Shendrik Roman, Radzhabov Evgeny, Myasnikova Alexandra, Pankratova Viktorija, Šarakovskis Anatolijs, Nepomnyashchikh Alexander, Bogdanov Alexander, Gavrilenko Veronika, Kaneva Ekaterina, Sofich Dmitry, Garmysheva Tatiana, Pankratov Vladimir
Vinogradov Institute of Geochemistry, SB RAS, Favorskii St. 1a, Irkutsk, 664033, Russia.
Institute of Solid State Physics, University of Latvia, 8 Kengaraga, Riga, LV-1063, Latvia.
Sci Rep. 2025 Jul 22;15(1):26558. doi: 10.1038/s41598-025-11505-w.
This study investigates the mechanisms underlying the ultrafast cross-luminescence observed in BaF crystals doped with LaF. 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 Ba and holes in the 5p core band of La. Ab initio calculations supported this hypothesis, showing that the energy levels of the core bands facilitate such transitions. The findings indicated that BaF-LaF scintillators hold significant promise for the detection of ultrafast processes in high-energy physics and medical applications.
本研究探讨了掺LaF的BaF晶体中观察到的超快交叉发光的潜在机制。我们确定了一种超快发光成分，其衰减时间约为150皮秒，在超过24 eV的激发能量下出现，这是Ba的5p核心能带中的电子与La的5p核心能带中的空穴之间一种新型的辐射复合过程。从头算计算支持了这一假设，表明核心能带的能级有利于这种跃迁。研究结果表明，BaF-LaF闪烁体在高能物理和医学应用中的超快过程检测方面具有巨大潜力。
