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Photoluminescence of Europium-Activated Hydroxyapatite Nanoparticles in Body Fluids

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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 (5D07F0), ∼590 nm (5D07F1), 613 nm (5D07F2) and 626 nm (5D07F2). 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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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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