The influence of excitation wavelength on the emission of europium(III) ions in phosphate silicate hydroxyapatite
Abstract
Synthetic hydroxyapatite (HAp; Ca10(PO4)6(OH)2) exhibits exceptional bioactivity and biocompatibility rendering it highly valuable in medical applications such as bioimaging. The HAp crystallizes in a hexagonal structure (space group P63/m). Furthermore, within the HAp structure, two distinct cationic sites can be identified – non-center-symmetrical Ca(1) and non-equivalent Ca(2). Doping with Eu3+ exhibit enhanced capabilities compared to organic optical probes. Additionally, within the anionic site, phosphate ions may be substituted by silicate anions, SiO4 4- . This study focuses on examining the influence of excitation wavelength on the emission of Eu3+ ions at the Ca(1) and Ca(2) sites within the phosphate silicate hydroxyapatite matrix. We prepared a series of materials with incremental silicate content and another series with variations solely in annealing temperatures. To characterize the morphology and chemical structure of the obtained materials, we employed techniques such as X-ray Powder Diffraction (XRPD), Scanning Electron Microscopy-Energy-Dispersive Spectrometry (SEM-EDS), Fourier Transform Infrared (FT-IR) spectroscopy, and Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES). Our study delved into the spectroscopic properties, including emission, excitation, and emission kinetics.
Natalia Charczuk
Organising Committee Member
