Efficient green light-emitting diodes based on quasi-two-dimensional composition and phase engineered perovskite with surface passivation

Xiaolei Yang, Xingwang Zhang, Jinxiang Deng, Zema Chu, Qi Jiang, Junhua Meng, Pengyang Wang, Liuqi Zhang, Zhigang Yin and Jingbi You ()
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Xiaolei Yang: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences
Xingwang Zhang: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences
Jinxiang Deng: Beijing University of Technology
Zema Chu: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences
Qi Jiang: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences
Junhua Meng: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences
Pengyang Wang: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences
Liuqi Zhang: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences
Zhigang Yin: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences
Jingbi You: Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Perovskite light-emitting diodes (LEDs) are attracting great attention due to their efficient and narrow emission. Quasi-two-dimensional perovskites with Ruddlesden–Popper-type layered structures can enlarge exciton binding energy and confine charge carriers and are considered good candidate materials for efficient LEDs. However, these materials usually contain a mixture of phases and the phase impurity could cause low emission efficiency. In addition, converting three-dimensional into quasi-two-dimensional perovskite introduces more defects on the surface or at the grain boundaries due to the reduction of crystal sizes. Both factors limit the emission efficiency of LEDs. Here, firstly, through composition and phase engineering, optimal quasi-two-dimensional perovskites are selected. Secondly, surface passivation is carried out by coating organic small molecule trioctylphosphine oxide on the perovskite thin film surface. Accordingly, green LEDs based on quasi-two-dimensional perovskite reach a current efficiency of 62.4 cd A−1 and external quantum efficiency of 14.36%.

Date: 2018
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DOI: 10.1038/s41467-018-02978-7

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