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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2508.10953 |
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| _version_ | 1866909737130393600 |
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| author | Ianhez-Pereira, C. Kaneko, U. F. Rodrigues, A. D. de Oliveira, I. S. S. de Godoy, M. P. F. |
| author_facet | Ianhez-Pereira, C. Kaneko, U. F. Rodrigues, A. D. de Oliveira, I. S. S. de Godoy, M. P. F. |
| contents | Controlling the optical properties of rare-earth ions in wide-bandgap semiconductors remains a major challenge in the development of next-generation photonic materials. Here, we show that external hydrostatic pressure modulates the structural characteristics of ZnO thin films and, in turn, tunes the optical emission behavior of embedded Eu3+ ions. By combining in situ synchrotron X-ray diffraction and photoluminescence spectroscopy under high-pressure conditions with first-principles calculations, we capture a pressure-induced phase transition from the hexagonal wurtzite to the cubic rocksalt structure near 10 GPa. This transformation is accompanied by complete quenching of the D0 - FJ Europium emissions near the transition threshold, followed by a partial recovery at higher pressures, likely associated with the emergence of structural disorder. Concurrently, the Stark components of the emission bands exhibit a redshift and significant broadening with increasing pressure, reflecting enhanced crystal field strength as interatomic distances decrease. Additional first-principles calculations support the observed pressure-induced shifts in the Eu-4f states and emphasize the influence of lattice symmetry on their electronic environment. These results show that hydrostatic pressure is an effective way to adjust the optical emissions of rare-earth ions by changing their symmetry and local environment, providing a basis for designing photonic devices and luminescent materials controlled by pressure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_10953 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tunable optical emissions of Eu3+ ions enabled by pressure-driven phase transition in ZnO Ianhez-Pereira, C. Kaneko, U. F. Rodrigues, A. D. de Oliveira, I. S. S. de Godoy, M. P. F. Materials Science Optics Controlling the optical properties of rare-earth ions in wide-bandgap semiconductors remains a major challenge in the development of next-generation photonic materials. Here, we show that external hydrostatic pressure modulates the structural characteristics of ZnO thin films and, in turn, tunes the optical emission behavior of embedded Eu3+ ions. By combining in situ synchrotron X-ray diffraction and photoluminescence spectroscopy under high-pressure conditions with first-principles calculations, we capture a pressure-induced phase transition from the hexagonal wurtzite to the cubic rocksalt structure near 10 GPa. This transformation is accompanied by complete quenching of the D0 - FJ Europium emissions near the transition threshold, followed by a partial recovery at higher pressures, likely associated with the emergence of structural disorder. Concurrently, the Stark components of the emission bands exhibit a redshift and significant broadening with increasing pressure, reflecting enhanced crystal field strength as interatomic distances decrease. Additional first-principles calculations support the observed pressure-induced shifts in the Eu-4f states and emphasize the influence of lattice symmetry on their electronic environment. These results show that hydrostatic pressure is an effective way to adjust the optical emissions of rare-earth ions by changing their symmetry and local environment, providing a basis for designing photonic devices and luminescent materials controlled by pressure. |
| title | Tunable optical emissions of Eu3+ ions enabled by pressure-driven phase transition in ZnO |
| topic | Materials Science Optics |
| url | https://arxiv.org/abs/2508.10953 |