Luminescence properties of Ce3+ and Eu2+ in fluorites and apatites

Abstract

Abstract. Natural samples of fluorite and apatite from granites, pegmatites, carbonatites and andesitic tuffs were investigated by steady-time spectroscopy to characterize the luminescence properties of Ce 3+ and Eu 2+ . The luminescence of Ce 3+ has been clearly seen in fluorite as 320 and 337 or 343 nm bands. In apatites, two distinct bands for two different Ca crystal sites were obtained: 340-380 nm for Ca(1) and 420-450 nm for Ca(2). The luminescence spectra of Eu 2+ in the fluorite crystals were measured even at for low concentration of this element (0.11 ppm). For Ce 3+ , it has been showed that the crystal field strength depends more on the nature of the ligand than on the Me-ligand distances.

The luminescence properties of rare-earth ions in natural fluorite

“…ion of the studied fluorite was very similar to those which were known from Aierken et al (2000) or Bodył (2009 ) is one of the most efficient RE centers in minerals, and its characteristic spin-allowed transitions in NIR range are ] and in Cs 2 NaNd 0.01 Y 0.99 Cl 6 crystals (Tofield and Weber 1974) and it amounted to 1.23 and 4.1 ms, respectively. This means that Nd 3?…”

“…(Weber and Bierig 1964). There has been a large number of research papers on the luminescence of natural fluorite measured by the steady-state method (Illiev et al 1988;Aierken et al 2000Aierken et al , 2003Bodył 2006;Petit et al 2007;Czaja et al 2008;Bodył 2009) or the time-resolved method (Gaft et al 1998(Gaft et al , 2001a(Gaft et al , b, 2005(Gaft et al , 2008. Moreover, the synthetic CaF 2 , BaF 2 and SrF 2 crystals doped with RE ions were investigated intensively (Wood and Kaiser 1962;Kirilyuk 1973;Fenn et al 1973;Tallant and Wright 1975;Seelbinder and Wright 1979;Chrysochoos et al 1982Chrysochoos et al , 1983Illiev et al 1988;Caldino et al 1989;Oskam et al 2002).…”

Steady-state luminescence measurement for qualitative identification of rare earth ions in minerals

“…The luminescence spectra of Ce 3+ ions in studied minerals were very similar to those shown by Sidike et al (2000) or Bodył (2009). For λ exc = 295 nm and 311 nm, the intense band at 336 nm was measured and assigned to the transition from 5d(E g ) → 4f( ) is one of the most efficient REE centers in minerals (Gaft et al, 2005), and its characteristic spin -allowed transitions in the NIR range are (Gaft et al, 1995(Gaft et al, , 2005.…”

“…, but for apatite crystals, ΔS was from 4.7 × 10 3 cm −1 to 9.4 × 10 3 cm −1 (Bodył, 2009). As we have already observed (Bodył, 2009) …”

Luminescence properties of Eu2+ and Eu3+ doped calcium-deficient hydroxyapatite prepared in air

“…In the Eu 3+ -doped apatite, the Ca-I site should be weakly occupied because of the long distance between the Eu 3+ and O 2− [22]. The distance is retained when the Ca 2+ ion is substituted by Eu 3+ and the intensity of the charge transfer band (CT band) should be higher [23].…”