title: A red-emitting Ca8MgLa(PO4)7:Ce3+,Mn2+ phosphor for UV-based white LEDs application.
abstract: Ca(8)MgLa(PO(4))(7):Ce(3+),Mn(2+) phosphors have been prepared by a conventional solid state reaction under a weak reductive atmosphere. The crystal structure and photoluminescent properties were investigated. It was found that the red emission at 640nm originated from the (4)T(1)((4)G)→(6)A(1)((6)S) transition of Mn(2+) increases dramatically by a factor of 6.4 with the optimum Ce(3+) co-doping. The energy transfer from Ce(3+) to Mn(2+) was proposed to be resonance-type via an electric dipole-dipole mechanism and the energy transfer efficiency was also calculated by the relative emission intensity. With the broadband ultraviolet (UV) absorption of Ce(3+) and the suitable color coordinates, Ca(8)MgLa(PO(4))(7):Ce(3+),Mn(2+) phosphors might be a promising candidate as red phosphors in the field of UV-based white light-emitting diodes.
authors.affiliation: MOE Key Lab of Specially Functional Materials, Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, PR China.
authors.forename: Y N
authors.initials: YN
authors.lastname: Xue
authors.forename: F
authors.initials: F
authors.lastname: Xiao
authors.forename: Q Y
authors.initials: QY
authors.lastname: Zhang
mesh_terms: D002118:Calcium / Q000737:chemistry*; D002586:Cesium / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D007811:Lanthanum / Q000737:chemistry; D008029:Lighting / Q000295:instrumentation*; D049449:Luminescence; D008274:Magnesium / Q000737:chemistry; D008345:Manganese / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000737:chemistry*; D013057:Spectrum Analysis; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
chemical_list: D010710:Phosphates; D002586:Cesium; D008345:Manganese; D007811:Lanthanum; D003300:Copper; D008274:Magnesium; D002118:Calcium