ISSN:2321-6212

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Structural adjusting and luminescence property refinement of NaSr2Nb5O15:0.03Eu3+ phosphors


4th International Conference and Expo on Ceramics and Composite Materials

May 14-15, 2018 | Rome, Italy

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

DOI: 10.4172/2321-6212-C1-015

Abstract

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