Solid state synthesis, microstructure and photoluminescence of Eu~(3+) and Tb~(3+) activated strontium tungstate

摘要

The Eu~(3+) and Tb~(3+) ions activated SrWO_4 phosphors have been synthesized by solid state method. The crystal structures and morphologies of the products are characterized by Powders X-ray Diffraction (XRD) and scanning electronic microscopy (SEM). The results indicated that both SrWO_4:Eu~(3+) and SrWO_4:Tb~(3+) phosphors belong to tetragonal phase, and the particles of the phosphors become aggregate with the increase of calcinations temperature. Analyzed by luminescent spectra, the dominant emission of Eu~(3+) in SrWO_4 which is the typical hypersensitive transition ~5D_0→~7F_2 (613 nm), and the green emission (~5D_4→~ 7F_5) intensity of Tb~(3+) in SrWO_4:Tb~(3+) is also dominant. The reaction temperature had obvious influence on the luminescent properties. The intensity reached the strongest when it is sintered at 900 ℃. Therefore, we can try to select the right temperature in order to obtain the ideal product.