EPR and optical investigation of europium doped Ba2Mg3F10

Abstract

A recent investigation of the (BaF -MgF ) phase diagram produced several new compounds which are suitable hosts for Rare Earth of each of them to a specific barium lattice site. The luminescence emission of both the 4f -4f 5d and the 4f -4f transitions is observed.6 8The relative importance of the two emissions is strongly temperature dependent. The emission intensities of the intra f-shell P → S 7 / 2 7 / 2 6 transitions increase strongly on going from 295 K to 77 K. Thus, the lowest levels of the 4f 5d configuration are approximately 6 degenerate with the P manifold. © 1998 Elsevier Science S.A. / 2

Light-induced valence-state switching in BaFCl:La and SrFCl:La

“…The analysis of the EPR and ENDOR spectra was performed as described, for instance, in Ref. 13. Optical-absorption measurements were realized on a Cary 2300 instrument or on a modified Unicam SP800 ͑200-800 nm͒ instrument.…”

Synthesis and crystal structures of Ba6Mg11F34 and the solid solutions Ba6Mg11−xM(II)xF34 (M(II) = Mn, Fe) and luminescence of Ba6Mg11F34: Eu2+

“…[2] can be seen in the emission spectra of Ba 6 Mg 11 F 34 . However, these spectra are clearly distinguishable from those of Eu 2þ doped Ba 2 Mg 3 F 10 [7].…”

“…Several phases of the BaF 2 -MgF 2 system have also been doped with rare earth elements and their luminescence properties have been studied to find new lamp phosphors or luminescent thin layer materials for coatings [3][4][5][6][7]. The reasons for the bright emission observed for these compounds are the non-centrosymmetric Ba sites which are occupied by the rare earth ions.…”

Inter- and intra-configurational transitions of europium (II) in Ba2Mg3F10

“…Figure 1 presents the Ba 2 Mg 3 F 10 crystal structure; there are two different Ba 2+ sites and both have C s (m) site symmetry. A previous electron paramagnetic resonance (EPR) investigation of europium doped Ba 2 Mg 3 F 10 single crystals has shown that the Eu 2+ impurity occupies both barium lattice sites [13]. In this paper we present luminescence data for Eu 2+ ions in the Ba 2 Mg 3 F 10 host.…”