A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles
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Otros documentos de la autoría: Machado, Thales Rafael; Sczancoski, Júlio César; Beltrán Mir, Héctor; Costa Nogueira, Içamira; Siu Li, Maximo; Andres, Juan; Cordoncillo, Eloisa; Longo, Elson
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http://dx.doi.org/10.1016/j.jssc.2016.12.018 |
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Título
A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticlesAutoría
Fecha de publicación
2017-05Editor
ElsevierCita bibliográfica
MACHADO, Thales R., et al. A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles. Journal of Solid State Chemistry, vol. 249, 2017, pp. 64–69Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://www.sciencedirect.com/science/article/pii/S0022459616304947Palabras clave / Materias
Resumen
Defect-related photoluminescence (PL) in materials have attracted interest for applications including near ultraviolet (NUV) excitable light-emitting diodes and in biomedical field. In this paper, hydroxyapatite ... [+]
Defect-related photoluminescence (PL) in materials have attracted interest for applications including near ultraviolet (NUV) excitable light-emitting diodes and in biomedical field. In this paper, hydroxyapatite [Ca10(PO4)6(OH)2] nanorods with intense PL bands (bluish- and yellowish-white emissions) were obtained when excited under NUV radiation at room temperature. These nanoparticles were synthesized via chemical precipitation at 90 °C followed by distinct heat treatments temperatures (200–800 °C). Intense and broad emission profiles were achieved at 350 °C (380–750 nm) and 400 °C (380–800 nm). UV–Vis spectroscopy revealed band gap energies (5.58–5.78 eV) higher than the excitation energies (~3.54 and ~2.98 eV at 350 and 415 nm, respectively), confirming the contribution of defect energy levels within the forbidden zone for PL emissions. The structural features were characterized by X-ray diffraction, Rietveld refinement, thermogravimetric analysis, and Fourier transform infrared spectroscopy. By means of these techniques, the relation between structural order-disorder induced by defects, chemical reactions at both lattice and surface of the materials as well as the PL, without activator centers, was discussed in details. [-]
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Journal of Solid State Chemistry Volume 249, May 2017Derechos de acceso
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