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A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles
dc.contributor.author | Machado, Thales Rafael | |
dc.contributor.author | Sczancoski, Júlio César | |
dc.contributor.author | Beltrán Mir, Héctor | |
dc.contributor.author | Costa Nogueira, Içamira | |
dc.contributor.author | Siu Li, Maximo | |
dc.contributor.author | Andres, Juan | |
dc.contributor.author | Cordoncillo, Eloisa | |
dc.contributor.author | Longo, Elson | |
dc.date.accessioned | 2017-03-28T08:29:08Z | |
dc.date.available | 2017-03-28T08:29:08Z | |
dc.date.issued | 2017-05 | |
dc.identifier.citation | 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. 64–69 | ca_CA |
dc.identifier.uri | http://hdl.handle.net/10234/166963 | |
dc.description.abstract | 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. | ca_CA |
dc.description.sponsorShip | The authors are grateful to the FAPESP (#2013/11144-3), FAPESP/CEPID (#2013/07296-2), CNPq (#573636/2008-7), CAPES/PNPD (#20131475), Universitat Jaume I (P1 1B2013-65), and Ministerio de Economia y Competitividad (Salvador Madariaga program, PRX155/00261) for the financial support. Special thanks to Mr. R. Camargo for FE-SEM and TEM images. | ca_CA |
dc.format.extent | 5 p. | ca_CA |
dc.format.mimetype | application/pdf | ca_CA |
dc.language.iso | eng | ca_CA |
dc.publisher | Elsevier | ca_CA |
dc.relation.isPartOf | Journal of Solid State Chemistry Volume 249, May 2017 | ca_CA |
dc.rights | © 2016 Elsevier Inc. All rights reserved. | ca_CA |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | * |
dc.subject | Hydroxyapatite | ca_CA |
dc.subject | Chemical precipitation | ca_CA |
dc.subject | Photoluminescence | ca_CA |
dc.subject | Electronic structure | ca_CA |
dc.subject | Defects | ca_CA |
dc.subject | Order-disorder | ca_CA |
dc.title | A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles | ca_CA |
dc.type | info:eu-repo/semantics/article | ca_CA |
dc.identifier.doi | http://dx.doi.org/10.1016/j.jssc.2016.12.018 | |
dc.rights.accessRights | info:eu-repo/semantics/restrictedAccess | ca_CA |
dc.relation.publisherVersion | http://www.sciencedirect.com/science/article/pii/S0022459616304947 | ca_CA |
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