MOE Key Lab of Specially Functional Materials, Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 May;78(5):1445-8. doi: 10.1016/j.saa.2011.01.025. Epub 2011 Jan 26.
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.
采用弱还原气氛下的传统固相反应法制备了 Ca(8)MgLa(PO(4))(7):Ce(3+),Mn(2+) 荧光粉。研究了其晶体结构和发光性能。结果表明，Ce(3+)最佳共掺杂时，Mn(2+)的 640nm 处红光发射源于(4)T(1)((4)G)→(6)A(1)((6)S)跃迁，强度增大了 6.4 倍。Ce(3+)到 Mn(2+)的能量传递被认为是通过电偶极-偶极机制的共振类型，并且通过相对发射强度计算了能量传递效率。由于 Ce(3+)具有宽的紫外 (UV) 吸收和合适的色坐标，Ca(8)MgLa(PO(4))(7):Ce(3+),Mn(2+) 荧光粉可能是 UV 基白光发光二极管中红色荧光粉的有前途的候选材料。
