Deep blue fluorescent host materials based on spirobenzofluorene-fluorene dimers and their properties

作者：Lee Chil Won; Jang Ji Geun; Gong Myoung Seon^*

来源：Dyes and Pigments, 2013, 98(3): 471-478.

DOI：10.1016/j.dyepig.2013.03.027

• Blue OLED
• Blue host
• Spiro[benzo[c]fluorene-7,9 %26apos
• -fluorene] dimer
• Color purity
• Spirodimer
• Blue dopant

Deep blue fluorescent host materials based on the novel spiro[benzo[c]fluorene-7,9%26apos;-fluorene] dimers, 5-[spiro[benzo[c]fluorene-7,9%26apos;-fluoren]-5-yl] spiro[benzo[c]fluorene-7,9%26apos;-fluorene], 9-[spiro[benzo[c]fluorene-7,9%26apos;-fluoren]-2%26apos;-yl] spiro[benzo[c]fluorene-7,9%26apos;-fluorene], and 1,4-bis(spiro[benzo[c]fluorene-7,9%26apos;fluorene]-5-yl)benzene were designed and successfully prepared using the Suzuki coupling reaction. The physical properties of the sprodimers and their electroluminescent characteristics as blue host materials doped with N,N,N%26apos;,N%26apos;-tetraphenylspiro[benzo[c]fluorene-7,9%26apos;-fluorene]-5,9-diamine were investigated. The device configuration used was ITO/N,N%26apos;-diphenyl-N,N%26apos;-bis[4-(phenyl-m-tolyl-amino)phenyl] biphenyl-4,4%26apos;-diamine/N,N%26apos;-di(1-naphthyl)-N,N%26apos;-diphenylbenzidine/host:5% dopant/tris(8-hydroxyquino line)aluminum)/LiF. The device obtained from 1,4-bis(spiro[benzo[c]fluorene-7,9%26apos;-fluorene]-5-yl)benzene doped with N,N,N%26apos;,N%26apos;-tetraphenylspiro[benzo[c]fluorene-7,9%26apos;-fluorene]-5,9-diamine showed a high color purity of (0.146 and 0.148), efficiency of 7.44 cd A(-1) and an external quantum efficiency of 5.60% at 7 V.

• 出版日期2013-9