Patent ID: 8481174

Claim:
An organic electroluminescent (EL) device comprising: a first electrode; a second electrode; and an organic layer comprising an emissive layer between the first electrode and the second electrode, the emissive layer comprising an organic light-emitting compound of a cis-diarylethene derivative represented by Formula 1: where R 1 is a substituted or unsubstituted C 1 -C 30 alkylene group, an alkenylene group, or an alkynylene group; Ar 1 and Ar 2 are each independently a substituted or unsubstituted C 6 -C 30 arylene group, or a substituted or unsubstituted C 2 -C 30 heteroarylene group; Ar 3 , Ar 4 , Ar 5 and Ar 6 are each independently a substituted or unsubstituted C 6 -C 30 aryl group, or a substituted or unsubstituted C 2 -C 30 heteroaryl group; Ar 3 and Ar 4 can be linked to form a ring, and Ar 5 and Ar 6 can be linked to form a ring; l and m are each independently integers form 1 to 6; and k and n are each independently integers from 0 to 6, wherein at least one of k and n is larger than or equal to 1.