Diameter Dependent Fluorescent Intensity of Amorphous TbxOy Nanowire Arrays and Their Tunable Fluorescent Intensity Induced by Eu3+/Sm3+ Doping

The amorphous Tb x O y nanowire arrays (NWAs) were synthesized by chemical co-precipitation in porous anodic aluminum oxide (AAO) template with average diameter at about 60, 90, and 260 nm, respectively. The fluorescent intensity of undoped NWAs firstly increased and latterly decreased with increasing diameter excited at 221 nm, and achieved maximal intensity at 90 nm diameter. The fluorescent intensity of Eu or Sm-doped Tb x O y NWAs with average diameter at 90 nm have regular change with increasing doping concentration at characteristic excitation wavelength. The characteristic peaks of Tb present at excitation wavelength of 221 nm, while several characteristic emission peaks of Eu and Sm were observed at excitation wavelength of 394 and 405 nm. Therefore, the characteristic peaks of Tb and doping Eu/Sm were separately manipulated by using characteristic excitation wavelength, which can be a good candidate for application on tunable and selected fluorescent switch.