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The work presented is mainly focused on synthesis and study of structural and optical properties of microcrystalline Nd 3+ -doped monoclinic dilanthanum dimolybdate at both room and cyrogenic temperatures (4K 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 Nd 3+  ions is higher than 15%, a cubic structure is formed (β-form, space group P2 1 3, with the lattice parameter a = 7:155±0:005 Å). A series of Nd 3+ - doped La 2 Mo 2 O 9  phases with different concentration of Nd 3+  were prepared using conventional solid-state reactions. The formation of phase-pure Nd 3+ -doped La 2 Mo 2 O 9  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 Nd 3+  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 Nd 3+  ions. First results show that this new Nd 3+ -doped monoclinic La 2 Mo 2 O 9  molybdate phosphor is promising for applications of ultra-short pulse lasers.

Development of Nd 3+ -doped Monoclinic Dimolybdates La 2 Mo 2 O 9 as Optical Materials