Abstract: Disclosed is a composition containing a compound having a benzotriazole ring structure and a phosphorescent compound.

Abstract: Disclosed is a composition comprising a compound having a pyrazine ring structure and a phosphorescent compound, wherein the compound having a pyrazine ring structure has a pyrazine ring structure represented by the general formula (1), (2) or (3): wherein R and R1 independently represent a hydrogen atom or a univalent group and multiple R's and multiple R1's may be the same as or different from one another. Also disclosed is a polymer having a residue derived from the phosphorescent compound and the pyrazine ring structure.

Abstract: Disclosed is a composition containing a compound having a benzimidazole ring structure and a phosphorescent compound.

Abstract: Disclosed is a composition containing a compound having an indazole ring structure and a phosphorescent compound.

Abstract: A composition which comprises a compound having a pyrimidine ring structure and a phosphorescent compound.

Abstract: Disclosed is a metal complex represented by the following formula (1). In the formula, M represents a metal atom; R1-R8 respectively represent a hydrogen atom, a halogen atom or a monovalent group; or alternatively R3 and R4, or R5 and R6 may combine together to form a ring.

Abstract: A polynuclear complex having two or more metal atoms and/or metal ions per one ligand of the general formula (I): (wherein, Q1 and Q2 represent each independently a divalent heterocyclic group optionally having a substituent.

Abstract: A metal complex having a structure of the following general formula (1): (wherein, X1 and X2 represent independently a carbon atom or nitrogen atom. Bonds represented by X1C and X2N are a single bond or double bond. M represents a transition metal atom. A dihedral angle defined by a plane containing a structure represented by CX1—X2 and a plane containing a structure represented by X1—X2N is 9° to 16°, and the proportion of the sum of squares of orbital coefficients of the outermost d orbital of the metal atom M, in the highest occupied molecular orbital of the metal complex, occupying with respect to the sum of squares of all atom orbital coefficients, is divided by an energy difference S1?T1 between the lowest excitation singlet energy S1 and the lowest excitation triplet energy T1 of the metal complex, to give a value of 200 to 600%/eV.).

Abstract: This invention provides a luminescent composition comprising a polymer and at least one phosphorescent compound, characterized in that the electronic conjunction chain coefficient Ze of the main repeating minimum unit of the polymer falls within the following range: 0<Ze?2.00 (1) wherein the electronic conjunction chain coefficient Ze is defined as a slope obtained by linear approximation of function Tm=Tm(1/ne) by the least square method wherein ne represents the number of conjugated electrons contained in repeating minimum units; and Tm represents, for m-mer obtained by bonding repeating minimum units, the lowest triplet excitation energy in each m-mer when the number m is varied from 1 to 3 by one by one. Here in the number of conjugated electrons, only the conjugated electrons present in the main chain of the repeating minimum units are taken into consideration, provided that, when there are a plurality of main repeating minimum units, the minimum Ze is used.

Abstract: A light emitting material comprising a conjugated polymer compound (A) containing an aromatic ring in the main chain and a compound (B) showing light emission from the triplet excited state, wherein an energy difference between the vacuum level and the lowest unoccupied orbital (LUMO) level in the ground state, calculated by a computational chemical means, is 1.3 eV or more, or an energy difference between the vacuum level and the lowest unoccupied orbital (LUMO) level in the ground state, experimentally measured, is 2.2 eV or more, in the polymer compound (A), and either the following (Condition 1) or the following (Condition 2) or both of them are satisfied.

Abstract: A polymer compound comprising in the same molecule a structure of (A) a conjugated polymer and a structure of (B) a metal complex having at least one tridentate ligand and having a central metal of which atomic number is 21 or more.