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SM ISO690:2012 NAZAROV, Michael V., TSUKERBLAT, Boris S.. Optical Lines in Europium and Terbium-Activated Yttrium Tantalate Phosphor: Combined Experimental and Group-Theoretical Analysis. In: Optics, 2023, vol. 4, pp. 510-524. ISSN 2673-3269. DOI: https://doi.org/10.3390/opt4030037 |
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Optics | ||||||
Volumul 4 / 2023 / ISSN 2673-3269 | ||||||
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DOI:https://doi.org/10.3390/opt4030037 | ||||||
Pag. 510-524 | ||||||
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The rare-earth ions in crystals such as terbium (YTaO4:Tb3+) and europium (YTaO4:Eu3+)-activated yttrium tantalate phosphors have a number of attractive features that predetermine their crucial role in practical application in contemporary optoelectronic devices. In this article, we employ the group-theoretical arguments aimed to reveal the group-theoretical classification of the crystal field levels and selection rules for the allowed optical transition between the crystal field components of Tb3+ and Eu3+ of the low symmetry crystal field in the activated yttrium tantalate phosphors. We also establish possible polarization rules for the lines corresponding to the allowed transitions. We deduce the symmetry-assisted results for the selection rules in the optical transitions accompanied by the absorption/emission of the vibrational quanta. The selection rules for the vibronic satellites of the zero-phonon lines are expected to be useful for the identification of the lines in the spectra of rare-earth ions with a weak vibronic coupling. The results of the low-temperature measurements of photoluminescence under the 325 nm excitation are in compliance with the group-theoretical analysis. The aim of the paper is to establish symmetry-assisted results that are the background of the quantitative crystal field theory based on the quantum-mechanical consideration. |
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Cuvinte-cheie crystals YTaO4:Eu3, Tb3, photoluminescence, polarization rules, Stark levels, symmetry, vibronic satellites |
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