Abstract: An object of the present invention is to provide, as a material for a highly efficient and highly durable organic EL element, an organic compound that has excellent properties, including excellent electron-injecting/transporting capability, hole-blocking capability, and high stability in the form of a thin film. Another object of the present invention is to provide a highly efficient and highly durable organic EL element by using this compound. The present invention focuses on the properties of the benzazole ring, which has affinity for electrons, and specifically focuses on the capability of its nitrogen atom to coordinate to a metal and also on excellent heat resistance. The inventors have thus designed and chemically synthesized various compounds having a benzazole ring structure, and then experimentally produced organic EL elements including the compounds, followed by thoroughly evaluating the characteristics thereof.

Abstract: An organic electroluminescent device having a capping layer composed of material having a high refractive index, excelling in thin film stability and durability and having no absorption in the respective wavelength ranges of blue, green, and red is provided to improve device characteristics of the organic electroluminescent device, particularly to greatly improve light extraction efficiency. The organic electroluminescent device has at least an anode electrode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode electrode, and the capping layer in this order, wherein the capping layer contains an arylamine compound (X) having a structure in which two triphenylamine structures are joined within a molecule via a single bond or a divalent group that does not contain a heteroatom.

Abstract: A semiconductor light-emitting element includes: a semiconductor stack; a contact electrode disposed above the semiconductor stack; and a pad layer disposed above the contact electrode and containing Au. The pad layer includes a first layer disposed above a region in which the pad layer and the contact electrode are in contact with each other, and a second layer disposed above the first layer and in contact with the first layer. In a direction parallel to a principal surface of the contact electrode, a mean grain size of Au in the second layer is larger than a mean grain size of Au in the first layer.

Abstract: The present invention relates to an organic EL device having at least an anodic electrode, a hole transport layer, a light emitting layer, an electron transport layer, a cathodic electrode, and a capping layer in this order, in which the capping layer contains an amine compound having a benzazole ring structure represented by the following general formula (A-1).

Abstract: A nitride semiconductor light-emitting element includes: an n-side semiconductor layer; one or more light-emitting layers disposed above the n-side semiconductor layer; a first barrier layer disposed above the one or more light-emitting layers and including Al; a second barrier layer disposed above the first barrier layer and including Al; a p-side guiding layer disposed above the second barrier layer and having an Al composition ratio smaller than an Al composition ratio of the second barrier layer; an electron blocking layer disposed above the p-side guiding layer, including Mg, and having an Al composition ratio larger than the Al composition ratio of the second barrier layer; and a p-side semiconductor layer disposed above the electron blocking layer.

Abstract: An object of the present invention is to provide a compound with a high refractive index and a low extinction coefficient at a wavelength in range of 450 nm to 750 nm in a capping layer to improve light extraction efficiency of an organic electroluminescent device. The present invention was achieved by focusing on the fact that a specific arylamine based compound has excellent thin film stability and durability and is able improve the refractive index by adjusting the molecular structures, and planning molecule, and an organic electroluminescent device having excellent luminous efficiency was obtained by using this compound as a material for constituting a capping layer.

Abstract: The present disclosure is related to an organic EL element including a capping layer that contains a compound represented by formula (A-1). In the formula, A and X are monovalent groups represented by formula (B-1) having 1 binding site among R1 to R6. Z represents a monovalent group represented by formula (B-1) having 1 binding site among R1 to R6, an aromatic hydrocarbon group, an aromatic heterocyclic group or a fused polycyclic aromatic group. Ar is a single bond or a divalent group of an aromatic hydrocarbon group, an aromatic heterocyclic group, or a fused polycyclic aromatic group. R1 to R6 are each defined in the specification, and Q represents a nitrogen atom, an oxygen atom, or a sulfur atom.

Abstract: It is an object of the present invention to provide an organic EL element including a capping layer constituted by two layers consisting of a first capping layer and a second capping layer that has a refractive index that is higher than that of the first capping layer, in order to improve the light extraction efficiency compared with an organic EL element including a capping layer constituted by a single layer. The present invention provides an organic electroluminescent element at least including an anode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode, and a capping layer arranged in this order, wherein the capping layer has a structure constituted by two layers consisting of a first capping layer and a second capping layer, a refractive index of the second capping layer is higher than a refractive index of the first capping layer throughout a wavelength range from 450 to 650 nm, and the second capping layer contains an arylamine compound having a specific structure.

Abstract: The present invention relates to an organic EL device having at least an anodic electrode, a hole transport layer, a light emitting layer, an electron transport layer, a cathodic electrode, and a capping layer in this order, in which the capping layer contains an amine compound having a benzazole ring structure represented by the following general formula (A-1).

Abstract: It is an object of the present invention to provide a compound for a capping layer that has a high refractive index and a low extinction coefficient in a range of 450 nm to 750 nm to improve the light extraction efficiency of an organic EL element. The present invention has focused on the fact that compounds having a benzene skeleton at the center thereof are excellent in stability and also durability in the form of a thin film, and that the refractive index thereof can be improved by modifying the molecular structure, and thus, molecules have been designed. Provided is a compound represented by a general formula (1), and an organic EL element with excellent luminance efficiency is obtained by using that compound as a constituent material of a capping layer.

Abstract: According to the present invention, there is provided an organic electroluminescence element including at least an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and a cathode in the stated order, the organic electroluminescence element being characterized in that: the hole injection layer contains an arylamine compound represented by the following general formula (1) and an electron acceptor. The organic EL element of the present invention has a high light emission efficiency and an excellent durability, as compared with the related art, while maintaining the existing low drive voltage.

Abstract: To provide an organic EL device having low driving voltage, high luminous efficiency, and particularly a long lifetime by combining various materials for an organic EL device having excellent hole and electron injection/transport performances, electron blocking ability, stability in a thin-film state, and durability as materials for an organic EL device having high luminous efficiency and high durability so as to allow the respective materials to effectively reveal their characteristics. In the organic EL device having at least an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode, in this order, the hole injection layer includes an arylamine compound of the following general formula (1) and a radialene derivative of the following general formula (2).

Abstract: An object of the present invention is to provide a compound with a high refractive index at a wavelength in range of 450 nm to 750 nm in a capping layer to improve light extraction efficiency of an organic EL device. The present invention was achieved by focusing on the fact that a heterocyclic compound has excellent thin film stability and durability and is able improve the refractive index by adjusting the molecular structures, and planning molecule, and an organic EL device having excellent luminous efficiency was obtained by using this compound as a material for constituting a capping layer.

Abstract: It is an object of the present invention to provide, as a material for a highly efficient and highly durable organic EL device, an organic compound with excellent properties including excellent hole-injecting/transporting performance, electron-blocking capability, and high stability in the form of a film. It is another object thereof to provide a highly efficient and highly durable organic EL device by using this compound. The present invention is directed to an arylamine compound represented by a general formula (1) below: where Ar1 and Ar2 represent a substituted or unsubstituted aromatic hydrocarbon group or the like, Ar3 and Ar4 represent a substituted or unsubstituted phenyl group or the like, L represents a substituted or unsubstituted divalent aromatic hydrocarbon group or the like, R1 to R3 represent a hydrogen atom, for example, and n is an integer of 1 to 2.

Abstract: [Problem] An object of the present invention is to provide a compound suitable for a low refractive index layer in a capping layer in order to improve the light extraction efficiency of an organic EL device. [Solution] The present invention was achieved by focusing on the fact that an adamantane compound has excellent thin film stability and finding that an amide compound, an ester compound, an amine compound, or an ether compound, in which adamantane is arranged at the center, exhibits a low refractive index property, and an organic EL device having excellent luminous efficiency was obtained by using this compound as a material for forming a capping layer having a low refractive index.

Abstract: The present disclosure is related to an organic EL element including a capping layer that contains a compound represented by formula (A-1). In the formula, A and X are monovalent groups represented by formula (B-1) having 1 binding site among R1 to R6. Z represents a monovalent group represented by formula (B-1) having 1 binding site among R1 to R6, an aromatic hydrocarbon group, an aromatic heterocyclic group or a fused polycyclic aromatic group. Ar is a single bond or a divalent group of an aromatic hydrocarbon group, an aromatic heterocyclic group, or a fused polycyclic aromatic group. R1 to R6 are each defined in the specification, and Q represents a nitrogen atom, an oxygen atom, or a sulfur atom.

Abstract: An objective of the present invention is to provide an organic EL device having high efficiency, low driving voltage and long lifetime by using a material for organic EL devices offering excellent hole injectability and transportability, electron blockability, stability in a thin-film state, and durability, and also by employing, in combination, the aforementioned material and various other materials for organic EL devices offering excellent hole/electron injectability and transportability, electron blockability, stability in a thin-film state, and durability, in a manner that the properties of each material can be brought out effectively. The present invention relates to an organic electroluminescence device having, between an anode and a cathode, at least a hole transport layer, a light-emitting layer, and an electron transport layer in this order from the anode side, wherein the hole transport layer contains a triarylamine compound having a specific structure.

Abstract: The present disclosure is related to an organic EL element including a capping layer that contains a compound represented by formula (A-1). In the formula, A and X are monovalent groups represented by formula (B-1) having 1 binding site among R1 to R6. Z represents a monovalent group represented by formula (B-1) having 1 binding site among R1 to R6, an aromatic hydrocarbon group, an aromatic heterocyclic group or a fused polycyclic aromatic group. Ar is a single bond or a divalent group of an aromatic hydrocarbon group, an aromatic heterocyclic group, or a fused polycyclic aromatic group. R1 to R6 each represent a linking group as a binding site, a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, a cyano group, a nitro group, a linear or branched alkyl group, a cycloalkyl group, an alkenyl group, an alkyloxy group, a cycloalkyloxy group, an aromatic hydrocarbon group, an aromatic heterocyclic group, a fused polycyclic aromatic group, or an aryloxy group.

Abstract: An objective of the present invention is to provide a material for organic EL devices offering excellent hole injectability and transportability, electron blockability, stability in a thin-film state, and durability, and also to provide an organic EL device having high efficiency, low driving voltage and long lifetime by employing, in combination, the aforementioned material and various materials for organic EL devices offering excellent hole/electron injectability and transportability, electron blockability, stability in a thin-film state, and durability, in a manner that the properties of each of the materials can be brought out effectively. The present invention relates to an organic EL device containing a specific arylamine compound as a material constituting a second hole transport layer, wherein the difference between the HOMO level of the second hole transport layer and the HOMO level of a first hole transport layer is 0.15 eV or less.

Abstract: The triarylamine compound having a specific structure in the present invention is excellent in hole injection/transport ability, stability and durability of thin film. By selecting the triarylamine compound having a specific structure as the material for the hole transport layer, holes injected from the anode side can be efficiently transported. Furthermore, various organic EL devices combining luminescent materials having a specific structure or the like exhibit good device characteristics. The triarylamine compound having a specific structure in the present invention is excellent in hole injection/transport ability, stability and durability of thin film. By selecting the triarylamine compound having a specific structure as the material for the hole transport layer, holes injected from the anode side can be efficiently transported. Furthermore, various organic EL devices combining luminescent materials having a specific structure or the like exhibit good device characteristics.