Abstract
Ca 8MgLa(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 640 nm originated from the 4T 1( 4G) → 6A 1( 6S) 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 8MgLa(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.
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