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Highly Efficient, Simplified, Solution-Processed Thermally Activated Delayed-Fluorescence Organic Light-Emitting

Young-Hoon Kim1, Christoph Wolf1, Himchan Cho1

  • 1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk, 790-784, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|December 1, 2015
PubMed
Summary

Simplified, solution-processed organic light-emitting diodes achieve high efficiency using pure-organic thermally activated delayed fluorescence emitters and a novel buffer layer. This approach enables high external quantum efficiency (EQE) and current efficiency for red and blue light emission.

Keywords:
buffer hole-injection layerexciton quenchinghigh efficiencyorganic light-emitting diodesthermally activated delayed-fluorescence

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Organic light-emitting diodes (OLEDs) are crucial for displays and lighting.
  • Achieving high efficiency and color purity in OLEDs remains a key challenge.
  • Thermally activated delayed fluorescence (TADF) offers a pathway to overcome the efficiency limitations of conventional fluorescence.

Purpose of the Study:

  • To develop highly efficient, solution-processed OLEDs using TADF emitters.
  • To simplify OLED fabrication through solution processing.
  • To demonstrate high performance using a multifunctional buffer hole-injection layer.

Main Methods:

  • Utilized pure-organic TADF emitters.
  • Employed a multifunctional buffer hole-injection layer.
  • Fabricated devices via solution processing.

Main Results:

  • Achieved high external quantum efficiency (EQE) of approximately 24%.
  • Demonstrated high current efficiency of approximately 73 cd A⁻¹.
  • Successfully fabricated high-efficiency red- and blue-emitting OLED devices.

Conclusions:

  • Solution-processed TADF OLEDs offer a simplified and efficient fabrication route.
  • The multifunctional buffer layer is key to achieving high device performance.
  • This approach is viable for fabricating high-efficiency red and blue OLEDs.