Photon-Upconverting Ionic Liquids

Effective Triplet Energy Migration in Contiguous Ionic Chromophore Arrays

Shota Hisamitsu, Nobuhiro Yanai, Nobuo Kimizuka

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Inspired by the bicontinuous ionic-network structure of ionic liquids (ILs), we developed a new family of photofunctional ILs which show efficient triplet energy migration among contiguously arrayed ionic chromophores. A novel fluorescent IL, comprising an aromatic 9,10-diphenylanthracene 2-sulfonate anion and an alkylated phosphonium cation, showed pronounced interactions between chromophores, as revealed by its spectral properties. Upon dissolving a triplet sensitizer, the IL demonstrated photon upconversion based on triplet-triplet annihilation (TTA-UC). Interestingly, the TTA-UC process in the chromophoric IL was optimized at a much lower excitation intensity compared to the previous nonionic liquid TTA-UC system. The superior TTA-UC in this IL system is characterized by a relatively high triplet diffusion constant (1.63×10-6 cm2 s-1) which is ascribed to the presence of ionic chromophore networks in the IL.

Original languageEnglish
Pages (from-to)11550-11554
Number of pages5
JournalAngewandte Chemie - International Edition
Volume54
Issue number39
DOIs
Publication statusPublished - Sep 1 2015

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Ionic Liquids
Chromophores
Ionic liquids
Photons
Anions
Cations
Negative ions
Positive ions
Liquids

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

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abstract = "Inspired by the bicontinuous ionic-network structure of ionic liquids (ILs), we developed a new family of photofunctional ILs which show efficient triplet energy migration among contiguously arrayed ionic chromophores. A novel fluorescent IL, comprising an aromatic 9,10-diphenylanthracene 2-sulfonate anion and an alkylated phosphonium cation, showed pronounced interactions between chromophores, as revealed by its spectral properties. Upon dissolving a triplet sensitizer, the IL demonstrated photon upconversion based on triplet-triplet annihilation (TTA-UC). Interestingly, the TTA-UC process in the chromophoric IL was optimized at a much lower excitation intensity compared to the previous nonionic liquid TTA-UC system. The superior TTA-UC in this IL system is characterized by a relatively high triplet diffusion constant (1.63×10-6 cm2 s-1) which is ascribed to the presence of ionic chromophore networks in the IL.",
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