Abstract Luminescence and scintillation properties of Bi 3+ , Sb 3+ , and Eu 2+ -doped LaI 3 and LaBr 3 were explored. Out of the three dopants investigated, Eu 2+ was the most promising new activator for small-bandgap LaX 3 (X = Br, I) and was further studied in the mixed-halide LaBr 3−x I x . Crystals were grown from the melt using the vertical Bridgman method. LaBr 3 :Eu 2+ 0.5% (mol) had the most favorable scintillation properties with a light output of 43,000 ph/MeV and 6% energy resolution at 662 keV. Performance of LaBr 3−x I x :Eu 2+ worsened for most samples as iodide concentration was increased. Room-temperature scintillation of LaI 3 :Eu 2+ 0.1% and 0.5% was observed and is the first case of room-temperature emission reported for doped LaI 3 .

中文翻译：

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研究小带隙 LaX 3 (X = Br, I) 闪烁体的新活化剂

摘要 研究了Bi 3+ 、Sb 3+ 和Eu 2+ 掺杂的LaI 3 和LaBr 3 的发光和闪烁特性。在研究的三种掺杂剂中，Eu 2+ 是最有前途的小带隙 LaX 3 (X = Br, I) 新活化剂，并在混合卤化物 LaBr 3-x I x 中得到进一步研究。使用垂直布里奇曼方法从熔体中生长晶体。LaBr 3 :Eu 2+ 0.5% (mol) 具有最有利的闪烁特性，光输出为 43,000 ph/MeV，662 keV 下的能量分辨率为 6%。随着碘化物浓度的增加，大多数样品的 LaBr 3-x I x :Eu 2+ 的性能恶化。观察到 LaI 3 :Eu 2+ 0.1% 和 0.5% 的室温闪烁，这是掺杂的 LaI 3 室温发射的第一个案例。