lu3+/yb3+ and lu3+/er3+ co-doped antimony selenide nanomaterials: synthesis, characterization, electrical, thermoelectrical and optical properties

lu3+/yb3+ and lu3+/er3+ co-doped sb2se3 nanomaterials were synthesized by a co-reduction method in hydrothermal condition. powder xrd patterns indicate that the lnxln′xsb2-2xse3 ln: lu3+/yb3+ and lu3+/er3+ crystals (x= 0.00-0.04) are isostructural with sb2se3. the cell parameters were increased for compounds upon increasing the dopant content (x). sem and tem images show that co-doping of lu3+/yb3+ ions in the lattice of sb2se3 results in nanorods while that in lu3+/er3+ leads to nanoparticles, respectively. the electrical conductivity of co-doped sb2se3 is higher than the pure sb2se3, and increases with temperature. by increasing concentration of ln3+ ions, the absorption spectrum of sb2se3 shows red shifts and someintensity changes. in addition to the characteristic red emission peaks of sb2se3, emission spectra of co-doped materials show other emission bands originating from f-f transitions of the yb3+ ions.