Luminescence Investigation of BaMgF4 Ceramics Under VUV Synchrotron Excitation


Zhunusbekov A.M. Strelkova A.V. Karipbayev Z.T. Kumarbekov K.K. Akilbekov A. Kassymkhanova R.N. Kassymzhanov M.T. Smortsova Y. Popov A.I.
February 2025Multidisciplinary Digital Publishing Institute (MDPI)

Crystals
2025#15Issue 2

The luminescence properties of BaMgF4 ceramics synthesized using electron beam-assisted synthesis were investigated under vacuum ultraviolet (VUV) synchrotron excitation at a cryogenic temperature of T = 9 K. Their excitation spectra, measured over the 4–10.8 eV range, and corresponding luminescence spectra revealed a complex multicomponent structure with emission maxima at 3.71, 3.55, 3.33, 3, and ~2.8 eV. The primary luminescence band at 330 nm was attributed to self-trapped excitons (STE) excited near the band edge (9.3–9.7 eV), indicating interband transitions and subsequent excitonic relaxation. Bands at 3 and ~2.8 eV were associated with defect states efficiently excited at 6.45 eV, 8 eV and high-energy transitions near 10.3 eV. The excitation spectrum showed distinct maxima at 5, 6.45, and 8 eV, which were interpreted as excitations of defect-related states. These results highlight the interplay between interband transitions, excitonic processes, and defect-related luminescence, which defines the complex dynamics of BaMgF4 ceramics. These findings confirm that radiation synthesis introduces defect centers influencing luminescent properties, making BaMgF4 a promising material for VUV and UV applications.

barium magnesium fluoride , ceramics , VUV excitation

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Institute of Physical and Technical Sciences, L.N. Gumilyov, Eurasian National University, Astana, 010008, Kazakhstan
Deutsches Elektronen-Synchrotron DESY, Hamburg, 22603, Germany
Institute of Solid State Physics, University of Latvia, 8 Kengaraga, Riga, LV-1063, Latvia

Institute of Physical and Technical Sciences
Deutsches Elektronen-Synchrotron DESY
Institute of Solid State Physics

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