N-(4'-(4H-naphtho[1',8':5,6,7][1,4]diazepino[3,2,1-jk]carbazol-7-yl)-[1,1'-biphenyl]-4-yl)-9,9-dimethyl-N-phenyl-9H-fluoren-4-amine

4,4'-bis(5-methyl-2-(o-tolyl)-9H-carbazol-9-yl)-1,1'-biphenyl

N-(4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-9,9-dibutyl-N-phenyl-9H-fluoren-2-amine

9,9-dimethyl-N-phenyl-N-(4'-(11-phenyl-11,16-diazadibenzo[g,ij]indeno[1',2':3,4]naphtho[2,1,8-cde]azulen-16(11H)-yl)-[1,1'-biphenyl]-4-yl)-9H-fluoren-2-amine

4,4'-bis(3-phenyl-9H-carbazol-9-yl)-1,1'-biphenyl

9,9-dimethyl-N-phenyl-N-(4'-(2-phenyl-10H-1,2a,10-triazabenzo[4,5]azuleno[1,8,7,6-cdef]fluoren-10-yl)-[1,1'-biphenyl]-4-yl)-9H-fluoren-2-amine

N-(4'-(10H-phenothiazin-10-yl)-[1,1'-biphenyl]-4-yl)-N-(4-(adamantan-1-yl)phenyl)-9,9-dimethyl-9H-fluoren-4-amine

N-(4'-(10H-phenoxazin-10-yl)-[1,1'-biphenyl]-4-yl)-N-(4-(10H-phenoxazin-10-yl)phenyl)-9,9-diethyl-9H-fluoren-2-amine

4,4'-bis(3-bromo-6-octyl-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-allyl-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(benzo[d]oxazol-2-yl)-6-phenyl-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(12-(naphthalen-1-yl)-9H-dibenzo[a,c]carbazol-9-yl)-1,1'-biphenyl

4,4'-di(9H-[1,9'-bicarbazol]-9-yl)-1,1'-biphenyl

4,4'-bis(3,6-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazol-9-yl)-1,1'-biphenyl

N-(4'-(4H-4,8b-diazaindeno[1,2,3-gh]pleiaden-4-yl)-[1,1'-biphenyl]-4-yl)-N-([1,1'-biphenyl]-2-yl)-9-(naphthalen-1-yl)-9H-carbazol-1-amine

9-(dibenzo[b,d]furan-4-yl)-N-phenyl-N-(4'-(12-phenylbenzo[b]naphtho[1,8-ef][1,4]diazepin-7(12H)-yl)-[1,1'-biphenyl]-4-yl)-9H-carbazol-3-amine