Patent ID: 8227801

Claim:
A compound comprising a bicarbazole, wherein the compound has the formula: wherein R a , R b , R c , and R d may represent mono, di, tri, or tetra substitutions; wherein R a , R b , R c , R d , R 1 , and R 2 are independently selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, aryl and heteroaryl; wherein at least one of R 1 and R 2 has the formula: wherein A and B are independently 5 or 6 membered carbocyclic or heterocyclic rings; wherein R A and R B are independently selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, aryl and heteroaryl; and wherein X is S, O or Se.