Patent ID: 8318995

Claim:
An asymmetric pyrene derivative represented by formula (2): wherein, Ar and Ar′ each represents a substituted or unsubstituted aromatic group exclusive of a pyrenyl group, and each of Ar and Ar′ is an aromatic group selected from the group consisting of phenyl group, 1-naphthyl group, 2-naphthyl group, 1-anthryl group, 2-anthryl group, 9-anthryl group, 9-(10-phenyl)anthryl group, 9-(10-naphthyl-1-yl)anthryl group, 9-(10-naphthyl-2-yl)anthryl group, 1-phenanthryl group, 2-phenanthryl group, 3-phenanthryl group, 4-phenanthryl group, 9-phenanthryl group, 1-naphthacenyl group, 2-naphthacenyl group, 9-naphthacenyl group, 2-biphenylyl group, 3-biphenylyl group, 4-biphenylyl group, p-terphenyl-4-yl group, p-terphenyl-3-yl group, p-terphenyl-2-yl group, m-terphenyl-4-yl group, m-terphenyl-3-yl group, m-terphenyl-2-yl group, o-tolyl group, m-tolyl group, p-tolyl group, p-t-butylphenyl group, 3-methyl-2-naphthyl group, 4-methyl-1-naphthyl group, 4-methyl-1-anthryl group, L and L′ each represents a substituted or unsubstituted phenylene group, a substituted or unsubstituted naphthalenylene group, a substituted or unsubstituted fluorenylene group, or a substituted or unsubstituted dibenzosilolylene group; m represents an integer of 0 to 2; s represents an integer of 0 to 2; and L′ or Ar′ bonds to any one of 2 to 10 positions of pyrene; (3′) Ar=Ar′, L=L′, m=s, t=1, and both L and L′ or pyrene each bonds respectively to different positions of Ar and Ar′, or (4′) Ar=Ar′, L=L′, m=s, t=1, and both L and L′ or pyrene each bonds to the same positions of Ar and Ar′, excluding a case where L′ or Ar′ bonds to 6 position of pyrene, provided that symmetric pyrene derivatives are excluded.