科研之友
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摘要
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 (4K and 77K). 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 (alpha-form, space group P21, unit cell parameters a = 7.1426, b = 7.1544, c = 7.1618 angstrom and beta = 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 (beta-form, space group P2(1)3, with the lattice parameter a = 7.155 0.005 angstrom). 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 4K. 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.
- 出版日期2014-2
