Abstract: The present disclosure relates to an organic light-emitting device that is configured to operate at a low driving voltage and that has excellent durability. The organic light-emitting device includes a first light-emitting unit and a second light-emitting unit with a charge generation region interposed therebetween. The charge generation region includes an n-type charge generation layer containing at least a first organic compound and a second organic compound. The first organic compound and the second organic compound satisfy the relationships represented by the following Formulae [1] and [2-1]: ? "\[LeftBracketingBar]" LUMO ? ( H ? 1 ) - LUMO ? ( H ? 2 ) ? "\[RightBracketingBar]" ? 0.1 eV [ 1 ] HOMO ? ( H ? 2 ) - HOMO ? ( H ? 1 ) > 0.

Abstract: A organic light-emitting element including a positive electrode, a light-emitting layer, and a negative electrode in this order, wherein the light-emitting layer contains a dopant material, a host material, and an assist material, the dopant material is a compound represented by the following general formula [1], the host material is a hydrocarbon compound, and the assist material has a lower LUMO level than the host material. In the formula [1], R1 to R10 denote a hydrogen atom, an alkyl group, or the like. X denotes O or S. m denotes an integer in the range of 1 to 3, and n denotes an integer in the range of 0 to 2, provided that m+n is 3. The partial structure IrLn is any one of structures represented by the following formulae [2] and [3], wherein R11 to R21 denote a hydrogen atom, an alkyl group, or the like.

Abstract: An organic compound represented by formula [1]: R1 to R10 are each independently selected from the group consisting of a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group. However, at least one of R2, R3, R8, and R9 is selected from the group consisting of a deuterium atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted heterocyclic group.

Abstract: An organic compound represented by formula [1]: R1 to R27 denote a hydrogen atom or a substituent. Ar denotes a substituted or unsubstituted aryl group. n denotes an integer of 1 or more and 5 or less. L denotes any one of multiple structural formulas or a combination thereof. When n is 2 or more, a plurality of Ls may be the same or different.

Abstract: An organic compound represented by general formula [1]: where in formula [1], R1 to R14 are each independently selected from, for example, a hydrogen atom and an alkyl group, provided that at least one of R1 to R14 is a tertiary alkyl group, m is an integer of 1 or more and 3 or less, and n is an integer of 0 or more and 2 or less, provided that m+n is 3, X is a bidentate ligand, and a partial structure IrX is any of structures represented by general formulae [2] and [3], where in formulae [2] and [3], R21 to R23, and R31 to R38 are each independently selected from, for example, a hydrogen atom and an alkyl group, and adjacent groups of R35 to R38 are optionally taken together to form a ring.

Abstract: A organic light-emitting element including a positive electrode, a light-emitting layer, and a negative electrode in this order, wherein the light-emitting layer contains a dopant material, a host material, and an assist material, the dopant material is a compound represented by the following general formula [1], the host material is a hydrocarbon compound, and the assist material has a lower LUMO level than the host material. In the formula [1], R1 to R10 denote a hydrogen atom, an alkyl group, or the like. X denotes O or S. m denotes an integer in the range of 1 to 3, and n denotes an integer in the range of 0 to 2, provided that m+n is 3. The partial structure IrLn is any one of structures represented by the following formulae [2] and [3], wherein R11 to R21 denote a hydrogen atom, an alkyl group, or the like.

Abstract: An organic compound is represented by formula [1]. In formula [1], L and L? are bidentate ligands different from each other, a partial structure IrLm is a partial structure represented by formula [2], and a partial structure IrL?n is a partial structure represented by formula [3-1] or formula [3-2].

Abstract: An organic compound represented by formula [1], where in formula [1], R1 to R8 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, and other substituents, and X1 is oxygen, sulfur, selenium, tellurium, or a CR9R10 group, in which R9 and R10 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, and other substituents, and at least one of R1 to R8 is a group represented by formula [2].

Abstract: The present disclosure provides an organic light-emitting device including, in this order, a first electrode, a first light-emitting layer, a charge transport layer, a charge generation region including a charge generation layer and an intermediate layer, a second light-emitting layer, and a second electrode, in which the charge generation layer contains a metal atom, the intermediate layer is disposed between the charge generation layer and the second light-emitting layer, and the intermediate layer contains a fused polycyclic hydrocarbon compound.

Abstract: The present disclosure provides an organic compound represented by the following general formula [1].

Abstract: An organic light-emitting element including a first light-emitting layer that includes a first organic compound, a first light-emitting material, and a second light-emitting material and including a second light-emitting layer that includes a second organic compound and a third light-emitting material, wherein the hole-trapping ability of the first light-emitting layer is mitigated and the recombination region of holes and electrons is kept away from the electrode side of the first light-emitting layer and is also localized in the light-emitting layer by controlling the difference between the HOMO levels of the first light-emitting material and first organic compound in the first light-emitting layer to be smaller than the difference between the LUMO levels of the second organic compound and third light-emitting material in the second light-emitting layer, and reducing the content of the light-emitting material in the first light-emitting layer.

Abstract: An organic compound represented by formula (1): (A)n1-L-(B)n2??(1) in the general formula (1), (A) has a structure represented by a general formula (2), and (B) has a structure represented by a general formula (3) or a general formula (4): in the general formulae (2) to (4), R101 to R316 are each a hydrogen atom or any substituent; L is a linking group; one of R101 to R111 in the general formula (2), one of R201 to R208 in the general formula (3), and one of R301 to R308 in the general formula (4) are the binding positions to L.

Abstract: An exposure head comprising an organic light emitting element. The organic light emitting element includes a first electrode, a second electrode, an organic compound layer arranged between the first electrode and the second electrode, and a protection layer covering the second electrode. The organic compound layer includes a light emitting layer, and the number of peaks in an exposure spectrum emitted from the exposure head is greater than the number of peaks in a PL spectrum of the light emitting material included in the light emitting layer.

Abstract: An image forming apparatus includes an exposure light source including an organic light emitting element and a photoconductor configured to receive light emitted from the organic light emitting element, wherein a light emitting intensity of the organic light emitting element at end of supply of current to the organic light emitting element is defined as L0, a period from the end of supply of current to the organic light emitting element to quenching of the organic light emitting element is defined as T1, a period from start of supply of current to the organic light emitting element to the end of supply of current to the organic light emitting element is defined as T2, and T2 is larger than T1.

Abstract: An organic light emitting element includes a first electrode, a first light emitting unit, a charge generation layer, a second light emitting unit, and a second electrode that are arranged in this order. The second light emitting unit includes a first light emitting layer. The first light emitting unit includes a first organic layer, a second light emitting layer, and a second organic layer arranged in this order of proximity to the first electrode. The first light emitting layer contains a first compound and a second compound. The first organic layer contains a third compound. The second light emitting layer contains a fourth compound. The second organic layer contains a fifth compound. The first compound and the second compound satisfy relationship LUMO(A)>LUMO(B), where LUMO(A) and LUMO(B) respectively represent lowest unoccupied molecular orbital energy levels of the first compound and the second compound.

Abstract: An organic compound, represented by formula [1] or [2], suitably used for a thermally activated delayed fluorescent device: where X1 to X18 and X21 to X38 are each independently selected from the group consisting of a hydrogen atom, and substituents, Y is oxygen, sulfur, selenium, tellurium, a CR1R2 group, or a carbonyl group, where R1 and R2 are each independently selected from the group consisting of a hydrogen atom, and substituents, and Z is an alkyl group, an aryl group, or a heterocyclic group.

Abstract: An organic compound represented by formula [1-1] or [1-2]: where R1 to R20 are each independently selected from a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an amino group, an aromatic hydrocarbon group, a heterocyclic group, an aryloxy group, a silyl group, and a cyano group, in which at least one of R1 to R4 and R6 to R9 and at least one of R11 to R14 and R16 to R19 are amino groups; and X1 to X4 are each oxygen, sulfur, selenium, or tellurium and are optionally the same or different.

Abstract: An organic light-emitting device that is highly efficient and has excellent driving durability characteristics. The present disclosure provides an organic light-emitting device including a substrate, a first electrode, a light-emitting layer, and a second electrode. The light-emitting layer contains a first organic compound, a second organic compound, and a third organic compound. A freely rotatable single bond in each of the first to third organic compounds is a carbon-carbon bond. At least one carbon of the freely rotatable carbon-carbon bond in the second organic compound is an sp2 carbon atom. Letting the HOMO energy level of the first organic compound be HOMO1, letting the LUMO energy level of the second organic compound be LUMO2, and letting the HOMO and LUMO energy levels of the third organic compound be HOMO3 and LUMO3, [I] and [II] are satisfied: |LUMO2|>|LUMO3|??[I] |HOMO3|>|HOMO1|??[II].

Abstract: An imaging display device includes an imaging unit, a processing unit, a display unit, and a pupil detection unit. The imaging unit includes a plurality of photoelectric conversion elements and is configured to acquire first image information. The processing unit is configured to process a signal from the imaging unit and generate second image information. The display unit is configured to display an image that is based on the signal from the processing unit. The pupil detection unit is configured to detect vector information of a pupil. The processing unit generates the second image information by processing the first image information based on the vector information on the pupil.

Abstract: An organic light-emitting device including, in sequence, an anode, a first light-emitting layer, a second light-emitting layer, and a cathode. The first light-emitting layer and the second light-emitting layer are in contact with each other. The first light-emitting layer contains a first organic compound and a first metal complex. The second light-emitting layer contains a second organic compound, a third organic compound, and a second metal complex. The third organic compound is not a metal complex. The following relationships (a) to (c) satisfy: HOMO ? ( D ? 1 ) > HOMO ? ( H ? 1 ) ( a ) LUMO ? ( H ? 2 ) > LUMO ? ( H ? 3 ) ( b ) HOMO ? ( D ? 1 ) - HOMO ? ( H ? 1 ) > LUMO ? ( H ? 2 ) - LUMO ? ( H ? 3 ) .