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Witkiewicz-Łukaszek, Sandra, 2026, "Optical and EPR study of the Ce3+ luminescent centers in the Lu2SiO5:Ce single crystalline films", https://doi.org/10.18150/WT3RYU, RepOD, V1
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The work presents the results of optical and EPR investigations of Ce3+ incorporation into Lu2SiO5 single crystalline films (LSO:Ce SCFs), grown using the liquid phase epitaxy method. It also examines the conversion of Ce valence state as a result of the LSO:Ce SCF thermal treatment in reducing and oxygen-rich atmospheres. The EPR study revealed the presence of only one type of Ce3+ center (Ce1), corresponding to the localization of Ce3+ ions in sevenfold coordinated positions within the Lu2SiO5 host. No spectra of Ce2 centers (sixfold coordinated Ce3+ positions) were detected in the LSO:Ce SCF films, indicating their negligibly small concentration. High-temperature annealing of the as grown films in air reduces the concentration of Ce3+ ions to a level undetectable by EPR, due to the Ce3+ Ce4+ conversion. In contrast, thermal treatment in a 95%N2 + 5%H2 reducing atmosphere results in the opposite Ce4+ Ce3+ conversion, substantially increasing the concentration of Ce3+. The oxidation/reduction treatment and Ce³⁺/Ce⁴⁺ valence state changing lead to notable variations in the scintillation light yield and decay kinetics of the LSO:Ce SCFs, offering a method to tune their scintillation figure of merit.
Lu2SiO5 orthosilicates, Lu2SiCe3+ dopant, liquid phase epitaxy, single crystalline films, absorption, luminescence, scintillation, EPR
Laguta, V., Nikl, M., Trubitsyn, M., Gorbenko, V., Iskaliyeva, A., Zagorodniy, Y., Sidletskiy, O., & Zorenko, Y. (2026). *Optical and electron paramagnetic resonance study of the Ce³⁺ luminescent centers in Lu₂SiO₅:Ce single crystalline films. The Journal of Physical Chemistry C, 130*(4), 1597–1608. https://pubs.acs.org/doi/10.1021/acs.jpcc.5c07524 doi: https://doi.org/10.1021/acs.jpcc.5c07524
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