Stabilizing Perovskite Light-Emitting Diodes by Alternating Current

Qingxun Guo, Shunzhang Yu, Yiming Liu, Yajing Li, Lingfeng Chao, Guiqiu Zhao, You Liu, Na Meng, Gang Lu, Dezhi Yang, Huanxin Ju, Mingjie Li, Guichuan Xing, Dongge Ma, Yingdong Xia, Yonghua Chen

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摘要

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 (T50) compared to the DC-driving mode. This enhancement is particularly pronounced in mixed-halide PeLEDs (e.g., FAPbI2Br), where the challenging issue of spectral drift due to ion migration has been effectively resolved.

源语言英语
期刊Laser and Photonics Reviews
DOI
出版状态已接受/待刊 - 2025

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