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Rationally Designed Multi-Resonance Emitters Achieving >42% EQE in Ultra-Green OLEDs.

Guo-Wei Chen1,2, Xin-Yi Zeng2, Yaozu Su1

  • 1School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|April 20, 2026
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This summary is machine-generated.

Researchers developed a novel molecular design for ultra-high-definition green emitters in organic electronics. This strategy enhances efficiency and color purity, crucial for advanced display technologies.

Area of Science:

  • Organic Electronics
  • Materials Science
  • Display Technology

Background:

  • Achieving narrow-band, efficient green emission for ultra-high-definition displays is challenging.
  • Current limitations include balancing emission characteristics with exciton harvesting and light outcoupling.

Purpose of the Study:

  • To introduce a molecular design strategy for high-performance ultra-green organic light-emitting diodes (OLEDs).
  • To overcome limitations in achieving narrow emission, efficient exciton utilization, and high light outcoupling.

Main Methods:

  • Employed a fluorene bridge to rigidify a BNCz-based emitter core.
  • Incorporated a planar N-phenyl-carbazol-3-yl group to enforce horizontal dipole orientation.
  • Utilized steric shielding to prevent aggregation and quenching.
Keywords:
multiple resonancenarrowband green emissionorganic light‐emitting diodesteric shieldingthrough‐space charge transfer

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Main Results:

  • Achieved ultragreen emission with CIE coordinates near the BT.2020 standard.
  • Attained a maximum external quantum efficiency (EQE) of 39.6% for the emitter.
  • Demonstrated a record 42.2% EQE in a device with a thermally activated delayed fluorescence sensitizer, showing suppressed roll-off.

Conclusions:

  • The molecular design principle enables simultaneous optimization of emission color, exciton harvesting, and light outcoupling.
  • This approach is vital for developing next-generation high-resolution OLED displays.
  • The study provides a pathway for advanced organic electronic emitters.