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<p>Lead-free metal halides with low toxicity and great stability have garnered significant interest in the photoelectric fields. Nevertheless, undesirable optical properties caused by parity-forbidden transition restrictions or indirect bandgap characteristics limit the applications of lead-free metal halides. Here, benefiting from the introduction of Sb<sup>3+</sup> ions, intense broad-band green emission resulting from the recombination of self-trapped excitons could be observed in a series of Cs<sub>3</sub>YCl<sub>6</sub>:Sb microcrystals (MCs). Especially, Cs<sub>3</sub>YCl<sub>6</sub>:1%Sb MCs display an outstanding photoluminescence quantum yield of 93.5%. Furthermore, the intense green emission of Cs<sub>3</sub>YCl<sub>6</sub>:1%Sb MCs makes them potential as the green phosphor for the light-emitting diode (LED) application. Besides, under X-ray irradiation, Cs<sub>3</sub>YCl<sub>6</sub>:1%Sb MCs exhibit the great light yield of ∼16000 photons/MeV and the fabricated thin film based on Cs<sub>3</sub>YCl<sub>6</sub>:1%Sb MCs also exhibits promising X-ray imaging ability with the spatial resolution of 9 lp/mm. This work not only offers a promising strategy to improve the optical properties of lead-free metal halides, but also highlights their excellent potential for LED and X-ray imaging applications.</p>

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Sb3+ doped Cs3YCl6 metal halides with highly efficient broad-band green emission for light-emitting diode and X-ray imaging

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Huwei Li,
  • Long Tian,
  • Qingxing Yang,
  • Nan Wang,
  • Xinyu Fu,
  • Li Zhou,
  • Jing Feng,
  • Hongjie Zhang

摘要

Lead-free metal halides with low toxicity and great stability have garnered significant interest in the photoelectric fields. Nevertheless, undesirable optical properties caused by parity-forbidden transition restrictions or indirect bandgap characteristics limit the applications of lead-free metal halides. Here, benefiting from the introduction of Sb3+ ions, intense broad-band green emission resulting from the recombination of self-trapped excitons could be observed in a series of Cs3YCl6:Sb microcrystals (MCs). Especially, Cs3YCl6:1%Sb MCs display an outstanding photoluminescence quantum yield of 93.5%. Furthermore, the intense green emission of Cs3YCl6:1%Sb MCs makes them potential as the green phosphor for the light-emitting diode (LED) application. Besides, under X-ray irradiation, Cs3YCl6:1%Sb MCs exhibit the great light yield of ∼16000 photons/MeV and the fabricated thin film based on Cs3YCl6:1%Sb MCs also exhibits promising X-ray imaging ability with the spatial resolution of 9 lp/mm. This work not only offers a promising strategy to improve the optical properties of lead-free metal halides, but also highlights their excellent potential for LED and X-ray imaging applications.