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Solution-processable organic light-emitting diodes utilizing electroluminescent perylene tetraester-based columnar

Shallu Dhingra1, Iram Siddiqui2, Santosh Prasad Gupta3

  • 1Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector-81, SAS Nagar, Knowledge City, Manauli, 140306, India. skpal@iisermohali.ac.in.

Soft Matter
|November 14, 2022
PubMed
Summary

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We synthesized novel liquid crystals with perylene tetraester cores and trialkoxyphenyl units. These materials exhibit stable columnar mesophases and electroluminescent properties, leading to efficient organic light-emitting diodes (OLEDs).

Area of Science:

  • Materials Science
  • Organic Chemistry
  • Condensed Matter Physics

Background:

  • Liquid crystals (LCs) are crucial for display technologies.
  • Perylene derivatives are known for their photophysical properties.
  • Developing new electroluminescent materials is key for advanced organic light-emitting diodes (OLEDs).

Purpose of the Study:

  • To synthesize and characterize a new series of liquid crystals based on perylene tetraesters.
  • To investigate the liquid crystalline and electroluminescent properties of these novel compounds.
  • To fabricate and optimize solution-processable OLED devices using these materials as emitters.

Main Methods:

  • Differential scanning calorimetry (DSC) and polarized optical microscopy (POM) for thermal and mesophase analysis.

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  • Small- and wide-angle X-ray scattering (SAXS/WAXS) for structural characterization.
  • Fabrication of OLED devices with a specific multilayer structure and evaluation of their electroluminescent performance.

    • Main Results:

    • A homologous series of liquid crystals (compounds 1a-c) with stable enantiotropic columnar mesophases was successfully synthesized.
    • The compounds exhibited favorable photophysical and thermal properties suitable for electroluminescence.
    • The best performing OLED device, using compound 1c as an emitter doped in a 4,4',4''-Tris[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA) host, achieved a maximum power efficacy of 17.2 lm W⁻¹, current efficacy of 18.5 cd A⁻¹, and external quantum efficiency of 6.3%.

    Conclusions:

    • The synthesized perylene tetraester-based liquid crystals are promising materials for electroluminescent applications.
    • The choice of host material significantly impacts OLED performance, with m-MTDATA outperforming CBP.
    • Solution-processable OLEDs incorporating these novel liquid crystals demonstrate potential for efficient light emission.