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A New Type of Hybrid Copper Iodide as Nontoxic and Ultrastable LED Emissive Layer Material
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    A New Type of Hybrid Copper Iodide as Nontoxic and Ultrastable LED Emissive Layer Material
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    • Kun Zhu
      Kun Zhu
      Department of Chemistry and Chemical Biology, Rutgers University, 123 Bevier Road, Piscataway, New Jersey 08854, United States
      More by Kun Zhu
    • Zhongkai Cheng
      Zhongkai Cheng
      Department of Chemistry and Chemical Biology, Rutgers University, 123 Bevier Road, Piscataway, New Jersey 08854, United States
      Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey 08854, United States
    • Sylvie Rangan
      Sylvie Rangan
      Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway Township, New Jersey 08854, United States
    • Mircea Cotlet
      Mircea Cotlet
      Center for Functional Nanomaterials, Brookhaven National Laboratory, 98 Rochester Street, Upton, New York 11973, United States
    • Jingbo Du
      Jingbo Du
      Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, 20 Yizhi Road, Nankai District, Tianjin 300072, P.R. China
      More by Jingbo Du
    • Leila Kasaei
      Leila Kasaei
      Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway Township, New Jersey 08854, United States
      More by Leila Kasaei
    • Simon J. Teat
      Simon J. Teat
      Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
    • Wei Liu
      Wei Liu
      Department of Chemistry and Chemical Biology, Rutgers University, 123 Bevier Road, Piscataway, New Jersey 08854, United States
      More by Wei Liu
    • Yifei Chen
      Yifei Chen
      Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, 20 Yizhi Road, Nankai District, Tianjin 300072, P.R. China
      More by Yifei Chen
    • Leonard C. Feldman
      Leonard C. Feldman
      Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway Township, New Jersey 08854, United States
    • Deirdre M. O’Carroll
      Deirdre M. O’Carroll
      Department of Chemistry and Chemical Biology, Rutgers University, 123 Bevier Road, Piscataway, New Jersey 08854, United States
      Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey 08854, United States
    • Jing Li*
      Jing Li
      Department of Chemistry and Chemical Biology, Rutgers University, 123 Bevier Road, Piscataway, New Jersey 08854, United States
      *[email protected]
      More by Jing Li
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    ACS Energy Letters

    Cite this: ACS Energy Lett. 2021, 6, 7, 2565–2574
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    https://doi.org/10.1021/acsenergylett.1c00993
    Published June 28, 2021
    Copyright © 2021 American Chemical Society

    Abstract

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    Perovskite-based light-emitting diodes (PeLEDs) are promising candidates for next-generation solid-state lighting and display technologies. However, all current high-performance PeLEDs contain a toxic element (lead) and suffer from relatively low stability. Herein, we report a new type of lead-free LED using low-cost, eco-friendly, and robust copper(I) iodide hybrid material as the emissive layer (EML). Specifically, they are composed of copper iodide chains and organic ligands through ionic and coordinate bonds. Their remarkable stability and solution processability stem from this unique multifold bonding feature. High-quality thin films of 1D-Cu4I6(bttmp)2 were fabricated by a simple, one-step spin-coating process. They exhibit high photoluminescence quantum yield (91%) and long-term air stability (>2000 h). An EQE of 5.02% was achieved for a prototype yellow LED using 1D-Cu4I6(bttmp)2 EML. Its half-lifetime of 35.5 h obtained in open air outperforms that of most PeLEDs reported to date. This work opens a new direction for making LEDs based on ecofriendly and robust hybrid materials.

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    • Figures S1–S32; Tables S1–S9; and detailed descriptions on the ligand synthesis, crystal growth, device fabrication, material characterization, calculation methods, and device performance evaluation (PDF)

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    Cited By

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    This article is cited by 60 publications.

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    ACS Energy Letters

    Cite this: ACS Energy Lett. 2021, 6, 7, 2565–2574
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsenergylett.1c00993
    Published June 28, 2021
    Copyright © 2021 American Chemical Society

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