Luminescence and Magnetic Properties of Novel Nanoparticle-Sheathed 3D Micro-Architectures of Fe0.5R0.5(MoO4)(1.5):Ln(3+) (R = Gd3+, La3+), (Ln = Eu, Tb, Dy) for Bifunctional Application

作者：Krishnan Rajagopalan; Thirumalai Jagannathan^*; Kathiravan Arunkumar

来源：Electronic Materials Letters, 2015, 11(1): 24-33.

DOI：10.1007/s13391-014-4167-6

• chemical synthesis
• electron diffraction
• crystal structure
• optical properties
• magnetic measurements

For the first time, we report the successful synthesis of novel nanoparticle-sheathed bipyramid-like and almond-like Fe0.5R0.5(MoO4)(1.5):Ln(3+) (R = Gd3+, La3+), (Ln = Eu, Tb, Dy) 3D hierarchical microstructures through a simple disodium ethylenediaminetetraacetic acid (Na(2)EDTA) facilitated hydrothermal method. Interestingly, time-dependent experiments confirm that the assembly-disassembly process is responsible for the formation of self-aggregated 3D architectures via Ostwald ripening phenomena. The resultant products are characterized by x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), photoluminescence (PL), and magnetic measurements. The growth and formation mechanisms of the self-assembled 3D micro structures are discussed in detail. To confirm the presence of all the elements in the microstructure, the energy loss induced by the K, L shell electron ionization is observed in order to map the Fe, Gd, Mo, O, and Eu components. The photo luminescence properties of Fe0.5R0.5(MoO4)1.5 doped with E3+, Th3+, Dy3+ are investigated. The room temperature interaction between the local-fields introduced by the magnetic Fe determine the magnetism in Fe3+ ions and the R3+ (La, Gd) ions in the dodecahedral sites determine the magnetism in Fe0.5R0.5(MoO4)(1.5):Ln(3+) This work provides a new approach to synthesizing the novel Fe0.5R0.5(MoO4)(1.5):Ln(3+) for bi-functional magnetic and luminescence applications.

• 出版日期2015-1