Abstract: Provided is a light-emitting device comprising: an anode; a cathode; a first organic layer disposed between the anode and the cathode; and a second organic layer disposed, adjacently to the first organic layer, between the anode and the cathode, wherein: the first organic layer is a layer containing a fluorescent low-molecular compound; the second organic layer is a layer containing a cross-linked form of a polymer compound comprising a cross-linking constitutional unit having a cross-linking group; and the average number of cross-linking groups per molecular weight 1000 in the polymer compound is 0.60 or more.

Abstract: A light emitting device comprising an anode, a cathode, a first light emitting layer between the anode and the cathode, and a second light emitting layer between the anode and the cathode is provided. The first light emitting layer comprises a metal complex represented by formula (1): In formula (1), M1 represents an iridium atom, n1 represents an integer of 1 or more, n2 represents an integer of 0 or more, n1+n2 is 2 or 3, ring R1A represents a triazole ring containing a nitrogen atom, E1, E11A, E12A, and a carbon atom, ring R2 represents an aromatic hydrocarbon ring, E1, E2, E11A, and E12A each represent a nitrogen atom, R11A and R12A represent an aryl group, R13A represents an aryl group, A1-G1-A2 represents an anionic bidentate ligand, A1 and A2 each represent a nitrogen atom, and G1 represents a single bond.

Abstract: A composition is provided containing: a phosphorescent compound having an emission spectrum whose maximum peak wavelength is between 380 nm or more and less than 495 nm, having no dendron and represented by formula (1?); two or more phosphorescent compounds having an emission spectrum whose maximum peak wavelength is between 495 nm or more and less than 750 nm and having a dendron; and a compound represented by formula (H-1). In formula (1?) M represents an iridium atom or the like, n1 represents an integer of 1 or more, n2 represents an integer of 0 or more, E1 and E2 represent a carbon atom or the like, the ring R1? represents a diazole ring, the ring R2 represents a 6-membered aromatic hydrocarbon ring or the like, and A1-G1-A2 represents an anionic bidentate ligand.

Abstract: A composition is provided containing a first phosphorescent compound (DB) having an emission spectrum whose maximum peak wavelength is from 400 nm to less than 480 nm and having a dendron and a second phosphorescent compound (DGR) having an emission spectrum whose maximum peak wavelength is from 480 nm to less than 680 nm and having a dendron.

Abstract: A light emitting device includes an anode, a cathode, and first and second organic layers disposed between the anode and the cathode. The first organic layer is a layer obtained by using a composition including a compound represented by the formula (H-A) and a metal complex represented by the formula (1). The second organic layer is a layer obtained by using a polymer compound including a constitutional unit having a cross-linkable group. wherein the atoms, groups and rings in formulas (H-A) and (1) are defined in the specification.

Abstract: A composition is provided containing: a phosphorescent compound having an emission spectrum whose maximum peak wavelength is between 380 nm or more and less than 495 nm, having no dendron and represented by formula (1?); two or more phosphorescent compounds having an emission spectrum whose maximum peak wavelength is between 495 nm or more and less than 750 nm and having a dendron; and a compound represented by formula (H-1). In formula (1?) M represents an iridium atom or the like, n1 represents an integer of 1 or more, n2 represents an integer of 0 or more, E1 and E2 represent a carbon atom or the like, the ring R1? represents a diazole ring, the ring R2 represents a 6-membered aromatic hydrocarbon ring or the like, and A1-G1-A2 represents an anionic bidentate ligand.

Abstract: A composition is provided containing a first phosphorescent compound (DB) having an emission spectrum whose maximum peak wavelength is from 400 nm to less than 480 nm and having a dendron and a second phosphorescent compound (DGR) having an emission spectrum whose maximum peak wavelength is from 480 nm to less than 680 nm and having a dendron.