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Functionalized PFN-X (X = Cl, Br, or I) for Balanced Charge Carriers of Highly Efficient Blue Light-Emitting Diodes

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    Surfaces, Interfaces, and Applications

    Functionalized PFN-X (X = Cl, Br, or I) for Balanced Charge Carriers of Highly Efficient Blue Light-Emitting Diodes
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    • Yun Seop Shin
      Yun Seop Shin
      Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      More by Yun Seop Shin
    • Yung Jin Yoon
      Yung Jin Yoon
      Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      More by Yung Jin Yoon
    • Jungwoo Heo
      Jungwoo Heo
      Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      More by Jungwoo Heo
    • Suhee Song
      Suhee Song
      Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      More by Suhee Song
    • Jae Won Kim
      Jae Won Kim
      Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      More by Jae Won Kim
    • Song Yi Park
      Song Yi Park
      Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      More by Song Yi Park
    • Hye Won Cho
      Hye Won Cho
      Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      More by Hye Won Cho
    • Gi-Hwan Kim*
      Gi-Hwan Kim
      School of Materials Science and Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
      *Email: [email protected]
      More by Gi-Hwan Kim
    • Jin Young Kim*
      Jin Young Kim
      Perovtronics Research Center, Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      *Email: [email protected]
      More by Jin Young Kim
      Orcidhttp://orcid.org/0000-0002-6595-4468
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2020, 12, 31, 35740–35747
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    https://doi.org/10.1021/acsami.0c09968
    Published July 7, 2020
    Copyright © 2020 American Chemical Society
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    Abstract

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    All-inorganic perovskite nanocrystals (PeNCs), CsPbX3 (X = Cl, Br, or I), have been considered as one of the prospective emissive materials for display applications, which showed superior photoluminescence quantum yield and high color purity with narrow spectral line width. Recently, high-performance green and red perovskite light-emitting diodes (PeLEDs) were introduced; however, the efficiency of blue PeLEDs still lagged owing to PeNCs’ deep HOMO energy level (∼6.0 eV), which is in discord with the adjacent organic interlayer. In this work, we demonstrated an interfacial engineering strategy with conjugated polyelectrolytes, functionalized PFN (poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]) with halide anions, between the hole injection layer and PeNCs. By introducing PFN-X (X = Cl, Br, or I), they exhibit well-balanced charge carriers and resultant effective radiative recombination in the PeNC layer with reduced hole injection barrier and electron blocking behavior. Among them, in particular, the PFN-Cl-treated PeLEDs display a maximum external quantum efficiency of 1.34% at 470 nm electroluminescence emission with enhanced spectral operating stability.

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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/acsami.0c09968.

    • Further characterizations of PFN-Cl, PFN-Br, and PFN-I (XPS, 1H-NMR, and UV–vis absorption spectra), images of the deposited perovskite nanocrystal film, device characteristics with varying CPE concentrations, DFT calculation results (relaxed ground states of CPE monomer units), J–V characteristics of the single carrier devices, AFM images of the poly-TPD and device characteristics with and without methanol solvent treatment, and electroluminescence spectra characteristics (peak positions and full width at half-maximum) (PDF)

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    Cited By

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    This article is cited by 36 publications.

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2020, 12, 31, 35740–35747
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.0c09968
    Published July 7, 2020
    Copyright © 2020 American Chemical Society
    Request reuse permissions

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