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<p>Perovskite light-emitting diodes are promising for next-generation ultrahigh-definition displays, yet efficient pure-red emission (620-650 nm) with high spectral purity remains challenging, with emission linewidths commonly exceeding 30 nm. CsPbI<sub>3</sub> nanoplatelets feature the potential for narrow-linewidth emission owing to strong vertical quantum confinement and atomic-level flat surface. Nonetheless, the dynamic motion of native long-chain oleylamine exacerbates lattice vibrations in ultrathin soft lattices, inducing strong electron-phonon coupling and undermining optical advantages. Here, we introduce the rigid 4-(2-aminoethyl)benzenesulfonamide molecule, which partially replaces oleylamine and vertically anchors on the nanoplatelets, sterically restricting the dynamic motion of neighboring oleylamine, thereby mitigating electron-phonon coupling. The resulting light-emitting diodes achieve pure-red electroluminescence at 641 nm with a narrow linewidth of 24 nm, an average external quantum efficiency of 23.2 ± 2.4% (maximum 29.8%), and an operational lifetime of 128.2 h. This work underscores the critical role of electron-phonon coupling modulation in optimizing perovskite optoelectronic devices.</p>

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Suppressing electron-phonon coupling in perovskite nanoplatelets for efficient pure-red light-emitting diodes with narrow spectral emission

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月9日

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  • Qingzhao Hua,
  • Zirui Liu,
  • Sheng Wang,
  • Mengyang Xia,
  • Chenglin He,
  • Liang Liu,
  • Zheyuan Xu,
  • Zilan Tang,
  • Wenlong Jiang,
  • Ying Jiang,
  • Fan Cao,
  • Xiaoxia Wang,
  • Xuyong Yang,
  • Anlian Pan

摘要

Perovskite light-emitting diodes are promising for next-generation ultrahigh-definition displays, yet efficient pure-red emission (620-650 nm) with high spectral purity remains challenging, with emission linewidths commonly exceeding 30 nm. CsPbI3 nanoplatelets feature the potential for narrow-linewidth emission owing to strong vertical quantum confinement and atomic-level flat surface. Nonetheless, the dynamic motion of native long-chain oleylamine exacerbates lattice vibrations in ultrathin soft lattices, inducing strong electron-phonon coupling and undermining optical advantages. Here, we introduce the rigid 4-(2-aminoethyl)benzenesulfonamide molecule, which partially replaces oleylamine and vertically anchors on the nanoplatelets, sterically restricting the dynamic motion of neighboring oleylamine, thereby mitigating electron-phonon coupling. The resulting light-emitting diodes achieve pure-red electroluminescence at 641 nm with a narrow linewidth of 24 nm, an average external quantum efficiency of 23.2 ± 2.4% (maximum 29.8%), and an operational lifetime of 128.2 h. This work underscores the critical role of electron-phonon coupling modulation in optimizing perovskite optoelectronic devices.