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Related Experiment Video

Updated: Dec 15, 2025

Development of Efficient OLEDs from Solution Deposition
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Solution-Processable Csp3-Annulated Hosts for High-Efficiency Deep Red Phosphorescent OLEDs.

Feiling Yu1, Qian Liu1, Yongjian Sheng1

  • 1Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.

ACS Applied Materials & Interfaces
|July 7, 2020
PubMed
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Researchers developed a novel cohost system using Csp3-annulated phenylquinoline derivatives for highly efficient saturated red phosphorescent organic light-emitting diodes (OLEDs). These new materials enable high external quantum efficiency, paving the way for advanced wet-made displays.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Development of efficient phosphorescent emitters is crucial for advanced organic light-emitting diodes (OLEDs).
  • Solution-processable host materials are needed to enable cost-effective fabrication of high-performance OLED displays.

Purpose of the Study:

  • To develop a solution-processable cohost system for highly efficient saturated red phosphorescent OLEDs.
  • To investigate the impact of molecular flexibility in Csp3-annulated phenylquinoline derivatives on device performance.

Main Methods:

  • Synthesis and characterization of novel Csp3-annulated phenylquinoline derivatives (IAIQ, PAIQ, m-TPA-DPIQ) as cohost materials.
  • Fabrication of phosphorescent OLED devices using these cohosts and an iridium-based emitter [Ir(mpiq)2divm].
Keywords:
Csp3-annulatedcohostsdeep red phosphorescencephenylquinoline derivativessolution-processable OLEDs

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  • Systematic investigation of device performance, including electroluminescence spectra, Commission Internationale de L'Eclairage coordinates, and external quantum efficiency (EQE).

    • Main Results:

    • Successfully fabricated solution-processable OLED devices exhibiting electroluminescent peaks at 634-636 nm with CIE coordinates of (0.70, 0.30).
    • Devices incorporating IAIQ, PAIQ, and m-TPA-DPIQ achieved high maximum EQEs of 25.1%, 23.4%, and 23.3%, respectively.
    • All devices maintained EQEs exceeding 18% at a luminance of 1000 cd/m², demonstrating excellent performance and stability.

    Conclusions:

    • The developed Csp3-annulated phenylquinoline derivatives serve as effective cohost materials for high-efficiency saturated red phosphorescent OLEDs.
    • The molecular design strategy enhances excitonic properties and facilitates the construction of cohost systems for superior OLED performance.
    • These findings support the advancement of wet-made displays and high-quality phosphorescent OLED technology.