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<p>Multiple resonance thermally activated delayed fluorescence (MR-TADF) materials featuring narrowband emission and high luminescence efficiency hold great promise for ultra-high-definition displays. However, red MR emitter-based organic light-emitting diodes (OLEDs) commonly suffer from pronounced efficiency roll-off due to intrinsically slow reverse intersystem crossing (RISC), which severely hinders their practical application. Herein, we present efficient OLEDs based on a selenium-embedded red MR framework featuring fast RISC, which not only serves as a high-performance emitter but also functions as a sensitizer. The emitter (tFSeBN) shows red emission at 607 nm and achieves a record-high RISC rate of 7.5 × 10<sup>5</sup> s<sup>–</sup><sup>1</sup>. The corresponding OLED delivers a maximum external quantum efficiency (EQE<sub>max</sub>) of 34.7% and maintains high EQE values of 31.0% and 25.6% at luminance levels of 1000 and 10,000 cd m<sup>−2</sup>, highlighting its ultra-low efficiency roll-off. Owing to its high tolerance to doping concentration and accelerated RISC, tFSeBN further serves as an efficient sensitizer in hyperfluorescent OLEDs, enabling pure-red emission with CIE coordinates of (0.70, 0.30), high EQE and suppressed efficiency roll-off. This work provides a viable pathway to address the long-standing efficiency roll-off issue in red MR-OLEDs, serving as an alternative to conventional noble-metal-sensitized architectures for the red OLED industry.</p>

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Red OLED with efficiency of 25.6% at 10,000 cd m−2 based on selenium embedding multiple resonance framework

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月8日

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  • Yexuan Pu,
  • Xinliang Cai,
  • Chenglong Li,
  • Baoyan Liang,
  • Hai Bi,
  • Yue Wang

摘要

Multiple resonance thermally activated delayed fluorescence (MR-TADF) materials featuring narrowband emission and high luminescence efficiency hold great promise for ultra-high-definition displays. However, red MR emitter-based organic light-emitting diodes (OLEDs) commonly suffer from pronounced efficiency roll-off due to intrinsically slow reverse intersystem crossing (RISC), which severely hinders their practical application. Herein, we present efficient OLEDs based on a selenium-embedded red MR framework featuring fast RISC, which not only serves as a high-performance emitter but also functions as a sensitizer. The emitter (tFSeBN) shows red emission at 607 nm and achieves a record-high RISC rate of 7.5 × 105 s–1. The corresponding OLED delivers a maximum external quantum efficiency (EQEmax) of 34.7% and maintains high EQE values of 31.0% and 25.6% at luminance levels of 1000 and 10,000 cd m−2, highlighting its ultra-low efficiency roll-off. Owing to its high tolerance to doping concentration and accelerated RISC, tFSeBN further serves as an efficient sensitizer in hyperfluorescent OLEDs, enabling pure-red emission with CIE coordinates of (0.70, 0.30), high EQE and suppressed efficiency roll-off. This work provides a viable pathway to address the long-standing efficiency roll-off issue in red MR-OLEDs, serving as an alternative to conventional noble-metal-sensitized architectures for the red OLED industry.