4.7 Article

The riddle of orange-red luminescence in Bismuth-doped silica glasses

Journal

SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41598-021-87290-z

Keywords

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Funding

  1. Agence Nationale de la Recherche [12BS04-0019-01]
  2. European Social Fund [CZ.02. 2.69/0.0/0.0/19_074/0016239]

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Recent studies have shown that orange-red luminescence in Bismuth-doped silica glasses may originate from electron systems other than Bi2+ ions, challenging the widely accepted theory. Further research is needed to explore the nature of this complex behavior and confirm the proposed new interpretation of the luminescence mechanism.
For over the past two decades it has been believed that the intense orange-red photoluminescence in Bismuth-doped materials originates from Bi2+ 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 P-2(3/2)(1)-> P-2(1/2) 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 Bi2+ 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 Bi2+ and an oxygen vacancy.

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