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Issue 24, 2019
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Synthesis of delayed-emissive poly(2,7-carbazole)s having an anchored triazine pendant at the N-position†

Fumihiro Aso, ORCID logo a   Hidehisa Kawashima, ORCID logo b   Michiya Fujiki ORCID logo c  and  Masashi Kijima ORCID logo *b  
Author affiliations

* Corresponding authors

a Institute of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan

b Department of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
E-mail: kijima@ims.tsukuba.ac.jp

c Graduate School of Materials Science, Nara Institute of Science and Technology, Takayama, Ikoma, Nara 630-0192, Japan

Abstract

Several poly(2,7-carbazole)s having a planar triazine at the carbazole N-position were synthesized. Their torsion angles between the carbazole donor and the triazine acceptor units were controlled by phenylene connectors to separate their electronic functions. The polymers showed delayed fluorescence characteristics at room temperature besides phosphorescence with two different triplet energies at a liquid N2 temperature. The effect of π-conjugation along the polycarbazole main chain on the luminescence behavior was investigated by controlling the torsion angle between the carbazole units using substituents at 3,6-positions. The limitation of π-conjugation caused the overlapping of a phosphorescence spectrum with the fluorescence. They also showed solvent-dependent orientation properties like lyotropic liquid crystals. These new functions could be derived from the anchored acceptor unit in the polycarbazole.

Graphical abstract: Synthesis of delayed-emissive poly(2,7-carbazole)s having an anchored triazine pendant at the N-position

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Article information

https://doi.org/10.1039/C9PY00152B
Submitted
30 Jan 2019
Accepted
07 May 2019
First published
08 May 2019
Polym. Chem., 2019,10, 3318-3324
Article type
Paper
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Synthesis of delayed-emissive poly(2,7-carbazole)s having an anchored triazine pendant at the N-position

F. Aso, H. Kawashima, M. Fujiki and M. Kijima, Polym. Chem., 2019, 10, 3318
DOI: 10.1039/C9PY00152B

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