Patent ID: 7871713

Claim:
An electroluminescent material represented by the following Formula C1: wherein Ar 51 is an aryl group or an aromatic heterocyclic group; n is an integer of from 0 to 6; L 21 , L 22 , L 23 , L 24 , L 25 and L 26 are an atom or a group of atoms necessary to form a 6-membered nitrogen-containing aromatic heterocyclic group, provided that at least one of L 21 , L 22 , L 23 , L 24 , L 25 and L 26 is ═N— or —N(R 51 )—; R 51 is a hydrogen atom or a substituent, provided that adjacent substituent groups existing in the molecule represented by formula C1 may be condensed with each other to form a ring and Ar 51 may be attached directly to the 6-membered nitrogen-containing ring or may be indirectly attached via one or more substituents on the 6-membered ring; wherein the electroluminescence material is a mixture comprising at least two diastereomers represented by Formula C1, provided that in Formula C1, at least two of Ar 51 and R 51 are a biaryl group having a bond capable of giving an internal rotational isomerism or a group comprising the biaryl group.