Thermal quenching of Eu2+ emission in Ca- and Sr-Ga2S4 in relation with VRBE schemes

Anna Dobrowolska , B. Dierre , C. M. Fang , H. T. Hintzen , P. Dorenbos

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.
Author Anna Dobrowolska (EaE / IChaFT / DNCh)
Anna Dobrowolska,,
- Department of Non-organic Chemistry
, B. Dierre
B. Dierre,,
-
, C. M. Fang
C. M. Fang,,
-
, H. T. Hintzen
H. T. Hintzen,,
-
, P. Dorenbos
P. Dorenbos,,
-
Journal seriesJournal of Luminescence, ISSN 0022-2313, (A 35 pkt)
Issue year2017
Vol184
Pages256-261
Publication size in sheets0.5
Keywords in EnglishSrGa2S4, CaGa2S4, Thiogallate, VRBE, Thermal quenching
DOIDOI:10.1016/j.jlumin.2016.12.022
URL http://www.sciencedirect.com/science/article/pii/S0022231316316556
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 35.0, 03-02-2019, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 03-02-2019, ArticleFromJournal
Publication indicators WoS Impact Factor: 2017 = 2.732 (2) - 2017=2.577 (5)
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