Mid-IR luminescence of Dy3+ and Pr3+ doped Ga5Ge20Sb10S(Se)65 bulk glasses and fibers

• Published in: Materials letters 2013-06, Vol.101, p.21-24
• Main Authors: Charpentier, F., Starecki, F., Doualan, J.L., Jóvári, P., Camy, P., Troles, J., Belin, S., Bureau, B., Nazabal, V.
• Format: Article
• Language: English
• Subjects: absorption; antimony; Chalcogenide glass; Charge; Compensation; Dysprosium; Emission; energy; EXAFS; Fiber; Fibers; gallium; germanium; Glass; ions; luminescence; Mid-IR emission; Networks; Praseodymium; Preforms; Raman spectroscopy; Rare earth metals; selenium; X-radiation
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2013.03.062

Dy3+ and Pr3+ doped Ga5Ge20Sb10S(Se)65 glasses provide good emission efficiencies in the mid-infrared (mid-IR). The complex glassy network of these chalcogenide glasses were characterized by Raman scattering and extended X-ray absorption fine structure, to put in evidence a structure combining tetrahedra of Germanium and Gallium and trigonal pyramids of Antimony. The arrangement of these structural units permits the introduction of rare earth ions thanks, in particular, to a charge compensation generated by the Ga in a tetrahedral site. Consequently, Pr3+ and Dy3+ ions inserted in such low phonon energy glasses emit efficiently in mid-IR, between 3.5 and 5μm. Finally, Dy3+ and Pr3+ doped Ga5Ge20Sb10S(Se)65 fibers were obtained from bulk glass preform. Efficient emission in mid-IR was obtained by pumping Dy3+ doped Ga5Ge20Sb10S65 and Pr3+ doped Ga5Ge20Sb10S(Se)65 fibers at 920nm and 2μm, respectively. •The structure of Dy3+ or Pr3+ doped Ga5Ge20Sb10S(Se)65 was characterized by Raman spectroscopy and EXAFS.•Pr3+ and Dy3+ ions can be inserted in studied low phonon energy glasses, thanks to the presence of [GaS(Se)4/2]−RE complexes.•In sulfide glasses for a 1wt% of Dy3+concentration, the Dy3+ ions is surrounded by ∼7.9±0.5 sulfur atoms.•Dy3+ or Pr3+ doped Ga5Ge20Sb10S(Se)65 fibers provide efficient emission between 3.5 and 5μm.