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Structural Investigation and Luminescence Properties of the Ce3(SiS4)2X (X=Cl, Br, I) Family and the La3−xCex(SiS4)2I (0≤x≤1) Solid Solution

✍ Scribed by Regis Riccardi; Delphine Gout; Gilles Gauthier; François Guillen; Stéphane Jobic; Alain Garcia; Denis Huguenin; Pierre Macaudière; Claude Fouassier; Raymond Brec

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 341 KB
Volume: 147
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8253

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✦ Synopsis

Recently prepared Ce 3 (SiS 4 ) 2 I exhibits a strong room temperature luminescence in the blue region of the visible spectrum associated to a Ce III -5d 1 PCe III -4f 1 electronic transition. In order to approach the emission mechanisms, the La 3؊x Ce x (SiS 4 ) 2 I family has been investigated by optical techniques at 6 and 300 K. At low temperature luminescence of the two crystallographically distinct cerium cations was evidenced along with an intrinsic luminescence of the lanthanum matrix. The in6uence of the halogenide on the optical properties has been studied through the substitution of iodine by chlorine and bromine which permits us to follow the increase in energy of the 4f+5d gap in the Cl < Br < I series.

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