Polycyclic ring assembly compound and organic electroluminescent device employing the same

An organic electroluminescence device, comprising one or more organic thin film layers including at least one light emitting layer interposed between a cathode and an anode, wherein at least one of the organic thin film layers comprises a polycyclic ring assembly compound represented by formula (1) as a light emitting material:

• wherein
• Ar1 represents a hydrogen atom, a substituted or unsubstituted aromatic ring group having 6 to 50 ring carbon atoms, or a substituted or unsubstituted aromatic heterocyclic ring group having 5 to 50 ring atoms;
• wherein the substituent of the aromatic ring group and the aromatic heterocyclic ring group is selected from the group consisting of an alkyl group having 1 to 8 carbon atoms, a silyl group having 3 to 24 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a fluorine atom, a diphenylamino group, a dibenzofuranyl group, and a dibenzothiophenyl group;
• X represents a substituted or unsubstituted 9,10-anthracenediyl group;
• and
• —Ar2—Ar3—Ar4 is represented by one of formulae (4) to (6):
• wherein
• Ar2 represents a phenylene group;
• Ar4 represents a methyl group, a phenyl group, a 1-naphthyl group, a 2-naphthyl group, a 2-biphenylyl group, a 3-biphenylyl group, or a 4-biphenylyl group;
• and
• R′1 and R′3 to R′8 each independently represents a hydrogen atom or a phenyl group.