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

Abstract 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 3 mol% 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 613 nm dominates over that of magnetic dipole transition ( 5 D 0  →  7 F 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 9 Y 0.97 (PO 4 ) 7 :0.03Eu 3+ excited at 392 nm 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.