Structural Refinement, Core–Shell Electron Structure, Enhanced Phosphorescence, and Splitting of 5D0 → 7F2 Transitions in Li-doped Rare Earth Oxide Systems.
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| Title: | Structural Refinement, Core–Shell Electron Structure, Enhanced Phosphorescence, and Splitting of 5D |
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| Authors: | Riyas, K. M.1 (AUTHOR), Sreedevi, S.1 (AUTHOR), Jayaram, Peediyekkal1 (AUTHOR) jayarampnair@gmail.com, Prasannan, Prasoon1 (AUTHOR), Sona, C. P.1 (AUTHOR), Sabna, M.1 (AUTHOR), Khoroshko, Liudmila2,3 (AUTHOR), Baglov, Aleksey2,3 (AUTHOR) |
| Source: | Journal of Electronic Materials. Feb2025, Vol. 54 Issue 2, p1369-1380. 12p. |
| Subjects: | Rare earth oxides, Electric dipole transitions, Physical & theoretical chemistry, X-ray photoelectron spectra, X-ray photoelectron spectroscopy, Photoluminescence, Diffraction patterns |
| Abstract: | Significant crystal field splitting and an enhancement in phosphorescence have been observed in the electric dipole transitions from 5D0 to 7F2 in Li-doped Eu3+:Gd2O3 compounds, which were synthesized using the high-temperature solid-state reaction technique. X-ray diffraction pattern analysis confirmed the formation of single-phase crystals, predominantly exhibiting the monoclinic phase characteristic of Gd2O3. Scanning electron microscopy and subsequent analysis demonstrated a dense distribution of microparticles, with average sizes ranging from 1.5 μm to 2 μm. The application of x-ray photoelectron spectroscopy facilitated the accurate identification of the constituent elements. The narrow-scan x-ray photoelectron spectra distinctly revealed the presence of Eu 3d, Li 1s, Gd 4d, and O 1s signals, and their deconvolution provided valuable insights into the stability of the valence states within the compound systems. Furthermore, the deep-level photoluminescence spectra indicated a significant increase in multiple emissions within the orange–red spectral range. These emissions, attributed to the transitions 5D0 → 7F2, 5D0 → 7F1, and 5D0 → 7F0 states, are associated with the Eu activators, and the observed enhancement in intensity is linked to the crystallographic asymmetries introduced by Li ions. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Significant crystal field splitting and an enhancement in phosphorescence have been observed in the electric dipole transitions from 5D0 to 7F2 in Li-doped Eu3+:Gd2O3 compounds, which were synthesized using the high-temperature solid-state reaction technique. X-ray diffraction pattern analysis confirmed the formation of single-phase crystals, predominantly exhibiting the monoclinic phase characteristic of Gd2O3. Scanning electron microscopy and subsequent analysis demonstrated a dense distribution of microparticles, with average sizes ranging from 1.5 μm to 2 μm. The application of x-ray photoelectron spectroscopy facilitated the accurate identification of the constituent elements. The narrow-scan x-ray photoelectron spectra distinctly revealed the presence of Eu 3d, Li 1s, Gd 4d, and O 1s signals, and their deconvolution provided valuable insights into the stability of the valence states within the compound systems. Furthermore, the deep-level photoluminescence spectra indicated a significant increase in multiple emissions within the orange–red spectral range. These emissions, attributed to the transitions 5D0 → 7F2, 5D0 → 7F1, and 5D0 → 7F0 states, are associated with the Eu activators, and the observed enhancement in intensity is linked to the crystallographic asymmetries introduced by Li ions. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 03615235 |
| DOI: | 10.1007/s11664-024-11651-3 |
