UV-excited red-emitting phosphor Eu3+-activated Ca9Y(PO4)7.

Red-emitting phosphor Ca(9)Y(PO(4))(7):Eu(3+) were fabricated by solid-state reactions at high temperature. X-ray diffraction analysis revealed that Ca(9)Y(PO(4))(7) doped with 3mol% of Eu(3+) (Ca(9)Y(0.97)(PO(4))(7):0.03Eu(3+)) was pure orthorhombic phase. The photoluminescence study shows that the intensity of electric dipole transition ((5)D(0)→(7)F(2)) at 613nm dominates over that of magnetic dipole transition ((5)D(0)→(7)F(1)) at 594nm. The optimum concentration of Eu(3+) for the highest luminescence is found to be 3mol%. The PL excitation spectrum is composed of CT of Eu-O and excitation lines of Eu(3+) ions. The strongest excitation lines appeared at 392nm. The integral intensity of the emission spectrum of Ca(9)Y(0.97)(PO(4))(7):0.03Eu(3+) excited at 392nm is about twice as strong as that of Y(2)O(3):0.05Eu(3+) commercial red phosphor. The color coordinates, quantum yield and lifetime for Ca(9)Y(0.97)(PO(4))(7):0.03Eu(3+) were measured. All the spectrum features indicate that Ca(9)Y(PO(4))(7):Eu(3+) might be a promising phosphor for display devices or w-LEDs.