Quantum Dot Light-Emitting Diode Technologies

Semiconductor quantum dots (QDs) have emerged as a transformative class of emitters in light-emitting diodes (LEDs) through their size-tuneable emission, high colour purity and solution-processability. In a typical quantum dot LED (QLED), a thin film of colloidal QDs is sandwiched between electron- and hole-transport layers where charge injection and recombination occur within the QD emissive layer. Advances in QD synthesis and surface engineering have progressively suppressed non-radiative pathways, elevating photoluminescence quantum yields to near unity. Concurrent optimisation of core/shell architectures, ligand passivation and energy-level alignment has led to external quantum efficiencies exceeding 25 per cent and extended operational lifetimes. Challenges remain in achieving stable blue emission, controlling interfacial exciton quenching and ensuring device longevity under continuous operation. Integration of QLEDs into flexible and wearable platforms further demands mechanical robustness and high-definition patterning. Recent research has yielded hybrid tandem devices, novel ligand chemistries and refined charge-balance strategies that collectively point towards commercially viable, full-colour QLED displays and solid-state lighting applications.

Research from Nature Portfolio

Recent studies have tackled the chief limitations of blue QLEDs by engineering the QD core and shell to reduce detrimental surface-bulk coupling. A large-core, non-monotonically graded shell design has been shown to diminish dipolar excited states, enhancing operational lifetimes of blue devices to over 200 hours at display-relevant luminance. In parallel, novel electrochemically inert surface ligands have been introduced to bridge the gap between photoluminescence and electroluminescence, suppressing ligand oxidation and surface-quenching processes. These ligand strategies have delivered record-long operational lifetimes of several thousand hours for both red and blue QLEDs. Fundamental investigations into exciton-generation mechanisms have employed single-nanocrystal spectroscopy to reveal a sequential electron-hole injection pathway mediated by charge-confinement effects, providing a universal framework for optimising charge balance and radiative recombination in colloidal nanocrystal devices.

Quantum Dot Light-Emitting Diode Technologies publication trend

The graph below shows the total number of articles in quantum dot light-emitting diode technologies across all publications each year (not limited to Nature Index journals).

Technical terms

Quantum dot: Nanoscale semiconductor crystal whose electronic energy levels and emission wavelength are dictated by its size.

Electroluminescence: Light emission induced by the recombination of electrically injected charge carriers.

External quantum efficiency (EQE): The ratio of emitted photons to injected charge carriers in a light-emitting device.

Core/shell structure: A layered nanocrystal architecture in which a core semiconductor is encapsulated by one or more shell materials to enhance optical and electronic properties.

Exciton: A bound electron–hole pair formed within a semiconductor upon electrical or optical excitation.

References

1. Realizing low voltage-driven bright and stable quantum dot light-emitting diodes through energy landscape flattening. Light: Science & Applications (2025).
2. Blue light-emitting diodes based on colloidal quantum dots with reduced surface-bulk coupling. Nature Communications (2023).
3. Wearable red–green–blue quantum dot light-emitting diode array using high-resolution intaglio transfer printing. Nature Communications (2015).
4. Electrochemically-stable ligands bridge the photoluminescence-electroluminescence gap of quantum dots. Nature Communications (2020).
5. High‐Resolution Inkjet Printing of Quantum Dot Light‐Emitting Microdiode Arrays. Advanced Optical Materials (2019).
6. Quantum-dot and organic hybrid tandem light-emitting diodes with multi-functionality of full-color-tunability and white-light-emission. Nature Communications (2020).
7. Deciphering exciton-generation processes in quantum-dot electroluminescence. Nature Communications (2020).