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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