Luminescent properties of Eu3+ in calcium hydroxyapatite

Dependence of Eu3+ luminescence dynamics on the structure of the combustion synthesized Sr5(PO4)3F host

“…Owing to this nature, some thermodynamically permissible local lattice site rearrangement is possible which in turn affects the overall dopant distribution. This is in contrast to the previously reported Sr 5 (PO 4 ) 3 F:Eu and strontium apatite phosphors prepared via solid state and co-precipitation synthesis [10,11,13,14,24] where prominent presence of 5 D 0 → 7 F 0 transitions was observed. This kind of synthesis usually precedes slowly allowing different lattice site stabilization and distributions.…”

“…The origin of two contributions can be confirmed from the time resolved spectroscopy. According to several literature studies [12,14,24,25], Eu 3+ substitutes Sr 2+ ions and occupy mainly the S2 sites, with a relative abundance of 60% which makes 5 D 0 → 7 F 0 transition more intense compared to other transition of Eu 3+ . In our case observed 5 D 0 → 7 F 0 emission band at 578.7 nm is related to S1 sites, with a relative abundance of 40%.…”

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

“…When rare earth ions substitute Ca 2+ ions in calcium apatite, it is believed that Eu 3+ ions predominantly occupied Ca-II site [16,17]. For example, in the Eu 3+ -doped calcium hydroxyapatite [18], three distinct spectroscopic sites can be found for 5 D 0 → 7 F 0 transition. The first two sites are associated with the Eu 3+ in Ca-II sites and the other one is associated with Eu 3+ in Ca-I site.…”

Effects of crystalline growth on structural and luminescence properties of Ca(10−3x)Eu2x(PO4)6F2 nanoparticles fabricated by using a microwave driven hydrothermal process

“…The second mechanism can lead to substitution of two Ca(2) ions which belongs to the same triangle built from calcium ions or to different triangles known as cis-symmetry and transsymmetry arrangements of substituted Eu 3+ ions along the channel structures from these triangles. In the literature it is well-known that three lines for the 0-0 transition are present in apatite compounds 42,43 . Table 2).…”