N4-(9,9'-spirobi[fluoren]-7-yl)-N4,N4'-diphenyl-N4'-(2-(5-phenylthiophen-2-yl)phenyl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4-diphenyl-N4',N4'-bis(tribenzo[b,d,f]oxepin-2-yl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(9-phenyl-6-(pyridin-3-yl)-9H-carbazol-3-yl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(6-(4-(trimethylsilyl)phenyl)naphthalen-2-yl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(6-(pyridin-2-yl)naphthalen-2-yl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(4-(5-(pyridin-4-yl)-1,3,4-oxadiazol-2-yl)phenyl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(4-(3-(trimethylsilyl)phenyl)naphthalen-2-yl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(4-((1Z,3Z)-4-phenylbuta-1,3-dien-1-yl)phenyl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(4-(quinolin-8-yl)naphthalen-1-yl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(4-tritylphenyl)-[1,1'-biphenyl]-4,4'-diamine

N4-(3-(dibenzo[b,d]furan-3-yl)phenyl)-N4,N4'-diphenyl-N4'-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalen-2-yl)-[1,1'-biphenyl]-4,4'-diamine

N4-(4-(7bH-indeno[1,2,3-jk]fluoren-7b-yl)phenyl)-N4-(4-(tert-butyl)phenyl)-N4',N4'-diphenyl-[1,1'-biphenyl]-4,4'-diamine

N4-(3-(ethyl(3-methylbenzyl)amino)phenyl)-N4'-(pyren-1-yl)-N4,N4'-di-m-tolyl-[1,1'-biphenyl]-4,4'-diamine

N4,N4,N4'-tris(4-(adamantan-1-yl)phenyl)-N4'-(4-(tert-butyl)phenyl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4-diphenyl-N4',N4'-bis(4-(5-phenyloxazol-2-yl)phenyl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(4-(5-phenyl-5H-pyrido[3,2-b]indol-8-yl)phenyl)-[1,1'-biphenyl]-4,4'-diamine

N4-(3-(dibenzo[b,d]furan-4-yl)phenyl)-N4'-(dibenzo[b,d]thiophen-4-yl)-N4,N4'-diphenyl-[1,1'-biphenyl]-4,4'-diamine

N4-(4-(13-bromo-2,5,8,11-tetraoxatridecyl)phenyl)-N4,N4',N4'-triphenyl-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-diphenyl-N4,N4'-bis(4-(6-phenylpyridin-2-yl)phenyl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4,N4'-triphenyl-N4'-(3-(((4-vinylbenzyl)oxy)methyl)phenyl)-[1,1'-biphenyl]-4,4'-diamine