Abstract
ABSTRACTSingle-phased white light emitting (Ca,Eu,Mn)9Al(PO4)7 phosphors were synthesized by conventional one-step reduction solid state reaction. The emission colors could be tuned from blue (0.170, 0.082) to white light (0.299, 0.316) and eventually to yellow (0.390, 0.400) through an efface energy transfer by controlling the dopant Eu2+/Mn2+ concentration. Energy transfer between the sensitizer Eu2+ and the activator Mn2+ has been studied and demonstrated to be a resonant type via a dipole-dipole interaction mechanism. Emissions from Eu2+ and Mn2+ in Ca9Al(PO4)7 exhibits excellent thermal stability and synchronicity. Finally, a white-LED with Ra = 79 was fabricated by using a 380 nm UV chip with single-phased (Ca0.965Eu0.005Mn0.03)Al(PO4)7 phosphor.
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