Novel nematic and glassy liquid crystalline oligomers as electroluminescent organic semiconductors

ABSTRACT

Several oligomers (MWs > 1000 g mol⁻¹) with highly rigid and conjugated aromatic cores, incorporating 1,4-disubstituted phenylene, 2,7-disubstituted fluorene, 1,4-disubstituted thiophene and/or 2,7-disubstituted carbazole rings with lateral and terminal substituents were synthesised as novel organic semiconductors. These novel liquid crystalline oligomers exhibit glass transition temperatures above room temperature, high clearing points and a broad nematic temperature range as well as electroluminescent behaviour in solution-processed devices.

KEYWORDS:

• Nematic and glassy liquid crystalline
• oligomers
• electroluminescence
• organic semiconductors

Acknowledgments

Huaiyin Institute of Technology, the China Scholarship Council and the University of Hull are thanked for their support for Dr Guang Hu.

Disclosure statement

There are no conflicts of interest to declare.

Additional information

Funding

This work was supported by the China Scholarship Council; Huaiyin Institute of Technology; University of Hull.