Abstract: An organic electroluminescent device having a pair of electrodes and at least one organic layer interposed between the pair of electrodes, in which the at least one organic layer contains at least one compound represented by formula (I): wherein, Z1 and Z2 each independently represent a nitrogen-containing aromatic six-membered ring coordinated to the platinum through a nitrogen atom; Q1 represents a group of atoms necessary for forming, together with the —C—C—, a nitrogen-containing aromatic five-membered ring; and L1 represents a single bond or a divalent linking group.

Abstract: An organic electroluminescent device is provided and includes: a pair of electrodes; and an organic compound layer between the pair of electrodes, the organic compound layer including a light-emitting layer. The at least one organic compound layer contains at least one of a compound represent by formula (I) and a compound represented by formula (II).

Abstract: A light-emitting element having excellent light-emitting properties and with which it is possible to emit blue light at a high luminance for a long period of time, and an iridium complex for realizing the same. The light-emitting element has an external quantum efficiency of at least 5% and a light emission maximum wavelength ? max of no more than 500 nm. Further, there is provided a light-emitting element including a light-emitting layer or a plurality of organic compound layers having the light-emitting layer, with at least one of the compound layers including at least one kind of a compound having a partial structure represented by the general formula K-0. In the general formula K-0, R1 to R7 each independently represents a hydrogen atom or a substituent, provided that if R2 is a fluorine atom, R3 is not a hydrogen atom.

Abstract: An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer, wherein the light emitting layer contains a phosphorescent material and a compound represented by the formula (I) as defined herein.

Abstract: An organic electroluminescent device having a pair of electrodes and at least one organic layer including a light-emitting layer interposed between the pair of electrodes, in which the organic layer contains at least one compound represented by formula (I): wherein Z1 and Z2 each independently represent a nitrogen-containing heterocycle coordinated with the platinum through a nitrogen atom; Q1 and Q2 each independently represent a group bonded with the platinum through a carbon atom, an oxygen atom, a sulfur atom, a nitrogen atom or a phosphorous atom; Q1 and Q2 each represent a structure different from each other; L1 and L2 each independently represent a single bond or a linking group; and n represents 0 or 1.

Abstract: A light-emitting element having excellent light-emitting properties and with which it is possible to emit blue light at a high luminance for a long period of time, and an iridium complex for realizing the same. The light-emitting element has an external quantum efficiency of at least 5% and a light emission maximum wavelength ?max of no more than 500 nm. Further, there is provided a light-emitting element including a light-emitting layer or a plurality of organic compound layers having the light-emitting layer, with at least one of the compound layers including at least one kind of a compound having a partial structure represented by the general formula K-0.

Abstract: An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer, wherein the light emitting layer contains at least one host material and at least one luminescent material, and the host material is a metal complex containing a metal in groups 4 to 11 or periods 5 to 6 of a Periodic Table.

Abstract: An organic electroluminescent device comprises: a pair of electrodes; and at least one organic compound layer therebetween, the at least one organic compound layer comprises at least a light-emitting layer, wherein at least one of the at least one organic compound layer comprises at least one compound represented by formula (1): Formula (1): wherein Q1 to Q4 each independently represents an atomic group for forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring in combination with two carbon atoms in formula (1); A1 and A2 each independently represents a carbon atom or a nitrogen atom; and Q5 and Q6 each independently represents an atomic group for forming an aromatic hydrocarbon ring or an aromatic heterocyclic ring in combination with A1 and A2 respectively, provided that Q5 and Q6 are not combined through a single bond, a divalent aromatic hydrocarbon ring group or a divalent aromatic heterocyclic ring group.

Abstract: An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer, wherein the light emitting layer contains at least one host material and at least one luminescent material, and the host material is a compound represented by the formula (I) as defined herein.

Abstract: An organic electroluminescent device comprising a pair of electrodes and a light emitting layer, a hole transport layer containing a hole transporting material, and an electron transport layer provided between the pair of electrodes wherein, the light emitting layer contains at least two host materials and at least one red phosphorescent material, and the hole transporting material in the hole transport layer has a small ionization potential than the two host materials in the light emitting layer.

Abstract: An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer, wherein the light emitting layer contains at least one host material and at least one luminescent material, and the host material is a compound represented by the formula (I) as defined herein.

Abstract: An organic electroluminescent device comprising a pair of electrodes and at least one organic layer between the pair of electrodes, wherein the organic layer contains at least one compound represented by the formula (I), preferably by the formula (II) and more preferably by the formula (III) as defined herein.

Abstract: This present invention provides a light emitting element comprising at least one organic layer containing a light emitting layer provided between a pair of electrodes, and in this structure, at least one layer of the at least one organic layer contains at least one compound consisting essentially of carbon, fluorine and nitrogen.

Abstract: An organic electroluminescent element comprising: a pair of electrodes; and an organic layer provided between the pair of electrodes, the organic layer comprising a light-emitting layer and an electron transporting layer, wherein the light-emitting layer contains at least one phosphorescence-emitting material and at least one metal complex functioning as a host material, and the electron transporting layer contains a compound represented by the formula (E-I): LA)m??(E-I) wherein A represents a monovalent heterocyclic group wherein two or more aromatic hetero rings are condensed, the heterocyclic groups represented by A is the same or different from each other, m represents an integer of 2 or more, and L represents an m-valent linking group.

Abstract: An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer including a light emitting layer between the pair of electrodes, wherein the organic compound layer contains a metal complex that has a tridentate or more ligand and two or more metal ions.

Abstract: An organic electroluminescent device having a pair of electrodes and at least one organic layer interposed between the pair of electrodes, in which the at least one organic layer contains at least one compound represented by formula (I): wherein, Z1 and Z2 each independently represent a nitrogen-containing aromatic six-membered ring coordinated to the platinum through a nitrogen atom; Q1 represents a group of atoms necessary for forming, together with the —C—C—, a nitrogen-containing aromatic five-membered ring; L1 represents a single bond or a divalent linking group; and n is 0 or 1.

Abstract: A compound represented by formula (IA) or (IIA): wherein R11, R12 and R13 each represents a hydrogen atom, an aliphatic hydrocarbon group, an aryl group or a heterocyclic group; L1 represents a connecting group; R11 and R12, R11 and L1 and R12 and L1 may each combine with each other to form a ring when possible; R14, R15, R16 and R17 each represents a hydrogen atom or a substituent; and R13 to R17 may each combine with each of R11 to R17 or L1 to form a ring when possible; wherein R13 to R17 and L1 have the same meaning as in formula (IA); Q represents an atomic group necessary for forming a 5-, 6- or 7-membered ring with N; and R13, R14, R15, R16 and R17 may each combine with each of R13 to R17, the connecting group L1 or the atomic group Q to form a ring.

Abstract: This present invention provides a light emitting element comprising at least one organic layer containing a light emitting layer provided between a pair of electrodes, and in this structure, at least one layer of the at least one organic layer contains at least one compound consisting essentially of carbon, fluorine and nitrogen.

Abstract: An organic electroluminescent device contains: a pair of electrodes; and an organic compound layer containing a light-emitting layer, the organic compound layer being between the electrodes, wherein the organic compound layer contains a platinum complex including specific structure.

Abstract: An organic electroluminescent device, which has a pair of electrodes and at least one organic layer including a luminescent layer between the pair of electrodes, wherein at least one layer between the pair of electrodes comprises at least one metal complex having a tridentate- or higher polydentate-chain structure ligand.