Optical Properties and Electron Paramagnetic Resonance Spectra of Zirconium Fluoride- and Hafnium Fluoride-Based Glasses Activated with MnO2 and EuF2
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We have studied luminescence and electron paramagnetic resonance (EPR) spectra of manganese- and europium-activated fluorozirconate glasses in the ZrF4–BaF2–LaF3–AlF3–NaF (ZBLAN) system and fluorohafnate glasses in the HfF4–BaF2–LaF3–AlF3–NaF (HBLAN) system in order to assess the oxidation state and spatial distribution of the activator ions. The manganese luminescence band has been shown to shift from the green (545 nm) to the red (610 nm) spectral region, and additional lines in the EPR spectrum of manganese have been observed to emerge in the EPR spectrum of manganese as a result of BaCl2 substitution for BaF2 in the ZBLAN glass. The ratio of the concentration of free activator ions to that of clustered ions has been estimated quantitatively. It has been shown that, at high doping levels, the manganese and europium ions in the glasses are predominantly clustered, and only a small part of them are present as isolated ions.
Keywords:fluorozirconate glasses modification luminescence electron paramagnetic resonance manganese and europium ions glass-ceramics
In this research, we used equipment at the Shared Physical Characterization Facilities Center (Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences; Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences; and Prokhorov General Physics Institute, Russian Academy of Sciences), supported by the Russian Federation Ministry of Science and Higher Education (state research targets for the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences; the Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences; and the Prokhorov General Physics Institute, Russian Academy of Sciences; basic research).
The investigation of the optical properties and electron paramagnetic resonance spectra of the manganese ions was supported by the Russian Science Foundation, project no. 18-13-00407.
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