Research & Reviews: Journal of Material Sciences
MenuISSN:2321-6212
ISSN:2321-6212
Shuyao Cao, Chaochao Zhang, Qingju Ning, Feng Gao
Northwestern Polytechnical University, China Shaanxi University of Science & Technology, China
Posters & Accepted Abstracts: Res. Rev. J Mat. Sci
Tetragonal tungsten bronze type NaSr2Nb5O15 offers two kinds of sites with different symmetries for Eu3+ occupying. Based on the selected rules of Eu3+ ionic radiative transition, the luminescence properties of NaSr2Nb5O15: 0.03Eu3+ phosphors could be refined by adjusting the symmetries of crystal structure. In this work, NaSr2(1-x)Nb5O15: 0.03Eu3+ (x=0, 0.02, 0.04, 0.06, 0.08) phosphors were prepared via traditional solid state reaction method. The effects of absent Sr2+ on the crystal structure and luminescence properties was investigated. The phase structures, morphologies, elements, and luminescence properties were characterized by the X-ray diffractometer (XRD), Scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS) and Photoluminescence spectroscopy (PL). The results confirmed that the distortion of [NbO6] octahedrons increased with the absence of Sr2+, whereas the symmetries of the sites occupied by Eu3+ decreased. Following the adjustment of structure, the relative intensity of magnetic-dipole transition (5D0�7F1) could be reduced (~6%), and more excited electrons release energy through electric-dipole transition (5D0�7F2). This work suggested a route for using lattice structural adjustment to refine luminescence properties of tungsten bronze type phosphors. 403843434@qq.com