Abstract
4SrO·7Al 2O 3 long persistent ceramics with different B 2O 3 contents prepared by sintering were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence spectrum (PLS). The ceramics showed a two peak emission at 400 and 486 nm, due to the different lattice sites Eu 2+ ions held in the 4SrO·7Al 2O 3 lattice. B 2O 3 plays several different roles in the ceramics. In the synthesis process, it greatly promotes the formation of 4SrO·7Al 2O 3 phosphor and helps to form dense ceramics at 1400 °C. Furthermore, with the addition of B 2O 3, the emission peaks shifted to the short wavelength side due to lattice contraction. The afterglow characteristics result from the emission at 486 nm other than the emission at 400 nm. The duration of the phosphor was enhanced by the addition of B 2O 3, due to the trap center formed in the 4SrO·7Al 2O 3 host.
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