TY - JOUR
T1 - Photon-Upconverting Ionic Liquids
T2 - Effective Triplet Energy Migration in Contiguous Ionic Chromophore Arrays
AU - Hisamitsu, Shota
AU - Yanai, Nobuhiro
AU - Kimizuka, Nobuo
N1 - Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - 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.
AB - 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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U2 - 10.1002/anie.201505168
DO - 10.1002/anie.201505168
M3 - Article
AN - SCOPUS:84943457704
SN - 1433-7851
VL - 54
SP - 11550
EP - 11554
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 39
ER -