Abstract: A novel compound and a light-emitting element with high emission efficiency and a long lifetime are provided. The novel compound includes a benzofuropyrazine skeleton or a benzothienopyrazine skeleton, and each of a benzene ring and a pyrazine ring in the benzofuropyrazine skeleton or the benzothienopyrazine skeleton independently includes a substituent with a total number of carbon atoms of 6 to 100 inclusive. The light-emitting element includes the compound.

Abstract: A benzofuropyrimidine derivative or benzothienopyrimidine derivative that is a novel organic compound is provided. An organic compound represented by General Formula (G1) below. Q represents oxygen or sulfur. Ar1, Ar2, Ar3, and Ar4 each independently represent an aromatic hydrocarbon ring, and the number of carbon atoms included in the aromatic hydrocarbon ring is 6 to 25. m and n are each 0 or 1. A is a group having 12 to 100 carbon atoms in total and includes one or more of a benzene ring, a naphthalene ring, a fluorene ring, a phenanthrene ring, a triphenylene ring, a heteroaromatic ring including a dibenzothiophene ring, a heteroaromatic ring including a dibenzofuran ring, a heteroaromatic ring including a carbazole ring, a benzimidazole ring, and a triphenylamine structure.

Abstract: A light-emitting element that includes a fluorescent material and has a high emission efficiency is provided. A light-emitting element in which a delayed fluorescence component due to TTA accounts for a high proportion of emissive components is provided. A novel light-emitting device with a high emission efficiency and a low power consumption is provided. A light-emitting element includes an anode, a cathode, and an EL layer. The EL layer includes a light-emitting layer including a host material and an electron-transport layer including a first material in contact with the light-emitting layer. The LUMO level of the first material is lower than that of the host material. The proportion of a delayed fluorescence component due to TTA is greater than or equal to 10 percent of the light emission from the EL layer. The proportion of the delayed fluorescence component due to TTA may be greater than or equal to 15 percent of the light emission.

Abstract: An object is to provide a novel composition for an EL device. Another object of one embodiment of the present invention is to provide a composition for an EL device capable of easily manufacturing an EL device with stable characteristics. Another object of one embodiment of the present invention is to provide a composition for an EL device capable of manufacturing an EL device with stable characteristics at low cost. The present inventors have studied a composition for an EL device in which different substances are mixed in advance and which does not cause change in characteristics of the EL device even when evaporation is repeated with use of the composition. As a result, a composition for an EL device in which a difference in the 5% weight loss temperature under a pressure lower than or equal to 0.1 Pa between contained substances is less than or equal to 50° C. is provided.

Abstract: A novel organic compound, a benzofuropyrimidine derivative or a benzothienopyrimidine derivative is provided. The organic compound has a structure in which a benzothienocarbazolyl ring, a benzofurocarbazolyl ring, an indolocarbazolyl ring, or an indenocarbazolyl ring is bonded to the 8-position of a benzofuropyrimidine ring or a benzothienopyrimidine ring directly or through an aromatic hydrocarbon ring. That is, the organic compound is represented by General Formula (G1) below.

Abstract: A novel compound and a light-emitting element with high emission efficiency and a long lifetime are provided. The novel compound includes a benzofuropyrazine skeleton or a benzothienopyrazine skeleton, and each of a benzene ring and a pyrazine ring in the benzofuropyrazine skeleton or the benzothienopyrazine skeleton independently includes a substituent with a total number of carbon atoms of 6 to 100 inclusive. The light-emitting element includes the compound.

Abstract: A novel organic compound is provided. That is, a novel organic compound that is effective in improving element characteristics and reliability is provided. The organic compound is represented by General Formula (G1) having a dibenzobenzofuroquinoxaline skeleton or a dibenzobenzothienoquinoxaline skeleton. In General Formula (G1), Q represents O or S, at least one of R1 to R12 represents a first group having a substituted or unsubstituted condensed aromatic ring or condensed heteroaromatic ring having 3 to 30 carbon atoms, and the other or others of R1 to R12 each independently represent any one of hydrogen, a halogeno group, a hydroxy group, an amino group, a nitro group, and a group having 1 to 50 carbon atoms.

Abstract: A benzofuropyrimidine derivative or benzothienopyrimidine derivative that is a novel organic compound is provided. An organic compound represented by General Formula (G1) below. Q represents oxygen or sulfur. Ar1, Ar2, Ar3, and Ar4 each independently represent an aromatic hydrocarbon ring, and the number of carbon atoms included in the aromatic hydrocarbon ring is 6 to 25. m and n are each 0 or 1. A is a group having 12 to 100 carbon atoms in total and includes one or more of a benzene ring, a naphthalene ring, a fluorene ring, a phenanthrene ring, a triphenylene ring, a heteroaromatic ring including a dibenzothiophene ring, a heteroaromatic ring including a dibenzofuran ring, a heteroaromatic ring including a carbazole ring, a benzimidazole ring, and a triphenylamine structure.

Abstract: A light-emitting device having high emission efficiency, reliability, and color purity is provided. The light-emitting device 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 light-emitting layer; the light-emitting layer includes a first substance and a second substance; the first substance emits light from a doublet excited state; a doublet excited level of the first substance is lower than a singlet excited level of the second substance and higher than a triplet excited level of the second substance; and the first substance emits light.

Abstract: A light-emitting element that includes a fluorescent material and has a high emission efficiency is provided. A light-emitting element in which a delayed fluorescence component due to TTA accounts for a high proportion of emissive components is provided. A novel light-emitting device with a high emission efficiency and a low power consumption is provided. A light-emitting element includes an anode, a cathode, and an EL layer. The EL layer includes a light-emitting layer including a host material and an electron-transport layer including a first material in contact with the light-emitting layer. The LUMO level of the first material is lower than that of the host material. The proportion of a delayed fluorescence component due to TTA is greater than or equal to 10 percent of the light emission from the EL layer. The proportion of the delayed fluorescence component due to TTA may be greater than or equal to 15 percent of the light emission.

Abstract: A light-emitting device with high heat resistance in a fabrication process is provided. The light-emitting device includes a light-emitting layer and a first layer between a first electrode and a second electrode. The first layer is positioned between the light-emitting layer and the second electrode and is in contact with the light-emitting layer. The light-emitting layer contains a light-emitting substance, a first organic compound, and a second organic compound. The first layer contains a third organic compound different from the first organic compound and the second organic compound. The light-emitting substance emits blue phosphorescent light. The third organic compound includes a bicarbazole skeleton and a heteroaromatic ring skeleton having one selected from a pyridine ring, a diazine ring, and a triazine ring.

Abstract: A novel organic compound is provided. The organic compound is represented by General Formulae (G1), (u1), and (g1), where Ar represents a substituted or unsubstituted condensed aromatic ring, one of R1 and R2 represents a group represented by General Formula (u1), and any one of R30 to R40 represents a bond. In addition, A is a group represented by General Formula (g1), and B represents a substituted or unsubstituted phenyl group. Moreover, n is an integer of 0 to 2, and Q1 and Q2 independently represent an oxygen atom or a sulfur atom.

Abstract: A novel organic compound is provided. That is, a novel organic compound that is effective in improving the element characteristics and reliability is provided. The organic compound has a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton and is represented by General Formula (G1). Note that in General Formula (G1), Q represents oxygen or sulfur; ? represents a substituted or unsubstituted arylene group having 6 to 13 carbon atoms; n represents an integer of 0 to 4; A1 represents a group including an aryl group or a heteroaryl group and having 6 to 100 carbon atoms; R1 to R4 independently represent any one of hydrogen, a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 7 carbon atoms, and a substituted or unsubstituted aryl group having 6 to 13 carbon atoms; and A2 represents a condensed ring.

Abstract: A novel organic compound, a benzofuropyrimidine derivative or a benzothienopyrimidine derivative is provided. The organic compound has a structure in which a benzothienocarbazolyl ring, a benzofurocarbazolyl ring, an indolocarbazolyl ring, or an indenocarbazolyl ring is bonded to the 8-position of a benzofuropyrimidine ring or a benzothienopyrimidine ring directly or through an aromatic hydrocarbon ring. That is, the organic compound is represented by General Formula (G1) below.

Abstract: A highly efficient and highly reliable light-emitting device is provided. The light-emitting device includes an organic compound layer between a pair of electrodes. The organic compound layer includes a light-emitting layer, the light-emitting layer includes a first organic compound, a second organic compound, and a light-emitting substance, the first organic compound contains deuterium, and in a PL measurement of a mixed layer of the first organic compound and the second organic compound, a spectrum of an exciplex is observed at room temperature, and a spectrum of the exciplex is not observed at a temperature in a temperature range of 4 K to 80 K, inclusive.

Abstract: A novel organometallic complex and a novel light-emitting device that are highly useful or reliable are provided. The organometallic complex represented by General Formula (G1) is provided. Note that R1, R2, and R4 to R22 each independently represent hydrogen (including deuterium), an alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, at least one of R2 and R4 represents an alkyl group having 1 to 10 carbon atoms, and any one or more of R18 to R22 represent an alkyl group having 3 to 10 carbon atoms or a substituted or unsubstituted aryl group having 6 to 18 carbon atoms.

Abstract: A novel organometallic complex that is highly convenient, useful, or reliable, and a light-emitting device are provided. The organometallic complex is represented by General Formula (G2). In General Formula (G2), each of R1 to R6, R8 to R22, and R31 to R34 independently represents hydrogen (including deuterium), an alkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, at least one of R31 to R34 represents an alkyl group having 1 to 10 carbon atoms or a substituted or unsubstituted aryl group having 6 to 18 carbon atoms, and n is an integer of 1 to 4.

Abstract: A highly efficient light-emitting device is provided. The light-emitting device includes a light-emitting layer between a first electrode and a second electrode. The light-emitting layer includes at least a light-emitting substance and a first substance, the half width of an emission spectrum of the light-emitting substance is 0.35 eV or less, the luminescence lifetime of delayed fluorescence caused by photoexcitation of the first substance is shorter at a first temperature than at a second temperature, the first temperature is lower than the second temperature, and the first temperature and the second temperature are each higher than or equal to 10 K and lower than or equal to 300 K.

Abstract: A light-emitting device with favorable carrier balance is provided. The light-emitting device includes a light-emitting layer between a first electrode and a second electrode. The light-emitting layer includes at least a first substance and a light-emitting substance, the first substance includes an organic compound having one or more of a carbazole ring, an aromatic amine skeleton, and a ?-electron deficient heteroaromatic ring, a luminescence lifetime of delayed fluorescence caused by photoexcitation of the light-emitting substance is shorter at a first temperature than at a second temperature, the first temperature is lower than the second temperature, and the first temperature and the second temperature are each higher than or equal to 10 K and lower than or equal to 300 K.

Abstract: A light-emitting device with high emission efficiency, reliability, and color purity is to be provided. The light-emitting device includes a first electrode, a second electrode, and an organic compound layer. The organic compound layer is between the first electrode and the second electrode and includes a light-emitting layer. The light-emitting layer includes a first substance and a second substance. The second substance causes light emission from a doublet excited state. The doublet excited level of the second substance is lower than the singlet excited level of the first substance and is higher than the triplet excited level of the first substance. The second substance emits light.