Abstract
Y
$_{2.95}$
Al
$_{5}$
O
$_{12}{:}{{0.05Ce}}$
$^{3+}$
phosphors were synthesized via the solid-state reaction
method using fluxes of H
$_{3}$
BO
$_{3}$
and BaF
$_{2}$
. The
thermal stability and luminescence of Y
$_{2.95}$
Al
$_{5}$
O
$_{12}{:}{{0.05Ce}}$
$^{3+}$
prepared with 6 wt% BaF
$_{2}$
flux additive (Sample II) were
compared with those of Y
$_{2.95}$
Al
$_{5}$
O
$_{12}{:}{{0.05Ce}}$
$^{3+}$
prepared
with 7 wt% H
$_{3}$
BO
$_{3}$
flux additive (Sample I). The crystallinity of Sample I
was found to be better than that of Sample II. This difference in
crystallinity, which led to a difference in thermal stability, is
well explained by the presence of defects. Moreover, Sample I, Sample
II, and commercial Y
$_{3}$
Al
$_{5}$
O
$_{12}{:}{{Ce}}$
$^{3+}$
phosphors were coated onto 450-nm chips for the fabrication
of white light-emitting diodes (WLEDs). The luminous efficacy (@ 350
mA) of Sample-I-based (68.98 lm/W) and commercial-Y
$_{3}$
Al
$_{5}$
O
$_{12}{:}{{Ce}}$
$^{3+}$
-based (70.87 lm/W) WLEDs was lower than that (77.2 lm/W)
of the Sample-II-based WLED due to the powder morphology of the phosphors.
© 2015 IEEE
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