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High-Efficiency and Narrowband Green Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes Based on Two Diverse Boron Multi-Resonant Skeletons.

Zhen WangCheng QuJie LiangXuming ZhuangYu LiuYue Wang
Published in: Molecules (Basel, Switzerland) (2024)
Up to now, highly efficient narrowband thermally activated delayed fluorescence (TADF) molecules constructed by oxygen-bridged boron with an enhancing multiple resonance (MR) effect have been in urgent demand for solid-state lighting and full-color displays. In this work, a novel MR-TADF molecule, BNBO, constructed by the oxygen-bridged boron unit and boron-nitrogen core skeleton as an electron-donating moiety, is successfully designed and synthesized via a facile one-step synthesis. Based on BNBO as an efficient green emitter, the organic light-emitting diode (OLED) shows a sharp emission peak of 508 nm with a full-width at half-maximum (FWHM) of 36 nm and realizes quite high peak efficiency values, including an external quantum efficiency (EQE max ) of 24.3% and a power efficiency (PE max ) of 62.3 lm/W. BNBO possesses the intramolecular charge transfer (ICT) property of donor-acceptor (D-A) materials and multiple resonance characteristics, which provide a simple strategy for narrowband oxygen-boron materials.
Keyphrases
  • energy transfer
  • light emitting
  • highly efficient
  • quantum dots
  • solid state
  • high efficiency
  • wastewater treatment
  • contrast enhanced
  • magnetic resonance imaging
  • single molecule
  • water soluble
  • monte carlo