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Issue 24, 2018
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Amplified spontaneous emission in insulated polythiophenes

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Insulated polythiophenes bearing conjugated backbones, which are fully (IPT) or half (½IPT) encapsulated by cyclic side chains (IPTs), are introduced and comprehensively investigated to determine the relationship between their structure, photophysics and light-amplifying properties in the solid state. Upon full polythiophene encapsulation, we observe enhanced planarization of the conjugated backbone, which is demonstrated by the highly vibronic and mirror-image absorption and photoluminescence spectra in solution and solid state. In sharp contrast with poly(3-hexylthiophene) (P3HT), ½IPT and IPT exhibit a progressive reduction in torsional relaxation in solution together with significantly larger photoluminescence quantum efficiencies. The transient absorption (TA) spectra of ½IPT and IPT in the solid state depict clear stimulated emission (SE) bands free of spectral overlap with photoinduced absorption (PA) from inter-chain charge pairs. Furthermore, effective solid state backbone encapsulation is reflected in high SE cross-sections and efficient amplified spontaneous emission in 1/2IPT and IPT. Our results show that backbone self-sheathing enables the exploitation of single chain properties in the solid state, which is of particular relevance for lighting applications.

Graphical abstract: Amplified spontaneous emission in insulated polythiophenes

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Article information

12 Mar 2018
29 May 2018
First published
30 May 2018

J. Mater. Chem. C, 2018,6, 6591-6596
Article type

Amplified spontaneous emission in insulated polythiophenes

C. Sun, M. M. Mróz, J. R. Castro Smirnov, L. Lüer, D. Hermida-Merino, C. Zhao, M. Takeuchi, K. Sugiyasu and J. Cabanillas-González, J. Mater. Chem. C, 2018, 6, 6591
DOI: 10.1039/C8TC01204K

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