Organic light emitting element and display device using the same

Abstract

To provide an organic light emitting element having excellent element durability.SOLUTION: There is provided an organic light emitting element including a first electrode, a second electrode and an organic compound layer that is arranged between the first electrode and the second electrode. The organic light emitting element is characterized in that: the organic compound layer includes a light emitting layer; the light emitting layer contains at least a first organic compound, a second organic compound, and a luminescent compound that produces phosphorescence; the lowest excited triplet energy of the first organic compound and the lowest excited triplet energy of the second organic compound are higher than the lowest excited triplet energy of the luminescent compound; and with respect to the first organic compound and the second organic compound, all of freely rotatable single bonds are carbon-carbon bonds, and a relationship of a formula (1) is satisfied. |HOMO(H2)|>|HOMO(H1)| (1).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an organic light-emitting element and a display device using the same. [Background technology]

[0002] An organic electroluminescence element (hereinafter sometimes referred to as an "organic light-emitting element" or "organic EL element") is an electronic element having a pair of electrodes and an organic compound layer disposed between the electrodes. By injecting electrons and holes from the pair of electrodes, excitons of a light-emitting organic compound in the organic compound layer are generated, and when the excitons return to the ground state, the organic light-emitting element emits light.

[0003] Recent progress in organic light-emitting devices has been remarkable, enabling low driving voltages, diverse emission wavelengths, high-speed response, and thin, lightweight light-emitting devices.

[0004] It is known that materials such as phosphorescent materials and delayed fluorescent materials are used to improve the efficiency of organic light-emitting devices. In any of these materials, the light-emitting mechanism is via a triplet excited state, and it is known that the material is deteriorated due to the energy transition from the triplet excited state to a higher excited state. In organic light-emitting devices using materials that utilize the triplet state, there is a demand for improvement in the element durability of the organic light-emitting devices.

[0005] Patent Document 1 describes a ternary fluorescent light-emitting layer containing two light-emitting materials with different HOMO and LUMO levels relative to an emission layer host as a configuration for improving device durability. Patent Documents 2 and 3 describe the use of organic compound 1-a and organic compound 2-a having nitrogen-containing condensed ring skeletons as highly stable materials to improve device durability. [ka] [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2011-71194 A [Patent Document 2] International Publication No. 2012 / 077582 [Patent Document 3] JP 2012-72099 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the configuration of the light-emitting layer described in Patent Document 1 is a light-emitting layer that emits fluorescence, and no organic light-emitting device utilizing a triplet state is disclosed. Moreover, the light-emitting layer configurations described in Patent Documents 2 and 3 are not preferable because they provide insufficient element durability.

[0008] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide an organic light-emitting element having excellent element durability. [Means for solving the problem]

[0009] The organic light-emitting device according to the present invention is an organic light-emitting device having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, the organic compound layer having an emitting layer, the emitting layer having at least a first organic compound, a second organic compound, and a light-emitting compound that emits phosphorescence, the lowest excited triplet energies of the first organic compound and the second organic compound are higher than the lowest excited triplet energy of the light-emitting compound, and all of the freely rotatable single bonds of the first organic compound are carbon-carbon bonds, satisfying the relationship of formula (1). |HOMO(H2)|>|HOMO(H1)| (1) Effect of the Invention

[0010] According to the present invention, it is possible to provide an organic light-emitting element having excellent element durability. [Brief description of the drawings]

[0011] [Figure 1] 1A is a schematic cross-sectional view showing an example of a pixel of a display device according to one embodiment of the present invention, and FIG. 1B is a schematic cross-sectional view showing an example of a display device using an organic light-emitting element according to one embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic diagram illustrating an example of a display device according to an embodiment of the present invention. [Diagram 3] 1A is a schematic diagram illustrating an example of an imaging device according to an embodiment of the present invention, and FIG. 1B is a schematic diagram illustrating an example of an electronic device according to an embodiment of the present invention. [Figure 4] 1A is a schematic diagram illustrating an example of a display device according to an embodiment of the present invention, and FIG. 1B is a schematic diagram illustrating an example of a foldable display device. [Diagram 5] 1A is a schematic diagram showing an example of an illumination device according to an embodiment of the present invention, and FIG. 1B is a schematic diagram showing an example of an automobile having a vehicle lamp according to an embodiment of the present invention. [Figure 6] 1A is a schematic diagram showing an example of a wearable device according to an embodiment of the present invention, and FIG. 1B is a schematic diagram showing an example of a wearable device according to an embodiment of the present invention, the wearable device having an imaging device. [Figure 7] 1A is a schematic diagram showing an example of an image forming apparatus according to an embodiment of the present invention, FIG. 1B is a schematic diagram showing an example of an exposure light source of the image forming apparatus according to an embodiment of the present invention, and FIG. 1C is a schematic diagram showing an example of an exposure light source of the image forming apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] In the present specification, examples of halogen atoms include, but are not limited to, fluorine, chlorine, bromine, iodine, etc. Among these, a fluorine atom is preferred.

[0013] The alkyl group may be an alkyl group having from 1 to 20 carbon atoms. Examples of the alkyl group include, but are not limited to, a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, a tertiary butyl group, a secondary butyl group, an octyl group, a cyclohexyl group, a 1-adamantyl group, and a 2-adamantyl group.

[0014] The alkoxy group may be an alkoxy group having from 1 to 10 carbon atoms. Examples include, but are not limited to, a methoxy group, an ethoxy group, a propoxy group, a 2-ethyl-octyloxy group, and a benzyloxy group.

[0015] Examples of the silyl group include, but are not limited to, a trimethylsilyl group and a triphenylsilyl group.

[0016] The aryl group may be an aryl group having a carbon number of 6 to 20. Examples of the aryl group 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 phenanthryl group, a fluoranthenyl group, and a triphenylenyl group.

[0017] The heteroaryl group may be a heteroaryl group having from 3 to 20 carbon atoms. Examples of the heteroaryl group include, but are not limited to, a pyridyl group, a pyrimidyl group, a pyrazyl group, a triazolyl group, an oxazolyl group, an oxadiazolyl group, a thiazolyl group, a thiadiazolyl group, a carbazolyl group, an acridinyl group, a phenanthrolyl group, a dibenzofuranyl group, and a dibenzothiophenyl group.

[0018] Examples of the amino group include, but are not limited to, an N-methylamino group, an N-ethylamino group, an N,N-dimethylamino group, an N,N-diethylamino group, an N-methyl-N-ethylamino group, an N-benzylamino group, an N-methyl-N-benzylamino group, an N,N-dibenzylamino group, an anilino group, an N,N-diphenylamino group, an N,N-dinaphthylamino group, an N,N-difluorenylamino group, an N-phenyl-N-tolylamino group, an N,N-ditolylamino group, an N-methyl-N-phenylamino group, an N,N-dianisolylamino group, an N-mesityl-N-phenylamino group, an N,N-dimesitylamino group, an N-phenyl-N-(4-tert-butylphenyl)amino group, an N-phenyl-N-(4-trifluoromethylphenyl)amino group, an N-piperidyl group, and a carbazolyl group.

[0019] Examples of the aryloxy group and heteroaryloxy group include, but are not limited to, a phenoxy group and a thienyloxy group.

[0020] Examples of substituents that may be further possessed by the alkyl group, alkoxy group, silyl group, aryl group, heteroaryl group, amino group, aryloxy group, and heteroaryloxy group include, but are not limited to, a deuterium atom; halogen atoms such as fluorine, chlorine, bromine, and iodine; alkyl groups such as a methyl group, an ethyl group, a normal propyl group, an isopropyl group, a normal butyl group, and a tertiary butyl group; alkoxy groups such as a methoxy group, an ethoxy group, and a propoxy group; amino groups such as a dimethylamino group, a diethylamino group, a dibenzylamino group, a diphenylamino group, and a ditolylamino group; aryloxy groups such as a phenoxy group; aromatic hydrocarbon groups such as a phenyl group and a biphenyl group; heteroaryl groups such as a pyridyl group and a pyrrolyl group; a cyano group, a hydroxy group, and a thiol group.

[0021] In this specification, HOMO(H1), HOMO(H2), and HOMO(D) respectively represent the HOMO level of the first organic compound, the HOMO level of the second organic compound, and the HOMO level of the light-emitting compound. LUMO(H1), LUMO(H2), and LUMO(D) respectively represent the LUMO level of the first organic compound, the LUMO level of the second organic compound, and the LUMO level of the light-emitting compound. In addition, for example, when written as |HOMO(H1)|, it represents the absolute value of the HOMO level of the first organic compound.

[0022] (1) Organic light-emitting element The organic light-emitting device according to the present invention is an organic light-emitting device having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, the organic compound layer having an emitting layer, the emitting layer having at least a first organic compound, a second organic compound, and a light-emitting compound that emits phosphorescence, the lowest excited triplet energies of the first organic compound and the second organic compound are higher than the lowest excited triplet energy of the light-emitting compound, and all of the freely rotatable single bonds of the first organic compound are carbon-carbon bonds, satisfying the relationship of formula (1). |HOMO(H2)|>|HOMO(H1)| (1) The light-emitting layer of the organic light-emitting device according to the present invention has the following structure.

[0023] (1-1) The light-emitting layer has at least a first organic compound, a second organic compound, and a light-emitting compound. (1-2) The lowest excited triplet energy of the first organic compound and the second organic compound is higher than the lowest excited triplet energy of the light-emitting compound. (1-3) In the first organic compound, all of the freely rotatable single bonds are carbon-carbon bonds. (1-4) The first organic compound and the second organic compound satisfy |HOMO(H2)|>|HOMO(H1)|. These configurations will be described below.

[0024] (1-1) The light-emitting layer has at least a first organic compound, a second organic compound, and a light-emitting compound.

[0025] The organic light-emitting device according to the present invention has at least a first organic compound, a second organic compound, and a light-emitting compound in the light-emitting layer. Here, the effect of having the first organic compound and the second organic compound in the light-emitting layer will be described with reference to Table 1.

[0026] The configuration of the light-emitting layer and the element durability are shown in Table 1. The element durability is a value when the element durability of Comparative Example B is set to 1.0. [Table 1] In Table 1, Comparative Examples A to C all have device configurations in which the absolute value of the LUMO level of the light-emitting compound is the smallest. Since electrons are easily trapped in compounds with small absolute values ​​of the LUMO level, electrons are easily trapped in the light-emitting compound in the device configurations of Comparative Examples A to C. As will be described in detail later, when the light-emitting compound is prone to trap electrons or holes, exciton generation is likely to concentrate on the light-emitting compound, and the durability of the device is likely to decrease.

[0027] In addition, Comparative Example D has a device configuration in which the absolute value of the LUMO level of the first organic compound is the largest, but the device durability is low. When the absolute value of the LUMO level of an organic compound is large, the absolute value of the HOMO level also tends to be large, so the absolute value of the HOMO level of the first organic compound is large. Holes are easily trapped in compounds with small absolute values ​​of HOMO levels, but in the device configuration of Comparative Example D, the absolute value of the HOMO level of the first organic compound is large, so holes are difficult to inject into the light-emitting layer. Therefore, the carrier balance between electrons and holes in the light-emitting layer is lost, and the device durability is reduced by the carriers remaining in the light-emitting layer.

[0028] On the other hand, in the present invention A, the absolute value of the LUMO level of the second organic compound is the largest, so that electrons are less likely to be trapped in the light-emitting compound. In addition, the absolute value of the LUMO level of the first organic compound is the smallest, so that the absolute value of the HOMO level of the first organic compound is also low. Therefore, holes are easily injected into the light-emitting layer. Therefore, by having the first organic compound and the second organic compound in the light-emitting layer, the carrier balance of electrons and holes can be adjusted, so that the durability of the element is improved. In addition, the HOMO level and LUMO level of the organic compounds listed in Table 1 are listed in the examples.

[0029] (1-2) The lowest excited triplet energy of the first organic compound and the second organic compound is higher than the lowest excited triplet energy of the light-emitting compound.

[0030] In order to improve the luminous efficiency of an organic light-emitting device, it is necessary to efficiently use the lowest excited triplet energy (T1) of the light-emitting compound for luminescence. To achieve this, it is necessary for the light-emitting compound to have the lowest T1 in the light-emitting layer. In the organic light-emitting device according to the present invention, the T1 of the first organic compound and the T1 of the second organic compound are higher than the T1 of the light-emitting compound. In other words, the T1 of the light-emitting compound is lower than the T1 of the first organic compound and the second organic compound.

[0031] The configuration of the light-emitting layer and the external quantum efficiency (EQE) are shown in Table 2. Comparative Example a is an organic light-emitting device described in Patent Document 1. [Table 2] In Comparative Example E, the luminescent compound is a luminescent compound that emits fluorescence, and most of T1 is lost as thermal deactivation, so the EQE is low. In Comparative Example F, the luminescent compound is a luminescent compound that emits phosphorescence, and the T1 is higher than the T1 of the first organic compound and the second organic compound. In the organic light-emitting device of Comparative Example F, the T1 of the luminescent compound is not the lowest, so the T1 of the luminescent compound cannot be used efficiently. Therefore, the EQE is low.

[0032] On the other hand, in the present invention B, which is one embodiment of the present invention, the luminescent compound is a luminescent compound that emits phosphorescence, and its T1 is lower than the T1 of the first organic compound and the second organic compound. Therefore, the T1 of the luminescent compound can be efficiently used for luminescence, and the EQE is high. Therefore, the organic light-emitting device according to the present invention is an organic light-emitting device having high luminous efficiency because the T1 of the luminescent compound is lower than the T1 of the first organic compound and the second organic compound.

[0033] (1-3) In the first organic compound, all of the freely rotatable single bonds are carbon-carbon bonds.

[0034] In this specification, the first organic compound is responsible for most of the exciton generation in the organic light-emitting element. Therefore, the first organic compound is required to have a skeleton that is difficult to decompose even in a high-energy excited state. Here, the skeleton that is difficult to decompose refers to a skeleton in which a freely rotatable single bond has a high bond energy. In this specification, the freely rotatable single bond refers to a bond in which unit A and unit B are not condensed when a single bond between unit A and unit B is represented as "AB". Units A and B may be atoms such as carbon atoms and nitrogen atoms, or molecules such as benzene and carbazole. Table 3 shows the bond energy of each bond. [Table 3] The bond energy of F1 and F2 having carbon-nitrogen bonds is 3.9 eV. On the other hand, the bond energy of F4 having a freely rotatable carbon-carbon bond is 4.5 eV, and the bond energy of F3 having a freely rotatable sp2 carbon bond is 5.0 eV. Therefore, when all the freely rotatable single bonds are carbon-carbon bonds, it is preferable because it is a skeleton that is difficult to decompose. Among carbon-carbon bonds, the bond between sp2 carbons has a particularly high bond energy, so a skeleton in which all the freely rotatable single bonds are bonds between sp2 carbons is more difficult to decompose, and is even more preferable.

[0035] In addition, in the organic light-emitting device according to the present invention, recombination of electrons and holes occurs not only on the first organic compound but also on the second organic compound. Therefore, it is preferable that all the freely rotatable single bonds in the second organic compound as well as the first organic compound are carbon-carbon bonds. From the viewpoint of bond stability, it is more preferable that all the freely rotatable single bonds are bonds between sp2 carbons.

[0036] Table 4 shows a comparison of the element durability of organic light-emitting devices for first organic compounds having different skeletons. [Table 4] In Comparative Example G, the first organic compound has inferior device durability compared to the present invention, since some of the freely rotatable single bonds are carbon-nitrogen bonds with low bond energy. On the other hand, in the present inventions C and D, the first organic compound has excellent device durability, since the freely rotatable single bonds are carbon-carbon bonds with high bond energy. In particular, the present invention C, in which the freely rotatable single bonds are bonds between sp2 carbons with higher bond energy, showed better device durability. Therefore, the organic light-emitting device according to the present invention is an organic light-emitting device with excellent device durability, since all of the freely rotatable single bonds in the first organic compound are carbon-carbon bonds.

[0037] (1-4) The first organic compound and the second organic compound satisfy |HOMO(H2)|>|HOMO(H1)|.

[0038] In the organic light-emitting device according to the present invention, the first organic compound is mainly responsible for hole transport, and therefore, the first organic compound is required to have a higher hole injection property than the second organic compound. Therefore, the organic light-emitting device according to the present invention needs to satisfy the relationship of formula (1). |HOMO(H2)|>|HOMO(H1)| (1) When the absolute value of the HOMO level of the first organic compound is smaller than the absolute value of the HOMO level of the second organic compound, it is expected that the hole injection property into the first organic compound is improved.

[0039] In addition, in the organic light-emitting device according to the present invention, the second organic compound is mainly responsible for electron transport. Examples of electron-transporting skeletons include azine derivatives and ketone derivatives, but these skeletons are not suitable for hole transport because they are poorly stable in the radical cation state. Therefore, it is preferable that holes can be efficiently injected from the second organic compound to the first organic compound. From the above viewpoint, it is also preferable that formula (1) is satisfied.

[0040] The organic light-emitting device according to the present invention preferably further has the following configurations. Only one of the following configurations may be satisfied, or a plurality of the following configurations may be satisfied.

[0041] (1-5) At least one of formula (2) or (3) is satisfied. |LUMO(H2)|>|LUMO(D)| (2) |HOMO(D)|>|HOMO(H1)| (3)

[0042] (1-6) Satisfy equations (2) and (4). |LUMO(H2)|>|LUMO(D)| (2) |LUMO(H1)|>|LUMO(D)| (4)

[0043] (1-7) Equations (3) to (5) are satisfied. |HOMO(D)|>|HOMO(H1)| (3) |LUMO(H1)|>|LUMO(D)| (4) |LUMO(H1)|>|LUMO(H2)| (5) These will be explained below.

[0044] (1-5) At least one of formula (2) or formula (3) is satisfied. |LUMO(H2)|>|LUMO(D)| (2) |HOMO(D)|>|HOMO(H1)| (3) In the organic light-emitting device according to the present invention, it is preferable that electrons and holes are not easily concentrated on the light-emitting compound. In other words, it is preferable that exciton generation is not easily concentrated on the light-emitting compound. This is because the generation of excitons is concentrated on the light-emitting compound, which may cause the light-emitting compound to transition to a higher energy state. As a result, the bond of the light-emitting compound is cleaved, and the concentration of the light-emitting compound in the light-emitting layer decreases, causing luminance deterioration. Therefore, it is preferable to satisfy at least one of formulas (2) and (3). By satisfying one of them, electrons and holes are not easily trapped simultaneously on the light-emitting compound, so exciton generation is not easily concentrated. Therefore, the element durability of the organic light-emitting device is superior.

[0045] It is more preferable that formulas (2) and (3) are satisfied simultaneously. By simultaneously satisfying formulas (2) and (3), electrons and holes are less likely to concentrate on the light-emitting compound, which is more preferable from the viewpoint of element durability of the organic light-emitting element.

[0046] Tables 5 to 7 show the configurations of the organic light-emitting devices according to the present invention and the relative values ​​of the element durability. In Table 5, the element durability of Invention E is a value when the element durability of Invention F is set to 1.0. In Table 6, the element durability of Invention G is a value when the element durability of Invention H is set to 1.0. In Table 7, the element durability of Comparative Example H is a value when the element durability of Comparative Example I is set to 1.0. [Table 5] [Table 6] [Table 7] In Tables 5 and 6, the present inventions E and G have a configuration that satisfies formulas (2) and (3). On the other hand, the present inventions F and H have a configuration that satisfies only formula (2). Although high element durability can be obtained even with a configuration that satisfies only formula (2), the element durability was further improved when the configuration satisfied formulas (2) and (3). As described above, this is because electrons and holes are less likely to concentrate on the light-emitting compound, and therefore deterioration of the light-emitting compound can be suppressed.

[0047] Furthermore, in Tables 5 and 6, focusing on Inventions E and G, the element durability of Invention E in which all of the freely rotatable single bonds of the first organic compound are bonds between sp2 carbons was 1.2, which was a better value than Invention G. Therefore, the effect of Structure (1-4) is greater as the skeleton of the first organic compound has higher bond stability.

[0048] In addition, in Table 7, Comparative Example H satisfies formulas (2) and (3), and Comparative Example I satisfies only formula (2). However, since the freely rotatable single bond of the first organic compound has a carbon-nitrogen bond, the bond stability is low and improvement in device durability could not be confirmed. Therefore, the improvement effect of device durability by this configuration can be sufficiently obtained in an organic light-emitting device composed of an organic compound in which all the freely rotatable single bonds are carbon-carbon bonds.

[0049] (1-6) Satisfy equations (2) and (4). |LUMO(H2)|>|LUMO(D)| (2) |LUMO(H1)|>|LUMO(D)| (4) In the organic light-emitting device according to the present invention, it is preferable that the absolute value of the LUMO level of the light-emitting compound is the lowest. This is because the above-mentioned configuration makes it more difficult for electrons to be trapped on the light-emitting compound. As a result, it is possible to suppress the generation of excitons on the light-emitting compound, and thus the durability of the device is further improved.

[0050] The configuration and element durability of each organic light-emitting device are shown in Table 8. Invention I is configured such that the compound having the smallest absolute value of the LUMO level is the light-emitting compound. Invention J is configured such that the compound having the smallest absolute value of the LUMO level is the first organic compound. [Table 8] As shown in Table 8, the element durability of the present invention I was superior to that of the present invention J. This is because the compound having the smallest absolute value of the LUMO level in the present invention configuration I is a light-emitting compound, and therefore it is possible to suppress exciton generation on the light-emitting compound.

[0051] (1-7) Equations (3) to (5) are satisfied. |HOMO(D)|>|HOMO(H1)| (3) |LUMO(H1)|>|LUMO(D)| (4) |LUMO(H1)|>|LUMO(H2)| (5) In the organic light-emitting device according to the present invention, it is preferable that exciton generation is concentrated on the first organic compound. In other words, it is preferable that the absolute value of the HOMO level of the first organic compound is the smallest, and the absolute value of the LUMO level of the first organic compound is the largest. This is because the above-mentioned configuration allows the recombination of electrons and holes to be performed more efficiently on the first organic compound. In addition, the consumption rate of excitons can be improved, and therefore the effect of suppressing the deactivation of excitons can be obtained.

[0052] Table 9 shows the configuration and element durability of each organic light-emitting device. The present invention K is a configuration in which the absolute value of the HOMO level of the first organic compound is the smallest and the absolute value of the LUMO level of the first organic compound is the largest. The present invention configuration L is a configuration in which the absolute value of the HOMO level of the light-emitting compound is the smallest and the absolute value of the LUMO level of the first organic compound is the largest. [Table 9] As shown in Table 9, the element durability of Invention K was superior to that of Invention L. This is because Invention K has a configuration in which the absolute value of the HOMO level of the first organic compound is the smallest and the absolute value of the LUMO level of the first organic compound is the largest, and therefore exciton generation occurs intensively on the first organic compound.

[0053] (2) First organic compound In the organic light-emitting device according to the present invention, all of the freely rotatable single bonds in the first organic compound are carbon-carbon bonds. Preferably, all of the freely rotatable single bonds are formed from bonds between sp2 carbon atoms.

[0054] As described in (1-2), in the light-emitting layer of the organic light-emitting device according to the present invention, T1 of the first organic compound and the second organic compound is higher than T1 of the light-emitting compound. The organic compound has a large band gap because the lowest excited singlet energy (S1) is higher than T1. In other words, the difference between the HOMO level and the LUMO level of the first organic compound and the second organic compound is large. Therefore, electrons or holes are easily trapped on the light-emitting compound. As a result, the generation of excitons is concentrated on the light-emitting compound, which leads to deterioration of the light-emitting compound. Therefore, it is preferable that the first organic compound has hole transport properties. By using an organic compound that exhibits hole transport properties as the first organic compound, it is possible to suppress the generation of excitons from being concentrated on the light-emitting compound. In this specification, hole transport properties refer to the ability of holes to move. More preferably, the mobility of holes is larger than that of electrons. Specifically, it is preferable that the first organic compound has a skeleton of general formula (1-1) or (1-2). [ka] In the general formulas (1-1) and (1-2), the cyclic units A to C are each independently selected from a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group. Q1 to Q3 are each a direct bond, C(R A )(R B ), N(R C), an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom. R A ~R C 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 aryl group, and a substituted or unsubstituted heteroaryl group. C forms a ring with the adjacent cyclic units A to C.

[0055] Specific examples of the skeletons of the general formulae (1-1) and (1-2) are shown below, but the skeletons are not limited thereto. [ka] The general formulae (1-1) and (1-2) may have an aryl group or a heteroaryl group through a direct bond or a phenyl group. The phenyl group may be singular or plural, and may be bonded at the meta or para position, preferably at the meta position. The aryl group or the heteroaryl group bonded through the phenyl group may further have a substituent, and the substituent may be an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms. Specifically, the substituent may be a methyl group, a tert-butyl group, a phenyl group, or a biphenyl group.

[0056] Specific examples of the first organic compound are shown below, however, the present invention is not limited thereto. [ka] [ka] [ka] [ka] [ka]

[0057] (3) Second organic compound In the organic light-emitting device according to the present invention, all of the freely rotatable single bonds in the second organic compound are carbon-carbon bonds. Preferably, all of the freely rotatable single bonds are formed of bonds between sp2 carbons. In addition, in order to further suppress the generation of excitons on the light-emitting compound, it is preferable to use an organic compound with electron transport properties as the second organic compound. This is because such a configuration can further suppress the generation of excitons on the light-emitting compound. In this specification, electron transport properties refer to the ability to move electrons. More preferably, the mobility of electrons is greater than that of holes. Specifically, it is preferable that the first organic compound has a skeleton of any of the general formulas (2-1) to (2-7). [ka] In the general formulas (2-1) and (2-2), the cyclic units D to F are each independently selected from a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group. Q4 is a direct bond, C(R D )(R E ), an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom. R D and R E 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 aryl group, and a substituted or unsubstituted heteroaryl group. n is an integer of 1 to 5.

[0058] In the general formulas (2-3) to (2-7), R to R 20 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group. 20 Among these, adjacent substituents may be bonded to each other to form a condensed ring.

[0059] Specific examples of the skeletons of the general formulae (2-1) to (2-7) are shown below, but the skeletons are not limited thereto. [ka] The general formulae (2-1) to (2-7) may have an aryl group or a heteroaryl group via a phenyl group or a pyridyl group. The phenyl group or the pyridyl group may be singular or plural, and may be bonded at the meta or para position, and is preferably bonded at the meta position. The aryl group or the heteroaryl group bonded via the phenyl group or the pyridyl group may further have a substituent, and the substituent may be an aryl group having 6 to 12 carbon atoms. Specifically, it may be a phenyl group or a biphenyl group.

[0060] Specific examples of the second organic compound are shown below, however, the present invention is not limited thereto. [ka] [ka] [ka]

[0061] (4) Luminescent compounds The luminescent compound is not particularly limited as long as it is a compound that mainly emits phosphorescence, but is preferably an organometallic complex represented by the general formula (3). M(L)m(L')n(L'')p (3)

[0062] In general formula (3), M represents a metal atom. Specifically, it is an iridium atom or a platinum atom, and preferably an iridium atom. L, L', and L'' each represent a different bidentate ligand. m is selected from an integer of 1 or more and 3 or less. n and p are selected from an integer of 0 or more and 2 or less, with the proviso that m+n+p=3. When m is 2 or more, L's may be the same or different. When n is 2 or more, L's may be the same or different. When p is 2 or more, L''s may be the same or different.

[0063] M(L)m is represented by general formula (4-1). [ka] In the general formula (4-1), Z1 to Z4 are each independently selected from C(R 21 ), and a nitrogen atom. R 21 ~R 28 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 silyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, or a cyano group, provided that R 21 ~R 28 At least one of Z1 to Z4 is selected from a substituted or unsubstituted aryl group and a substituted or unsubstituted heteroaryl group. 21 ), R 21 may be the same as or different from each other.

[0064] In addition, adjacent R 21 ~R 28 may be bonded to each other to form a ring.

[0065] M(L')n is represented by general formula (4-2). [ka] In formula (4-2), Z5 to Z8 are each independently selected from C(R 35 ), and a nitrogen atom. R 31 ~R 35 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 silyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, or a cyano group. 35 ), R 35 may be the same as or different from each other.

[0066] In addition, adjacent R 31 ~R 35 may be bonded to each other to form a ring.

[0067] M(L″)p is represented by general formula (4-3). [ka] In formula (4-3), R 39 ~R 41 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 silyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, or a cyano group.

[0068] Specific examples of the partial structure M(L)m of the organometallic complex, which is a luminescent compound, are shown below, but are not limited thereto. In the specific examples shown below, coordinate bonds are shown by straight lines, dotted lines, or arrows. [ka] [ka] [ka] In the general formulae [Ir-5] to [Ir-8], [Ir-15], and [Ir-16], X' is selected from an oxygen atom, a sulfur atom, a substituted or unsubstituted carbon atom, and a substituted or unsubstituted nitrogen atom.

[0069] In the general formulas [Ir-1] to [Ir-20], adjacent R 21 ~R 29 may be bonded to each other to form a ring.

[0070] In the light-emitting compound according to the present invention, the partial structure M(L)m preferably has three or more condensed rings. This is because the condensed rings of three or more rings improve the planarity of the molecule, promote the energy transfer from the first organic compound or the second organic compound to the phosphorescent material, and lead to improved luminous efficiency and device durability. Examples of the condensed rings of three or more rings include the general formulas [Ir-3] to [Ir-8] and [Ir-11] to [Ir-16]. Specific examples include a phenanthrene ring, a triphenylene ring, a benzofluorene ring, a dibenzofuran ring, a dibenzothiophene ring, a benzonaphthofuran ring, a benzonaphthothiophene ring, a benzoisoquinoline ring, and a naphthoisoquinoline ring.

[0071] Specific examples of the luminescent compound are shown below, however, the present invention is not limited to these. [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka] [ka]

[0072] The exemplary compounds belonging to the AA group to the BB group are metal complexes in which the partial structure M(L)m is represented by the general formula [Ir-3] and which have a phenanthrene ring in the ligand. These compounds are particularly excellent in stability.

[0073] The exemplary compounds belonging to the CC group are metal complexes in which the partial structure M(L)m is represented by the general formula [Ir-4] and which have a triphenylene ring in the ligand. These compounds are particularly excellent in stability.

[0074] The exemplary compounds belonging to the DD group are metal complexes whose partial structure M(L)m is represented by the general formulas [Ir-5] to [Ir-8], and which have a dibenzofuran ring, a dibenzothiophene ring, a benzonaphthofuran ring, or a benzonaphthothiophene ring in the ligand. These compounds contain oxygen or sulfur atoms, and the abundant unshared electron pairs of these atoms can enhance the charge transport properties. Therefore, they are compounds that are particularly easy to adjust the carrier balance.

[0075] The exemplary compounds belonging to the EE group to the GG group are metal complexes whose partial structure M(L)m is represented by the general formulas [Ir-6] to [Ir-8], and which have a benzofluorene ring as a ligand. These compounds have a substituent at the 9-position of the fluorene ring in the direction perpendicular to the in-plane direction of the fluorene ring, and therefore can particularly prevent the condensed rings from overlapping each other. Therefore, they are compounds with particularly excellent sublimation properties.

[0076] The exemplary compounds belonging to the HH group are metal complexes whose partial structure M(L)m is represented by the general formulas [Ir-11] to [Ir-13], and which have a benzoisoquinoline ring in the ligand. These compounds contain nitrogen atoms in the condensed ring, and the charge transport properties can be enhanced by the unshared electron pairs and high electronegativity of these atoms. Therefore, they are particularly easy to adjust the carrier balance.

[0077] The exemplary compounds belonging to Group II are metal complexes whose partial structure M(L)m is represented by the general formula [Ir-14], and which have a naphthoisoquinoline ring in the ligand. These compounds contain nitrogen atoms in the condensed ring, and the charge transport properties can be enhanced by the unshared electron pairs and high electronegativity of these atoms. Therefore, they are particularly easy to adjust the carrier balance.

[0078] <Organic light-emitting element> The organic light-emitting element of this embodiment has a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode. The organic compound layer has at least a light-emitting layer. Here, the organic compound layer may be a single layer or a laminate consisting of multiple layers. When the organic compound layer is a laminate consisting of multiple layers, at least one of them is a light-emitting layer. In addition to the light-emitting layer, the organic compound layer may have a hole injection layer, a hole transport layer, an electron blocking layer, a hole-exciton blocking layer, an electron transport layer, an electron injection layer, etc. These layers contain at least one organic compound, and the T1 of the organic compound is different from the T1 of the first organic compound and the T1 of the second organic compound, and is preferably higher than the T1 of the first organic compound and the T1 of the second organic compound. The light-emitting layer may be a single layer or a laminate consisting of multiple layers.

[0079] In the organic light-emitting device of this embodiment, at least one of the organic compound layers contains the organic compound according to this embodiment.

[0080] The first organic compound or the second organic compound is also called a host or a host material, and is the compound that has the largest mass ratio among the compounds that constitute the light-emitting layer. The light-emitting compound is also called a guest, a guest material, or a light-emitting material, and is the compound that has a smaller mass ratio than the host among the compounds that constitute the light-emitting layer and is the compound that mainly emits light.

[0081] The host of the light-emitting layer according to this embodiment is composed of at least two kinds of hosts. The concentration of each of these hosts is preferably from 10% by mass to 90% by mass, more preferably from 20% by mass to 80% by mass, and further preferably from 30% by mass to 70% by mass, based on the total mass of the light-emitting layer.

[0082] The concentration of the guest relative to the host is from 0.01% by mass to 50% by mass, preferably from 0.1% by mass to 20% by mass, based on the total amount of the constituent materials of the light-emitting layer. From the viewpoint of suppressing concentration quenching, the concentration of the guest is particularly preferably 10% by mass or less.

[0083] The guest may be uniformly contained throughout the layer in which the host is the matrix, or may be contained with a concentration gradient.The guest may also be partially contained in a specific region within the layer, so that the light-emitting layer has a region containing only the host and no guest.

[0084] The light-emitting layer of the present invention may be a single layer or multiple layers, and it is also possible to mix colors by including a light-emitting material having another light-emitting color. Multiple layers means a state in which a light-emitting layer and another light-emitting layer are laminated. In this case, the light-emitting color of the organic light-emitting element is not particularly limited. More specifically, it may be white or an intermediate color. In the case of white, for example, if the light-emitting layer emits blue light, the other light-emitting layer emits a color different from blue, that is, green or red. Furthermore, a third light-emitting layer that emits blue light and a charge-generating layer may be provided between the light-emitting layer or the laminated light-emitting layer in the present invention and the first or second electrode. The charge-generating layer exerts the function as a tandem element, and the electrons generated from the charge-generating layer and the holes injected from the first electrode are charge-recombined to generate excitons, and the holes generated from the charge-generating layer and the electrons injected from the second electrode are charge-recombined to form excitons. Therefore, the internal quantum efficiency is doubled. In this case, the organic light-emitting element of the present invention can be applied to one side of the tandem element as a yellow light-emitting layer as a complementary color of blue light emission. Therefore, a white light emitting device can be provided by forming a tandem element with a blue light emitting layer using a stacked light emitting layer composed of the light emitting layer of the present invention. The third light emitting layer contains at least a third organic compound and a fourth organic compound. The third organic compound is a host material, and the fourth organic compound is a blue light emitting material.

[0085] The film is formed by deposition or coating.

[0086] Specific examples of the device configuration of the organic light-emitting device of this embodiment include a multi-layer device configuration in which electrode layers and organic compound layers shown in (1) to (6) below are sequentially laminated on a substrate. In any device configuration, the organic compound layer necessarily includes a light-emitting layer having a light-emitting material. (1) Anode / light-emitting layer / cathode (2) Anode / hole transport layer / light emitting layer / electron transport layer / cathode (3) Anode / hole transport layer / light emitting layer / electron transport layer / electron injection layer / cathode (4) Anode / hole injection layer / hole transport layer / light emitting layer / electron transport layer / cathode (5) Anode / hole injection layer / hole transport layer / light emitting layer / electron transport layer / electron injection layer / cathode (6) Anode / hole transport layer / electron blocking layer / light emitting layer / hole blocking layer / electron transport layer / cathode

[0087] However, these device configuration examples are merely very basic device configurations, and are not limited to these. For example, various layer configurations can be adopted, such as providing an insulating layer, an adhesive layer, or an interference layer at the interface between the electrode and the organic compound layer, forming an electron transport layer or a hole transport layer from two layers having different ionization potentials, forming an emitting layer from two layers made of different emitting materials, and so on.

[0088] Among the device configurations shown in (1) to (6) above, the configuration (6) is preferred because it has both an electron blocking layer and a hole blocking layer. In other words, in the configuration (6) having an electron blocking layer and a hole blocking layer, both hole and electron carriers can be reliably confined within the light-emitting layer, resulting in an organic light-emitting device with no carrier leakage and high light-emitting efficiency.

[0089] Here, the organic light-emitting device of the present invention is characterized in that the first organic compound and the second organic compound constituting the light-emitting layer have all of the freely rotatable single bonds being carbon-carbon bonds, preferably bonds between sp2 carbons. That is, they are composed of a highly planar host material. Therefore, the hole transport ability and the electron transport ability are higher than those of a general organic light-emitting device. As a result, the electron blocking layer and the hole blocking layer play an important role. For example, since the hole blocking layer needs to be stable against holes, it is preferable that the hole blocking layer compound is an organic compound with low reactivity, and furthermore, an organic compound consisting only of hydrocarbons. For example, since the electron blocking layer also needs to be stable against electrons, it is preferable that the electron blocking layer compound is an organic compound with low reactivity, and furthermore, an organic compound with all of the freely rotatable single bonds being carbon-carbon bonds, preferably bonds between sp2 carbons.

[0090] The mode of extraction (element form) of the light output from the light emitting layer may be a so-called bottom emission type in which light is extracted from the electrode on the substrate side, or a so-called top emission type in which light is extracted from the opposite side of the substrate. Also, a double-sided extraction type in which light is extracted from the substrate side and the opposite side of the substrate can be adopted.

[0091] <Other compounds> The organic compound according to this embodiment can be used as a constituent material of an organic compound layer other than the light-emitting layer constituting the organic light-emitting device of this embodiment. Specifically, it may be used as a constituent material of an electron transport layer, an electron injection layer, a hole transport layer, a hole injection layer, a hole blocking layer, etc. In this case, the emission color of the organic light-emitting device is not particularly limited. More specifically, it may be white or a neutral color.

[0092] In the organic light-emitting device according to this embodiment, conventionally known low-molecular-weight and high-molecular-weight hole-injecting or hole-transporting compounds, host compounds, light-emitting compounds, electron-injecting or electron-transporting compounds, etc. can be used together as necessary. Examples of these compounds are given below.

[0093] As the hole injection transport material, a material having high hole mobility is preferable so that the injection of holes from the anode can be easily performed and the injected holes can be transported to the light emitting layer. In addition, a material having a high glass transition temperature is preferable so as to suppress deterioration of the film quality such as crystallization in the organic light emitting device. Examples of low molecular weight and high molecular weight materials having hole injection transport performance include triarylamine derivatives, arylcarbazole derivatives, phenylenediamine derivatives, stilbene derivatives, phthalocyanine derivatives, porphyrin derivatives, poly(vinylcarbazole), poly(thiophene), and other conductive polymers. Furthermore, the above hole injection transport material is also preferably used in the electron blocking layer. Specific examples of compounds used as the hole injection transport material are shown below, but of course, the present invention is not limited to these. [ka] Examples of the luminescent material mainly involved in the luminescent function include, in addition to the organometallic complexes involved in the luminescent layer compound of the present invention, condensed ring compounds (e.g., fluorene derivatives, naphthalene derivatives, pyrene derivatives, perylene derivatives, tetracene derivatives, anthracene derivatives, rubrene, etc.), quinacridone derivatives, coumarin derivatives, stilbene derivatives, organoaluminum 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(phenylenevinylene) derivatives, poly(fluorene) derivatives, and poly(phenylene) derivatives. Specific examples of compounds used as luminescent materials are shown below, but are of course not limited to these. [ka] [ka]

[0094] The light-emitting layer host or light-emitting assist material contained in the light-emitting layer may contain a compound other than the organic compound of this embodiment as a third component. Examples of the third component include aromatic hydrocarbon compounds or derivatives thereof, carbazole derivatives, azine derivatives, xanthone derivatives, dibenzofuran derivatives, dibenzothiophene derivatives, organic aluminum complexes such as tris(8-quinolinolato)aluminum, and organic beryllium complexes. [ka]

[0095] The electron transporting material can be arbitrarily selected from those capable of transporting electrons injected from the cathode to the light-emitting layer, and is selected in consideration of the balance with the hole mobility of the hole transporting material. Examples of materials having electron transporting properties include oxadiazole derivatives, oxazole derivatives, pyrazine derivatives, triazole derivatives, triazine derivatives, quinoline derivatives, quinoxaline derivatives, phenanthroline derivatives, organic aluminum complexes, and condensed ring compounds (e.g., fluorene derivatives, naphthalene derivatives, chrysene derivatives, anthracene derivatives, etc.). Furthermore, the above electron transporting materials are also preferably used in the hole blocking layer. Specific examples of compounds used as electron transporting materials are shown below, but are of course not limited to these. [ka]

[0096] The electron injection material can be selected from those that can easily inject electrons from the cathode, and is selected in consideration of the balance with hole injection properties. Organic compounds include n-type dopants and reducing dopants. For example, compounds containing alkali metals such as lithium fluoride, lithium complexes such as lithium quinolinol, benzimidazolidene derivatives, imidazolidene derivatives, fulvalene derivatives, and acridine derivatives can be used in combination with the above electron transport materials.

[0097] <Configuration of organic light-emitting element> The organic light-emitting element is provided by forming an insulating layer, a first electrode, an organic compound layer, and a second electrode on a substrate. A protective layer, a color filter, a microlens, etc. may be provided on the second electrode. When a color filter is provided, a planarizing layer may be provided between the protective layer. The planarizing layer may be made of acrylic resin, etc. The same applies when a planarizing layer is provided between the color filter and the microlens.

[0098] [substrate] Examples of the substrate include quartz, glass, silicon wafer, resin, and metal. In addition, a switching element such as a transistor and wiring may be provided on the substrate, and an insulating layer may be provided thereon. As the insulating layer, any material can be used as long as it can form a contact hole so that wiring can be formed between the first electrode and the insulating layer, and insulation from wiring that is not connected can be ensured. For example, resin such as polyimide, silicon oxide, silicon nitride, etc. can be used.

[0099] [electrode] A pair of electrodes can be used. The 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 element 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.

[0100] The material constituting the anode should have as large a work function as possible. For example, metals such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium, tungsten, etc., mixtures containing these metals, alloys combining these metals, metal oxides such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO), and indium zinc oxide can be used. Conductive polymers such as polyaniline, polypyrrole, and polythiophene can also be used.

[0101] These electrode materials may be used alone or in combination of two or more kinds. The anode may be composed of one layer or multiple layers.

[0102] When used as a reflective electrode, for example, chromium, aluminum, silver, titanium, tungsten, molybdenum, or alloys or laminates thereof can be used. The above materials can also function as a reflective film without serving as an electrode. When used as a transparent electrode, a transparent conductive layer of oxide such as indium tin oxide (ITO) or indium zinc oxide can be used, but is not limited to these. Photolithography technology can be used to form the electrode.

[0103] On the other hand, the material for the cathode should have a small work function. Examples of the material include alkali metals such as lithium, alkaline earth metals such as calcium, aluminum, titanium, manganese, silver, lead, chromium, and other metals or mixtures containing these metals. Alternatively, alloys combining these metals can be used. For example, magnesium-silver, aluminum-lithium, aluminum-magnesium, silver-copper, zinc-silver, and the like can be used. Metal oxides such as indium tin oxide (ITO) can also be used. These electrode materials may be used alone or in combination of two or more types. The cathode may have a single layer structure or a multi-layer structure. Among these, it is preferable to use silver, and it is even more preferable to use a silver alloy to reduce the aggregation of silver. As long as the aggregation of silver can be reduced, the ratio of the alloy is not important. For example, the ratio of silver to other metals may be 1:1, 3:1, and the like.

[0104] The cathode may be a top-emission element using an oxide conductive layer such as ITO, or a bottom-emission element using a reflective electrode such as aluminum (Al), and is not particularly limited. The method for forming the cathode is not particularly limited, but it is more preferable to use a direct current or alternating current sputtering method, etc., since the film coverage is good and the resistance can be easily reduced.

[0105] [Organic compound layer] The organic compound layer may be formed as a single layer or as multiple layers. When the organic compound layer has multiple layers, it may be called 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, etc., depending on its function. The organic compound layer is mainly composed of an organic compound, but may also contain inorganic atoms and inorganic compounds. For example, it may contain copper, lithium, magnesium, aluminum, iridium, platinum, molybdenum, zinc, etc. The organic compound layer may be disposed between the first electrode and the second electrode, or may be disposed in contact with the first electrode and the second electrode.

[0106] The organic compound layers (hole injection layer, hole transport layer, electron blocking layer, light emitting layer, hole blocking layer, electron transport layer, electron injection layer, etc.) constituting the organic light emitting device according to one embodiment of the present invention are formed by the method shown below.

[0107] The organic compound layer constituting the organic light-emitting device according to one embodiment of the present invention can be formed by dry processes such as vacuum deposition, ionization deposition, sputtering, plasma, etc. Alternatively, instead of the dry process, a wet process can be used in which a layer is formed by dissolving the compound in an appropriate solvent and applying a known coating method (e.g., spin coating, dipping, casting, LB method, inkjet method, etc.).

[0108] Here, when the layer is formed by a vacuum deposition method or a solution coating method, crystallization is unlikely to occur and the layer has excellent stability over time. When the layer is formed by a coating method, the layer can be formed by combining with a suitable binder resin.

[0109] Examples of the binder resin include, but are not limited to, polyvinylcarbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenol resin, epoxy resin, silicone resin, and urea resin.

[0110] These binder resins may be used alone or in combination as homopolymers or copolymers, and may further include known additives such as plasticizers, antioxidants, and ultraviolet absorbers, if necessary.

[0111] [Protective layer] A protective layer may be provided on the second electrode. For example, by bonding glass provided with a moisture absorbent on the second electrode, it is possible to reduce the intrusion of water and the like into the organic compound layer and reduce the occurrence of display defects. In another embodiment, a passivation film such as silicon nitride may be provided on the second electrode to reduce the intrusion of water and the like into the organic compound layer. For example, after the second electrode is formed, it may be transported to another chamber without breaking the vacuum, and a silicon nitride film having a thickness of 2 μm may be formed by the CVD method to serve as a protective layer. A protective layer may be provided using an atomic deposition method (ALD method) after the film is formed by the CVD method. The material of the film formed by the ALD method is not limited, and may be silicon nitride, silicon oxide, aluminum oxide, etc. Silicon nitride may be further formed by the CVD method on the film formed by the ALD method. The film formed by the ALD method may have a smaller thickness than the film formed by the CVD method. Specifically, it may be 50% or less, or even 10% or less.

[0112] [Color Filter] A color filter may be provided on the protective layer. For example, a color filter taking into consideration the size of the organic light-emitting element may be provided on another substrate and then bonded to the substrate on which the organic light-emitting element is provided, or a color filter may be patterned on the protective layer described above using a photolithography technique. The color filter may be made of a polymer.

[0113] [Planarization layer] A planarization layer may be provided between the color filter and the protective layer. The planarization layer is provided for the purpose of reducing unevenness of the layer below. It may also be called a material resin layer without limiting the purpose. The planarization layer may be composed of an organic compound, and may be either a low molecular weight or a high molecular weight, but is preferably a high molecular weight.

[0114] The planarization layer may be provided above and below the color filter, and may be made of the same or different materials.Specific examples of the materials include polyvinylcarbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenol resin, epoxy resin, silicone resin, and urea resin.

[0115] [Microlens] The organic light-emitting element or the organic light-emitting device may have an optical member such as a microlens on the light-emitting side. The microlens may be made of acrylic resin, epoxy resin, or the like. The microlens may be intended to increase the amount of light extracted from the organic light-emitting element or the organic light-emitting device and to control the direction of the extracted light. The microlens may have a hemispherical shape. When the microlens has a hemispherical shape, among the tangents to the hemisphere, there is a tangent that is parallel to the insulating layer, and the tangent and the hemisphere are the vertices of the microlens. The vertex of the microlens can be determined in the same manner in any cross-sectional view. That is, among the tangents to the semicircle of the microlens in the cross-sectional view, there is a tangent that is parallel to the insulating layer, and the tangent and the semicircle are the vertices of the microlens.

[0116] It is also possible to define the midpoint of the microlens. In the cross section of the microlens, a line segment is imaginary from a point where an arc shape ends to a point where another arc shape ends, and the midpoint of the line segment can be called the midpoint of the microlens. The cross section for determining the vertex and midpoint may be a cross section perpendicular to the insulating layer.

[0117] [Opposite substrate] A counter substrate may be provided on the planarization layer. The counter substrate is called a counter substrate because it is provided at a position corresponding to the aforementioned substrate. The constituent material of the counter substrate may be the same as that of the aforementioned substrate. When the aforementioned substrate is a first substrate, the counter substrate may be a second substrate.

[0118] [Pixel circuit] An organic light-emitting device having an organic light-emitting element may have a pixel circuit connected to the organic light-emitting element. The pixel circuit may be an active matrix type that controls the emission of the first light-emitting element and the second light-emitting element independently. The active matrix type circuit may be a voltage programming circuit or a current programming circuit. The drive circuit has a pixel circuit for each pixel. The pixel circuit may have a light-emitting element, a transistor that controls the emission luminance of the light-emitting element, a transistor that controls the emission timing, a capacitance that holds the gate voltage of the transistor that controls the emission luminance, and a transistor for connecting to GND without going through the light-emitting element.

[0119] The light emitting device has a display region and a peripheral region arranged around the display region. The display region has a pixel circuit, and the peripheral region has a display control circuit. The mobility of a transistor constituting the pixel circuit may be smaller than the mobility of a transistor constituting the display control circuit. The slope of the current-voltage characteristic of the transistor constituting the pixel circuit may be smaller than the slope of the current-voltage characteristic of the transistor constituting the display control circuit. The slope of the current-voltage characteristic can be measured by the so-called Vg-Ig characteristic. The transistor constituting the pixel circuit is a transistor connected to a light emitting element, such as a first light emitting element.

[0120] [Pixels] An organic light emitting device having an organic light emitting element may have a plurality of pixels, each of which has sub-pixels that emit different colors, for example, each of which may have one of the RGB emission colors.

[0121] The pixel emits light in an area also called the pixel aperture. This area is the same as the first area. The pixel aperture may be 15 μm or less, or 5 μm or more. More specifically, it may be 11 μm, 9.5 μm, 7.4 μm, 6.4 μm, etc. The distance between the subpixels may be 10 μm or less, more specifically, it may be 8 μm, 7.4 μm, 6.4 μm.

[0122] The pixels may have a known arrangement in plan view. For example, they may be a stripe arrangement, a delta arrangement, a pentile arrangement, or a Bayer arrangement. The shape of the subpixels in plan view may be any known shape. For example, they may be a rectangle, a quadrangle such as a diamond, or a hexagon. Of course, if the shape is not an exact figure but is close to a rectangle, it is included in the rectangle. The shape of the subpixels and the pixel arrangement may be used in combination.

[0123] <Applications of organic light-emitting devices> The organic light-emitting device according to the present embodiment can be used as a component of a display device or a lighting device, and can also be used as an exposure light source for an electrophotographic image forming device, a backlight for a liquid crystal display device, a light-emitting device having a white light source and a color filter, etc.

[0124] The display device may be an image information processing device having an image input unit that inputs image information from an area CCD, a linear CCD, a memory card, etc., an information processing unit that processes the input information, and displays the input image on a display unit. The display device may have a plurality of pixels, and at least one of the plurality of pixels may have the organic light-emitting element of this embodiment and a transistor connected to the organic light-emitting element.

[0125] The display unit of the imaging device or inkjet printer may have a touch panel function. The driving method of the touch panel function may be an infrared type, a capacitance type, a resistive film type, or an electromagnetic induction type, and is not particularly limited. The display device may be used in the display unit of a multifunction printer.

[0126] Next, the display device according to the present embodiment will be described with reference to the drawings. Fig. 1 is a schematic cross-sectional view showing an example of a display device having an organic light-emitting element and a transistor connected to the organic light-emitting element. The transistor is an example of an active element. The transistor may be a thin film transistor (TFT).

[0127] FIG. 1(a) shows an example of a pixel, which is a component of the display device according to this embodiment. The pixel has sub-pixels 10. The sub-pixels are divided into 10R, 10G, and 10B according to their light emission. The emitted light color may be distinguished by the wavelength emitted from the light-emitting layer, or the light emitted from the sub-pixel may be selectively transmitted or color-converted by a color filter or the like. Each sub-pixel 10 has a reflective electrode, which is a first electrode 2, on an interlayer insulating layer 1, an insulating layer 3 covering the edge of the first electrode 2, an organic compound layer 4 covering the first electrode 2 and the insulating layer 3, a transparent electrode, which is a second electrode 5, a protective layer 6, and a color filter 7.

[0128] A transistor and a capacitor may be disposed below or inside the interlayer insulating layer 1. The transistor and the first electrode 2 may be electrically connected via a contact hole or the like (not shown).

[0129] The insulating layer 3 is also called a bank or a pixel separation film. It covers the ends of the first electrodes 2 and is disposed so as to surround the first electrodes 2. The portions where the insulating layer 3 is not disposed are in contact with the organic compound layer 4 and become light-emitting regions.

[0130] The organic compound layer 4 has 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 .

[0131] The second electrode 5 may be a transparent electrode, a reflective electrode, or a semi-transparent electrode.

[0132] The protective layer 6 reduces the penetration of moisture into the organic compound layer 4. The protective layer 6 is illustrated as being a single layer, but may be a multi-layer. Each layer may be an inorganic compound layer and an organic compound layer.

[0133] The color filters 7 are divided into 7R, 7G, and 7B according to their colors. The color filters 7 may be formed on a planarization film (not shown). Also, a resin protective layer (not shown) may be provided on the color filters 7. Also, the color filters 7 may be formed on the protective layer 6. Alternatively, the color filters 7 may be provided on an opposing substrate such as a glass substrate and then bonded thereto.

[0134] The display device 100 in Fig. 1(b) has an organic light-emitting element 26 and a TFT 18 as an example of a transistor. A substrate 11 made of glass, silicon, or the like is provided with an insulating layer 12 on the substrate. An active element such as the TFT 18 is provided on the insulating layer 12, and a gate electrode 13, a gate insulating film 14, and a semiconductor layer 15 of the active element are provided. The TFT 18 is also composed of a drain electrode 16 and a source electrode 17. An insulating film 19 is provided on the upper part of the TFT 18. An anode 21 constituting the organic light-emitting element 26 and the source electrode 17 are connected via a contact hole 20 provided in the insulating film 19.

[0135] The method of electrical connection between the electrodes (anode 21, cathode 23) included in the organic light-emitting element 26 and the electrodes (source electrode 17, drain electrode 16) included in the TFT 18 is not limited to the embodiment shown in Fig. 2(b). In other words, it is sufficient that either the anode 21 or the cathode 23 is electrically connected to either the source electrode 17 or the drain electrode 16 of the TFT 18. TFT stands for thin film transistor.

[0136] 1(b), the organic compound layer 22 is illustrated as a single layer, but the organic compound layer 22 may be a multi-layer. A first protective layer 24 and a second protective layer 25 are provided on the cathode 23 to reduce deterioration of the organic light-emitting element 26.

[0137] Although transistors are used as switching elements in the display device 100 of FIG. 1(b), other switching elements may be used instead.

[0138] The transistor used in the display device 100 of Fig. 1(b) is not limited to a transistor using a single crystal silicon wafer, but may be a thin film transistor having an active layer on an insulating surface of a substrate. Examples of the active layer include single crystal silicon, amorphous silicon, non-single crystal silicon such as microcrystalline silicon, and non-single crystal oxide semiconductors such as indium zinc oxide and indium gallium zinc oxide. Thin film transistors are also called TFT elements.

[0139] The transistors included in the display device 100 of Fig. 1(b) may be formed in a substrate such as a Si substrate. Here, "formed in a substrate" means that the substrate itself such as a Si substrate is processed to produce the transistors. In other words, having a transistor in a substrate can be seen as the substrate and the transistor being integrally formed.

[0140] The organic light-emitting element according to this embodiment has its light emission brightness controlled by a TFT, which is an example of a switching element, and by providing the organic light-emitting element on a plurality of surfaces, an image can be displayed based on the respective light emission brightnesses. The switching element according to this embodiment is not limited to a TFT, and may be a transistor formed of low-temperature polysilicon, or an active matrix driver formed on a substrate such as a Si substrate. On the substrate may also be within the substrate. Whether to provide a transistor within the substrate or to use a TFT is selected according to the size of the display unit. For example, if the size is about 0.5 inches, it is preferable to provide the organic light-emitting element on a Si substrate.

[0141] 2 is a schematic diagram showing an example of a display device according to the present embodiment. The display device 1000 may have a touch panel 1003, a display panel 1005, a frame 1006, a circuit board 1007, and a battery 1008 between an upper cover 1001 and a lower cover 1009. Flexible printed circuits FPC1002 and 1004 are connected to the touch panel 1003 and the display panel 1005. A transistor is printed on the circuit board 1007. The battery 1008 may not be provided if the display device is not a portable device, and may be provided in a different position if the display device is a portable device.

[0142] The display device according to this embodiment may have color filters having red, green, and blue colors, the red, green, and blue colors being arranged in a delta arrangement.

[0143] The display device according to the present embodiment may be used as a display unit of a mobile terminal. In this case, the display device may have both a display function and an operation function. Examples of the mobile terminal include mobile phones such as smartphones, tablets, and head-mounted displays.

[0144] The display device according to the present embodiment may be used as a display unit of an imaging device having an optical unit with a plurality of lenses and an imaging element that receives light that has passed through the optical unit. The imaging device may have a display unit that displays information acquired by the imaging element. The display unit may be a display unit exposed to the outside of the imaging device, or may be a display unit disposed within a viewfinder. The imaging device may be a digital camera or a digital video camera.

[0145] 3(a) is a schematic diagram showing an example of an imaging device according to this embodiment. The imaging device 1100 may have a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The viewfinder 1101 may have a display device according to this embodiment. In this case, the display device may display not only an image to be captured, but also environmental information, imaging instructions, and the like. The environmental information may include the intensity of external light, the direction of external light, the moving speed of the subject, the possibility that the subject will be blocked by an obstruction, and the like.

[0146] Since the timing suitable for imaging is short, it is better to display information as soon as possible. Therefore, it is preferable to use a display device using the organic light-emitting element of this embodiment. This is because the organic light-emitting element has a fast response speed. A display device using an organic light-emitting element can be used more preferably than a liquid crystal display device, which requires a high display speed.

[0147] The imaging device 1100 has an optical section (not shown). The optical section has a plurality of lenses, which form an image on an imaging element housed in a housing 1104. The focus of the plurality of lenses can be adjusted by adjusting their relative positions. This operation can also be performed automatically. The imaging device may be called a photoelectric conversion device. The photoelectric conversion device can include an imaging method that does not capture images sequentially, but detects the difference from the previous image, cuts out an image from an image that is always recorded, and the like.

[0148] FIG. 3(b) is a schematic diagram showing an example of an electronic device according to the present embodiment. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The housing 1203 may have a circuit, a printed circuit board having the circuit, a battery, and a communication unit. The operation unit 1202 may be a button or a touch panel type reaction unit. The operation unit 1202 may be a biometric recognition unit that recognizes a fingerprint and performs unlocking or the like. An electronic device having a communication unit can also be called a communication device. The electronic device 1200 may further have a camera function by including a lens and an image sensor. An image captured by the camera function is displayed on the display unit 1201. Examples of the electronic device 1200 include a smartphone and a notebook computer.

[0149] FIG. 4 is a schematic diagram showing an example of a display device according to the present embodiment. FIG. 4(a) shows a display device such as a television monitor or a PC monitor. The display device 1300 has a frame 1301 and a display unit 1302. The display unit 1302 may use a light-emitting element according to the present embodiment. The display device 1300 has the frame 1301 and a base 1303 that supports the display unit 1302. The base 1303 is not limited to the form shown in FIG. 4(a). The lower side of the frame 1301 may also serve as the base. The frame 1301 and the display unit 1302 may be curved. The radius of curvature may be 5000 mm or more and 6000 mm or less.

[0150] FIG. 4(b) is a schematic diagram showing another example of the display device according to the present embodiment. The display device 1310 in FIG. 4(b) is configured to be bendable, and is a so-called foldable display device. The display device 1310 has a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. The first display unit 1311 and the second display unit 1312 may have a light-emitting element according to the present embodiment. The first display unit 1311 and the second display unit 1312 may be one display unit without a joint. The first display unit 1311 and the second display unit 1312 can be separated at the bending point. The first display unit 1311 and the second display unit 1312 may display different images, or the first and second display units may display one image.

[0151] FIG. 5(a) is a schematic diagram showing an example of a lighting device according to the present embodiment. The lighting device 1400 may have a housing 1401, a light source 1402, a circuit board 1403, an optical filter 1404 that transmits light emitted by the light source 1402, and a light diffusion unit 1405. The light source 1402 may have an organic light-emitting element according to the present embodiment. The optical filter 1404 may be a filter that improves the color rendering of the light source. The light diffusion unit 1405 can effectively diffuse the light of the light source, such as for lighting up, and deliver the light over a wide range. The optical filter 1404 and the light diffusion unit 1405 may be provided on the light emission side of the lighting. If necessary, a cover may be provided on the outermost part.

[0152] The lighting device is, for example, a device that illuminates a room. The lighting device may emit white light, natural white light, or any other color from blue to red. It may have a dimming circuit that adjusts the light intensity. The lighting device may have the organic light-emitting element of this embodiment and a power supply circuit connected thereto. The power supply circuit is a circuit that converts AC voltage into DC voltage. Moreover, white has a color temperature of 4200K, and natural white has a color temperature of 5000K. The lighting device may have a color filter.

[0153] The lighting device according to the present embodiment may also include a heat dissipation section that dissipates heat from within the device to the outside, and examples of the heat dissipation section include metals with high specific heat, liquid silicon, and the like.

[0154] 5B is a schematic diagram of an automobile, which is an example of a moving body according to this embodiment. The automobile has tail lamps, which are an example of a lamp. The automobile 1500 has tail lamps 1501, and may be configured to turn on the tail lamps when braking or the like is performed.

[0155] The tail lamp 1501 may have an organic light-emitting element according to this embodiment. The tail lamp 1501 may have a protective member for protecting the organic light-emitting element. The protective member may be made of any material as long as it has a certain degree of strength and is transparent, but is preferably made of polycarbonate or the like. Polycarbonate may be mixed with a furandicarboxylic acid derivative, an acrylonitrile derivative, or the like.

[0156] The automobile 1500 may have a body 1503 and a window 1502 attached thereto. The window 1502 may be a transparent display unless it is a window for checking the front and rear of the automobile. The transparent display may have an organic light-emitting element according to this embodiment. In this case, the constituent materials of the electrodes and the like of the organic light-emitting element are made of transparent members.

[0157] The moving body according to the present embodiment may be a ship, an aircraft, a drone, or the like. The moving body may have a body and a lamp provided on the body. The lamp may emit light to indicate the position of the body. The lamp has the organic light-emitting element according to the present embodiment.

[0158] An application example of the display device of each of the above-mentioned embodiments will be described with reference to Fig. 6. The display device can be applied to a system that can be worn as a wearable device such as smart glasses, HMD, and smart contacts. An image capturing and display device used in such an application example has an image capturing device capable of photoelectrically converting visible light, and a display device capable of emitting visible light.

[0159] Fig. 6(a) is a schematic diagram showing an example of a wearable device according to an embodiment of the present invention. Using Fig. 6(a), glasses 1600 (smart glasses) according to one application example will be described. 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. In addition, a display device according to each of the above-mentioned embodiments is provided on the back side of the lens 1601.

[0160] The glasses 1600 further include a control device 1603. The control device 1603 functions as a power source that supplies power to the image capture device 1602 and the display device. The control device 1603 also controls the operations of the image capture device 1602 and the display device. The lens 1601 is formed with an optical system for focusing light on the image capture device 1602.

[0161] FIG. 6(b) is a schematic diagram showing another example of a wearable device according to an embodiment of the present invention. Using FIG. 7(b), glasses 1610 (smart glasses) according to one application example will be described. The glasses 1610 have a control device 1612, and the control device 1612 is equipped with an imaging device corresponding to the imaging device 1602 in FIG. 6(a) and a display device. The lens 1611 is formed with an imaging device in the control device 1612 and an optical system for projecting light emitted from the display device, and an image is projected onto the lens 1611. The control device 1612 functions as a power source that supplies power to the imaging device and the display device, and controls the operations of the imaging device and the display device.

[0162] The control device 1612 may have a gaze detection unit that detects the gaze of the wearer. Infrared light may be used to detect the gaze. The infrared light emitting unit emits infrared light to the eyeball of the user gazing at the display image. The image capturing unit having a light receiving element detects the reflected light of the emitted infrared light from the eyeball to obtain an image of the eyeball. By providing a reduction means for reducing the light from the infrared light emitting unit to the display unit in a planar view, the deterioration of image quality is reduced. The gaze of the user to the display image is detected from the image of the eyeball obtained by capturing infrared light. Any known method can be applied to gaze detection using the image of the eyeball. As an example, a gaze detection method based on a Purkinje image due to reflection of irradiated light on the cornea can be used. More specifically, gaze detection processing based on a pupil-corneal reflex method is performed. Using the pupil-corneal reflex method, a gaze vector representing the direction (rotation angle) of the eyeball is calculated based on the image of the pupil and the Purkinje image included in the image of the eyeball, thereby detecting the gaze of the user.

[0163] A display device according to an embodiment of the present invention may have an imaging device having a light receiving element, and may control a display image of the display device based on the user's line of sight information from the imaging device. Specifically, the display device determines a first field of view area to which the user gazes and a second field of view area other than the first field of view area 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 received from 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. In other words, the resolution of the second field of view area may be lower than that of the first field of view area.

[0164] The display area includes a first display area and a second display area different from the first display area, and an area having a high priority is determined from the first display area and the second display area based on 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 an external control device and received. The resolution of the area having a high priority may be controlled to be higher than the resolution of areas other than the area having a high priority. In other words, the resolution of an area having a relatively low priority may be lowered.

[0165] AI may be used to determine the first field of view area and the area with high priority. The AI ​​may be a model configured to estimate the angle of the line of sight and the distance to an object at the end of the line of sight from the image of the eyeball, using the image of the eyeball and the direction in which the eyeball in the image was actually looking as teacher data. The AI ​​program may be included in the display device, the imaging device, or an external device. If included in the external device, it is transmitted to the display device via communication.

[0166] When display control is performed based on visual recognition detection, the present invention is preferably applicable to smart glasses that further include an imaging device for capturing images of the outside world. The smart glasses can display captured outside information in real time.

[0167] FIG. 7(a) is a schematic diagram showing 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 photoconductor 27, an exposure light source 28, a charging unit 30, a developing unit 31, a transfer unit 32, a transport roller 33, and a fixing unit 35. Light 29 is irradiated from the exposure light source 28, and an electrostatic latent image is formed on the surface of the photoconductor 27. The exposure light source 28 includes an organic light-emitting element according to this embodiment. The developing unit 31 includes a toner, etc. The charging unit 30 charges the photoconductor 27. The transfer unit 32 transfers the developed image to a recording medium 34. The transport roller 33 transports 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.

[0168] 7(b) and 7(c) are diagrams showing the exposure light source 28, and are schematic diagrams showing a state in which a plurality of light-emitting units 36 are arranged on a long substrate. The arrow 37 is a direction parallel to the axis of the photoconductor, and represents the column direction in which the organic light-emitting elements are arranged. This column direction is the same as the axis direction about which the photoconductor 27 rotates. This direction can also be called the long axis direction of the photoconductor 27. FIG. 7(b) shows a form in which the light-emitting units 36 are arranged along the long axis direction of the photoconductor 27. FIG. 7(c) shows a form different from FIG. 7(b), in which the light-emitting units 36 are alternately arranged in the column direction in each of the first column and the second column. The first column and the second column are arranged at different positions in the row direction. In the first column, a plurality of light-emitting units 36 are arranged at intervals. In the second column, the light-emitting units 36 are arranged at positions corresponding to the intervals between the light-emitting units 36 in the first column. That is, a plurality of light-emitting units 36 are also arranged at intervals in the row direction. The arrangement in FIG. 7(c) can also be described as a grid-like arrangement, a houndstooth arrangement, or a checkerboard pattern.

[0169] As described above, by using a device using the organic light-emitting element according to this embodiment, it is possible to achieve a display with good image quality and stability even over a long period of time. EXAMPLES

[0170] The present invention will be described below with reference to examples, although the present invention is not limited thereto.

[0171] The first organic compound, the second organic compound, and the luminescent compound used in the luminescent layer in this embodiment are shown below.The compounds used in this embodiment are synthesized with reference to JP 2012-72099 A, JP 2013-518068 A, JP 2012-191031 A, US Patent Application Publication No. 2010 / 0051928, WO 2010 / 050778, WO 2012 / 077582, WO 2011 / 136156, and German Patent Application Publication No. 10 2010 005 697. [ka]

[0172] Table 10 shows the HOMO and LUMO levels of the above compounds. The HOMO level is the ionization potential value of each compound, which is measured by vacuum deposition of a 50 nm film using a Riken Keiki AC-3. The LUMO level is the value obtained by measuring the absorption spectrum of a similarly prepared film, determining the optical absorption edge as the band gap, and then subtracting this from the ionization potential value. [Table 10]

[0173] [Example 1] In this example, an organic light-emitting element having a top-emission structure was fabricated in which 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 were successively formed on a substrate.

[0174] A 40 nm Ti film was formed on a glass substrate by sputtering, and then patterned using photolithography to form an anode. The electrode area of ​​the anode was 3 mm. 2 Then, the mixture was washed.

[0175] Next, the electrode-attached substrate prepared above was attached to a vacuum deposition apparatus (manufactured by ULVAC), and after preparing the deposition material, 1.33 × 10 -4 Pa(1×10 -6 The chamber was evacuated to a pressure of 100 MPa (100 psi) (Torr). The inside of the chamber was then subjected to UV / ozone cleaning. Then, each layer was formed in the layer configuration shown in Table 11. [Table 11] Thereafter, the substrate was transferred to a glove box and sealed with a glass cap containing a desiccant in a nitrogen atmosphere to obtain an organic light-emitting device.

[0176] A voltage application device was connected to the obtained organic light-emitting device, and its characteristics were evaluated. The current-voltage characteristics were measured with a Hewlett-Packard microammeter 4140B, and the chromaticity was evaluated with a Topcon SR-3. The luminance was measured with a Topcon BM7. 2 The external quantum efficiency (EQE) during display was 18%, making it an excellent green organic light-emitting device.

[0177] In addition, the initial brightness is 2000cd / m 2 The degradation rate of the luminance after 100 hours was measured. The results are shown in Tables 12-1 to 12-3.

[0178] (Examples 2 to 23, Comparative Examples 1 to 11) Except for changing the configuration of the light-emitting layer in Example 1 to that shown in Tables 12-1 to 12-3, an organic light-emitting device was produced in the same manner as in Example 1, and the characteristics were evaluated. The results are shown in Tables 12-1 to 12-3.

[0179] For EQE, 1000cd / m 2 When displayed, the EQE ratio of 0.1 or less was marked as -, that of 0.1 to 0.9 or less was marked as x, and that of 1.0 or more was marked as ◯ relative to Example 1. The luminance degradation ratio is shown as a value when Comparative Example 10 is taken as 1.0. [Table 12-1] [Table 12-2] [Table 12-3] Comparing Example 1 and Comparative Example 1, the EQE of Example 1 is higher. This is because the present invention uses a luminescent compound, and the T1 of the first organic compound and the second organic compound is higher than that of the luminescent compound. Also, as shown in Comparative Example 2, even if a luminescent compound is used for the first organic compound and the second organic compound of Comparative Example 2, the T1 of the first organic compound and the second organic compound is higher than that of the luminescent compound, so the EQE is a low value.

[0180] Comparing Example 2 with Comparative Examples 3 to 5, Example 2 has an excellent luminance degradation ratio. Comparative Examples 3 to 5 have a binary structure of a first organic compound and a light-emitting compound, whereas Example 2 has a ternary structure of a first organic compound, a second organic compound, and a light-emitting compound. The first organic compound has a skeleton exhibiting hole transport properties, and the second organic compound has a skeleton exhibiting electron transport properties. As a result, it is possible to suppress exciton generation on the light-emitting compound, and therefore the organic light-emitting element of Example 2 has an excellent luminance degradation ratio.

[0181] Comparing Example 3 and Comparative Example 6, Example 3 has a superior luminance degradation ratio. This is because, in the molecular structure of the first organic compound, all of the freely rotatable single bonds in Z-21 of Example 3 are carbon-carbon bonds, whereas Z-22 of Comparative Example 6 has a carbon-nitrogen bond in the freely rotatable single bond. As described above, the bond energy of the carbon-nitrogen bond is lower than that of the carbon-carbon bond, and therefore the bond stability is poor. Therefore, the organic light-emitting device of Example 3 has a superior luminance degradation ratio.

[0182] Comparing Example 1 and Example 3, the luminance degradation ratio of Example 1 was even better. This is because, in the molecular structure of the first organic compound, all of the freely rotatable single bonds of Z-7 in Example 1 are bonds between sp2 carbons. As described above, the bond energy of the bonds between sp2 carbons is higher than the bond energy of carbon-carbon bonds, so the bond stability is even better. Therefore, the organic light-emitting device of Example 1 has a better luminance degradation ratio.

[0183] Comparing Example 2 with Examples 4 to 6, the luminance degradation ratios of Examples 4 and 5 are superior to those of Examples 2 and 6. Examples 4 and 5 have the same configuration as Examples 2 and 6, and further satisfy the relationship of formula (3). In other words, Examples 2 and Examples 4 to 6 are embodiments of an organic light-emitting device having the configuration (1-5). Therefore, the organic light-emitting devices of Examples 4 and 5 can more effectively suppress the trapping of holes on the light-emitting compound than the organic light-emitting devices of Examples 2 and 6, and can more effectively suppress the concentration of exciton generation on the light-emitting compound. Therefore, the organic light-emitting devices of Examples 4 and 5 have a superior luminance degradation ratio.

[0184] Comparing Example 7 and Example 8, Example 8 is superior in terms of luminance degradation ratio. The configuration of Example 7 is a configuration that satisfies the relationship of formula (4) in addition to the configuration of Example 8. In other words, Example 7 is an embodiment of an organic light-emitting device having the configuration (1-6), and Example 8 is an embodiment of an organic light-emitting device having the configuration (1-5). By satisfying the configuration of formula (4), the absolute value of the LUMO level of the light-emitting compound becomes the smallest, so that electron traps on the light-emitting compound can be further suppressed. Therefore, it is possible to further suppress the concentration of exciton generation on the light-emitting compound. Therefore, the organic light-emitting device of Example 7 is superior in terms of luminance degradation ratio.

[0185] Comparing Example 2 and Example 9, Example 9 has a better luminance degradation ratio. The organic light-emitting device of Example 9 has a configuration that satisfies formula (1) and formulas (3) to (5). In other words, Example 9 is an embodiment of an organic light-emitting device having the configuration (1-7). That is, the organic light-emitting device has the smallest absolute value of the HOMO level of the first organic compound and the largest absolute value of the LUMO level. By having the above configuration, it is possible to further suppress the trapping of electrons and holes on the light-emitting compound. In addition, since the generation rate of excitons is improved in the first organic compound, it is possible to suppress exciton concentration on the light-emitting compound, so that the organic light-emitting device of Example 9 has a better luminance degradation ratio.

[0186] Moreover, Example 20 is an organic light-emitting device that satisfies the formulas (1) to (4). In other words, Example 20 is an embodiment of an organic light-emitting device having the structure (1-5) and the structure (1-6). By satisfying the formulas (1) to (4), electrons or holes are unlikely to be trapped on the light-emitting compound, and therefore the generation of excitons on the light-emitting compound can be suppressed, resulting in an excellent luminance degradation ratio.

[0187] (Examples 24 and 25) An organic light-emitting device was produced and its characteristics were evaluated in the same manner as in Example 1, except that the light-emitting layer in Example 1 was changed to the configuration shown in Table 13. The results are shown in Table 13. The luminance degradation ratio is the ratio when the luminance degradation ratio in Example 25 is taken as 1.0. [Table 13] The organic light-emitting devices of Examples 24 and 25 have the structures (1-1) to (1-5) in common, and therefore exhibited excellent luminance degradation ratios. In particular, the organic light-emitting device of Example 24 has the structures (1-1) to (1-5) and (1-7). By having the above structures, the absolute value of the HOMO level of the first organic compound is the smallest and the absolute value of the LUMO level is the largest, so that exciton concentration on the light-emitting compound can be suppressed. Therefore, the organic light-emitting device of Example 25 exhibited a superior luminance degradation ratio.

[0188] (Examples 26 to 28, Comparative Examples 12 and 13) An organic light-emitting device was produced and its characteristics were evaluated in the same manner as in Example 1, except that the light-emitting layer in Example 1 was changed to the configuration shown in the following table. The results are shown in Table 14. The luminance degradation ratio is the ratio when the luminance degradation ratio in Comparative Example 13 is taken as 1.0. [Table 14] The organic light-emitting devices of Comparative Examples 12 and 13 have a carbon-nitrogen bond in the freely rotatable single bond of the first organic compound. As described above, the carbon-nitrogen bond has low bond energy and therefore poor bond stability. On the other hand, in the organic light-emitting devices of Examples 26 to 28, the freely rotatable single bond of the first organic compound is a carbon-carbon bond. Therefore, the organic light-emitting devices of Examples 26 to 28 showed superior luminance degradation ratios compared to Comparative Examples 12 and 13.

[0189] (Example 29) In this example, an organic light-emitting element having a top-emission structure was produced in which an anode, a hole injection layer, a hole transport layer, an electron blocking layer, a first light-emitting layer, a second light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a cathode were successively formed on a substrate.

[0190] A 40 nm Ti film was formed on a glass substrate by sputtering, and then patterned using photolithography to form an anode. The electrode area of ​​the anode was 3 mm. 2 Then, the mixture was washed.

[0191] Next, the electrode-attached substrate prepared above was attached to a vacuum deposition apparatus (manufactured by ULVAC), and after preparing the deposition material, 1.33 × 10 -4 Pa(1×10 -6 The chamber was evacuated to a pressure of 100 MPa (100 psi) (Torr). The inside of the chamber was then subjected to UV / ozone cleaning. Then, each layer was formed in the layer configuration shown in Table 15. [Table 15] Thereafter, the substrate was transferred to a glove box and sealed with a glass cap containing a desiccant in a nitrogen atmosphere to obtain an organic light-emitting device.

[0192] A voltage application device was connected to the obtained organic light-emitting device, and its characteristics were evaluated. The current-voltage characteristics were measured with a Hewlett-Packard microammeter 4140B, and the chromaticity was evaluated with a Topcon SR-3. The luminance was measured with a Topcon BM7. 2 During display, the yellow organic light emitting device was excellent.

[0193] In addition, the initial brightness is 2000cd / m 2 The degradation rate of luminance after 100 hours was measured. The results are shown in Table 16.

[0194] (Examples 30 to 32, Comparative Example 14) An organic light-emitting device was produced in the same manner as in Example 29, except that the light-emitting layer in Example 29 was changed to the configuration shown in the following table, and the characteristics were evaluated. The results are shown in Table 16. [Table 16] The organic light-emitting device of Comparative Example 14 has a carbon-nitrogen bond in the freely rotatable single bond of the first organic compound. As described above, the carbon-nitrogen bond has low bond energy and therefore poor bond stability. On the other hand, in the organic light-emitting devices of Examples 29 to 32, the freely rotatable single bond of the first organic compound is a carbon-carbon bond. Therefore, the organic light-emitting devices of Examples 29 to 32 showed superior luminance degradation ratios compared to Comparative Example 14.

[0195] As described above, by adjusting the HOMO-LUMO relationship using two organic compounds in which the freely rotatable bond is a carbon-carbon bond, charge trapping on the light-emitting compound can be suppressed. As a result, exciton concentration is suppressed, and an organic light-emitting element with excellent luminous efficiency and element durability can be obtained. In addition, by applying the organic light-emitting element according to the present invention to various light-emitting devices, a display device or lighting device with good luminous characteristics and excellent element durability can be obtained.

[0196] The present invention can also have the following configuration.

[0197] (Configuration 1) A first electrode and a second electrode; an organic compound layer disposed between the first electrode and the second electrode, the organic compound layer has a light-emitting layer, the light-emitting layer includes at least a first organic compound, a second organic compound, and a phosphorescent light-emitting compound; the lowest excited triplet energy of the first organic compound and the second organic compound is higher than the lowest excited triplet energy of the light-emitting compound; the first organic compound has all freely rotatable single bonds being carbon-carbon bonds; An organic light-emitting device that satisfies the relationship of formulas (1) and (2). |HOMO(H2)|>|HOMO(H1)| (1) In formula (1), HOMO(H1) and HOMO(H2) represent the HOMO of the first organic compound and the HOMO of the second organic compound, respectively.

[0198] (Configuration 2) The organic light-emitting device according to configuration 1, further satisfying the relationship of formula (2). |LUMO(H2)|>|LUMO(D)| (2) In formula (2), LUMO(H2) and LUMO(D) represent the LUMO of the second organic compound and the LUMO of the light-emitting compound, respectively.

[0199] (Configuration 3) 3. The organic light-emitting device according to configuration 1 or 2, further satisfying the relationship of formula (3). |LUMO(H1)|>|LUMO(D)| (3) In formula (3), LUMO(H1) represents the LUMO of the first organic compound.

[0200] (Configuration 4) 4. The organic light-emitting device according to any one of configurations 1 to 3, further satisfying the relationship of formula (4). |LUMO(H1)|>|LUMO(H2)| (4)

[0201] (Configuration 5) 5. The organic light-emitting device according to any one of configurations 1 to 4, further satisfying the relationship of formula (5). |HOMO(D)|>|HOMO(H1)| (5) In formula (5), HOMO(D) and HOMO(H1) represent the HOMO of the light-emitting compound and the HOMO of the first organic compound, respectively.

[0202] (Configuration 6) 6. The organic light-emitting element according to any one of configurations 1 to 5, wherein in the first organic compound, all of the freely rotatable single bonds are bonds between sp2 carbon atoms.

[0203] (Configuration 7) 7. The organic light-emitting device according to any one of structures 1 to 6, wherein in the second organic compound, all of the freely rotatable single bonds are carbon-carbon bonds.

[0204] (Configuration 8) 8. The organic light-emitting element according to any one of configurations 1 to 7, wherein in the second organic compound, all of the freely rotatable single bonds are bonds between sp2 carbon atoms.

[0205] (Configuration 9) 9. The organic light-emitting device according to any one of configurations 1 to 8, wherein the first organic compound has a skeleton represented by general formula (1-1) or (1-2). [ka] In the general formulas (1-1) and (1-2), the cyclic units A to C are each independently selected from a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group. Q1 to Q3 are each a direct bond, C(R A )(R B ), N(R C ), an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom. R A ~R C 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 aryl group, and a substituted or unsubstituted heteroaryl group. C forms a ring with the adjacent cyclic units A to C.

[0206] (Configuration 10) 10. The organic light-emitting device according to any one of claims 1 to 9, wherein the first organic compound has a skeleton represented by the following structural formula: [ka]

[0207] (Configuration 11) 11. The organic light-emitting device according to any one of configurations 1 to 10, wherein the second organic compound has a skeleton represented by any one of general formulas (2-1) to (2-7). [ka] In the general formulas (2-1) and (2-2), the cyclic units D to F are each independently selected from a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group. Q4 is a direct bond, C(R D )(R E ), an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom. R D and R Eare 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 aryl group, and a substituted or unsubstituted heteroaryl group. n is an integer of 1 to 5. In the general formulas (2-3) to (2-7), R to R 20 are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group. 20 Among these, adjacent substituents may be bonded to each other to form a condensed ring.

[0208] (Configuration 12) 12. The organic light-emitting device according to any one of configurations 1 to 11, wherein the second organic compound has a skeleton represented by the following structural formula: [ka]

[0209] (Configuration 13) The organic compound layer is composed of a plurality of layers, the plurality of layers is composed of at least a light-emitting layer and a second layer different from the light-emitting layer, the second layer comprises at least one organic compound; 13. The organic light-emitting element according to claim 1, wherein the lowest excited triplet energy of the organic compound is higher than the lowest excited triplet energy of the first organic compound and the second organic compound.

[0210] (Configuration 14) the light-emitting layer is a first light-emitting layer, a second light-emitting layer different from the first light-emitting layer is provided between the first light-emitting layer and the first electrode, or between the first light-emitting layer and the second electrode; 14. The organic light-emitting device according to any one of Structures 1 to 13, wherein the second light-emitting layer emits light of a color different from that of the light emitted by the first light-emitting layer.

[0211] (Configuration 15) A display device comprising a plurality of pixels, at least one of the plurality of pixels comprising an organic light-emitting element according to any one of structures 1 to 14 and a transistor connected to the organic light-emitting element.

[0212] (Configuration 16) an optical unit having a plurality of lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image captured by the image sensor; 15. A photoelectric conversion device, wherein the display section comprises the organic light-emitting element according to any one of configurations 1 to 14.

[0213] (Configuration 17) An electronic device comprising: a display unit having the organic light-emitting element according to any one of configurations 1 to 14; a housing in which the display unit is provided; and a communication unit provided in the housing and configured to communicate with an external device.

[0214] (Configuration 18) 15. A lighting device comprising: a light source having the organic light-emitting element according to any one of configurations 1 to 14; and a light diffusion section or an optical film that transmits light emitted by the light source.

[0215] (Configuration 19) A moving body comprising: a lighting fixture having the organic light-emitting element according to any one of configurations 1 to 14; and a body on which the lighting fixture is provided.

[0216] (Configuration 20) A photoconductor and an exposure light source for exposing the photoconductor, 15. An image forming apparatus, comprising: an exposure light source having the organic light-emitting element according to any one of configurations 1 to 14. [Explanation of symbols]

[0217] 1 Board 2 reflective electrode 3. Insulation layer 4 Organic compound layer 5 Light extraction electrode 6 Sealing layer 7 Color Filters 10 Light emitting element 11 Substrate 12 Moisture barrier 13 Gate electrode 14 Gate insulating film 15 Semiconductor layer 16 Drain electrode 17 Source electrode 18 TFT element 19 Insulating film 20 Contact Hole 21 Anode 22 Organic compound layer 23 Cathode 24 First protective layer 25 Second protective layer 1000 display devices 1001 Top cover 1002 Flexible Printed Circuit 1003 Touch Panel 1004 Flexible Printed Circuit 1005 Display panel 1006 Frame 1007 Circuit Board 1008 Battery 1009 Lower cover 1100 Imaging device 1101 Viewfinder 1102 Rear display 1103 Operation section 1104 Case 1200 Electronic equipment 1201 Display section 1202 Operation unit 1203 Case 1300 display device 1301 Picture Frame 1302 Display section 1303 Foundation 1310 Display device 1311 First display section 1312 Second display section 1313 Case 1314 Bend Point 1500 Cars 1501 Tail lamp 1502 Window 1503 Body

Claims

1. A first electrode and a second electrode, An organic light-emitting device having an organic compound layer disposed between the first electrode and the second electrode, wherein The organic compound layer has a light-emitting layer, The light-emitting layer has at least a first organic compound, a second organic compound, and a light-emitting compound that emits phosphorescence, The lowest excited triplet energy of the first organic compound and the second organic compound is higher than the lowest excited triplet energy of the light-emitting compound, In the first organic compound, all singly-bonded atoms that can freely rotate are carbon-carbon bonds, The first organic compound has a skeleton represented by general formula (1-1) or (1-2), An organic light-emitting device characterized by satisfying formula (1). |HOMO(H2)| > |HOMO(H1)| (1) In formula (1), HOMO(H1) and HOMO(H2) represent the HOMO of the first organic compound and the HOMO of the second organic compound, respectively. 【Chemical 1】 In general formulas (1-1) and (1-2), cyclic units A to C are each independently selected from a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group. Q1 to Q3 are each independently selected from a direct bond, C(RA)(RB), N(RC), an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom. RA to RC 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 aryl group, or a substituted or unsubstituted heteroaryl group. RC forms a ring with adjacent cyclic units A to C.

2. The organic light-emitting device according to claim 1, further satisfying the relationship of formula (2). |LUMO(H2)| > |LUMO(D)| (2) In formula (2), LUMO(H2) and LUMO(D) represent the LUMO of the second organic compound and the LUMO of the light-emitting compound, respectively.

3. The organic light-emitting device according to claim 1, further satisfying the relationship of formula (3). |LUMO(H1)| > |LUMO(D)| (3) In formula (3), LUMO(H1) represents the LUMO of the first organic compound.

4. A first electrode and a second electrode, An organic light-emitting device having an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer has at least a first organic compound, a second organic compound, and a light-emitting compound that emits phosphorescence, the lowest excited triplet energy of the first organic compound and the second organic compound is higher than the lowest excited triplet energy of the light-emitting compound, in the first organic compound, all single bonds capable of free rotation are carbon-carbon bonds, the first organic compound has a skeleton represented by the general formula (1-1) or (1-2), An organic light-emitting device characterized by satisfying the relationships of formulas (1) to (3). |HOMO(H2)| > |HOMO(H1)| (1) |LUMO(H2)| > |LUMO(D)| (2) |LUMO(H1)| > |LUMO(D)| (3) In formulas (1) to (3), HOMO(H1) and HOMO(H2) represent the HOMO of the first organic compound and the HOMO of the second organic compound, respectively, and LUMO(H1), LUMO(H2), and LUMO(D) represent the LUMO of the first organic compound, the LUMO of the second organic compound, and the LUMO of the light-emitting compound, respectively.

5. The organic light-emitting device according to any one of claims 1 to 3, further satisfying the relationship of formula (4). |LUMO(H1)| > |LUMO(H2)| (4)

6. The organic light-emitting device according to any one of claims 1 to 3, further satisfying the relationship of formula (5). |HOMO(D)| > |HOMO(H1)| (5) In formula (5), HOMO(D) and HOMO(H1) represent the HOMO of the light-emitting compound and the HOMO of the first organic compound, respectively.

7. The organic light-emitting device according to claim 1, further satisfying the relationships of formulas (2) and (3). |LUMO(H2)| > |LUMO(D)| (2) |LUMO(H1)| > |LUMO(D)| (3)

8. The organic light-emitting device according to claim 1, further satisfying the relationships of formulas (2) and (4). |LUMO(H2)| > |LUMO(D)| (2) |LUMO(H1)| > |LUMO(H2)| (4)

9. The organic light-emitting device according to claim 1, further satisfying the relationships of formulas (2) to (4). |LUMO(H2)| > |LUMO(D)| (2) |LUMO(H1)| > |LUMO(D)| (3) |LUMO(H1)| > |LUMO(H2)| (4)

10. The organic light-emitting device according to claim 1, further satisfying the relationships of formulas (3) to (5). |LUMO(H1)| > |LUMO(D)| (3) |LUMO(H1)| > |LUMO(H2)| (4) |HOMO(D)| > |HOMO(H1)| (5)

11. The organic light-emitting device according to any one of claims 1 to 3, wherein all of the single bonds capable of free rotation in the first organic compound are bonds between sp2 carbons.

12. The organic light-emitting device according to any one of claims 1 to 3, wherein all of the single bonds capable of free rotation in the second organic compound are carbon-carbon bonds.

13. The organic light-emitting device according to any one of claims 1 to 3, wherein all of the single bonds capable of free rotation in the second organic compound are bonds between sp2 carbons.

14. The organic light-emitting device according to claim 1, wherein the first organic compound has a skeleton represented by general formula (1-1) or (1-2). 【Chemical 2】 In general formulas (1-1) and (1-2), cyclic units A to C are each independently selected from a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group. Q １ to Q ３ is each independently selected from a direct bond, C(R Ａ )(R Ｂ ), N(R Ｃ ), an oxygen atom, a sulfur atom, a selenium atom, or a tellurium atom. R Ａ to R Ｃ 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 aryl group, or a substituted or unsubstituted heteroaryl group. R Ｃ forms a ring with the adjacent cyclic units A to C.

15. The organic light-emitting device according to claim 4 or 14, wherein the first organic compound has a skeleton represented by the following structural formula. [Chemical Formula 3]

16. The organic light-emitting device according to any one of claims 1 to 3, wherein the second organic compound has a skeleton represented by general formulas (2-1) to (2-7). [Chemical Formula 4] In general formulas (2-1) and (2-2), cyclic units D to F are each independently selected from a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group. Q ４ is each independently selected from a direct bond, C(R Ｄ )(R Ｅ ), an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom. R Ｄ and R Ｅ 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 aryl group, or a substituted or unsubstituted heteroaryl group. n is an integer of any one of 1 to 5. In general formulas (2-3) to (2-7), R １ to R ２０ are each independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group. Among R １ to R ２０ substituents adjacent to each other may be bonded to form a condensed ring.

17. The organic light-emitting device according to claim 16, wherein the second organic compound has a skeleton represented by the following structural formula. 【Chemical Formula 5】

18. The organic compound layer is composed of a plurality of layers, The plurality of layers are composed of at least a second layer different from the light-emitting layer and the light-emitting layer, The second layer contains at least one organic compound, The organic light-emitting device according to any one of claims 1 to 3, wherein the lowest excited triplet energy of the organic compound is higher than the lowest excited triplet energies of the first organic compound and the second organic compound.

19. The light-emitting layer is a first light-emitting layer, Between the first light-emitting layer and the first electrode, or between the first light-emitting layer and the second electrode, further comprising a second light-emitting layer different from the first light-emitting layer, The organic light-emitting device according to any one of claims 1 to 3, wherein the second light-emitting layer emits light of a color different from the light emitted by the first light-emitting layer.

20. A display device having a plurality of pixels, wherein at least one of the plurality of pixels includes the organic light-emitting device according to any one of claims 1 to 4 and a transistor connected to the organic light-emitting device.

21. An optical unit having a plurality of lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image captured by the image sensor, The photoelectric conversion device, wherein the display unit includes the organic light-emitting device according to any one of claims 1 to 4.

22. An electronic device having a display unit including the organic light-emitting device according to any one of claims 1 to 4, a housing provided with the display unit, and a communication unit provided in the housing and communicating with the outside.

23. A lighting device having a light source including the organic light-emitting device according to any one of claims 1 to 4 and a light diffusing unit or an optical film that transmits light emitted by the light source.

24. A moving body having a lighting fixture including the organic light-emitting device according to any one of claims 1 to 4 and a body provided with the lighting fixture.

25. A photoreceptor and an exposure light source for exposing the photoreceptor, The image forming apparatus, wherein the exposure light source includes the organic light-emitting device according to any one of claims 1 to 4.

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