Abstract
The structural and luminescent properties of Ca2Y8(SiO4)6O2 (CYS) silicate based oxyapatite doped with Eu3+ ions have been reported in this paper. The sample was synthesized using reflux method assisted by urea subsequent degradation. Very specific, sh?lland rope-like morphologies were observed by SEM. The powder X-ray diffraction study revealed that the Eu3+: CYS system crystallized in a hexagonal lattice structure (space group P63/m) characteristic of oxyapatite. In the host oxyapatite structure, ? partial replacement of Ca2+ ?nd Y3+ ions by luminescent active Eu3+ ions have been done, and its photoluminescent spectra were analyzed. The performed analysis indicate the presence of Eu3+ ions in both, nine-fold coordinated 4f, and seven-fold coordinated 6h sites, showing a slight shift towards the blue area in comparison to a typical spectra of other yttrium-silicate phases as hosts.
Highlights
Luminescent materials have attracted great attention because of their potential application in high-resolution devices such as: cathode ray tubes (CRTs), flat panel display devices, or field emission displays (FEDs) [1, 2]
The most prominent structural characteristic of oxyapatites is the possibility of rare earth ions to simultaneously occupy two different crystallographic sites, the nine-fold coordinated 4f site and the seven-fold coordinated 6h site in the hexagonal lattice structure
As Ca2Y8(SiO4)6O2 is isostructural with natural oxyapatite phase Ca10(PO4)6F2, all reflections were indexed in the space group (S.G.) P63/m, as follow: 22.1° (200), 23.3° (111), 26.3° (002), 28.7° (120), 29.2° (102), 32.2° (121), 32.8° (112), 33.3° (300), 47.4° (222), 48.8° (213), 50.3° (123), 51.9° (402), and 52.6° (004)
Summary
Luminescent materials have attracted great attention because of their potential application in high-resolution devices such as: cathode ray tubes (CRTs), flat panel display devices, or field emission displays (FEDs) [1, 2]. The sol–gel method became one of the most attractive methods for synthesis of various luminescent ceramics composed of different host materials in which rare earth metal ions have been incorporated, e.g. Y2SiO5:Tb and Y3Al5O12:Tb systems for cathodoluminescence, Y3Al5O12:Eu and Y3(Al, Ga)5O12:Tb for field emission displays, Y2O3:Eu, TiO2:Eu and Zn2SiO4:Mn/Tb for photoluminescence, and ZnS:Mn/Tb and Ga2O3:Eu/Mn for electroluminescence [3,4,5]. A special attention among the host materials belongs to the Ca2RE8(SiO4)6O2 (RE is Y, Gd or La) oxyapatite, which can be used to host various luminescence active rare earth ions [7,8,9,10,11,12]. System, obtained by urea assisted sol-gel method, have been studied.
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