Photoluminescence of Europium-Activated Hydroxyapatite Nanoparticles in Body Fluids
Hydroxyapatite (Ca10(PO4)6(OH)2, HA) nanoparticles activated with Eu3+ were synthesized using the sol–gel technique. The crystal structure was elucidated by X-ray diffraction analysis and the internal crystal structure and morphology was studied by transmission electron microscopy. Under excitation with 394 nm light, the powders are red-emitting. The photoluminescence bands are detected at 575 nm (5D0 → 7F0), ∼590 nm (5D0 → 7F1), 613 nm (5D0 → 7F2) and 626 nm (5D0 → 7F2). The nanosized HA:Eu dispersed in urine and blood serum showed high stability with respect to their optical properties, although some transitions underwent a change in relative emission intensities. A change in emission intensities was also observed for the cysteine dispersion. The stability at different pHs was studied in water and body fluids. The HA:Eu nanoparticles are suitable as biomarkers for nanomedical applications.
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Document Type: Research Article
Publication date: May 1, 2012
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