Synthesis of rare earth complexes Sm_1-xTb_x(TTA)₃phen as light conversion agent and surface modification by SiO₂

In order to increase the transfer capacity and ultraviolet light stability of rare earth complexes, a series of doping complexes Sm_1-xTb_x(TTA)₃phen are synthesized by chemical precipitation method as light conversion agent, where HTTA stands for 2-thenoyltrifluoroacetone, phen denotes 1, 10-phenanthroline, x is the mole fraction of doping elements, then coated by SiO₂. The characteristics of the complexes are analyzed using IR spectrum, UV-visible absorption and fluorescence spectroscopy. The results show that the structure of Sm_1-xTb_x(TTA)₃phen are similar to Sm(TTA)₃hen, and the UV absorption peaks of Sm_1-xTb_x(TTA)₃phen are depended on organic ligands. Photoluminescence measurements indicate that the complexes emit strong luminescence, which is determined by the transitions of center samarium ion under UV radiation. The strongest luminescence of Sm_0.5Tb_0.5(TTA)₃phen is at 647 nm, up to 8.0×10⁶ cps. The luminescence of Sm_1-xTb_x(TTA)₃ is enhanced with the addition of sensitized elements Tb³⁺. Parceled by SiO₂, anti-decay is significantly enhanced.