Abstract: To provide a novel photoelectric conversion device that is highly convenient, useful, or reliable. The photoelectric conversion device includes a first electrode, a second electrode, and a first unit. The first unit is located between the first electrode and the second electrode. The first unit contains a first electron-donating material and a first electron-accepting material. The first electron-donating material is a condensed aromatic compound, and the first electron-accepting material has a perylene skeleton and two or more alkyl groups. The alkyl groups each independently have 1 to 13 carbon atoms.

Abstract: A novel and highly convenient, useful, or reliable material for a photoelectric conversion device is provided. The photoelectric conversion device includes a first electrode, a second electrode, a first layer, a second layer, and a third layer. The first layer is held between the first electrode and the second electrode; the second layer is held between the second electrode and the first layer; the third layer is held between the second electrode and the second layer; and the third layer has higher electron mobility than the first layer. The material is used in the second layer, the material contains an anthracene skeleton, and the anthracene skeleton is bonded to a diarylamino group, a diheteroarylamino group, or an arylheteroarylamino group.

Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device with favorable emission efficiency is provided. Alternatively, a light-emitting device with a favorable lifetime is provided. Alternatively, a light-emitting device with a low driving voltage is provided. Provided is a light-emitting device including an anode, a cathode, and a layer including an organic compound that is positioned between the anode and the cathode, in which the layer including the organic compound includes a first layer, a second layer, and a light-emitting layer in this order from the anode side, the first layer includes a first substance and a second substance, the second layer includes a third substance, the first substance is an organic compound a HOMO level of which is higher than or equal to ?5.8 eV and lower than or equal to ?5.

Abstract: A novel photoelectric conversion device that is highly convenient, useful, or reliable is provided. A photoelectric conversion device (550S) includes a first electrode (551S), a second electrode (552S), and a unit (103S); the unit (103S) is interposed between the first electrode (551S) and the second electrode (552S); the unit (103S) includes a first layer (113) and a second layer (114S); and the first layer (113) is interposed between the second electrode (552S) and the second layer (114S). The first layer (113) contains a first organic compound ETM, the first organic compound ETM has an electron-transport property, and the first organic compound ETM has a LUMO level in a first level LUMO1. The second layer (114S) contains a second organic compound CTM, the second organic compound CTM emits delayed fluorescent light at room temperature, and the second organic compound CTM has a LUMO level in a second level LUMO2.

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: An object of one embodiment of the present invention is to provide a novel organic compound. The organic compound is a triarylamine derivative. The triarylamine derivative has an aryl group including a skeleton in which a naphthyl group is bonded to a naphthylene group. The other two aryl groups are each independently a phenyl group, a biphenyl group, or a terphenyl group. These groups may each have a substituent. As the substituent, an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms can be selected.

Abstract: A light-receiving device with a novel structure is provided. The provided light-receiving device includes a light-receiving layer between a pair of electrodes. The light-receiving layer includes an active layer. The active layer contains a first organic compound and a second organic compound. An absorption spectrum of the first organic compound has one or more peaks. At least one peak wavelength of the peaks is greater than or equal to 400 nm and less than or equal to 700 nm. The HOMO level of the second organic compound is higher than the HOMO level of the first organic compound. The difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is preferably higher than or equal to 0.2 eV and lower than or equal to 1.5 eV and further preferably higher than or equal to 0.4 eV and lower than or equal to 1.5 eV.

Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device with favorable emission efficiency is provided. Alternatively, a light-emitting device with a favorable lifetime is provided. Alternatively, a light-emitting device with a low driving voltage is provided. Provided is a light-emitting device including an anode, a cathode, and a layer including an organic compound that is positioned between the anode and the cathode, in which the layer including the organic compound includes a first layer, a second layer, and a light-emitting layer in this order from the anode side, the first layer includes a first substance and a second substance, the second layer includes a third substance, the first substance is an organic compound a HOMO level of which is higher than or equal to ?5.8 eV and lower than or equal to ?5.

Abstract: An object of one embodiment of the present invention is to provide a novel organic compound. The organic compound is a triarylamine derivative. The triarylamine derivative has an aryl group including a skeleton in which a naphthyl group is bonded to a naphthylene group. The other two aryl groups are each independently a phenyl group, a biphenyl group, or a terphenyl group. These groups may each have a substituent. As the substituent, an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms can be selected.

Abstract: An optical device with favorable characteristics is provided. An optical device with low driving voltage is provided. An optical device with low power consumption is provided. The optical device includes a first electrode, a second electrode, an active layer, and a carrier-transport layer. The active layer is positioned between the first electrode and the second electrode. The active layer contains a first organic compound and a second organic compound, the first organic compound is represented by General Formula (G1), and the second organic compound is represented by General Formula (G2-1). The carrier-transport layer is positioned between the second electrode and the active layer and the thickness of the carrier-transport layer is greater than or equal to 10 nm and less than or equal to 300 nm.

Abstract: A light-emitting element with high emission efficiency and high reliability is provided. The light-emitting element includes a host material and a guest material in a light-emitting layer. The host material has a function of converting triplet excitation energy into light emission and the guest material emits fluorescence. The molecular structure of the guest material is a structure including a luminophore and protecting groups, and five or more protecting groups are included in one molecule of the guest material. The introduction of the protecting groups into the molecule inhibits energy transfer of triplet excitation energy by the Dexter mechanism from the host material to the guest material. As the protecting group, an alkyl group or a branched-chain alkyl group is used.

Abstract: A novel organic compound that is highly convenient, useful, or reliable is provided. The organic compound is represented by General Formula (G1). Note that R1 to R4 each independently represent hydrogen (including deuterium), a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, or a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms; Ar1 is represented by General Formula (g1-1) below; Ar2 represents a substituted or unsubstituted aryl group having 10 to 30 carbon atoms or a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms; Ar3 is represented by General Formula (g1-2) below; ? represents a substituted or unsubstituted arylene group having 6 to 30 carbon atoms; and n represents an integer of 0 to 4.

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 organic compound having an emission spectrum peak at a wavelength longer than 850 nm and an absorption spectrum peak at a wavelength longer than 600 nm is provided. The organic compound is represented by General Formula (G1). In General Formula (G1), Ar1 to Ar4 each independently represent an aryl group having 6 to 13 carbon atoms in a ring. R1 to R8 each independently represent anyone of hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, an aryl group having 6 to 13 carbon atoms in a ring, and a heteroaryl group having 3 to 13 carbon atoms in a ring. Q1 and Q2 each independently represent a group having a carbazole skeleton or a group having a triarylamine skeleton and having 18 to 30 carbon atoms in a ring. Furthermore, m and n each independently represent 0 or 1.

Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device with favorable emission efficiency is provided. Alternatively, a light-emitting device with a favorable lifetime is provided. Alternatively, a light-emitting device with a low driving voltage is provided. Provided is a light-emitting device including an anode, a cathode, and a layer including an organic compound that is positioned between the anode and the cathode, in which the layer including the organic compound includes a first layer, a second layer, and a light-emitting layer in this order from the anode side, the first layer includes a first substance and a second substance, the second layer includes a third substance, the first substance is an organic compound a HOMO level of which is higher than or equal to -5.8 eV and lower than or equal to -5.

Abstract: A novel organic compound that is highly convenient, useful, or reliable is provided. An organic compound represented by General Formula (G1) is provided. In General Formula (G1), D1 represents a thiophene-diyl group, a furan-diyl group, a thiophene-containing heteroarylene group, or a furan-containing heteroarylene group; Ar1 and Ar2 each independently represent a heteroarylene group or an arylene group; A1 and A2 each independently represent hydrogen, deuterium, a nitro group, an alkyl group, a halogen, an alkyl halide group, a cyano group, an alkoxy group, a vinyl group, or a formyl group; n1 represents an integer of 1 or more; and m1 and k1 each independently represent an integer of 0 to 3.

Abstract: An organic compound with high heat resistance is provided. A light-emitting device with high emission efficiency and high reliability is provided. An organic compound represented by General Formula (G0) is provided. In General Formula (G0), any one of R1 to R5 represents General Formula (A), and each of the others of R1 to R5, R6 to R13, R21 to R29, R31 to R39, and R41 to R48 independently represents hydrogen, an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 13 carbon atoms. R21 and R22 may be bonded to each other to form a spiro ring.

Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device with favorable emission efficiency is provided. Alternatively, a light-emitting device with a favorable lifetime is provided. Alternatively, a light-emitting device with a low driving voltage is provided. Provided is a light-emitting device including an anode, a cathode, and a layer including an organic compound that is positioned between the anode and the cathode, in which the layer including the organic compound includes a first layer, a second layer, and a light-emitting layer in this order from the anode side, the first layer includes a first substance and a second substance, the second layer includes a third substance, the first substance is an organic compound a HOMO level of which is higher than or equal to ?5.8 eV and lower than or equal to ?5.

Abstract: Provided is a highly convenient, useful, or reliable novel organic compound represented by General Formula (G1), where A1 represents any of hydrogen, deuterium, an alkyl group having 1 to 13 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 25 carbon atoms, a heteroaryl group having 2 to 25 carbon atoms, and a diarylamino group; Ar1 to Ar4 each independently represent any of an aryl group having 6 to 25 carbon atoms, a heteroaryl group having 2 to 25 carbon atoms, and a diarylamino group; and R1 to R6 each independently represent any of hydrogen, deuterium, an alkyl group having 1 to 13 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an aryl group having 6 to 25 carbon atoms, a heteroaryl group having 2 to 25 carbon atoms, and an alkoxy group having 1 to 13 carbon atoms.

Abstract: A light-receiving device in which an increase in driving voltage is inhibited is provided. Any of the following light-receiving devices is provided: a light-receiving device that includes a light-receiving layer between a pair of electrodes and in which the light-receiving layer includes an active layer, a buffer layer, and an electron-transport layer, the buffer layer is between the active layer and the electron-transport layer and is in contact with the active layer, and the buffer layer includes an organic compound having an electron-withdrawing group; a light-receiving device that includes a light-receiving layer between a pair of electrodes and in which the light-receiving layer includes an active layer, a buffer layer, and an electron-transport layer, the buffer layer is between the active layer and the electron-transport layer and is in contact with the active layer, and the buffer layer includes a heteroaromatic compound having an electron-withdrawing group.