Light emitting device

A light emitting device having an anode, a cathode, and, a first organic layer and a second organic layer disposed between said anode and said cathode, wherein

• said first organic layer is a layer containing a metal complex represented by the formula (1), and
• said second organic layer is a layer containing at least one selected from the group consisting of a metal complex represented by the formula (2) and a polymer compound containing a constitutional unit having a group obtained by removing from the metal complex represented by the formula (2) one or more hydrogen atoms:
• wherein,
• M1 represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom,
• n1 represents an integer of 1 or more and n2 represents an integer of 0 or more, provided that n1+n2 is 3 when M1 is a rhodium atom or an iridium atom, while n1+n2=2 when M1 is a palladium atom or a platinum atom,
• Ring R1A represents a diazole ring, a triazole ring or a tetrazole ring,
• Ring R2 represents an aromatic hydrocarbon ring or an aromatic hetero ring, and the foregoing rings optionally have a substituent, and when a plurality of said substituents are present, they may be combined together to form a ring together with atoms to which they are attached, and when a plurality of Ring R2 are present, they may be the same or different,
• E1, E2, E11A, E12A and E13A each independently represent a nitrogen atom or a carbon atom, and when a plurality of E1, E2, E11A, E12A and E13A are present, they may be the same or different at each occurrence, and at least one of E1 and E2 is a carbon atom,
• R11A, R12A and R13A each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent hetero ring group, a substituted amino group or a halogen atom, and the foregoing groups optionally have a substituent, and when a plurality of R11A, R12A and R13A are present, they may be the same or different at each occurrence,
• at least one of E11A, E12A and E13A is a nitrogen atom, and at least one of R11A, R12A and R13A bonding to the nitrogen atom is a group represented by the formula (Ar-1A),
• R11A and R12A may be combined together to form a ring together with atoms to which they are attached, R12A and R13A may be combined together to form a ring together with atoms to which they are attached, and the substituent which Ring R2 optionally has and R11A may be combined together to form a ring together with atoms to which they are attached,
• when E11A is a nitrogen atom, R11A may be present or absent, when E12A is a nitrogen atom, R12A may be present or absent, and when E13A is a nitrogen atom, R13A may be present or absent,
• A1-G1-A2 represents an anionic bidentate ligand, A1 and A2 each independently represent a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be ring-constituent atoms, G1 represents a single bond or an atomic group constituting a bidentate ligand together with A1 and A2, and when a plurality of A1-G1-A2 are present, they may be the same or different,
• wherein,
• Ring A represents an aromatic hydrocarbon ring or an aromatic hetero ring, and the foregoing rings optionally have a substituent, and when a plurality of said substituents are present, they may be combined together to form a ring together with atoms to which they are attached,
• R2 represents an alkyl group, a cycloalkyl group, an alkoxy group, a cycloalkoxy group, an aryl group, an aryloxy group, a monovalent hetero ring group, a substituted amino group or a halogen atom, and the foregoing groups optionally have a substituent,
• wherein,
• M2 represents a rhodium atom, a palladium atom, an iridium atom or a platinum atom,
• n3 represents an integer of 1 or more and n4 represents an integer of 0 or more, provided that n3+n4=3 when M2 is a rhodium atom or an iridium atom, while n3+n4 is 2 when M2 is a palladium atom or a platinum atom,
• EL represents a carbon atom or a nitrogen atom, and when a plurality of EL are present, they may be the same or different at each occurrence,
• Ring L1 represents a 6-membered aromatic hetero ring, and this ring optionally has a substituent, and when a plurality of said substituents are present, they may be combined together to form a ring together with atoms to which they are attached, and when a plurality of Ring L are present, they may be the same or different,
• Ring L2 represents an aromatic hydrocarbon ring or an aromatic hetero ring, and the foregoing rings optionally have a substituent, and when a plurality of said substituents are present, they may be combined together to form a ring together with atoms to which they are attached, and when a plurality of Ring L2 are present, they may be the same or different,
• the substituent which Ring L1 optionally has and the substituent which Ring L2 optionally has may be combined together to form a ring together with atoms to which they are attached,
• A3-G2-A4 represents an anionic bidentate ligand, A3 and A4 each independently represent a carbon atom, an oxygen atom or a nitrogen atom, and these atoms may be ring-constituent atoms, G2 represents a single bond or an atomic group constituting a bidentate ligand together with A3 and A4, and when a plurality of A3-G2-A4 are present, they may be the same or different.