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http://bura.brunel.ac.uk/handle/2438/14179| Title: | Thermal quenching of Eu2+ emission in Ca- and Sr-Ga2S4 in relation with VRBE schemes |
| Authors: | Dobrowolska, A Dierre, B Fang, CM Hintzen, HT Dorenbos, P |
| Keywords: | SrGa2S4;CaGa2S4;thiogallate;VRBE;thermal quenching |
| Issue Date: | 27-Dec-2016 |
| Publisher: | Elsevier |
| Citation: | Dobrowolska, A. et al. (2017) 'Thermal quenching of Eu2+ emission in Ca- and Sr-Ga2S4 in relation with VRBE schemes', Journal of Luminescence, 184, pp. 256 - 261. doi: 10.1016/j.jlumin.2016.12.022. |
| Abstract: | Structural and optical properties of MGa2S4 (M = Mg, Zn, Ca, Sr, Ba) compounds have been compared, and the vacuum referred binding energy (VRBE) schemes were constructed for the lanthanide ions in the iso-structural compounds CaGa2S4 and SrGa2S4 employing literature data. The VRBE of an electron in the 5d excited state of Eu2+ was found at 0.75 and 0.97 eV below the bottom of the conduction band (CB) in CaGa2S4:Eu and SrGa2S4:Eu, respectively. Such differences explains the unexpected higher thermal quenching temperature reported for Eu2+-doped SrGa2S4 (T50% = ∼475 K) compared to Eu2+-doped CaGa2S4 (T50% = 400 K) The significantly lower VRBE at the CB-bottom in CaGa2S4 versus SrGa2S4 may be explained by the shorter Ga-S bond lengths in SrGa2S4. |
| URI: | https://bura.brunel.ac.uk/handle/2438/14179 |
| DOI: | https://doi.org/10.1016/j.jlumin.2016.12.022 |
| ISSN: | 0022-2313 |
| Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
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| FullText.pdf | Copyright © 2016 Elsevier B.V. All rights reserved. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1016/j.jlumin.2016.12.022, made available on this repository under a Creative Commons CC BY-NC-ND attribution licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). | 293.93 kB | Adobe PDF | View/Open |
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