DEMOURGUES, Alain; TRESSAUD, Alain

doi:10.1002/9781118409466.ch64

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DEMOURGUES, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

TRESSAUD, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Efficient preparations of fluorine compounds, Efficient preparations of fluorine compounds. 2013p. 415-424

Wiley

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Rare earth-based mixed-anion compounds containing sulfur atoms have been largely investigated for their outstanding optical properties, particularly in absorption and luminescence fields. Rare earth esquisulfides Ln2S3 and ALn2S4 (A = Ca, Sr) have been proposed as inorganic color pigments, because they exhibit pronounced colors ranging from yellow to red, depending on the rare earth [1, 2]. Rare earth-based oxide sulfides have also been largely investigated for their specific properties in luminescence fields [3]. These materials are used, for instance, as cathode-ray phosphors present in color TV screens or as X-ray phosphors in conventional intensifying screens in radiography [4]. It has been recently shown that the presence of fluorine in the lattice leads to remarkable behavior: On the one hand, LnSF-type rare earth fluorosulfides exhibit good chromatic properties and high stability in acidic medium and are, therefore, good candidates as inorganic color pigments [5]. On the other hand, complex La-based fluorosulfides and oxyfluorosulfides display noteworthy absorption in the ultraviolet (UV) range [6–8]...< Réduire

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Preparation of rare earth fluorosulfides and oxyfluorosulfides

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