title: 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 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.
authors.affiliation: College of Physics Science and Technology, Hebei University, Baoding 071002, China.
authors.forename: Qingbo
authors.initials: Q
authors.lastname: Liu
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Liu
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Yang
authors.forename: Xu
authors.initials: X
authors.lastname: Li
authors.forename: Yue
authors.initials: Y
authors.lastname: Han
mesh_terms: D002118:Calcium / Q000737:chemistry; D005063:Europium / Q000737:chemistry*; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D010758:Phosphorus / Q000737:chemistry*; D014466:Ultraviolet Rays; D015019:Yttrium / Q000737:chemistry
chemical_list: D049408:Luminescent Agents; D010758:Phosphorus; D005063:Europium; D015019:Yttrium; D002118:Calcium