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Three novel D-A-Ar-type small molecules of TPA-DPP-P,TPA(DPP-P)2 and TPA(DPP-P)3 were synthesizedand characterized,in which triphenylamine(TPA),diketopyrrolopyrrole(DPP)and phenanthrene(P)were used as the donor(D)core,acceptor(A)arm,and enlarged π-system of polycyclic arene(Ar)terminal.