein LUMO(D3), HOMO(D3) and HOMO(D2) represent the LUMO energy level of the third metal complex, the HOMO energy level of the third metal complex and the HOMO energy level of the second metal complex, respectively.

10. The organic light emitting device according to claim 7, wherein the following relationship (k) holds: (k)HOMO(D3)>HOMO(H1).

11. The organic light-emitting device according to claim 1, wherein each of the first metal complex and the second metal complex has a structure represented by any of the general formulas [Ir-1] to [Ir-16]: in, In each of the general formulae [Ir-1] to [Ir-16], Ar1 and Ar2 are each independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group. When there are multiple Ar1 or Ar2, the multiple Ar1 or Ar2 are optionally the same substituent or different substituents. X is selected from an oxygen atom, a sulfur atom, a C( R1)(R2) and NR3, R1 to R3 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group, R1 and R2 are optionally bonded together to form a ring, p1 and p2 are each an integer from 0 to 4, and q is an integer from 1 to 3.

12. The organic light-emitting device according to claim 7, wherein the third metal complex is a metal complex represented by any of the general formulas [Ir-1] to [Ir-16]: in, In each of the general formulae [Ir-1] to [Ir-16], Ar1 and Ar2 are each independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group. When there are multiple Ar1 or Ar2, the multiple Ar1 or Ar2 are optionally the same substituent or different substituents. X is selected from an oxygen atom, a sulfur atom, a C( R1)(R2) and NR3, R1 to R3 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted silyl group and a cyano group, R1 and R2 are optionally bonded together to form a ring, p1 and p2 are each an integer from 0 to 4, and q is an integer from 1 to 3. 13 . The organic light-emitting device according to claim 11 , wherein in each of the general formulae [Ir-1] to [Ir-16], Ar1 and Ar2 are each an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms. 14 . The organic light-emitting device according to claim 12 , wherein in each of the general formulae [Ir-1] to [Ir-16], Ar1 and Ar2 are each an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 10 carbon atoms. 15 . The organic light emitting device according to claim 1 , wherein each of the first organic compound and the second organic compound has any one of a benzothiophene skeleton, a dibenzofuran skeleton, a triphenylene skeleton, and a phenanthrene skeleton. 16 . The organic light emitting device according to claim 1 , wherein the third organic compound has an azine skeleton, a xanthone skeleton, or a thioxanthone skeleton. 17 . The organic light emitting device according to claim 1 , wherein the light emission wavelength of the first metal complex is longer than the light emission wavelength of the second metal complex.

18. The organic light emitting device according to claim 7, wherein the second metal complex and the third metal complex are the same compound.

19. The organic light emitting device according to claim 1, wherein the first organic compound and the second organic compound are the same compound. 20 . A display device comprising a plurality of pixels, at least one of the plurality of pixels comprising the organic light emitting device according to any one of claims 1 to 19 and a transistor connected to the organic light emitting device.

21. An imaging apparatus comprising an optical section having a lens, an imaging device configured to receive light passing through the optical section, and a display section configured to display an image captured by the imaging device, The display portion includes the organic light-emitting device according to any one of claims 1 to 19. 22 . An electronic device comprising a display portion having the organic light-emitting device according to claim 1 , a housing provided with the display portion, and a communication portion provided in the housing and configured to communicate with the outside. 23 . A lighting device comprising a light source having the organic light emitting device according to claim 1 , and a light diffusion portion or an optical film configured to transmit light emitted from the light source.

24. A mobile object comprising a lamp having the organic light emitting device according to any one of claims 1 to 19 and a body provided with the lamp.

25. An image forming apparatus comprising a photoreceptor and an exposure light source configured to expose the photoreceptor, The exposure light source comprises the organic light emitting device according to any one of claims 1 to 19.

Images