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<p>The pursuit of straightforward yet efficient ultraviolet (UV) organic emitters remains a critical challenge within the realm of organic light-emitting diodes (OLEDs) that must simultaneously achieve high efficiency, minimal roll-off, and good color purity. Herein, we propose a reliable strategy to develop simple and effective bipolar donor’-donor-acceptor type UV emitters (3-mPPIC9N and 2-mPPIC9N), featuring a hybridized local and charge-transfer excited state, based on precise dipole moment engineering. Both of them exhibit remarkably high photoluminescence quantum yields of 95% and 92%, respectively. Notably, the 3-mPPIC9N with a low ground-state dipole moment affords significantly reduced non-radiative transition and weak π-π stacking interactions. The device incorporating 3-mPPIC9N exhibits narrowband UV emission with a peak at 390 nm, a full width at half maximum of 40 nm, and color coordinates of (0.166, 0.027). More impressively, the device achieves a remarkable external quantum efficiency (EQE) of 9.65%, as well as an unprecedentedly low efficiency roll-off, maintaining EQEs of 9.26% and 8.47% at 1000 and 2000 cd m<sup>−2</sup>, respectively, which ranks among the highest efficiencies ever reported for UV-OLEDs operating at high brightness levels. Our work establishes a new benchmark in this field and paves the way for the accelerated commercialization of high-performance UV-OLEDs.</p>

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Simple and efficient donor’-donor-acceptor type ultraviolet electroluminescence fluorophores with an EQE beyond 9.2% at 1000 Nit

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Hao Huang,
  • Runjie Ding,
  • Yintong Liu,
  • Danyu Xie,
  • Ling Peng,
  • Yuchao Liu,
  • Junjie Wang,
  • Shian Ying,
  • Dongge Ma,
  • Shouke Yan

摘要

The pursuit of straightforward yet efficient ultraviolet (UV) organic emitters remains a critical challenge within the realm of organic light-emitting diodes (OLEDs) that must simultaneously achieve high efficiency, minimal roll-off, and good color purity. Herein, we propose a reliable strategy to develop simple and effective bipolar donor’-donor-acceptor type UV emitters (3-mPPIC9N and 2-mPPIC9N), featuring a hybridized local and charge-transfer excited state, based on precise dipole moment engineering. Both of them exhibit remarkably high photoluminescence quantum yields of 95% and 92%, respectively. Notably, the 3-mPPIC9N with a low ground-state dipole moment affords significantly reduced non-radiative transition and weak π-π stacking interactions. The device incorporating 3-mPPIC9N exhibits narrowband UV emission with a peak at 390 nm, a full width at half maximum of 40 nm, and color coordinates of (0.166, 0.027). More impressively, the device achieves a remarkable external quantum efficiency (EQE) of 9.65%, as well as an unprecedentedly low efficiency roll-off, maintaining EQEs of 9.26% and 8.47% at 1000 and 2000 cd m−2, respectively, which ranks among the highest efficiencies ever reported for UV-OLEDs operating at high brightness levels. Our work establishes a new benchmark in this field and paves the way for the accelerated commercialization of high-performance UV-OLEDs.