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