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Tetradentate Pt(II) Complexes with Peripheral Hindrances for Highly Efficient Solution-Processed Blue Phosphorescent OLEDs

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    Tetradentate Pt(II) Complexes with Peripheral Hindrances for Highly Efficient Solution-Processed Blue Phosphorescent OLEDs
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    • Lu Zhu
      Lu Zhu
      Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
      More by Lu Zhu
    • Chenwei Sha
      Chenwei Sha
      Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
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    • Anqi Lv
      Anqi Lv
      Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
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    • Wang Xie
      Wang Xie
      Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
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    • Kang Shen
      Kang Shen
      Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
      More by Kang Shen
    • Yumeng Chen
      Yumeng Chen
      Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
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    • Guohua Xie*
      Guohua Xie
      Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan 430072, China
      Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
      *Email: [email protected]
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      Orcidhttps://orcid.org/0000-0003-0764-7889
    • Huili Ma
      Huili Ma
      Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
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      Orcidhttps://orcid.org/0000-0003-0332-2999
    • Hongbo Li
      Hongbo Li
      Yanshan Branch of Beijing Research Institute of Chemical Industry, Sinopec, Beijing 102500, China
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    • Xiao-Chun Hang*
      Xiao-Chun Hang
      Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China
      *Email: [email protected]
      More by Xiao-Chun Hang
      Orcidhttps://orcid.org/0000-0002-3097-1268
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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2022, 61, 27, 10402–10409
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    https://doi.org/10.1021/acs.inorgchem.2c01063
    Published June 27, 2022
    Copyright © 2022 American Chemical Society
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    Abstract

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    Two tetradentate Pt(II) complexes with peripheral bulky-group hindrances [Pt(pzpyOczpy-B1) and Pt(pzpyOczpy-B2)] were synthesized and fully investigated for their structural and blue phosphorescent properties. Both X-ray crystallography and computational simulation revealed that bulky substituents incorporated into the C-pyrazolyl and C-pyridinyl positions lie out of the cyclometallated plane, thus alleviating the intramolecular distortions as well as reducing the intermolecular interaction in the solid state. In dichloromethane, their emission peaks at 460 nm with a narrow full width at half-maximum (FWHM) of less than 50 nm, and the photoluminescent quantum yields are over 95% with short decay lifetimes (<5 μs). Solution-processed blue devices are fabricated based on the two complexes. Device A based on Pt(pzpyOczpy-B1) shows excellent electroluminescent performances with the maximum current efficiency, power efficiency, and external quantum efficiency of 47.0 cd/A, 24.6 lm/W, and 22.9%, respectively. The understanding on inert peripheral hindrances provides an effective approach to designing Pt(II) complexes for high-quality blue phosphorescent emitters.

    Copyright © 2022 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.inorgchem.2c01063.

    • General procedures, structural information (Figure S1 and Tables S1), photophysical properties (Figures S2, S3, and Tables S2–S4), electrochemical characterization (Figures S4), computational simulations of molecular orbitals (Figure S5 and Tables S5), electroluminescent properties of the devices (Figures S6–S9), HRMS spectra (Figures S10 and S11), and 1H and 13C NMR spectra (Figures S12–S15) (PDF)

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    CCDC 2161428 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/data_request/cif, or by emailing [email protected], or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033.

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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2022, 61, 27, 10402–10409
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.inorgchem.2c01063
    Published June 27, 2022
    Copyright © 2022 American Chemical Society
    Request reuse permissions

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