https://scholars.lib.ntu.edu.tw/handle/123456789/634118
標題: | Realizing High Brightness Quasi-2D Perovskite Light-Emitting Diodes with Reduced Efficiency Roll-Off via Multifunctional Interface Engineering | 作者: | Lin, Yu Kuan Chen, Chiung Han Wang, Yen Yu Yu, Ming Hsuan Yang, Jing Wei Ni, I. Chih Lin, Bi Hsuan Zhidkov, Ivan S. Kurmaev, Ernst Z. Lu, Yu Jung CHU-CHEN CHUEH |
關鍵字: | efficiency roll-off | hole blocking | interface engineering | Light-emitting diodes | quasi-2D perovskites | 公開日期: | 1-一月-2023 | 來源出版物: | Advanced Science | 摘要: | Quasi-2D perovskites have recently flourished in the field of luminescence due to the quantum-confinement effect and the efficient energy transfer between different n phases resulting in exceptional optical properties. However, owing to the lower conductivity and poor charge injection, quasi-2D perovskite light-emitting diodes (PeLEDs) typically suffer from low brightness and high-efficiency roll-off at high current densities compared to 3D perovskite-based PeLEDs, which is undoubtedly one of the most critical issues in this field. In this work, quasi-2D PeLEDs with high brightness, reduced trap density, and low-efficiency roll-off are successfully demonstrated by introducing a thin layer of conductive phosphine oxide at the perovskite/electron transport layer interface. The results surprisingly show that this additional layer does not improve the energy transfer between multiple quasi-2D phases in the perovskite film, but purely improves the electronic properties of the perovskite interface. On the one hand, it passivates the surface defects of the perovskite film; on the other hand, it promotes electron injection and prevents hole leakage across this interface. As a result, the modified quasi-2D pure Cs-based device shows a maximum brightness of > 70,000 cd m−2 (twice that of the control device), a maximum external quantum efficiency (EQE) of > 10% and a much lower efficiency roll-off at high bias voltages. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/634118 | ISSN: | 2198-3844 | DOI: | 10.1002/advs.202302232 |
顯示於: | 化學工程學系 |
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