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Solution-Processed Blue Narrowband OLED Devices with External Quantum Efficiency Beyond 35 % through Horizontal

Kaiyuan Zhang1,2, Xingdong Wang1, Mengyu Wang1,2

  • 1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.

Angewandte Chemie (International Ed. in English)
|January 8, 2025
PubMed
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Researchers developed a new electrostatic strategy to improve solution-processed multiple resonance thermally activated delayed fluorescence (MR-TADF) devices. This method enhances horizontal dipole orientation, boosting efficiency and color purity in blue MR-TADF applications.

Area of Science:

  • Organic electronics
  • Materials science
  • Photophysics

Background:

  • Multiple resonance thermally activated delayed fluorescence (MR-TADF) devices offer high efficiency and color purity.
  • Solution-processed MR-TADF devices lag behind vacuum-deposited ones due to poor horizontal dipole orientation and low light out-coupling.
  • Achieving controlled emitter orientation in solution processing is crucial for device performance.

Purpose of the Study:

  • To develop a novel strategy for enhancing the efficiency of solution-processed MR-TADF devices.
  • To achieve a high horizontal emitting dipole orientation (Θ||) in solution-processed films.
  • To improve the light out-coupling efficiency and overall performance of blue MR-TADF devices.

Main Methods:

  • Utilized electrostatic interactions between a dendritic host with high positive electrostatic potential (ESP) and a dendritic emitter with negative ESP sites.
Keywords:
electrostatic interactionhorizontal emitting dipole orientationmultiple resonance thermally activated delayed fluorescencepure blue narrowband OLEDssolution process

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  • Designed a host-emitter system where the host's planar structure and positive ESP sites attract the emitter's negative ESP sites, inducing horizontal dipole orientation.
  • Employed highly twisted dendritic hosts and dendron encapsulation to suppress emitter aggregation.

    • Main Results:

    • Achieved a high horizontal dipole ratio (Θ||) of 83.0% in solution-processed films.
    • Obtained a high photoluminescence quantum yield of 98.6% due to suppressed aggregation.
    • Demonstrated record-breaking external quantum efficiency of 35.3% for solution-processed blue MR-TADF devices.
    • Exhibited a narrow emission bandwidth of 17 nm and pure blue color (CIE: 0.137, 0.176).

    Conclusions:

    • The proposed electrostatic interaction strategy effectively controls emitter dipole orientation in solution-processed MR-TADF films.
    • This approach significantly enhances the efficiency and color purity of solution-processed blue MR-TADF devices, rivaling vacuum-deposited counterparts.
    • The findings pave the way for high-performance, solution-processable organic light-emitting diodes (OLEDs).