N-(2',7'-di-tert-butyl-9,9'-spirobi[fluoren]-2-yl)-N-(4'-(9,9-dimethylacridin-10(9H)-yl)-[1,1'-biphenyl]-4-yl)dibenzo[b,d]furan-4-amine

N,N-diphenyl-4'-(9'-phenyl-9H,9'H-[3,3'-bicarbazol]-9-yl)-[1,1'-biphenyl]-4-amine

N,N-diphenyl-4'-(12-(pyridin-2-yl)-1H-dibenzo[3,4:5,6]azuleno[1,8,7-hij]isoquinolin-1-yl)-[1,1'-biphenyl]-4-amine

N,N-diphenyl-4'-(13-phenylbenzo[kl]benzo[4,5]indolo[2,3-a]acridin-4(13H)-yl)-[1,1'-biphenyl]-4-amine

N,N-diphenyl-4'-(2-phenyl-1H-dibenzo[3,4:5,6]azuleno[1,8,7-hij]isoquinolin-1-yl)-[1,1'-biphenyl]-4-amine

N,N-diphenyl-4'-(13-phenylbenzo[a]indolo[3,2-i]carbazol-14(13H)-yl)-[1,1'-biphenyl]-4-amine

N,N-diphenyl-4'-(9'-phenyl-9H,9'H-[2,4'-bicarbazol]-9-yl)-[1,1'-biphenyl]-4-amine

N,N-diphenyl-4'-(5-phenylbenzo[h]indolo[3,2-a]carbazol-14(5H)-yl)-[1,1'-biphenyl]-4-amine

N,N-diphenyl-4'-(9,9,13c-trimethyl-9,13c-dihydro-5H-benzo[4,5]pentaleno[1,2,3-kl]acridin-5-yl)-[1,1'-biphenyl]-4-amine

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

N-(4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-N-(4-(triphenylsilyl)phenyl)naphthalen-1-amine

N,N-diphenyl-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-amine

N,N-diphenyl-4'-(11-(4-phenylquinazolin-2-yl)-5H-benzo[4,5]thieno[3,2-c]carbazol-5-yl)-[1,1'-biphenyl]-4-amine

N-(4'-(3,6-dichloro-9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-N-(9,9-dimethyl-9H-fluoren-2-yl)-9,9'-spirobi[fluoren]-2-amine

N-(4-(2-([1,1'-biphenyl]-3-yl)naphthalen-1-yl)phenyl)-N-([1,1'-biphenyl]-4-yl)-4'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-4-amine

N-(4'-(3,6-diphenyl-9H-carbazol-9-yl)-[1,1'-biphenyl]-4-yl)-9,9-dimethyl-10-(naphthalen-1-yl)-N-phenyl-9,10-dihydroacridin-2-amine

N-(4-(2-([1,1'-biphenyl]-3-yl)naphthalen-1-yl)phenyl)-4'-(9H-carbazol-9-yl)-N-(4-(phenanthren-9-yl)phenyl)-[1,1'-biphenyl]-4-amine

N-(4-(benzo[d]thiazol-2-yl)phenyl)-4'-(9H-carbazol-9-yl)-N-(4-(dibenzo[b,d]furan-4-yl)phenyl)-[1,1'-biphenyl]-4-amine

N-(4-(adamantan-1-yl)phenyl)-N-(4-(naphthalen-1-yl)phenyl)-4'-(10H-phenoxazin-10-yl)-[1,1'-biphenyl]-4-amine