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<p>The pure organic multiple resonance thermally activated delayed fluorescence (MR-TADF) materials are the most promising for ultra-high-definition (UHD) displays of BT.2020 color gamut, owing to their narrowband emission and high efficiency. However, the efficiency roll-offs for MR-TADF-based organic light-emitting diode (OLED) devices are too severe for industrial applications. In this contribution, an MR-TADF emitter, named Th-Cz-BN, is proposed by coordinately regulating the photophysical processes, which exhibit both rapid rates of radiative transition (1.4 × 10<sup>8</sup> s<sup>−1</sup>) and reverse intersystem crossing (3.6 × 10<sup>5</sup> s<sup>−1</sup>). The Th-Cz-BN-based non-sensitized device exhibits a maximum external quantum efficiency (EQE) of 35.6%, with efficiency roll-offs of only 0.3% and 11.2% at 100 and 1000 cd m<sup>−2</sup>, respectively. Additionally, Th-Cz-BN is utilized as an MR-TADF sensitizer, and the Th-Cz-BN-sensitized device exhibits a maximum EQE of 37.8%, which remains at 29.6% at 1000 cd m<sup>−2</sup>. The results underscore the significance of coordinately regulating the photophysical processes of MR-TADF materials and pave the way for high-performance MR-TADF emitters and sensitizers.</p>

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Highly efficient narrowband OLEDs with very small efficiency roll-offs based on a multiple-resonance thermally activated delayed fluorescence emitter

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Yufang Nie,
  • Chao Jiang,
  • Zhiqiang Li,
  • Xuming Zhuang,
  • Baoyan Liang,
  • Yue Wang

摘要

The pure organic multiple resonance thermally activated delayed fluorescence (MR-TADF) materials are the most promising for ultra-high-definition (UHD) displays of BT.2020 color gamut, owing to their narrowband emission and high efficiency. However, the efficiency roll-offs for MR-TADF-based organic light-emitting diode (OLED) devices are too severe for industrial applications. In this contribution, an MR-TADF emitter, named Th-Cz-BN, is proposed by coordinately regulating the photophysical processes, which exhibit both rapid rates of radiative transition (1.4 × 108 s−1) and reverse intersystem crossing (3.6 × 105 s−1). The Th-Cz-BN-based non-sensitized device exhibits a maximum external quantum efficiency (EQE) of 35.6%, with efficiency roll-offs of only 0.3% and 11.2% at 100 and 1000 cd m−2, respectively. Additionally, Th-Cz-BN is utilized as an MR-TADF sensitizer, and the Th-Cz-BN-sensitized device exhibits a maximum EQE of 37.8%, which remains at 29.6% at 1000 cd m−2. The results underscore the significance of coordinately regulating the photophysical processes of MR-TADF materials and pave the way for high-performance MR-TADF emitters and sensitizers.