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Fluorides

Fluorides

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Luminescent fluoride glasses and glass-ceramics
From bulk to thin films

Down-conversion processes may be exploited to convert the frequencies of the solar spectrum from blue-UV to the region of maximum absorption of the cell. Thin glassy or glass-ceramic films doped with rare earth ions proved to be very suitable for this purpose.

Storage phosphors are commercially the most successful digital detectors for replacing the film-screen systems. A new promising X-ray storage phosphor is BaBrCl:Eu2+. Transparent glass ceramics containing BaBrCl:Eu2+ nanocrystals allow to improve the spatial resolution. The image is read out using a low cost LED (675 nm).

Rare-earth doped fluoride glass are well adapted to frequency up-conversion of near-IR to visible light, using commercially available IR diode laser (980 nm). Red-Green-Blue (RGB) emission have been obtained in Er3+/Tm3+/Yb3+tridoped glasses. Planar fluoride glass film waveguides are thus very attractive to acheive compacts laser sources.

Physical vapor deposition (PVD) is used in Le Mans to produce fluoride thin films. We found some ZrF4 -based glasses suitable for the technique. In the case of ZLAG glass, heat treatment has been performed in-situ thus producing glass ceramics thin films.

Researchers

  • Brigitte Boulard
  • Youping Gao

Related papers

  • Opt. Mater. 2016, 60, 235
  • Lumin. 2018, 193, 22

Fluorinated materials for batteries

The project ANR FLUOBAT project accepted in 2012 has been the initiator of the axis on fluorinated materials for batteries. It was initially devoted to the development of a new concept of all solid-state fluoride ion batteries based on a fluoride anion shuttle working without lithium. In this project, the work of the fluorine team mainly focused on the solid electrolyte in order to identify the optimal chemical composition to achieve the best fluorine ion mobility.

Since, this activity is now extended to the evaluation of lacunar and mixe metal fluorides as cathode materials for Li or Na ion batteries. NMR and Mössbauer spectroscopies are powerful tools to establish the local organization of structures and elucidate the structure-properties relations.

Researchers

  • Jérôme Lhoste
  • Vincent Maisonneuve
  • Annie Ribaud

Related papers

  • Dalton Trans. 2015, 44, 19625
  • Alloys Compd. 2017, 692, 980

Projects

  • ANR FLUOBAT

Design of multifunctional fluorides

This axe is devoted to design new fluorinated materials for catalysis, gas sorption and optical application.

Depending on the size of the structuring agent, it was possible to modulate the porosity of fluoride materials. For example, the combination of an inorganic part containing metal cations and heteroatoms like fluorine ions with original large organic ligands, synthesized with the thematic area “Synthèse Organique”, leads to fluorinated metal organic frameworks (MOF) with large micropores.

Since ten years, the fluorine team has an expertise in the elaboration and characterization of nanofluorides with large specific areas. This association of nanofluorides with polymers (collaboration with thematic area “Polymères”) by using a modified hard-templating method leads to a new family of macro/mesoporous inorganic fluorides with a significant potential in particular for heteregeneous catalysis of fluorinated aromatic molecules.

This transdisciplinary research shows that the oecumenism in chemistry is a powerful way to design new materials for targeted objectives.

 

Researchers

  • Amandine Guiet
  • Jérôme Lhoste
  • Vincent Maisonneuve
  • Annie Ribaud

Related papers

  • Dalton Trans. 2015, 44, 7951
  • Cryst. Growth Des. 2015, 15, 4248
  • Dalton Trans. 2017, 46, 5352
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