Confocal and time-resolved photoluminescence spectra of MgAl₂O₄ spinel crystals irradiated with swift heavy bismuth ions

Authors

Keywords:

MgAl2O4 single crystals, confocal and time-resolved photoluminescence, radiation-induced defects, swift heavy ions, tracks

Abstract

Laser confocal microscopy technique (60 ps laser pulse excitation at 445 nm) and a time-correlated single photon counting (TCSPC) technique have been used to study photoluminescence (PL) in 710 MeV Bi ion irradiated MgAl2O4 single crystals. It was shown that radiation defects produced by swift Bi ions give rise to luminescence with peak at 1.9 eV. Gaussian deconvolution of the PL spectrum reveals that the band consists of three components: the first with a peak at 1.8 eV, the second at 2.1 eV, and the third at 2.35 eV. For the spinel sample irradiated to a fluence of Φ = 1×10¹² ions/cm², both PL and time-resolved photoluminescence (TRPL) spectra were measured as a function of depth within the irradiated layer using a confocal geometry. It was found that with increasing energy loss due to elastic collisions, the PL peak undergoes a redshift, which is more pronounced compared to surface emission measurements.

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Author Biographies

Meruert Mamatova, Joint Institute for Nuclear Research, Dubna, Russian Federation

PhD Student, Engineer

Abdrash Akilbekov, Department of Technical Physics, L.N. Gumilyov Eurasian National University, Astana, Kazakhstan

Professor, Doctor of Physical and Mathematical Sciences

Nikita Kirilkin, Joint Institute for Nuclear Research, Dubna, Russian Federation

Master of Engineering, Researcher

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Published

2025-06-30

How to Cite

Mamatova, M., Akilbekov, A., & Kirilkin, N. (2025). Confocal and time-resolved photoluminescence spectra of MgAl₂O₄ spinel crystals irradiated with swift heavy bismuth ions. Technobius Physics, 3(2), 0034. Retrieved from https://technobius.kz/index.php/phys/article/view/267