Abstract: A light-emitting device having high heat resistance in a manufacturing process is provided.

Abstract: A light-emitting device with a high resolution and favorable characteristics manufactured by a photolithography method is provided. In the light-emitting device, a first light-emitting device and a second light-emitting device are adjacent each other. The first light-emitting device includes a first EL layer, and the second light-emitting device includes a second EL layer. The first EL layer includes at least a first light-emitting layer and a first electron-transport layer, and the second EL layer includes at least a second light-emitting layer and a second electron-transport layer. The first electron-transport layer contains a first heteroaromatic compound and a first organic compound, and the second electron-transport layer contains a second heteroaromatic compound and a second organic compound.

Abstract: To provide a novel organometallic complex and a novel light-emitting device that are useful or reliable. The organometallic complex includes platinum (Pt), a cyano group, and a phenyl group that has two alkyl groups at the ortho-positions. The light-emitting device includes an organic compound layer held between a pair of electrodes; the organic compound layer includes a light-emitting layer; the light-emitting layer contains an organic compound and the organometallic complex; the organometallic complex includes platinum (Pt), a cyano group, and a phenyl group that has two alkyl groups at the ortho-positions; and the difference between the LUMO level of the organic compound and the HOMO level of the organometallic complex is greater than or equal to 2.5 eV and less than or equal to 3.0 eV.

Abstract: A novel organic compound is to be provided. In other words, a novel organic compound effective in improving element characteristics is to be provided. The organic compound is represented by General Formula (G1) shown below. In General Formula (G1) above, at least one or two of A1 to A4 represent nitrogen, and the others represent carbon. At least one or two of A5 to A8 represent nitrogen, and the others represent carbon. In addition, B1 and B2 each independently represent hydrogen, an alkyl group having 1 to 6 carbon atoms, or a cyano group. In addition, Htuni1 and Htuni2 each independently represent a hole-transport skeleton.

Abstract: A novel light-emitting device that is highly convenient, useful, or reliable is provided. The light-emitting device includes a first electrode, a second electrode, and a first layer. The first layer is positioned between the first electrode and the second electrode. The first layer includes a light-emitting material, a first organic compound, and a first material. The light-emitting material has a function of emitting fluorescent light. The absorption spectrum of the light-emitting material has the longest-wavelength edge at a first wavelength. The first organic compound has a function of converting triplet excitation energy into light emission. The spectrum of the emitted light has the shortest-wavelength edge at a second wavelength. The second wavelength is positioned at a wavelength shorter than the first wavelength. The first organic compound includes a first substituent R1. The first substituent R1 is any of an alkyl group, a substituted or unsubstituted cycloalkyl group, and a trialkylsilyl group.

Abstract: A light-emitting device with high heat resistance in a manufacturing process is to be provided.

Abstract: A light-emitting device with high heat resistance in a manufacturing process is to be provided.

Abstract: A novel mixed material with improved resistance is provided. The mixed material includes a first heteroaromatic compound and a second heteroaromatic compound, and the first heteroaromatic compound is represented by any one of General Formulae (G1) to (G6). The second heteroaromatic compound is not represented by the same general formula as that of the first heteroaromatic compound.

Abstract: A green phosphorescent light-emitting device with a long lifetime is provided. The light-emitting device includes a first electrode, a second electrode, and a light-emitting layer. The light-emitting layer is between the first electrode and the second electrode. The light-emitting layer includes a first organic compound, a second organic compound, and a phosphorescent light-emitting substance. The first organic compound includes a heteroaromatic ring skeleton and an aromatic hydrocarbon group. The second organic compound includes a bicarbazole skeleton. The lowest triplet excited level of the first organic compound is derived from only the aromatic hydrocarbon group. The energy of the lowest triplet excited level of the second organic compound is higher than or equal to 2.20 eV and lower than or equal to 2.65 eV.

Abstract: A light-emitting device includes a light-emitting layer containing a light-emitting substance and a first organic compound. The light-emitting substance is an organometallic complex containing a central metal and ligands. One of the ligands includes a skeleton formed by a ring A1 and a pyridine ring bonded to each other. The ring A1 represents an aromatic ring or a heteroaromatic ring. The pyridine ring includes an alkyl group having 1 to 6 carbon atoms and being substituted with deuterium. The first organic compound includes an electron-transport skeleton and first and second substituents that are bonded to the electron-transport skeleton. The electron-transport skeleton includes a heteroaromatic ring having two or more nitrogen atoms. The first substituent includes one or both of an aromatic ring and a heteroaromatic ring. The second substituent includes a skeleton having a hole-transport property.

Abstract: An increase in voltage of a light-emitting device manufactured through a step of forming an aluminum oxide film in contact with an organic compound layer is inhibited. An organic compound film is formed over a first electrode. An organic mask film containing an organic compound which has low solubility to water or a chemical solution including water as a solvent is formed over the organic compound film. An inorganic mask layer is formed over the organic mask film. Shapes of the organic mask film and the organic compound film are processed with the use of the inorganic mask layer, whereby an organic mask layer and an organic compound layer are formed. At least parts of the inorganic mask layer and the organic mask layer are removed with the use of water or a liquid including water as a solvent.

Abstract: An electron-injection organic compound with low solubility in water is provided. An organic compound represented by General Formula (G1) is provided. In the organic compound, Ar represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 carbon atoms forming a ring or a substituted or unsubstituted heteroaromatic hydrocarbon group having 2 to 30 carbon atoms forming a ring, each of R1 and R2 independently represents hydrogen (including deuterium), an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group having 6 to 13 carbon atoms forming a ring, or a substituted or unsubstituted heteroaryl group having 2 to 13 carbon atoms forming a ring, n represents an integer greater than or equal to 1 and less than or equal to 6, and L is the group represented by General Formula (L-1).

Abstract: An electron-injection organic compound capable of providing a high-performance semiconductor device, and a light-emitting device including the organic compound are provided. An organic compound represented by General Formula (G1) and a light-emitting device including the organic compound are provided. Note that in General Formula (G1), R1 to R8 each independently represent any of hydrogen, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 carbon atoms, a substituted or unsubstituted heteroaromatic hydrocarbon group having 2 to 30 carbon atoms, and a group represented by Structural Formula (R-1). Note that at least two of R1 to R8 each represent a group other than hydrogen, and one to four of R1 to R8 each represent the group represented by Structural Formula (R-1).

Abstract: A novel organic compound is provided. The organic compound is represented by General Formula (G1).

Abstract: An organic semiconductor device that can achieve high resolution and favorable reliability is provided. The organic semiconductor device is one of a plurality of light-emitting devices formed over an insulating layer, which includes a first electrode, a second electrode, and an organic compound layer. The organic compound layer is positioned between the first electrode and the second electrode. The organic compound layer includes a layer containing a first compound. When differential scanning calorimetry is performed on the first compound in such a manner that a cooling step is performed from the state in which the first compound is melted in a first heating step and a second heating step is successively performed, an exothermic peak is not observed in the cooling step and an exothermic peak and a melting point peak are not observed in the second heating step.

Abstract: A novel organometallic complex with high heat resistance is provided. The organometallic complex includes a structure represented by General Formula (G1) below, in which iridium and a ligand are included, the ligand includes a pyrazine skeleton, iridium is bonded to nitrogen at the 1-position of the pyrazine skeleton, an aryl group including a cyano group as a substituent is bonded at the 5-position of the pyrazine skeleton, and each of the 3-position and the 6-position of the pyrazine skeleton is independently bonded to any one of hydrogen, an alkyl group, and an alkoxy group. (In the formula, A represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 25 carbon atoms. In addition, Ar represents an aryl group having 6 to 25 carbon atoms and at least one cyano group as a substituent. Each of R1 and R2 independently represents any one of hydrogen, an alkyl group having 1 to 6 carbon atoms, and an alkoxy group having 1 to 6 carbon atoms.

Abstract: To inhibit an increase in voltage of an organic semiconductor device manufactured by a method including a step of forming an aluminum oxide film over and in contact with an organic semiconductor layer. An organic semiconductor device including a first electrode, a second electrode, an organic semiconductor layer, and a buffer layer is provided. The organic semiconductor layer is positioned between the first electrode and the second electrode. The buffer layer is positioned between the organic semiconductor layer and the second electrode. A side surface of the organic semiconductor layer and a side surface of the buffer layer are substantially aligned.

Abstract: A composition for a light-emitting device is provided. The composition is formed by mixing a first organic compound having a benzofuropyrimidine skeleton, and a second organic compound represented by General Formula (Q1): R1 to R14 each independently represent hydrogen, an alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted monocyclic saturated hydrocarbon having 5 to 7 carbon atoms in a ring, a substituted or unsubstituted polycyclic saturated hydrocarbon having 7 to 10 carbon atoms in a ring, a substituted or unsubstituted aryl group having 6 to 13 carbon atoms in a ring, or a substituted or unsubstituted heteroaryl group having 3 to 20 carbon atoms in a ring. Furthermore, ?1 and ?2 each represent any of an unsubstituted ?-naphthyl group, an unsubstituted biphenyl group, and an unsubstituted terphenyl group, and at least one of ?1 and ?2 is an unsubstituted ?-naphthyl group.

Abstract: A light-emitting device with high resistance to heat in a fabrication process is provided. The light-emitting device includes an EL layer between an anode and a cathode, and the EL layer includes at least a light-emitting layer. The light-emitting device includes, between the light-emitting layer and the cathode, a first layer in contact with the light-emitting layer. The light-emitting layer includes a light-emitting substance, a first organic compound, and a second organic compound. The first layer includes a third organic compound different from the first organic compound and the second organic compound. The light-emitting substance emits green to yellow light. The third organic compound includes a bicarbazole skeleton and a heteroaromatic ring skeleton including one selected from a pyridine ring, a diazine ring, and a triazine ring.

Abstract: A light-emitting device with high heat resistance is provided. The light-emitting layer device includes an anode, a cathode; and an EL layer between the anode and the cathode. The EL layer includes a light-emitting layer and a first layer. The first layer is between the light-emitting layer and the cathode. The light-emitting layer is in contact with the first layer. The light-emitting layer includes a first organic compound and a light-emitting substance. The first layer includes a second organic compound. The light-emitting substance is a substance that emits blue light. The first organic compound is an organic compound including a fused aromatic hydrocarbon ring. The second organic compound is an organic compound including a heteroaromatic ring skeleton including one selected from a pyridine ring, a diazine ring, and a triazine ring; and a bicarbazole skeleton.