Abstract
This paper reports the synthesis of
${{Gd}}_{2}{{SiO}}_{5}$
phosphor by a modified solid-state reaction method. The
sample was characterized by the X-ray diffraction (XRD) technique,
and the XRD spectrum matched with JCPDS card specifically appeared
for
${{Gd}}_{2}{{SiO}}_{5}$
. This is a confirmation of proper preparation of the sample.
Photoluminescence (PL) study of the sample was done. PL excitation
spectra was found at 242, 275, 312 nm while the emission spectra was
found at 380, 416, 439, 489, 545, 589, 607, 617, and 630 nm. The Commission
Internationale de l'Eclairage (CIE) co-ordinate of this phosphor is
${\rm x}= 0.294$
,
${\rm
y}= 0.222$
, in the purplish white color touches white
line boundary. Thermoluminescence (TL) glow curves were recorded for
different doses of
$\gamma$
- ray exposure at a heating rate of
${{6.7}}\ ^{\circ}{{C}}{\cdot}{{s}}^{-1}$
. The kinetic parameters of
${{Gd}}_{2}{{SiO}}_{5}$
have been calculated by using peak shape method. Sample shows general
order kinetics for most of the peaks. Also, the TL glow curves of
the sample were measured at various delay times. With increased delay
time, the intensity of the TL peak decays and the position of the
peak shifts toward a higher temperature, indicating the considerable
re-trapping associated with general order kinetics. The present phosphor
can act as a host for purplish white color emission (touches white
line) for display devices and light emitting diode (LED), as well
as may be used for thermoluminescence dosimetric material under
$\gamma$
dose.
© 2015 IEEE
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