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Solution processible MoOx-incorporated graphene anode for efficient polymer light-emitting diodes.

Dongchan Lee1, Donghyuk Kim1, Yonghee Lee1

  • 1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-338, Republic of Korea.

Nanotechnology
|April 25, 2017
PubMed
Summary

Molybdenum oxide nanoparticle doping significantly enhances graphene anodes for polymer light-emitting diodes (PLEDs), improving conductivity and efficiency. This breakthrough addresses key limitations, paving the way for advanced flexible electronic devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Organic Electronics

Background:

  • Graphene exhibits excellent properties for organic or polymer light-emitting diodes (OLEDs/PLEDs) but faces limitations like high sheet resistance and work function mismatch.
  • Indium tin oxide (ITO) is the current standard anode material, but its brittleness on plastic substrates is a concern.

Purpose of the Study:

  • To investigate the use of molybdenum oxide (MoO x) nanoparticle-doped graphene as an improved anode for PLEDs on plastic substrates.
  • To analyze the influence of MoO x doping concentration on graphene's electronic properties and PLED performance.
  • To present a modified graphene electrode structure for enhanced device performance.

Main Methods:

  • A facile and scalable spin coating process was employed to dope few-layer graphene with MoO x nanoparticles.

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  • Characterization of doped graphene included measurements of sheet resistance, optical transmittance, and surface roughness.
  • Fabrication and testing of PLED devices utilizing MoO x-doped graphene anodes with varying doping levels.

    • Main Results:

    • MoO x doping reduced the sheet resistance of five-layer graphene to ~180 Ω sq -1 while maintaining ~88% optical transmittance.
    • The surface of MoO x-doped graphene was observed to be smoother than pristine graphene.
    • PLEDs with MoO x-doped graphene anodes achieved maximum external quantum efficiency (EQE) of 4.7% and power efficiency of 13.3 lm W -1, representing significant improvements over pristine graphene anodes (261% for EQE, 255% for power efficiency).

    Conclusions:

    • Molybdenum oxide nanoparticle doping effectively enhances the performance of graphene anodes for PLEDs by improving electrical and surface properties.
    • The doping concentration exhibits a nonlinear relationship with device performance, necessitating optimization.
    • The developed MoO x-doped graphene anode offers a promising alternative to ITO for flexible PLED applications.