Effects of Ag⁺ Ion Doping on UV Radiation Absorption and Luminescence Profiles of Fluorapatite Nanomaterials Obtained by Neutralization Method

Abstract

In the present study we have analyzed effects of Ag + ions doping on energetic profiles of nanophosphors materials based on fluorapatite crystal system. The UV radiation absorption and luminescence properties of monophase fluorapatite (FAP) and Ag + doped fluorapatite (AgFAP) nanomaterials obtained by neutralization method were investigated using the photoluminescence spectrophotometry. The excitation-emission profiles of nanomaterials were analyzed statistically by MCR-ALS method and number of fluorophores was extracted. FAP lattice absorbed light at 350 nm in the UVA part of spectrum, and with increasing concentration of Ag + ions new absorption maximum appeared at 270 nm in the UVC part. Fluorescence of FAP nanoparticles was in violet region of visible part of the spectrum, with a red shift to the green region when Ag + was doped in lattice. MCR-ALS analyses of fluorescence spectra confirm formation of two maxima, at 484 and 505 nm, as a consequence of Ag + ions doping in FAP lattice at Ca1 (4f) sites. The results of quantum chemical calculations showed that an Ag + ion is stronger bonded to the binding site 1 (−1352.6 kcal/mol) than to the binding site 2 (−1249.0 kcal/mol). Considering that AgFAP1 nanopowder absorbs photons over all part of UV radiation spectrum, this material might be used as potential radiation protective nanomaterial.

Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation

“…In this substitution, one ion is replaced by another with the same sign but with a different charge; the neutrality is preserved by replacing the ions of the opposite charge or by forming vacancies. The addition of various dopants in FAP has attracted increasing attention in the last few decades for developing suitable luminescent materials for various application areas such as bone and teeth tissue reparation, bioimaging contrast agents, antimicrobial nanomaterials, as well as photoactive catalysts [7][8][9][10][11].…”