Deep Blue Fluorescent Host Materials Based on a Novel Spiro[benzo[c]fluorene-7,9'-fluorene] Core Structure with Side Aromatic Wings

Abstract

E-mail: msgong@dankook.ac.krReceived March 24, 2012, Accepted April 9, 2012Deep blue fluorescent host materials based on a novel spiro[benzo[ c]fluorene-7,9'-fluorene] core structure withside aromatic wings in the 5- and 9-positions, namely, 5,9-di(naphthalen-2-yl)spiro[benzo[c]fluorene-7,9'-fluorene] (DN-SBFF), 5,9-bis(4-t-butylphenyl)spiro[benzo[ c]fluorene-7,9'-fluorene] (BP-SBFF), and 5,9-bis(4-fluorophenyl)spiro[benzo[ c]fluorene-7,9'-fluorene] (FP-SBFF), were designed and successfully pre-pared using the Suzuki reaction. The physical properties of these materials and their EL characteristics as bluehost materials doped with N,N,N',N'-tetraphenylspiro[benzo[c]fluorene-7,9'-fluorene]-5,9-diamine ( TPA-SBFF)were investigated. The device used comprised ITO/ N,N'-diphenyl-N,N'-bis[4-(phenyl-m-tolyl-amino)phenyl]-biphenyl-4,4'-diamine (DNTPD)/N,N'-di(1-naphthyl)-N,N'-diphenylbenzidine (NPB)/(FP-SBFF):dopant x%/tris(8-hydroxyquinoline)aluminum (Alq