Abstract
Ce3+ and Ce3+/Tb3+-activated Sr3NaY(PO4)3F phosphors are synthesized by the high temperature solid-state reaction, which can be efficiently excited by near ultraviolet (NUV) light-emitting diode (LED) chips. The X-ray diffraction profiles (XRD), photoluminescence(PL) spectra, the decay curves, thermal properties and energy transfer of the phosphors were systematically investigated in detail. The PL spectrum of Sr3NaY(PO4)3F:Ce3+/Tb3+ shows a broad hump ranging from 300 to 450 nm of Ce3+ ions and characteristic line of Tb3+ ions. The emission intensity of Tb3+ increased and that of Ce3+ decreased with the increase of content of Tb3+. The color of the Sr3NaY(PO4)3F:Ce3+/Tb3+ phosphors can shift from blue to green by varying Tb3+ content. The decay curves of Sr3NaY(PO4)3F:Ce3+/Tb3+ indicated that energy transfer process from Ce3+ to Tb3+ existed in the host and the quadrupole–quadrupole interaction to be demonstrated for energy transfer mechanism. In addition, the Sr3NaY(PO4)3F:Ce3+/Tb3+ phosphor exhibits excellent thermal stability, 90% initial emission intensity still remained at temperatures over 100 °C. The obtained results reveal that Sr3NaY(PO4)3F:Ce3+/Tb3+ phosphors can be served as a green-emitting candidate material for phosphor-converted white-light NUV-LEDs.
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