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Stretchable Primary-Blue Color-Conversion Layer: In Situ Crystallization of Phase-Engineered Perovskite Nanocrystals in an Organic Matrix

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    Stretchable Primary-Blue Color-Conversion Layer: In Situ Crystallization of Phase-Engineered Perovskite Nanocrystals in an Organic Matrix
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    • Jun-Su Yeo
      Jun-Su Yeo
      Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
      More by Jun-Su Yeo
    • Eun-Ha Cho
      Eun-Ha Cho
      Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
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    • Joo Yoon Woo
      Joo Yoon Woo
      Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
      More by Joo Yoon Woo
    • Yong Min Park
      Yong Min Park
      Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
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    • Joo Hyeong Han
      Joo Hyeong Han
      Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
      More by Joo Hyeong Han
    • Daehwan Kim
      Daehwan Kim
      Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
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    • Won Bin Im
      Won Bin Im
      Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
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      Orcidhttps://orcid.org/0000-0003-2473-4714
    • Tae-Hee Han*
      Tae-Hee Han
      Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
      Department of Display Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
      *Email: [email protected]
      More by Tae-Hee Han
      Orcidhttps://orcid.org/0000-0002-1939-8296
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    ACS Nano

    Cite this: ACS Nano 2025, 19, 1, 406–417
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    https://doi.org/10.1021/acsnano.4c08640
    Published December 29, 2024
    Copyright © 2024 American Chemical Society
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    Abstract

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    Although the use of ultraviolet (UV) light-emitting diode backlight with red, green, and blue color-conversion layers (CCLs) in displays simplifies the manufacturing process and improves display uniformity, research on blue CCLs remains limited and has been mostly reported in the sky-blue region (> 470 nm), which is insufficient to satisfy the Rec. 2020 color standard. As halide perovskites offer a high extinction coefficient, color purity, and photoluminescence quantum yield (PLQY), they become highly competitive color-converting materials for CCLs. This work presents a simple method for the in situ fabrication of perovskite nanocrystal (NC) films for primary-blue CCL and additionally proposes a set of scientific guidance rules regarding significant factors that affect the nucleation and in situ crystallization kinetics of perovskite NCs. The fabricated films are highly stretchable, emit bright primary-blue light (∼460 nm), and have PL that is tolerant to UV irradiation. By introducing fluorinated arylammonium salts, the quantum and dielectric confinement effects are desirably adjusted, which induces efficient energy transfer processes for primary-blue emission. This strategy yields phase-engineered perovskite NCs embedded in an organic matrix, which enables spectrally stable and robust PL under high tensile strain (> 250%) and after prolonged UV irradiation (> 40 d). Consequently, this work demonstrates that the in situ fabricated stretchable blue CCLs achieve 100% agreement with Rec. 2020.

    Copyright © 2024 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/acsnano.4c08640.

    • Photoluminescence (PL) spectra, ultraviolet–visible (UV–vis) absorption spectra, Tauc plot, X-ray diffraction (XRD) measurement data, scanning electron microscopy (SEM) images, and time-resolved PL parameter tables of CsPbBr3 with different ammonium halide salts. PL and UV–vis absorption spectra of CsPbBr3 with 4FPEACl according to different host-solvents and antisolvents. Comparison of phase distribution in different perovskite thin films. Mechanical stability of CsPbBr3 with various compositions of bulky arylammonium halides and white-lighting application. Color-conversion efficiency of CsPbBr3 with 4FPEACl. Schematic illustration of phase formation according to different precursor compositions or precursor–solvent interaction (PDF)

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    ACS Nano

    Cite this: ACS Nano 2025, 19, 1, 406–417
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsnano.4c08640
    Published December 29, 2024
    Copyright © 2024 American Chemical Society
    Request reuse permissions

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