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Ruthenium(II) Polyimine Complexes with a Long-Lived 3IL Excited State or a 3MLCT/3IL Equilibrium: Efficient Triplet Sensitizers for Low-Power Upconversion

Authors

  • Shaomin Ji,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024 (China), Fax: (+86) 411-8498-6236
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  • Wanhua Wu,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024 (China), Fax: (+86) 411-8498-6236
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  • Wenting Wu,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024 (China), Fax: (+86) 411-8498-6236
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  • Dr. Huimin Guo,

    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024 (China), Fax: (+86) 411-8498-6236
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  • Prof. Jianzhang Zhao

    Corresponding author
    1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024 (China), Fax: (+86) 411-8498-6236
    • State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024 (China), Fax: (+86) 411-8498-6236
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  • We thank the NSFC (20972024 and 21073028), the Fundamental Research Funds for the Central Universities (DUT10ZD212), The Royal Society (UK) and the NSFC (China–UK Cost-Share program), the State Key Laboratory of Fine Chemicals (KF0802), the Education Department of Liaoning Province (2009T015), and DUT for financial support. MLCT=metal-to-ligand charge transfer; IL=intraligand.

Abstract

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Up, up, and away! The long-lived 3IL excited states of RuII polyimine complexes were found to be more efficient in sensitizing upconversion based on triplet–triplet annihilation (TTA) and energy transfer (TTET) than the shorter-lived 3MLCT excited states (see picture). Upconversion occurs with an anti-Stokes shift of up to 0.77 eV.

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