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<p>Despite significant progress in perovskite light-emitting diode (PeLED) technology, the development of blue PeLEDs remains comparatively limited. A major challenge is the scarcity of hole-transport materials (HTMs) that simultaneously provide suitable energy-level alignment with blue perovskite emitters and efficient hole-transport capability. Here, we present a fluorene-expanded arylamine-type polymer, OctMef, as an effective alternative to the conventional HTM of poly[(9,9-dioctylfluorenyl-2,7-diyl)-<i>co</i>-(4,4′-(N-(4-<i>s</i>-butylphenyl)diphenylamine)) (TFB) in blue PeLEDs based on (Cs<sub>0.85</sub>FA<sub>0.15</sub>)Pb(Br<sub>0.80</sub>Cl<sub>0.20</sub>)<sub>3</sub> perovskite quantum dots. OctMef is designed by incorporating rigid 9,9-dimethylfluorenyl substituents into a TFB-derived backbone, thereby significantly enhancing the hole mobility by more than 20-fold compared with TFB and facilitating efficient hole-transport. As a consequence of these overall improvements, the blue PeLEDs employing OctMef as hole-transport layer exhibit an external quantum efficiency of 5.09% at 485&#xa0;nm, which is more than twice that of TFB-based devices. In addition, the OctMef-based devices show a significantly lower turn-on voltage of 2.29&#xa0;V compared with 3.06&#xa0;V for the TFB-based devices.</p> Graphical abstract <p></p>

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Fluorene-expanded arylamine hole-transport polymer with enhanced mobility for improved blue perovskite LEDs

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Jinseok Lee,
  • Hyejin Na,
  • Chanbin Park,
  • Seon Joo Lee,
  • Jaemin Lee

摘要

Despite significant progress in perovskite light-emitting diode (PeLED) technology, the development of blue PeLEDs remains comparatively limited. A major challenge is the scarcity of hole-transport materials (HTMs) that simultaneously provide suitable energy-level alignment with blue perovskite emitters and efficient hole-transport capability. Here, we present a fluorene-expanded arylamine-type polymer, OctMef, as an effective alternative to the conventional HTM of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4′-(N-(4-s-butylphenyl)diphenylamine)) (TFB) in blue PeLEDs based on (Cs0.85FA0.15)Pb(Br0.80Cl0.20)3 perovskite quantum dots. OctMef is designed by incorporating rigid 9,9-dimethylfluorenyl substituents into a TFB-derived backbone, thereby significantly enhancing the hole mobility by more than 20-fold compared with TFB and facilitating efficient hole-transport. As a consequence of these overall improvements, the blue PeLEDs employing OctMef as hole-transport layer exhibit an external quantum efficiency of 5.09% at 485 nm, which is more than twice that of TFB-based devices. In addition, the OctMef-based devices show a significantly lower turn-on voltage of 2.29 V compared with 3.06 V for the TFB-based devices.

Graphical abstract