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conferenceseries
.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Ceramics 2018
May 14-15, 2018
May 14-15, 2018 | Rome, Italy
4
th
International Conference and Expo on
Ceramics and Composite Materials
Structural adjusting and luminescence property refinement of NaSr
2
Nb
5
O
15
:0.03Eu
3+
phosphors
Shuyao Cao
1,2
, Chaochao Zhang
1
, Qingju Ning
2
, Feng Gao
1
1
Northwestern Polytechnical University, China
2
Shaanxi University of Science & Technology, China
T
etragonal tungsten bronze type NaSr
2
Nb
5
O
15
offers two kinds of sites with different symmetries for Eu
3+
occupying. Based
on the selected rules of Eu
3+
ionic radiative transition, the luminescence properties of NaSr
2
Nb
5
O
15
: 0.03Eu
3+
phosphors
could be refined by adjusting the symmetries of crystal structure. In this work, NaSr
2
(1-x)Nb
5
O
15
: 0.03Eu
3+
(x=0, 0.02, 0.04, 0.06,
0.08) phosphors were prepared via traditional solid state reaction method. The effects of absent Sr
2+
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 Sr
2+
, whereas the symmetries of the sites occupied by Eu
3+
decreased. Following the adjustment of structure,
the relative intensity of magnetic-dipole transition (
5
D
0
→
7
F
1
) could be reduced (~6%), and more excited electrons release
energy through electric-dipole transition (
5
D
0
→
7
F
2
). This work suggested a route for using lattice structural adjustment to refine
luminescence properties of tungsten bronze type phosphors.
403843434@qq.comRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C1-015