Sol–gel processing of BaMgF4–Eu2+ thin films and their violet luminescence

One step synthesis of complex fluoride powders for solid-state lasers

“…Excitation is in form of a broadband around 295 nm. These are in excellent agreement with the literature values [43,44]. Rare earth activated BaMgF 4 thus can be prepared using wet chemical preparation followed by melting at 920 • C. There is no need to go up to the melting points of the constituent fluorides, which are considerably higher.…”

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

“…These batches contained Ba 6 Mg 11 F 34 and an excess of MgF 2 . 6 ] octahedra attached to this motif (Fig. 1).…”

“…The anisotropic displacement parameters of Ba 6 Mg 11 F 34 are given in Table 4 and selected interatomic distances in Table 5. Additional crystallographic information on all the compounds can be obtained from the Fachinformationszentrum Karlsruhe, Germany, crysdata@FIZ-Karlsruhe.de, on quoting the names of the authors, the literature citation, and the following depository numbers: Ba 6 First attempts to synthesize Ba 6 Mg 11 F 34 were carried out in steel vessels. In these batches Fe from the container walls was incorporated into the crystals.…”

“…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.…”

Chemical processing for inorganic fluoride and oxyfluoride materials having optical functions

“…Heat treatments of the coated films should be carried out with care because the decomposition temperature of each metal trifluoroacetate is slightly different. Doping of Eu 2+ ions in BaMgF 4 is achieved by adding Eu 3+ ions to the trifluoroacetate solutions [27]. That is, heat treatments of the films at temperatures of approximately 650 8C in flowing nitrogen atmosphere promote the reduction of Eu 3+ to Eu 2+ .…”