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Blue light-emitting diodes based on quasi-two-dimensional perovskite with efficient charge injection and optimized phase distribution via an alkali metal salt

Nature Electronics volume 6, pages 360–369 (2023)Cite this article

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Abstract

Perovskite light-emitting diodes are of potential use in the development of colour displays and solid-state lighting. This requires high-performance blue perovskite emission. However, quasi-two-dimensional blue perovskite light-emitting diodes exhibit lower performance than green- and red-emitting devices due to poor charge injection between the hole injection layers and perovskite film, high amounts of non-radiative recombination and random phase distribution. Here we show that the addition of an alkali metal salt (caesium chloride) to a hole injection layer (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) can improve carrier transport in the injection layer and create better band alignment for increased charge injection efficiency. The growth of perovskite layers on the caesium-chloride-incorporated substrates also causes a rearrangement of their phase distribution, which leads to lower non-radiative recombinations and enhanced charge transport. With this approach, we create sky-blue quasi-two-dimensional perovskite light-emitting diodes with an emission peak located at 486 nm, a peak external quantum efficiency of 16.07% and encouraging operational stability.

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Fig. 1: Effect of CsCl on properties of PEDOT:PSS films.
Fig. 2: Characteristics of perovskite films deposited on PEDOT:PSS substrates without and with CsCl.
Fig. 3: Effects of CsCl on the phase distribution of quasi-2D perovskites.
Fig. 4: Charge-carrier transfer process in quasi-2D perovskites.
Fig. 5: Performance of PeLEDs.

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The data that support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (grant nos. 61925405 and 61634001), Beijing Natural Science Foundation (Z220007), Strategic Priority Research Program of the Chinese Academy of Sciences (XDB43000000) and Collaborative Innovation Center of Suzhou Nano Science and Technology.

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Authors and Affiliations

  1. Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, People’s Republic of China

    Zema Chu, Wei Zhang, Ji Jiang, Zihan Qu, Fei Ma, Yang Zhao, Xinbo Chu, Zhigang Yin, Xingwang Zhang & Jingbi You

  2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, People’s Republic of China

    Zema Chu, Ji Jiang, Zihan Qu, Fei Ma, Yang Zhao, Xinbo Chu, Zhigang Yin, Xingwang Zhang & Jingbi You

  3. School of Science, China University of Geosciences, Beijing, People’s Republic of China

    Wei Zhang

  4. Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-Optoelectronics Materials and Devices, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, People’s Republic of China

    Yunxiu Shen & Yaowen Li

  5. Joint Lab of Digital Optical Chip, Wuyi University, Jiangmen, People’s Republic of China

    Xingwang Zhang

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Contributions

Z.C. and J.Y. conceived the idea and designed the experiments. J.Y. directed and supervised the project. Z.C. carried out the device fabrication and characterizations. W.Z., J.J., Z.Q., F.M., Y.Z., X.C., Y.S., Y.L., Z.Y. and X.Z. were involved in the data analysis. Z.C. and J.Y. co-wrote the paper. All the authors contributed to discussions and finalizing the paper.

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Correspondence to Jingbi You.

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Chu, Z., Zhang, W., Jiang, J. et al. Blue light-emitting diodes based on quasi-two-dimensional perovskite with efficient charge injection and optimized phase distribution via an alkali metal salt. Nat Electron 6, 360–369 (2023). https://doi.org/10.1038/s41928-023-00955-7

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