Synthesis and characterization of new Ln xSb 2− xSe 3 (Ln: Yb 3+, Er 3+) nanoflowers and their physical properties

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New Ln x Sb 2− x Se 3 (Ln: Yb 3+, Er 3) based nanomaterials were synthesized by a co-reduction method. Powder XRD patterns indicate that the Ln x Sb 2− x Se 3crystals (Ln=Yb 3+, Er 3+, x=0.00–0.12) are isostructural with Sb 2Se 3. The cell parameters b and c decrease for Ln=Er 3+ and Yb 3+ upon increasing the dopant content ( x), while a increases. SEM images show that doping of the lanthanide ions in the lattice of Sb 2Se 3 generally results in nanoflowers. UV–vis absorption and emission spectroscopy reveals mainly electronic transitions of the Ln 3+ ions in case of Yb 3+ doped nanomaterials. Emission spectra of doped materials, in addition to the characteristic red emission peaks of Sb 2Se 3, show additional emission bands centered at 955 nm, originating from the 2F 7/2→ 2F 5/2 transition (f–f transitions) of the Yb 3+ ions. DSC curves indicate that Sb 2Se 3 has the highest thermal stability. The temperature dependence of the electrical resistivity of doped-Sb 2Se 3 with Yb 3+ and Er 3+ was studied.