Crystal phases, photoluminescence, and long-afterglow luminescence of SrAl2O4: Eu2+, Dy3+ - xB(2)O(3) (0 a parts per thousand currency sign x a parts per thousand currency sign 0.4) phosphors

摘要

SrAl2O4: 0.04Eu(2+), 0.08Dy(3+) - xB(2)O(3) (0 a parts per thousand currency sign x a parts per thousand currency sign 0.4) phosphors were synthesized by using the conventional solid-state reaction route. The long-afterglow (LAG) luminescence increased notably up to x = 0.3, followed by a slight decrease at x = 0.4. A good correlation between the LAG luminescence and the total quantity of the luminescent crystalline phases (SrAl2O4 and Sr4Al14O25) was found, based on the Rietveld refinement of the X-ray diffraction pattern. However, through a comparison of the PL excitation/emission with the LAG luminescence, we concluded that the maximal LAG luminescence was not only governed by the quantity of the luminescent host but also by the quality of the host (the concentration of the doped Eu2+ and especially the Dy3+ in the luminescent phases).