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A hole-transporting material,N1,N1,N3,N3-tetra([1,1-biphenyl]-4-yl)-N5,N5-diphenylbenzene-1,3,5-triamine(TDAB-BP),was synthesized by di([1,1-biphenyl]-4-yl)amine and 3,5-dichloro-N,N-diphenylaniline via Buchwald–Hartwig coupling reaction.