Dimeric phenanthroimidazole for blue electroluminescent materials: the effect of substituted position attached to biphenyl center

Literature Information

Publication Date 2014-03-07
DOI 10.1039/C4CP00209A
Impact Factor 3.676
Authors

Zhiming Wang, Ying Feng, Hui Li, Zhao Gao, Xiaojuan Zhang, Ping Lu, Ping Chen, Yuguang Ma, Shiyong Liu


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Abstract

Two isomers of 4,4′-bis(1-phenyl-phenanthro[9,10-d]-imidazol-2-yl)biphenyl (BPPI), L-BPPI and Z-BPPI were prepared by tuning the substituted position on the biphenyl from para- to meta-coupling. Because of the conjugated degree change at the C2-position in the phenanthroimidazole block, the fluorescent color of L-BPPI (433 nm) and Z-BPPI (402 nm) showed an obvious blue-shift compared with that of BPPI (468 nm) in the films. Meanwhile, their non-doped devices exhibited more valuable and stable deep-blue emissions with a CIE coordinate of (0.16, 0.10) and (0.16, 0.11), respectively. Furthermore, some valuable information on structure–properties was obtained by density functional theory calculations, and photophysical and electrochemical characterization.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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