Abstract
A series of Eu3+-doped phosphors Ca9(1−x)ZnK(PO4)7: 9xEu3+ (x=0 – 0.08) have been synthesized by the high temperature solid state method. The X-ray diffraction (XRD) and photoluminescence (PL) were utilized to characterize the phosphors. The phosphors can be effectively excited by near-ultraviolet (NUV) light. The Ca9ZnK(PO4)7 host exhibits broad blue emission band centered at 440nm, while Ca9ZnK(PO4)7: Eu3+ shows both the blue emission band and the characteristic red emission in the region of 570 – 700nm. With increasing Eu3+ content, the relative emission intensity of the host at 440nm decreased remarkably, indicating that energy transfer occurred from the Ca9ZnK(PO4)7 host to Eu3+ ions. The phosphors show tunable color from blue to orange based on energy transfer from the host to Eu3+ ions.
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