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Efficient deep-blue electroluminescence from Ce-based metal halide

Author

Listed:
  • Longbo Yang

    (Huazhong University of Science and Technology (HUST))

  • Hainan Du

    (Huazhong University of Science and Technology (HUST))

  • Jinghui Li

    (Huazhong University of Science and Technology (HUST))

  • Yiqi Luo

    (Huazhong University of Science and Technology (HUST))

  • Xia Lin

    (Huazhong University of Science and Technology (HUST))

  • Jincong Pang

    (Huazhong University of Science and Technology (HUST))

  • Yuxuan Liu

    (Huazhong University of Science and Technology (HUST)
    Hubei Jiufengshan Laboratory)

  • Liang Gao

    (Huazhong University of Science and Technology (HUST))

  • Siwei He

    (Jeonbuk National University)

  • Jae-Wook Kang

    (Jeonbuk National University)

  • Wenxi Liang

    (Huazhong University of Science and Technology (HUST)
    Optics Valley Laboratory)

  • Haisheng Song

    (Huazhong University of Science and Technology (HUST))

  • Jiajun Luo

    (Huazhong University of Science and Technology (HUST))

  • Jiang Tang

    (Huazhong University of Science and Technology (HUST)
    Optics Valley Laboratory)

Abstract

Rare earth ions with d-f transitions (Ce3+, Eu2+) have emerged as promising candidates for electroluminescence applications due to their abundant emission spectra, high light conversion efficiency, and excellent stability. However, directly injecting charge into 4f orbitals remains a significant challenge, resulting in unsatisfied external quantum efficiency and high operating voltage in rare earth light-emitting diodes. Herein, we propose a scheme to solve the difficulty by utilizing the energy transfer process. X-ray photoelectron spectroscopy and transient absorption spectra suggest that the Cs3CeI6 luminescence process is primarily driven by the energy transfer from the I2-based self-trapped exciton to the Ce-based Frenkel exciton. Furthermore, energy transfer efficiency is largely improved by enhancing the spectra overlap between the self-trapped exciton emission and the Ce-based Frenkel exciton excitation. When implemented as an active layer in light-emitting diodes, they show the maximum brightness and external quantum efficiency of 1073 cd m−2 and 7.9%, respectively.

Suggested Citation

  • Longbo Yang & Hainan Du & Jinghui Li & Yiqi Luo & Xia Lin & Jincong Pang & Yuxuan Liu & Liang Gao & Siwei He & Jae-Wook Kang & Wenxi Liang & Haisheng Song & Jiajun Luo & Jiang Tang, 2024. "Efficient deep-blue electroluminescence from Ce-based metal halide," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50508-5
    DOI: 10.1038/s41467-024-50508-5
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    References listed on IDEAS

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    1. Zema Chu & Yang Zhao & Fei Ma & Cai-Xin Zhang & Huixiong Deng & Feng Gao & Qiufeng Ye & Junhua Meng & Zhigang Yin & Xingwang Zhang & Jingbi You, 2020. "Large cation ethylammonium incorporated perovskite for efficient and spectra stable blue light-emitting diodes," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    2. Jiajun Luo & Xiaoming Wang & Shunran Li & Jing Liu & Yueming Guo & Guangda Niu & Li Yao & Yuhao Fu & Liang Gao & Qingshun Dong & Chunyi Zhao & Meiying Leng & Fusheng Ma & Wenxi Liang & Liduo Wang & Sh, 2018. "Efficient and stable emission of warm-white light from lead-free halide double perovskites," Nature, Nature, vol. 563(7732), pages 541-545, November.
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