Abstract
Di-barium magnesium silicate doped with Eu
$^{2+}$
and
Tm
$^{3+}$
phosphors were prepared for different concentrations of
Tm
$^{3+}$
ions keeping the concentration of Eu
$^{2+}$
as
0.5 mol%. Photoluminescence (PL) studies of prepared samples were
carried out. Emission spectra exhibited optimum green color emission
at 509 nm when Tm
$^{3+}$
was 1.5 mol%. Emission is expected to arise
due to the transition of Eu
$^{2+}$
ions from any of the sublevels
of 4d
$^{6}$
5f
$^{1}$
to its ground state (
${}^{8}$
S
$_{7/2})$
. This sample with 1.5
mol% of Tm
$^{3+}$
is taken for X-ray diffraction analysis. XRD pattern confirmed
that the sample follows monoclinic structure with C 1 2/c 1 (15) space group. Scanning Electron
Microscope image of the sample exhibited the uniform morphology with
average particle size of 222.54
$\mu$
m . Thermoluminescence (TL) glow curves of the sample
for different UV irradiation were also recorded which presented single
broaden peak centered at about
${{91}}\ ^{\circ}$
C. Phosphorescence
decay curve was indicative of presence of dual exponential decaying
section with a fast decay followed by a long decaying part.
© 2015 IEEE
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