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Researchers developed high-performance alternating current (AC)-driven quantum-dot light-emitting diodes (QLEDs) using a novel bipolar design. These AC-QLEDs can be directly powered by household electricity, offering stable and bright solid-state lighting solutions.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • Alternating current (AC)-driven quantum-dot light-emitting diodes (QLEDs) offer advantages in stability and direct integration with household electricity compared to direct current (DC) devices.
  • Achieving high performance in AC-driven QLEDs remains a significant challenge for practical applications.

Purpose of the Study:

  • To develop high-performance AC-driven QLEDs capable of direct integration with household AC power.
  • To explore novel device architectures for efficient AC-QLED operation.

Main Methods:

  • Fabrication of a bipolar QLED by connecting a regular and an inverted QLED in series using a coplanar electrode design with an aluminum (Al) bridging layer.
  • Investigated device performance by replacing Al with silver (Ag) to reduce electron transport layer resistance.
  • Explored vertical stacking of regular and inverted QLEDs with a metallic intermediate layer.
  • Demonstrated series connection of multiple bipolar QLEDs for direct drive by a 220 V/50 Hz household power supply.

Main Results:

  • Achieved a bipolar QLED with a high external quantum efficiency (EQE) of 22.9%.
  • Replacing Al with Ag enhanced brightness to 16370 cd m⁻² at 15 V due to reduced resistance.
  • Successfully demonstrated AC-QLEDs driven directly by household AC power without external electronics.

Conclusions:

  • The developed bipolar QLEDs, in both coplanar and vertical configurations, represent a significant advancement in AC-driven QLED technology.
  • These devices show great potential for plug-and-play solid-state lighting and advanced display applications utilizing household AC electricity.