Spin-forbidden near-infrared luminescence from a F₃⁺ colour centre generated upon annealing in mechanochemically prepared nanocrystalline BaLiF₃.
| dc.contributor.author | Chowdhury, N. | |
| dc.contributor.author | Hutchison, W. | |
| dc.contributor.author | Riesen, N. | |
| dc.contributor.author | Krausz, E. | |
| dc.contributor.author | Riesen, H. | |
| dc.date.issued | 2022 | |
| dc.description.abstract | We report the properties of a unique colour centre in mechanochemically synthesized inverse perovskite BaLiF3 submicron crystals that are luminescent at ∼765 nm. The spin-forbidden luminescence with a lifetime of 5 ms is attributed to a F₃⁺ (F-centre aggregate) in the fluoride octahedra, with three fluoride anion vacancies (3F⁺) filled with two electrons (2e⁻). The Zeeman splitting of the electronic origin and its temperature dependence indicate that the transition is from a singlet excited state to a triplet ground state. The F₃⁺ emission occurred after annealing (≥500 °C) the mechanochemically prepared pure BaLiF₃ nanocrystals and is characterized by a structured emission with a relatively narrow zero-phonon line. A reduction of photoluminescence intensity of the F₃⁺ band upon increasing X-ray dose was observed. Importantly, it is observed that the F₃⁺ luminescence is stable in the dark but bleaches upon exposure to natural sunlight. Our results point to the potential for a new colour centre-based nano-laser in the near-infrared region. Additionally, our experiments also indicate that BaLiF₃ : F₃⁺ has some potential for data storage, and X-ray imaging and dosimetry. | |
| dc.description.statementofresponsibility | Nishita Chowdhury, Wayne Hutchison, Nicolas Riesen, Elmars Krausz and Hans Riesen | |
| dc.identifier.citation | Nanoscale, 2022; 14(8):3279-3288 | |
| dc.identifier.doi | 10.1039/d1nr06866k | |
| dc.identifier.issn | 2040-3364 | |
| dc.identifier.issn | 2040-3372 | |
| dc.identifier.orcid | Riesen, N. [0000-0002-6803-0666] | |
| dc.identifier.uri | https://hdl.handle.net/2440/134624 | |
| dc.language.iso | en | |
| dc.publisher | Royal Society of Chemistry (RSC) | |
| dc.relation.grant | ARC | |
| dc.rights | © The Royal Society of Chemistry 2022 | |
| dc.source.uri | https://doi.org/10.1039/d1nr06866k | |
| dc.title | Spin-forbidden near-infrared luminescence from a F₃⁺ colour centre generated upon annealing in mechanochemically prepared nanocrystalline BaLiF₃. | |
| dc.type | Journal article | |
| pubs.publication-status | Published online |