Abstract
The behavior displayed by thermoluminescence (TL)
glow curve analysis and photoluminescence (PL) spectra of calcium -yttrium-oxide phosphor doped with cerium
at variable concentration
of
${{Ce}}^{3+}$
(0.2–2.5 mol%) ion. Phosphor was prepared by solid
state reaction method with calcination temperature
${{1000}}\ ^{\circ}{{C}}$
and sintering temperature
${{1350}}\ ^{\circ}{{C}}$
in air atmosphere. Synthesized sample was characterized by X-ray
diffraction technique and the crystallite size was calculated by Scherer’s
formula. Surface morphology of prepared phosphor was determined by
scanning electron microscopy. The sample was analyzed by TL with the
variation of UV doses (5–20 min). Sample shows a well-resolved
peak at
${{117}}\
^{\circ}{{C}}$
, and corresponding TL intensity
increases with increasing UV exposure time. The kinetic parameter
was calculated by peak shape method using CGCD technique. PL spectra
of prepared phosphor show the variation with cerium concentration
and it shows well resolved peak at 455 nm excited with 390 nm xenon
lamp. The PL spectrum is due to transition of cerium ion in host matrix.
PL intensity increases with increasing the concentration of cerium
and it maximum for 2 mol% of
${{Ce}}^{3+}$
ion, after that
PL intensity decreases, it is due to concentration quenching. Spectrophotometric
determinations of peaks are evaluated by Commission Internationale
de I’Eclairage (CIE) technique. The prepared phosphor is useful
for display devices applications for blue emission.
© 2015 IEEE
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