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Suppressing electron–phonon coupling for narrow-band emitting Eu(II)-based perovskitoids

Author

Listed:
  • Kai Han

    (South China University of Technology)

  • Xuesong Wang

    (Anhui Normal University)

  • Jiance Jin

    (South China University of Technology)

  • Shuai Zhang

    (South China University of Technology)

  • Liang Li

    (South China University of Technology)

  • Yuzhen Wang

    (South China University of Technology)

  • Lixin Ning

    (Anhui Normal University)

  • Zhiguo Xia

    (South China University of Technology
    South China University of Technology)

Abstract

Narrow-band emitters are essential for solid-state lighting, displays, and single-photon sources. Here we design a family of lead-free Eu(II)-based hybrid perovskitoids with tightly face-shared connected [EuBr6]4– octahedrons, and the experimental and theoretical analyses verify that the electron-phonon coupling therein is suppressed via symmetrical structural parameters as confirmed by the low Huang–Rhys factor, and thus diminishes the homogeneous broadening of the emission bandwidths. Thus, TEtEuBr3 (TEt is Tetraethylammoniumwith) with symmetrical octahedrons shows ultra-narrow-band cyan emission (full width at half maximum ~36 nm) characterized by localized 5d-4f transition of Eu(II). The as-fabricated phosphor-converted light-emitting-diodes demonstrate low blue light hazard index and high color-rendering index of 96% in full-spectrum lighting technologies, moreover, they realize ultrahigh color gamut of ~115% Rec. 2020 as four-color display devices. We expect this strategy can be expanded to other narrow-band emitters for state-of-the-art optoelectronic applications.

Suggested Citation

  • Kai Han & Xuesong Wang & Jiance Jin & Shuai Zhang & Liang Li & Yuzhen Wang & Lixin Ning & Zhiguo Xia, 2025. "Suppressing electron–phonon coupling for narrow-band emitting Eu(II)-based perovskitoids," Nature Communications, Nature, vol. 16(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-60852-9
    DOI: 10.1038/s41467-025-60852-9
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    2. P. M. Pattison & J. Y. Tsao & G. C. Brainard & B. Bugbee, 2018. "LEDs for photons, physiology and food," Nature, Nature, vol. 563(7732), pages 493-500, November.
    3. Cheng Liu & Yi Yang & Hao Chen & Ioannis Spanopoulos & Abdulaziz S. R. Bati & Isaiah W. Gilley & Jianhua Chen & Aidan Maxwell & Badri Vishal & Robert P. Reynolds & Taylor E. Wiggins & Zaiwei Wang & Ch, 2024. "Two-dimensional perovskitoids enhance stability in perovskite solar cells," Nature, Nature, vol. 633(8029), pages 359-364, September.
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