Amplified spontaneous emission in insulated polythiophenes

Chen Sun, Marta Magdalena Mróz, José Raúl Castro Smirnov, Larry Lüer, Daniel Hermida-Merino, Chunhui Zhao, Masayuki Takeuchi, Kazunori Sugiyasu, Juan Cabanillas-González

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Insulated polythiophenes bearing conjugated backbones, which are fully (IPT) or half (IPT) 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), IPT and IPT exhibit a progressive reduction in torsional relaxation in solution together with significantly larger photoluminescence quantum efficiencies. The transient absorption (TA) spectra of IPT 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.

Original languageEnglish
Pages (from-to)6591-6596
Number of pages6
JournalJournal of Materials Chemistry C
Volume6
Issue number24
DOIs
Publication statusPublished - 2018
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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