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Highly bright and stable single-crystal perovskite light-emitting diodes

Nature Photonics volume 17, pages 401–407 (2023)Cite this article

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Abstract

Metal-halide perovskite light-emitting diodes (PeLEDs) have attracted great interest because of their tunable emission wavelength, narrow emission bandwidth and high external quantum efficiency. However, PeLEDs face two critical issues that limit their potential applications: short device lifetime due to ion migration and low brightness due to severe Auger recombination. Here we demonstrate that both issues can be mitigated by in situ solution-grown perovskite single crystals (SCs). By minimizing the trap density using mixed cations and adding excess ammonium halides and polyvidone to the precursor, the external photoluminescence quantum yield (PLQY) of the SCs is enhanced to 28.3%, corresponding to an internal PLQY of 89.4%. Benefitting from the suppressed Auger recombination in SCs, SC-PeLEDs with a thickness of 1.5 µm exhibit a high luminance of 86,000 cd m−2 and a peak external quantum efficiency of 11.2%. Thanks to suppressed ion migration, the extrapolated T50 lifetime for SC-PeLEDs reaches a value of 12,500 h at an initial luminance of 100 cd m−2. Our results show that SC growth represents a viable route to increase the lifetime of PeLEDs for practical applications.

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Fig. 1: Growth and optimization of perovskite SCs.
Fig. 2: Device structure and performance of the SC-PeLEDs.
Fig. 3: Carrier recombination dynamics in SCs and PC films.
Fig. 4: Operational stability of SC-PeLEDs and PC-PeLEDs.

Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request. Source data are provided with this paper.

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Acknowledgements

Z.X. acknowledges support from the National Natural Science Foundation of China (51872274 and 62175226) and the Fundamental Research Funds for the Central Universities (WK2060190100). This work was partially carried out at the University of Science and Technology of China Center for Micro and Nanoscale Research and Fabrication.

Author information

Author notes

  1. These authors contributed equally: Wenjing Chen, Zongming Huang, Haitao Yao.

Authors and Affiliations

  1. Department of Physics, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui, China

    Wenjing Chen, Zongming Huang, Haitao Yao, Yan Liu, Yihan Zhang, Zhijian Li & Zhengguo Xiao

  2. Instruments Center for Physical Science, University of Science and Technology of China, Hefei, Anhui, China

    Hongmin Zhou

  3. Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, Anhui, China

    Peng Xiao & Tao Chen

  4. School of Microelectronics, University of Science and Technology of China, Hefei, Anhui, China

    Haiding Sun

  5. Department of Applied Physical Sciences, University of North Carolina, Chapel Hill, NC, USA

    Jinsong Huang

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Contributions

Z.X. conceived the idea and supervised the project. W.C., Y.L. and H.Y. fabricated and characterized the perovskite SCs and PeLEDs. Z.H. carried out the optical simulation of the PeLEDs and performed the PLQY and TRPL measurements. Y.Z. and Z.L. helped with the fluorescence microscopy characterizations. H.Z. helped with the SEM and EDS mapping characterizations. P.X. and T.C. performed the transient absorption characterizations. Z.X., W.C. and Z.H. wrote the manuscript, and all authors discussed the results and reviewed the manuscript.

Corresponding author

Correspondence to Zhengguo Xiao.

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Chen, W., Huang, Z., Yao, H. et al. Highly bright and stable single-crystal perovskite light-emitting diodes. Nat. Photon. 17, 401–407 (2023). https://doi.org/10.1038/s41566-023-01167-3

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