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Luminescence and crystallographic sites for Eu3+ ions in Sr5(PO4)3F phosphor

Journal of Alloys and Compounds
DOI: 10.1016/j.jallcom.2014.06.164
  • Eu3+
  • Luminescence
  • Sr5(Po4)3F
  • Site Occupation
  • Phosphor


Abstract This paper reports on the fluorescence studies of Eu3+-doped strontium fluoroapatite. The goal of this paper is to establish and characterize the possible sites for Eu3+ substitution in Sr5(PO4)3F lattice. Eu3+-doped Sr5(PO4)3F phosphor was prepared by the solid state reaction method. The X-ray powder diffraction result of as-synthesized powder phosphor revealed the single phase Sr5(PO4)3F and it also indicated that the incorporation of Eu3+ ions did not affect the crystal structure. Photoluminescence (PL) studies of Eu3+-doped Sr5(PO4)3F phosphor were performed to study spectral properties of the sample. Site-selective excitation and emission spectra together with the decay curves were investigated by site-selective laser-excitation spectroscopy. The three crystallographic sites for Eu3+ ions were identified in the 7F0→5D0 excitation spectra by using a pulsed, tunable, and narrowband dye laser. The luminescence due to the 5D0→7FJ (J=1, 2) transitions under excitation at each crystallographic site exhibited its own spectral features. Three crystallographic sites in Sr5(PO4)3F give rise to different crystal-field splits of the 7F1 and 7F2 multiplets. Heterovalent substitution by rare-earth ions (Eu3+) for Ca2+ positions in the hexagonal crystal lattice requires some form of charge compensation. The charge-compensation mechanism, site symmetry, and the crystal-field strength on Eu3+ sites in the Sr5(PO4)3F were discussed for better understanding of preference for substitution of Eu3+ in Sr5(PO4)3F lattice.

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