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Updated: Aug 27, 2025

Development of Efficient OLEDs from Solution Deposition
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High-efficiency solution-processed OLED based on trivalent europium complex by modifying the composition of the

Xiaofang Li1,2, Jiaxuan Yin1,2, Jingyu Wang1,2

  • 1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China.

Frontiers in Chemistry
|October 3, 2022
PubMed
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This study optimized a multiple-host system for solution-processed organic light-emitting diodes (s-OLEDs) using europium complexes. Removing TmPyPB reduced turn-on voltage, while TcTa improved hole transfer, leading to high-efficiency red s-OLEDs.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photochemistry

Background:

  • Solution-processed organic light-emitting diodes (s-OLEDs) offer a cost-effective alternative to vacuum-deposited devices.
  • Europium complexes are promising red emitters, but their efficiency in s-OLEDs requires careful host material design.

Purpose of the Study:

  • To optimize a multiple-host system for solution-processed organic light-emitting diodes (s-OLEDs) utilizing a europium complex emitter.
  • To investigate the impact of different host materials on device performance, including turn-on voltage and charge transport.

Main Methods:

  • Fabrication of s-OLED devices with varying compositions of the multiple-host system: di-[4-(N,N-ditolylamino)-phenyl]cyclohexane (TAPC), 4,4',4″-tri (9-carbazoyl)triphenylamine (TcTa), 9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole (CzSi), and 1,3,5-tri (m-pyrid-3-yl-phenyl)benzene (TmPyPB).
Keywords:
host materialsmultiple-host systemorganic light-emitting diodesrecombination zonesolution-processed method

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  • Evaluation of device performance metrics such as turn-on voltage, current efficiency, power efficiency, external quantum efficiency, and brightness.
  • Analysis of charge transfer mechanisms within the multiple-host system.

    • Main Results:

    • Removing TmPyPB from the host system significantly reduced the turn-on voltage.
    • Incorporating TcTa enhanced hole transfer from TAPC to the europium complex, increasing carrier recombination probability.
    • The optimized s-OLED achieved a low turn-on voltage of 3.8 V, with maximum efficiencies of 2.07 cd/A (current), 1.54 lm/W (power), and 1.2% (external quantum efficiency), and a peak brightness of 945 cd/m².

    Conclusions:

    • The composition of the multiple-host system is critical for achieving high-performance s-OLEDs.
    • Strategic selection and combination of host materials can effectively tune charge transport properties and improve device efficiency.
    • This work demonstrates a viable approach for fabricating efficient, solution-processed red OLEDs using europium complexes.