Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum
Abstract
Orthorhombic Ta2O5:Er3+ coatings were obtained by plasma electrolytic oxidation (PEO) of tantalum in an alkaline electrolyte with the addition of Er2O3 particles in various concentrations. Down-conversion photoluminescence (PL) emission spectra is featured by sharp bands attributed to 4f–4f transitions of Er3+. The most intense green PL emission band centered at 544 nm is attributed to the 4S3/2 → 4I15/2 emission of Er3+. Population paths of the Er3+ down-conversion PL happen under resonant excitation conditions of the Er3+ from ground state 4I15/2 to higher levels, and via a broad violet charge transfer excitation band. Both excitation energy and Er content have an impact on the PL emission response in Ta2O5:Er3+ coatings. The 4I15/2 → 4G11/2 transition is the dominant excitation pathway for the PL emission of Er3+. Up-conversion PL spectra created after 980 nm irradiation of Ta2O5:Er3+ coatings have characteristic 4f–4f transitions of Er3+. The intensity of the green 4S3/2 → 4I15/2 i...s much higher compared to the red 4F9/2 → 4I15/2 emission of Er3+. Co-doping Ta2O5:Er3+ coatings with sensitizer Yb3+ ions increased the up-conversion emission PL intensity of Er3+ thanks to the efficient energy transfer from Yb3+ to Er3+. The red up-conversion PL intensity of 4F9/2 → 4I15/2 transition increases more rapidly with respect to green emission 4S3/2 → 4I15/2. A phonon-assisted energy back transfer process from Er3+ ions (4S3/2 → 4I13/2) to the neighboring Yb3+ ions (2F7/2 → 2F5/2) leads to enhanced red emission 4F9/2 → 4I15 and decreased green emission 4S3/2 → 4I15/2. © 2023, The Minerals, Metals & Materials Society.
Keywords:
Plasma electrolytic oxidation / Photoluminescence / Down-conversion / Up-conversion / Er3+ / Er3+/Yb3+Source:
Journal of Electronic Materials, 2023Funding / projects:
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200162 (University of Belgrade, Faculty of Physics) (RS-MESTD-inst-2020-200162)
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200017 (University of Belgrade, Institute of Nuclear Sciences 'Vinča', Belgrade-Vinča) (RS-MESTD-inst-2020-200017)
DOI: 10.1007/s11664-023-10658-6
ISSN: 0361-5235; 1543-186X
Scopus: 2-s2.0-85169106741
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VinčaTY - JOUR AU - Stojadinović, Stevan AU - Ćirić, Aleksandar PY - 2023 UR - https://vinar.vin.bg.ac.rs/handle/123456789/11479 AB - Orthorhombic Ta2O5:Er3+ coatings were obtained by plasma electrolytic oxidation (PEO) of tantalum in an alkaline electrolyte with the addition of Er2O3 particles in various concentrations. Down-conversion photoluminescence (PL) emission spectra is featured by sharp bands attributed to 4f–4f transitions of Er3+. The most intense green PL emission band centered at 544 nm is attributed to the 4S3/2 → 4I15/2 emission of Er3+. Population paths of the Er3+ down-conversion PL happen under resonant excitation conditions of the Er3+ from ground state 4I15/2 to higher levels, and via a broad violet charge transfer excitation band. Both excitation energy and Er content have an impact on the PL emission response in Ta2O5:Er3+ coatings. The 4I15/2 → 4G11/2 transition is the dominant excitation pathway for the PL emission of Er3+. Up-conversion PL spectra created after 980 nm irradiation of Ta2O5:Er3+ coatings have characteristic 4f–4f transitions of Er3+. The intensity of the green 4S3/2 → 4I15/2 is much higher compared to the red 4F9/2 → 4I15/2 emission of Er3+. Co-doping Ta2O5:Er3+ coatings with sensitizer Yb3+ ions increased the up-conversion emission PL intensity of Er3+ thanks to the efficient energy transfer from Yb3+ to Er3+. The red up-conversion PL intensity of 4F9/2 → 4I15/2 transition increases more rapidly with respect to green emission 4S3/2 → 4I15/2. A phonon-assisted energy back transfer process from Er3+ ions (4S3/2 → 4I13/2) to the neighboring Yb3+ ions (2F7/2 → 2F5/2) leads to enhanced red emission 4F9/2 → 4I15 and decreased green emission 4S3/2 → 4I15/2. © 2023, The Minerals, Metals & Materials Society. T2 - Journal of Electronic Materials T1 - Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum DO - 10.1007/s11664-023-10658-6 ER -
@article{ author = "Stojadinović, Stevan and Ćirić, Aleksandar", year = "2023", abstract = "Orthorhombic Ta2O5:Er3+ coatings were obtained by plasma electrolytic oxidation (PEO) of tantalum in an alkaline electrolyte with the addition of Er2O3 particles in various concentrations. Down-conversion photoluminescence (PL) emission spectra is featured by sharp bands attributed to 4f–4f transitions of Er3+. The most intense green PL emission band centered at 544 nm is attributed to the 4S3/2 → 4I15/2 emission of Er3+. Population paths of the Er3+ down-conversion PL happen under resonant excitation conditions of the Er3+ from ground state 4I15/2 to higher levels, and via a broad violet charge transfer excitation band. Both excitation energy and Er content have an impact on the PL emission response in Ta2O5:Er3+ coatings. The 4I15/2 → 4G11/2 transition is the dominant excitation pathway for the PL emission of Er3+. Up-conversion PL spectra created after 980 nm irradiation of Ta2O5:Er3+ coatings have characteristic 4f–4f transitions of Er3+. The intensity of the green 4S3/2 → 4I15/2 is much higher compared to the red 4F9/2 → 4I15/2 emission of Er3+. Co-doping Ta2O5:Er3+ coatings with sensitizer Yb3+ ions increased the up-conversion emission PL intensity of Er3+ thanks to the efficient energy transfer from Yb3+ to Er3+. The red up-conversion PL intensity of 4F9/2 → 4I15/2 transition increases more rapidly with respect to green emission 4S3/2 → 4I15/2. A phonon-assisted energy back transfer process from Er3+ ions (4S3/2 → 4I13/2) to the neighboring Yb3+ ions (2F7/2 → 2F5/2) leads to enhanced red emission 4F9/2 → 4I15 and decreased green emission 4S3/2 → 4I15/2. © 2023, The Minerals, Metals & Materials Society.", journal = "Journal of Electronic Materials", title = "Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum", doi = "10.1007/s11664-023-10658-6" }
Stojadinović, S.,& Ćirić, A.. (2023). Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum. in Journal of Electronic Materials. https://doi.org/10.1007/s11664-023-10658-6
Stojadinović S, Ćirić A. Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum. in Journal of Electronic Materials. 2023;. doi:10.1007/s11664-023-10658-6 .
Stojadinović, Stevan, Ćirić, Aleksandar, "Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum" in Journal of Electronic Materials (2023), https://doi.org/10.1007/s11664-023-10658-6 . .