title: Decay times of the spin-forbidden and spin-enabled transitions of Yb2+doped in CsCaX3and CsSrX3(X = Cl, Br, I).
abstract: In this paper, a systematic study of the decay times of the spin-enabled and spin-forbidden transitions of Yb2+doped into the halidoperovskites CsMX3(M = Ca, Sr; X = Cl, Br, I) is presented. The spin-forbidden transitions are characterized by ms decay times, which are typical for Yb2+. On the contrary, the spin-enabled transitions show much shorter decay times in the range of μs and have so far only been rarely observed. These results allow detailed conclusions about systematics of the decay times of Yb2+doped in similar compounds and their correlation to the local structure of the coordination sphere of Yb2+as well as the role of vibrational interaction between the excited high spin (HS) and low spin (LS) states. The halidoperovskites are ideally suited as host lattices in this context and may work as text book examples due to their comparable structures, which allows a detailed interpretation of the decay times in relation to the local structure. An understanding of the impact of the composition and structure of the host material on the decay times of Yb2+will be of relevance for future applications of this activator in scintillators or lighting materials.
authors.affiliation: Inorganic Chemistry, Faculty of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57068 Siegen, Germany. wickleder@chemie.uni-siegen.de.
authors.forename: Markus
authors.identifier: http://orcid.org/0000-0001-8024-6665
authors.initials: M
authors.lastname: Suta
authors.affiliation: Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, P.O. Box 80 000, 3584 CC Utrecht, The Netherlands. a.meijerink@uu.nl.
authors.forename: Tim
authors.initials: T
authors.lastname: Senden
authors.affiliation: Inorganic Chemistry, Faculty of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57068 Siegen, Germany. wickleder@chemie.uni-siegen.de.
authors.forename: Jacob
authors.initials: J
authors.lastname: Olchowka
authors.affiliation: Inorganic Chemistry, Faculty of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57068 Siegen, Germany. wickleder@chemie.uni-siegen.de.
authors.forename: Matthias
authors.initials: M
authors.lastname: Adlung
authors.affiliation: Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, P.O. Box 80 000, 3584 CC Utrecht, The Netherlands. a.meijerink@uu.nl.
authors.forename: Andries
authors.initials: A
authors.lastname: Meijerink
authors.affiliation: Inorganic Chemistry, Faculty of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57068 Siegen, Germany. wickleder@chemie.uni-siegen.de.
authors.forename: Claudia
authors.initials: C
authors.lastname: Wickleder