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

Fumihiro Aso; Hidehisa Kawashima; Michiya Fujiki; Masashi Kijima

doi:10.1039/C9PY00152B

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

Fumihiro Aso,

^a Hidehisa Kawashima,

^b Michiya Fujiki

^c and Masashi Kijima

*^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.

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DOI: https://doi.org/10.1039/C9PY00152B
Article type: Paper
Submitted: 30 Jan 2019
Accepted: 07 May 2019
First published: 08 May 2019

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Polym. Chem., 2019,10, 3318-3324

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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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Polymer Chemistry

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

Abstract

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

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