Reversible Mn valence state switching in submicron α-Al2O3:Mn by soft X-rays and blue light – a potential pathway towards multilevel optical data storage
| Autor: | Norfadira Wahib, Nicolas Riesen, Hans Riesen |
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| Přispěvatelé: | Wahib, Norfadira, Riesen, Nicolas, Riesen, Hans |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Physical Chemistry Chemical Physics. 24:6155-6162 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/d1cp05737e |
| Popis: | Refereed/Peer-reviewed The generation of Mn4+ in α-Al2O3:Mn3+ by soft X-ray exposure is demonstrated with a large dynamic range of the X-ray generated Mn4+ luminescence signal, indicating the potential use of α-Al2O3:Mn3+ for multilevel optical data storage. Samples with a range of Mn concentrations (0.05, 0.1, 0.2, 0.4, 0.6 and 1.2 atom%) were prepared via a facile combustion method and the sample with 0.4 atom% was found to display the highest luminescence intensity. The stored information can be read out via the R-lines (2E -> 4A2) under ∼470 nm (4A2 -> 4T2), or ∼630 nm (4A2 -> 2T1) excitation with the latter being preferred since photobleaching is minimized. Interestingly, the Mn4+ valence state can be fully switched back to Mn3+ by blue light exposure (e.g., 462 nm laser diode). The stored information could be repeatedly written and erased, showing no significant deterioration over five consecutive cycles, with less than 5% uncertainty. |
| Databáze: | OpenAIRE |
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