Patent ID: 8084935

Claim:
An organic electroluminescent element comprising: a pair of opposed electrodes, a cathode and an anode; and an organic compound layer having a single-layer or multi-layer structure held between said pair of opposed electrodes, at least one layer constituting said organic compound layer being a layer containing at least one copolymer comprising at least one monomer unit represented by formula (I) and at least one other monomer: wherein Ar represents an unsubstituted or substituted arylene group having 6 to 60 carbon atoms involved in conjugation or an unsubstituted or substituted heterocyclic compound group having 4 to 60 carbon atoms involved in conjugation; L represents a divalent hydrocarbon or hetero-atom-containing hydrocarbon group, which may be branched or contain a cyclic structure, having one or more carbon atoms; R 1 to R 5 each independently represent a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 60 carbon atoms, an aryloxy group having 6 to 60 carbon atoms, an arylalkyl group having 7 to 60 carbon atoms, an arylalkoxy group having 7 to 60 carbon atoms, a heterocyclic compound group having 4 to 60 carbon atoms, a cyano group, a nitro group, and a halogen atom, and the at least one other monomer is selected from the group consisting of styrene, a monomer having a triphenylamine structure represented by formula (III) and a monomer having an Iridium-containing metal complex structure represented by formula (IV):