Stabilizing Perovskite Light‐Emitting Diodes by Alternating Current

Abstract Ion migration is inevitable for perovskite light‐emitting diodes (PeLEDs) operating under a constant direct current (DC) electric field, significantly undermining device stability. Herein, a straightforward and effective strategy is presented for boosting the lifetime of PeLEDs by employing an alternating current (AC)‐driving mode. The impact of driving mode on device performance is investigated, achieving a record external quantum efficiency (EQE) of 14.9% under AC‐driving mode with negligible efficiency roll‐off (EQE >13.5%) across a wide range of current densities (1 to 400 mA cm −2 ). Notably, the effectively suppressed ion migration is demonstrated in AC‐driving mode, resulting in a remarkable 40‐fold increase in operational lifetime ( T 50 ) compared to the DC‐driving mode. This enhancement is particularly pronounced in mixed‐halide PeLEDs (e.g., FAPbI 2 Br), where the challenging issue of spectral drift due to ion migration has been effectively resolved.

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Publication Details

Journal
Laser & Photonics Review
Published
2025-04-19
DOI
https://doi.org/10.1002/lpor.202402262
Citations
1
Primary Topic
Perovskite Materials and Applications
Type
article
Field-Weighted Citation Impact
0.73

Funders

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Stabilizing Perovskite Light‐Emitting Diodes by Alternating Current

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Stabilizing Perovskite Light‐Emitting Diodes by Alternating Current

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article en
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Abstract

Abstract Ion migration is inevitable for perovskite light‐emitting diodes (PeLEDs) operating under a constant direct current (DC) electric field, significantly undermining device stability. Herein, a straightforward and effective strategy is presented for boosting the lifetime of PeLEDs by employing an alternating current (AC)‐driving mode. The impact of driving mode on device performance is investigated, achieving a record external quantum efficiency (EQE) of 14.9% under AC‐driving mode with negligible efficiency roll‐off (EQE >13.5%) across a wide range of current densities (1 to 400 mA cm −2 ). Notably, the effectively suppressed ion migration is demonstrated in AC‐driving mode, resulting in a remarkable 40‐fold increase in operational lifetime ( T 50 ) compared to the DC‐driving mode. This enhancement is particularly pronounced in mixed‐halide PeLEDs (e.g., FAPbI 2 Br), where the challenging issue of spectral drift due to ion migration has been effectively resolved.

Laser & Photonics ReviewVol. 19(15)
University of Science and Technology of China (CN), Nanjing Tech University (CN), Hong Kong Polytechnic University (HK), Shenzhen Polytechnic University (CN), University of Macau (MO), National Synchrotron Radiation Laboratory (CN), South China University of Technology (CN)
National Natural Science Foundation of China, National Key Research and Development Program of China
Openalex Percentile: Top 29%
Perovskite Materials and Applications
0.73
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