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<p>This study investigates the mechanisms underlying the ultrafast cross-luminescence observed in BaF<sub>2</sub> crystals doped with LaF<sub>3</sub>. We identified an ultrafast luminescent component with a decay time of approximately 150 ps, which emerges under excitation energies exceeding 24&#xa0;eV as a <i>novel radiative recombination process</i> between electrons in the 5p core band of Ba<sup>2+</sup> and holes in the 5p core band of La<sup>3+</sup>. Ab initio calculations supported this hypothesis, showing that the energy levels of the core bands facilitate such transitions. The findings indicated that BaF<sub>2</sub>-LaF<sub>3</sub> scintillators hold significant promise for the detection of ultrafast processes in high-energy physics and medical applications.</p>

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Ultrafast core-to-core luminescence in BaF2 - LaF3 single crystals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月22日

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  • Roman Shendrik,
  • Evgeny Radzhabov,
  • Alexandra Myasnikova,
  • Viktorija Pankratova,
  • Anatolijs Šarakovskis,
  • Alexander Nepomnyashchikh,
  • Alexander Bogdanov,
  • Veronika Gavrilenko,
  • Ekaterina Kaneva,
  • Dmitry Sofich,
  • Tatiana Garmysheva,
  • Vladimir Pankratov

摘要

This study investigates the mechanisms underlying the ultrafast cross-luminescence observed in BaF2 crystals doped with LaF3. We identified an ultrafast luminescent component with a decay time of approximately 150 ps, which emerges under excitation energies exceeding 24 eV as a novel radiative recombination process between electrons in the 5p core band of Ba2+ and holes in the 5p core band of La3+. Ab initio calculations supported this hypothesis, showing that the energy levels of the core bands facilitate such transitions. The findings indicated that BaF2-LaF3 scintillators hold significant promise for the detection of ultrafast processes in high-energy physics and medical applications.