Abstract
${{Bi}}^{3+}$
and
${{Eu}}^{3+}$
ions co-activated
${{Ca}}_{9} {{Y}}({{PO}}_{4})_{7}$
phosphors were prepared by solid-state reaction. The crystal
structure, luminescence properties, and morphology of these phosphors
were studied. X-ray diffraction results showed that when the calcination
temperature was 1100
$^{\circ}{{C}}$
, the phosphates could obtain
their own pure phase. Scanning electron microscopy images exhibited
that the average particle diameter of the phosphors was approximately
5–8
$\mu{{m}}$
. The phosphors could be excited by near-UV light at 397
nm, which agrees with the current UV chip, and with red light emission
at 617 nm. The co-doped
${{Bi}}^{3+}$
ions demonstrated
efficient energy transfer to
${{Eu}}^{3+}$
ions, and the emission
intensity of
${{Bi}}^{3+}$
and
${{Eu}}^{3+}$
co-doped samples were approximately two times as high as
that of
${{Eu}}^{3+}$
singly doped samples. The CIE value (0.64, 0.34) of
${{Ca}}_{9} {{Y}}
_{0.92}({{PO}}_{4})_{7}$
:
${{Bi}}^{3+} _{0.01}$
,
${{Eu}}^{3+}
_{0.07}$
was close to the standard red color coordinates.
All results indicated that the red phosphors could be potentially
applied to white light-emitting diodes.
© 2015 IEEE
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