Patent ID: 7976959

Claim:
An organic electroluminescent element comprising a pair of electrodes and an organic compound layer sandwiched between the pair of electrodes, at least one of the electrodes being transparent, the organic compound layer comprising one or more layers, and at least one of the one or more layers containing at least one charge-transporting polyester represented by the following Formula (I-1) or (I-2): wherein, in Formulae (I-1) and (I-2), A 1 represents at least one structure selected from the structures represented by the following Formulae (II-1) and (II-2), Y 1 represents a divalent alcohol residue, Z 1 represents a divalent carboxylic acid residue, terminal groups B each independently represent hydrogen or a group represented by —O—(Y 1 —O) m —H or —O—(Y 1 —O) m —CO—Z 1 —CO—OR′ (wherein R′ represents a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group), m represents an integer of 1 to 5, and p represents an integer of 5 to 5000: wherein, in Formulae (II-1) and (II-2), Ar represents a substituted or unsubstituted phenyl group, a substituted or unsubstituted monovalent polynuclear aromatic hydrocarbon group having 2 to 10 aromatic rings, a substituted or unsubstituted monovalent condensed aromatic hydrocarbon group having 2 to 10 aromatic rings, or a substituted or unsubstituted monovalent aromatic heterocyclic group, i and j each represent 0 or 1, T represents a divalent straight-chain hydrocarbon group having 1 to 6 carbon atoms or a divalent branched hydrocarbon group having 2 to 10 carbon atoms, and X represents a divalent group represented by the following Formula (III): wherein, in Formula (III), R represents a hydrogen atom, a straight-chain hydrocarbon group having 1 to 6 carbon atoms, or a monovalent branched hydrocarbon group having 2 to 10 carbon atoms.