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<p>Despite rapid advancements in the field of perovskite light-emitting diodes (Pe-LEDs), research on polymer hole transport materials (HTMs), a key component of these devices, remains limited. In this study, we developed two new polymer HTMs by substituting the <i>sec</i>-butyl group in the triphenylamine moiety of poly[(9,9-dioctylfluorenyl-2,7-diyl)-<i>co</i>-(4,4′-(N-(4-<i>sec</i>-butylphenyl)diphenylamine)] (TFB) with either an SCH<sub>3</sub> or OCH<sub>3</sub> group, resulting in OctSMe or OctOMe, respectively. The optical and electrical properties of these new HTMs were thoroughly characterized by various methods. When incorporated into green Pe-LED devices, the new HTMs achieved over 1.6 times higher luminance and a 10–20% reduction in efficiency roll-off compared to the reference TFB, attributed to smoother hole injection and improved energy-level alignment. These enhancements in device performance were further supported by hole-only device experiments and time-resolved photoluminescence analysis. Additionally, devices with the new HTMs demonstrated longer lifetimes than those with TFB, underscoring their potential as effective alternatives in Pe-LED applications.</p> Graphic Abstract <p></p>

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Tailoring hole transport polymers with substituent control for green perovskite LEDs with increased luminance and reduced efficiency roll-off

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Chanbin Park,
  • Young Seo Cho,
  • Gwang-il Kim,
  • Yurim Mo,
  • Seon Joo Lee,
  • Hyejin Na,
  • Sungho Choi,
  • Jaemin Lee

摘要

Despite rapid advancements in the field of perovskite light-emitting diodes (Pe-LEDs), research on polymer hole transport materials (HTMs), a key component of these devices, remains limited. In this study, we developed two new polymer HTMs by substituting the sec-butyl group in the triphenylamine moiety of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-sec-butylphenyl)diphenylamine)] (TFB) with either an SCH3 or OCH3 group, resulting in OctSMe or OctOMe, respectively. The optical and electrical properties of these new HTMs were thoroughly characterized by various methods. When incorporated into green Pe-LED devices, the new HTMs achieved over 1.6 times higher luminance and a 10–20% reduction in efficiency roll-off compared to the reference TFB, attributed to smoother hole injection and improved energy-level alignment. These enhancements in device performance were further supported by hole-only device experiments and time-resolved photoluminescence analysis. Additionally, devices with the new HTMs demonstrated longer lifetimes than those with TFB, underscoring their potential as effective alternatives in Pe-LED applications.

Graphic Abstract