Perovskite Light-Emitting Diodes and Device Performance

Perovskite light-emitting diodes (PeLEDs) harness the remarkable optoelectronic properties of metal halide perovskites to deliver high brightness, narrow emission spectra and facile colour tunability. These devices typically comprise a layered architecture in which a perovskite emissive layer is sandwiched between charge‐transport and electrode layers. Key performance metrics include external quantum efficiency (EQE), operational stability (lifetime under continuous operation), luminance and efficiency roll-off at high current densities. Recent advances in crystal engineering, defect passivation and light-out-coupling strategies have propelled PeLEDs towards EQEs exceeding 25% and operational lifetimes measured in hundreds of hours. Challenges remain in mitigating ion migration, suppressing non-radiative recombination and extracting trapped photons. Ongoing research is uniting material innovation with device engineering to pave the way for perovskite-based displays, solid-state lighting and near-infrared emitters with unprecedented performance and manufacturability.

Research from Nature Portfolio

Recent studies have achieved microsecond-response PeLEDs by employing an individual-particle passivation strategy. By introducing tetrafluoroborate ions during film deposition, each perovskite nanocrystal becomes defect‐free and crystallographically discrete, greatly inhibiting ion migration. The resulting devices exhibit response times under 10 µs, external quantum efficiencies above 20% across red, green and blue colours, and compatibility with active-matrix displays at 30 pixels per inch. These findings demonstrate that rapid electroluminescence rise times, once a barrier to high-refresh-rate displays, can be overcome through nanoscale passivation. Another line of investigation uses self-supervised deep learning to monitor PeLED degradation in situ. By combining multispectral imaging with blind-denoising algorithms, researchers have visualised lateral ion migration and chloride-rich trap formation in mixed-halide films, revealing spatially resolved degradation pathways that conventional techniques could not resolve. This approach provides a powerful tool for correlating device architecture with long-term stability under operational conditions.

Perovskite Light-Emitting Diodes and Device Performance publication trend

The graph below shows the total number of articles in perovskite light-emitting diodes and device performance across all publications each year (not limited to Nature Index journals).

Technical terms

External quantum efficiency (EQE): The ratio of emitted photons collected to injected electrons, expressing overall device efficiency.

Ion migration: Movement of ionic species within the perovskite lattice under an electric field, often leading to device instability.

Defect passivation: Chemical or physical treatment that neutralises trap states at grain boundaries or surfaces to reduce non-radiative recombination.

Light-out-coupling: Techniques to extract photons trapped by total internal reflection, improving the fraction of light emitted externally.

Active-matrix display: A pixel addressing scheme in which each pixel is individually driven, requiring fast response times and high stability.

References

1. Microsecond-response perovskite light-emitting diodes for active-matrix displays. Nature Electronics (2024).
2. Self-supervised deep learning for tracking degradation of perovskite light-emitting diodes with multispectral imaging. Nature Machine Intelligence (2023).
3. Self-Generated Buried Submicrocavities for High-Performance Near-Infrared Perovskite Light-Emitting Diode. Nano-Micro Letters (2023).
4. Ultrathin Light-Emitting Diodes with External Efficiency over 26% Based on Resurfaced Perovskite Nanocrystals. ACS Energy Letters (2023).