Patent ID: 8431248

Claim:
A lighting installation comprising a light emitting element, the light emitting element comprising; a layer interposed between an anode and a cathode, the layer comprising a carbazole derivative represented by a general formula (1), wherein R 1 is selected from hydrogen, an aryl group having 6 to 25 carbon atoms, a heteroaryl group having 5 to 9 carbon atoms, and an acyl group having 1 to 7 carbon atoms, wherein R 2 is a substituent represented by a general formula (2), wherein each of Ar 1 to Ar 6 is selected from an aryl group having 6 to 25 carbon atoms and a heteroaryl group having 5 to 9 carbon atoms, and wherein each of X and Y is selected from a bivalent aromatic hydrocarbon group having 6 to 25 carbon atoms and a bivalent heterocyclic group having 5 to 10 carbon atoms.