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Related Experiment Video

Updated: Dec 23, 2025

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Efficient Aggregation-Induced Delayed Fluorescence Luminogens for Solution-Processed OLEDs With Small Efficiency

Zheyi Cai1, Hao Chen1, Jingjing Guo1

  • 1State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence From Molecular Aggregates, Guangzhou, China.

Frontiers in Chemistry
|April 23, 2020
PubMed
Summary

New organic molecules with aggregation-induced delayed fluorescence (AIDF) offer high efficiency for organic light-emitting diodes (OLEDs). These emitters demonstrate excellent efficiency stability, overcoming challenges in OLED performance.

Keywords:
aggregation-induced delayed fluorescenceefficiency roll-offelectroluminescenceorganic light-emitting diodesthermally activated delayed fluorescence

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Organic light-emitting diodes (OLEDs) utilize organic small molecules for light emission.
  • Thermally-activated delayed fluorescence (TADF) emitters offer high efficiency but suffer from roll-off at high voltages.
  • Aggregation-induced emission (AIE) is a phenomenon where molecules emit light in aggregated states.

Purpose of the Study:

  • To design and synthesize novel purely organic emitters with aggregation-induced delayed fluorescence (AIDF) characteristics.
  • To investigate the photophysical and electroluminescent properties of these new emitters.
  • To fabricate and evaluate OLED devices using these emitters, focusing on efficiency and stability.

Main Methods:

  • Synthesis of two new organic emitters incorporating electron-withdrawing benzoyl and electron-donating phenoxazine/9,9-dihexylfluorene units.
  • Characterization of electronic structures, thermal stability, electrochemical behavior, and photoluminescence properties.
  • Fabrication and testing of both solution-processed and vacuum-deposited OLED devices.

Main Results:

  • The synthesized emitters exhibit weak fluorescence in solution but strong delayed fluorescence in the aggregated state (AIDF).
  • Solution-processed OLEDs achieved a high external quantum efficiency (EQE) of 14.69%.
  • Vacuum-deposited OLEDs showed a comparable EQE of 14.86% with significantly reduced efficiency roll-off (0.2% at 1,000 cd m⁻²).

Conclusions:

  • Purely organic emitters with AIDF properties are promising for high-performance OLEDs.
  • The developed emitters demonstrate excellent efficiency stability, addressing a key challenge in OLED technology.
  • AIDF is an effective strategy for achieving efficient and stable purely organic OLEDs, particularly for solution processing.