Charge balance engineering towards stable perovskite LEDs: electron transport matters

Shiyu Xing; Yucai Yuan; Shiang Zhang; Baodan Zhao; Dawei Di

doi:10.1117/12.3046556

27 September 2024 Charge balance engineering towards stable perovskite LEDs: electron transport matters

Shiyu Xing, Yucai Yuan, Shiang Zhang, Baodan Zhao, Dawei Di

Proceedings Volume 13261, Tenth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024); 132613S (2024) https://doi.org/10.1117/12.3046556
Event: 10th International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024), 2024, Wuhan, China

Abstract

For perovskite light-emitting diodes (PeLEDs), the instability of devices is one of the major obstacles toward commercial applications. Recently, high operational stability comparable to that of OLEDs has been demonstrated in near-infrared (NIR) PeLEDs. However, the stability of visible PeLEDs remains unsatisfactory and the mechanisms of degradation are not yet fully understood. Here, we systematically study the performance of PeLEDs based on different electron-transport layers (ETLs) and find that the deterioration of electron transport contributes to the degradation of PeLEDs. Further, time-of-flight secondary ion mass spectrometry results reveal the impaired electron injection layer during continuous operation. With PO-T2T as the ETL and CsF as the EIL (PO-T2T/CsF), we demonstrate a more balanced and robust electron transport. The resultant PeLED exhibits a maximum EQE of 17.5%, a high luminance of 3.6×10⁵ cd m^-2, and a decent stability (T₅₀) of ~70 h at an initial luminance (L₀) of 1000 cd m^-2, significantly improved compared to that based on the commonly used TPBi/LiF structure.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Shiyu Xing, Yucai Yuan, Shiang Zhang, Baodan Zhao, and Dawei Di "Charge balance engineering towards stable perovskite LEDs: electron transport matters", Proc. SPIE 13261, Tenth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024), 132613S (27 September 2024); https://doi.org/10.1117/12.3046556

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KEYWORDS

Perovskite

External quantum efficiency

Electron transport

Light emitting diodes

Electroluminescence

Lithium

Ions

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