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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Face-to-face integrated tandem quantum-dot LEDs with high performance and multifunctionality.

Haotao Li¹, Jiming Wang¹, Shuming Chen²

¹Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.

Light, Science & Applications

|April 25, 2025

Summary

This study presents a novel solution-processed tandem quantum-dot LED (QLED) overcoming fabrication challenges. The developed device achieves record efficiency, high brightness, and full color tunability for advanced lighting applications.

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Solution-processed tandem quantum-dot LEDs (QLEDs) face challenges with inefficient interconnects and solution-induced damage.
Achieving multifunctionality in tandem QLEDs requires overcoming these limitations.

Purpose of the Study:

To develop a high-performance, solution-processed tandem QLED with enhanced multifunctionality.
To demonstrate independent addressing of top and bottom QLED units for versatile operation modes.

Main Methods:

Face-to-face integration of a top-emitting QLED with a transparent QLED.
Fabrication of tandem QLEDs enabling independent control of individual units.

Main Results:

Achieved ultra-low turn-on voltage (3.3 V) and record external quantum efficiency (60.7%) in series mode.
Demonstrated high brightness (>4.8 × 10^6 cd/m^2) in parallel mode.
Enabled full color tunability (114% NTSC) and significantly improved stability (30,000 h T95 lifetime).

Conclusions:

The developed face-to-face integration method provides a feasible route to multifunctional tandem QLEDs.
This approach offers advantages in solution processing, efficiency, brightness, stability, and color tunability for diverse light source applications.