Laguta Oleksii V, Razdobreev Igor M
Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200, Brno, Czech Republic.
UMR 8523 - PHLAM - Physique des Lasers Atomes et Molécules, CERLA, Univ. Lille, CNRS, 59000, Lille, France.
Sci Rep. 2021 Apr 8;11(1):7766. doi: 10.1038/s41598-021-87290-z.
For over the past two decades it has been believed that the intense orange-red photoluminescence in Bismuth-doped materials originates from Bi[Formula: see text] ions. Based on the results from magnetic circular polarization experiments, we demonstrate that this hypothesis fails for Bismuth-doped silica glasses. Our findings contradict the generally accepted statement that the orange-red luminescence arises from [Formula: see text] [Formula: see text] [Formula: see text] transition in a divalent Bismuth ion. The degree of magnetic circular polarization of this luminescence exhibits non-monotonic temperature and field dependencies, as well as sign reversal. This complex behaviour cannot be explained under the assumption of a single Bi[Formula: see text] ion. The detailed analysis enables us to construct a consistent diagram of energy levels involved in the magneto-optical experiments and propose a new interpretation of the nature of orange-red luminescence in Bismuth-doped silica glass. A centre responsible for this notorious photoluminescence must be an even-electron system with an integer total spin, presumably a dimer of Bismuth ions or a complex consisting of Bi[Formula: see text] and an oxygen vacancy.
在过去的二十年里，人们一直认为铋掺杂材料中强烈的橙红色光致发光源于Bi[化学式：见原文]离子。基于磁圆极化实验的结果，我们证明了这一假设对于铋掺杂石英玻璃并不成立。我们的发现与普遍接受的说法相矛盾，即橙红色发光源于二价铋离子中的[化学式：见原文][化学式：见原文][化学式：见原文]跃迁。这种发光的磁圆极化程度表现出非单调的温度和磁场依赖性，以及符号反转。在单个Bi[化学式：见原文]离子的假设下，这种复杂行为无法得到解释。详细的分析使我们能够构建磁光实验中涉及的能级的一致图表，并对铋掺杂石英玻璃中橙红色发光的本质提出新的解释。负责这种著名光致发光的中心必须是一个具有整数总自旋的偶电子系统，大概是铋离子的二聚体或由Bi[化学式：见原文]和一个氧空位组成的复合物。
