Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/134624
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Spin-forbidden near-infrared luminescence from a F₃⁺ colour centre generated upon annealing in mechanochemically prepared nanocrystalline BaLiF₃. |
Author: | Chowdhury, N. Hutchison, W. Riesen, N. Krausz, E. Riesen, H. |
Citation: | Nanoscale, 2022; 14(8):3279-3288 |
Publisher: | Royal Society of Chemistry (RSC) |
Issue Date: | 2022 |
ISSN: | 2040-3364 2040-3372 |
Statement of Responsibility: | Nishita Chowdhury, Wayne Hutchison, Nicolas Riesen, Elmars Krausz and Hans Riesen |
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. |
Rights: | © The Royal Society of Chemistry 2022 |
DOI: | 10.1039/d1nr06866k |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1039/d1nr06866k |
Appears in Collections: | Earth and Environmental Sciences publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.