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Stable α-CsPbI3 with extremely red emission for expanding the color gamut

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Abstract

The wider color gamut represents the better reproducibility of the real natural colors. Perovskite materials exhibit promising potential in full-color wide-gamut displays because of the wide tunability and high saturability of their photon emission. However, the full-color wide gamut (>100% Rec.2020) has not been constructed due to the lack of the extreme red primary color (∼700 nm). Herein, the widest color gamut is realized, wherein α-CsPbI3 is used to generate the extreme red primary color. An in-situ encapsulation approach is advised to stabilize α-CsPbI3 at room temperature by means of polyvinylpyrrolidone (PVP). The α-CsPbI3 encapsulated by PVP (denoted as P-CPI) shows highly saturated (FWHM (full width at half maximum) ∼28 nm) and extremely (∼697 nm) red emission. The green emission is provided by P-CPBr (CsPbBr3 with PVP) which is also synthesized using the universal in-situ encapsulation approach. With the assistance of a commercial GaN chip, the RGB gamut is extended to the widest (151% NTSC, 113% Rec.2020).

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Acknowledgements

This work was supported by National Key Research and Development Program of China (Grant Nos. 2019YFA0308000, 2017YFA0205700) and National Natural Science Foundation of China (Grant Nos. 91963130, 61927808).

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Authors and Affiliations

  1. School of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing, 211189, China

    Yong Zhang, Xin Wei, Lei Gao, Weijie Zhao, Zhenhua Ni & Junpeng Lu

  2. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, China

    Changjiu Sun, Junli Wei & Mingjian Yuan

  3. Jiangsu Key Lab on Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing, 210023, China

    Hongwei Liu

Authors
  1. Yong Zhang
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  2. Xin Wei
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  10. Hongwei Liu
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Corresponding authors

Correspondence to Zhenhua Ni, Junpeng Lu or Hongwei Liu.

Additional information

Supporting information Appendixes A and B. The supporting information is available online at info.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Zhang, Y., Wei, X., Gao, L. et al. Stable α-CsPbI3 with extremely red emission for expanding the color gamut. Sci. China Inf. Sci. 67, 152405 (2024). https://doi.org/10.1007/s11432-023-3944-3

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  • DOI: https://doi.org/10.1007/s11432-023-3944-3

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