Print Email Facebook Twitter Thermal quenching of Eu2+ emission in Ca- and Sr-Ga2S4 in relation with VRBE schemes Title Thermal quenching of Eu2+ emission in Ca- and Sr-Ga2S4 in relation with VRBE schemes Author Dobrowolska, A.P. (TU Delft RST/Fundamental Aspects of Materials and Energy; Wroclaw University of Economics and Business) Dierre, B.F.P.R. (TU Delft RST/Fundamental Aspects of Materials and Energy) Fang, C.M. (Brunel University) Hintzen, H.T.J.M. (TU Delft RST/Fundamental Aspects of Materials and Energy) Dorenbos, P. (TU Delft RST/Fundamental Aspects of Materials and Energy) Date 2016-12-27 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. Subject SrGa2S4CaGa2S4ThiogallateVRBEThermal quenching To reference this document use: http://resolver.tudelft.nl/uuid:db8b1a35-0160-4ce0-bcef-48cec1201465 DOI https://doi.org/10.1016/j.jlumin.2016.12.022 Embargo date 2019-01-04 ISSN 0022-2313 Source Journal of Luminescence, 184, 256-261 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2016 A.P. Dobrowolska, B.F.P.R. Dierre, C.M. Fang, H.T.J.M. Hintzen, P. Dorenbos Files PDF Manuscript_and_figures_re ... script.pdf 4.57 MB Close viewer /islandora/object/uuid:db8b1a35-0160-4ce0-bcef-48cec1201465/datastream/OBJ/view