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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles

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Machado, Thales R. ; Sczancoski, Julio C. ; Beltran-Mir, Hector ; Nogueira, Icamira C. ; Li, Maximo S. ; Andres, Juan ; Cordoncillo, Eloisa ; Longo, Elson
Total Authors: 8
Document type: Journal article
Source: Journal of Solid State Chemistry; v. 249, p. 64-69, MAY 2017.
Web of Science Citations: 4

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 {[}Ca-10(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 degrees C followed by distinct heat treatments temperatures (200-800 degrees C). Intense and broad emission profiles were achieved at 350 degrees C (380-750 nm) and 400 degrees C (380-800 nm). UV-Vis spectroscopy revealed band gap energies (5.58-5.78 eV) higher than the excitation energies (similar to 3.54 and similar to 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. (AU)

FAPESP's process: 13/11144-3 - Study, Characterization and Properties of Multifunctional Orthophosphates
Grantee:Thales Rafael Machado
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC