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Alkylated Indolo[3,2,1-Jk]carbazoles as New Building Blocks for Solution Processable Organic Electronics

preprint
submitted on 17.08.2020 and posted on 18.08.2020 by Thomas Kader, Guangrong Jin, Matthias Pletzer, Dongge Ma, Johannes Fröhlich, Jiangshan Chen, Paul Kautny

A facile strategy for the introduction of tert-butyl and hexyl chains to the indolo[3,2,1-jk]carbazole scaffold is presented. With these building blocks six materials based on three different 4,4ʹ-bis(N- carbazolyl)-1,1ʹ-biphenyl derivatives with varying degree of planarization were prepared. Characterization of the materials showed that the alkyl chains have only minor effects on the photophysical properties of the compounds. In contrast, thermal robustness towards decomposition and electrochemical stability are increased by the introduced alkyl chains. Detailed investigation of the solubility in five different solvents revealed that the incorporation of the alkyl chains increases the solubility significantly. The increased solubility of the materials allowed the application as host materials in red, green and blue solution processed PhOLEDs. Hence, this work presents the first solution processed OLED devices based on the indolo[3,2,1-jk]carbazole scaffold.

Funding

Austrian Science Fund (FWF) grant No. I 2589-N34

History

Email Address of Submitting Author

thomas.kader@tuwien.ac.at

Institution

TU Wien

Country

Austria

ORCID For Submitting Author

0000-0002-0229-4693

Declaration of Conflict of Interest

No conflict of interest

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