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Electrochemically engineered NiOx for high-performance quantum dot light-emitting diodes.

Ting Ding1, Zhi-Sheng Wu1, Jing Jiang1

  • 1Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR 999078, China.

Journal of Colloid and Interface Science
|September 25, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel electrochemical engineering method to precisely control nickel oxide (NiOx) work function. This strategy significantly improves quantum dot light-emitting diodes (QLEDs) efficiency and operational stability.

Keywords:
Electrochemical engineeringHole injectionNickel oxideQLED

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Electrochemistry

Background:

  • Solution-processed nickel oxide (NiOx) is a promising low-cost alternative for hole injection layers (HILs) in quantum dot light-emitting diodes (QLEDs).
  • Achieving precise energy level modulation of NiOx for optimal alignment with organic hole transport layers (HTLs) is a significant challenge.
  • This alignment is crucial for enhancing QLED performance and operational stability.

Purpose of the Study:

  • To demonstrate a post-electrochemical engineering strategy for precise control of NiOx work function.
  • To enhance hole injection capabilities by reducing the energy barrier at the HIL/HTL interface.
  • To improve charge transport kinetics and suppress non-radiative energy loss in QLEDs.

Main Methods:

  • A post-electrochemical engineering strategy was employed to modify the work function of solution-processed NiOx films.
  • This method facilitates precise control over the energy levels of the NiOx HIL.
  • The engineered NiOx layers were integrated into QLED devices.

Main Results:

  • The electrochemical engineering strategy successfully lowered the energy barrier at the HIL/HTL interface.
  • This resulted in enhanced hole injection and suppressed charge accumulation and non-radiative energy loss.
  • QLEDs utilizing the engineered NiOx exhibited an ~80% improvement in current efficiency and a 4-fold increase in operational lifetime.

Conclusions:

  • Electrochemical engineering offers a precise method for tailoring NiOx HIL properties.
  • This approach significantly advances QLED efficiency and stability through optimized charge functional layers.
  • The findings pave the way for more robust and efficient solution-processed QLEDs.