Abstract
Fluoro-apatite M5(PO4)3F (M = Ca, Sr, Ba) phosphorsactivated with Ce3+ ions were prepared by a solid state reaction technique at high temperature. The excitationspectra in the VUV (vacuum ultraviolet)–UV range and the emission spectra in theUV–vis range together with decay time spectra are investigated and discussed.X-ray excited emission spectra were measured and light yields are calculated.The results revealed that Ca(II) sites are preferentially occupied at low dopingconcentration, and then Ca(I) sites are dominant with the increasing of concentration forCe3+ inCa5(PO4)3F. Incontrast, Ce3+ ions mainly occupied the Sr(II)/Ba(II) sites inSr5(PO4)3F and Ba5(PO4)3F even at higher doping concentration. The low light output seems to suggest that thematerials are not suitable x-ray or gamma-ray phosphors.
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