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Efficient pure-red multiple resonance emitter based on a donor planarization strategy.

Linjie Li1, Yincai Xu1, Dongyue Zhang2

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University Changchun 130012 P. R. China chenglongli@jlu.edu.cn ycxu17@mails.jlu.edu.cn.

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Developing efficient pure-red emitters for displays is challenging. This study introduces a planarization strategy for multiple resonance thermally activated delayed fluorescence (MR-TADF) materials, achieving a significant red shift and narrow bandwidth for improved OLED performance.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Efficient pure-red multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters for vacuum thermal evaporation are scarce, limiting ultra-high-definition display color gamuts.
  • Current MR-TADF designs using single-bond donors exhibit torsional flexibility, leading to limited red shifts, high molecular weights, and broad emission bandwidths.

Purpose of the Study:

  • To develop a novel donor planarization strategy for creating efficient, narrowband pure-red MR-TADF emitters.
  • To enhance π-conjugation and charge transfer effects for red-shifted emission and improved molecular planarity.

Main Methods:

  • Intramolecularly fused a donor group with the MR core to create a planar structural framework.
  • Synthesized and characterized the proof-of-concept emitter RBN-ICz.
  • Fabricated and evaluated an organic light-emitting diode (OLED) using the RBN-ICz emitter.

Main Results:

  • The RBN-ICz emitter achieved a 96 nm red shift (519 to 615 nm) and a reduced emission bandwidth (0.15 eV).
  • RBN-ICz demonstrated the lowest molecular weight among reported red MR-TADF materials.
  • The RBN-ICz-based OLED achieved a 34.1% external quantum efficiency (EQE) with CIE coordinates (0.67, 0.33), meeting NTSC red standards.

Conclusions:

  • Donor planarization via intramolecular fusion is an effective strategy for developing high-efficiency, narrowband red MR-TADF emitters.
  • This approach overcomes limitations of previous designs, enabling significant red shifts and narrow bandwidths.
  • The developed RBN-ICz emitter shows great promise for next-generation OLED displays requiring wide color gamuts.