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Z. Naturforsch. 2014, 69b, 193 – 204
doi:10.5560/ZNB.2014-3290
Development of Nd3+-doped Monoclinic Dimolybdates La2Mo2O9 as Optical Materials
Małgorzata Guzik1, Magdalena Bieza1, Elbieta Tomaszewicz2, Yannick Guyot3, and Georges Boulon3
1 Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie Street, 50-383 Wrocław, Poland
2 Department of Inorganic and Analytical Chemistry, West Pomeranian University of Technology, Al. Piastów 42, 71-065 Szczecin, Poland
3 Institute Light Matter, UMR5306 CNRS-University Lyon1, University of Lyon, 69622 Villeurbanne, France
Reprint requests to Dr. Małgorzata Guzik. Fax: +48 71 328 23 48. E-mail: goguzik@poczta.fm
Received October 9, 2013 / published online February 17, 2014
The work presented is mainly focused on synthesis and study of structural and optical properties of microcrystalline Nd3+-doped monoclinic dilanthanum dimolybdate at both room and cyrogenic temperatures (4 K and 77 K). These compounds might be useful for application in the future as optical materials and also as transparent ceramics when the structure is cubic. The Nd3+-doped phases with monoclinic structure (α-form, space group P21, unit cell parameters a = 7.1426, b = 7.1544, c = 7.1618 Å and β =89.538°) were observed for a concentration of the optically active ions equal to 5 %. When the concentration of the Nd3+ ions is higher than 15 %, a cubic structure is formed (β-form, space group P213, with the lattice parameter a = 7.155 ± 0.005 Å). A series of Nd3+-doped La2Mo2O9 phases with different concentration of Nd3+ were prepared using conventional solid-state reactions. The formation of phase-pure Nd3+-doped La2Mo2O9 has been monitored by powder X-ray diffraction, DSC, SEM, Raman, and FT-IR absorption techniques. High-resolution absorption and emission spectra, as well as the dynamics of the Nd3+ excited states characterized by decay time measurements were recorded from room temperature to 4 K. At least two slightly different crystallographic sites are available for the Nd3+ ions. First results show that this new Nd3+-doped monoclinic La2Mo2O9 molybdate phosphor is promising for applications of ultra-short pulse lasers.
Key words: Nd3+ Emission, Monoclinic System, Molybdates, Near-infrared Luminescence, Powder Lasers
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