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 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 light-receiving device that is highly convenient, useful, or reliable is provided. A light-receiving device including a light-receiving layer (203) between a pair of electrodes (201, 202) is provided. The light-receiving layer 203 includes an active layer. The active layer includes a first organic compound. An SP value of the first organic compound is greater than or equal to 9.0 [(cal/cm3)1/2] and less than or equal to 11.0 [(cal/cm3)1/2]. Alternatively, a light-receiving device including a light-receiving layer (203) between a pair of electrodes (201, 202) is provided. The light-receiving layer (203) includes an active layer. The active layer includes a first organic compound. An absolute value of a difference in an SP value between the first organic compound and an oxygen-containing solvent except for alcohol is less than or equal to 1.0 [(cal/cm3)1/2].

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: The light-emitting device includes a first electrode, a second electrode, a first unit between the first electrode and the second electrode, and a first layer between the second electrode and the first unit. The first unit contains a first light-emitting material. The first layer includes a second layer and a third layer. The second layer is positioned between the third layer and the first unit. The second layer contains a first organic compound and a second organic compound. The first organic compound has an acid dissociation constant pKa larger than or equal to 8. The second organic compound includes no pyridine ring, no phenanthroline ring, or one phenanthroline ring. The third layer contains a material having a spin density higher than or equal to 1×1018 spins/cm3 observed by electron spin resonance spectroscopy when the material is in a film state.

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: Provided is a novel light adjustment program that can make a human feel at ease. Provided is the light adjustment program that includes the steps of obtaining basic data having 1/f fluctuation characteristics; generating first smoothed data and second smoothed data by performing moving average processing with different periods on the basic data having 1/f fluctuation characteristics; generating light adjustment data by subjecting the first smoothed data and the second smoothed data to arithmetic processing; and changing luminance of a light-emitting device in time series in accordance with the light adjustment data.

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, a first unit, and a first layer. The first unit is positioned between the first electrode and the second electrode and contains a first light-emitting material. The first layer is positioned between the second electrode and the first unit and contains a first organic compound and a second organic compound. The first organic compound has an acid dissociation constant pKa larger than or equal to 8, and the second organic compound has no pyridine ring, no phenanthroline ring, or one phenanthroline 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 novel light-emitting device that is highly convenient, useful, or reliable is provided. The light-emitting device includes a first electrode, a second electrode, a first unit, a second unit, and a first intermediate layer. The first unit is between the first electrode and the second electrode. The first unit contains a first light-emitting material. The second unit is between the first unit and the second electrode. The second unit contains a second light-emitting material. The first intermediate layer is between the first unit and the second unit. The first intermediate layer contains a first organic compound and a second organic compound. The first organic compound has an acid dissociation constant pKa larger than or equal to 8. The second organic compound has an acid dissociation constant pKa smaller than 4.

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 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.

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.