4P-NPB N,N'-di-(1-naphthalenyl)-N,N'-diphenyl-[1,1':4',1'':4'',1'''-quaterphenyl]-4,4'''-diamine CAS: 948552-24-7 4P-NPBN,N'-di-(1-naphthalenyl)-N,N'-diphenyl-[1,1':4',1'':4'',1'''-quaterphenyl]-4,4'''-diamineCAS: 948552-24-7Formula: C56H40N2M.W.: 740.93Abs: 351nm(CHCl3)PL: 422nm(CHCl3) Hole Transport Materials: NPB, TPD, TAPC, Spiro-TAD;Hole Injection Materials: F4TCNQ, TCNQ, PPDN, CuPC, TiOPC; ...