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

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 [Ca{sub 10}(PO{sub 4}){sub 6}(OH){sub 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. - Graphical abstract: The self-activated photoluminescence emissions of chemically precipitated hydroxyapatite nanorods were improved by different heat treatment temperatures. - Highlights: • HA nanorods were synthesized withmore » improved self-activated PL at room temperature. • PL profile and intensity dependents on the temperature of posterior heat treatments. • Bluish- and yellowish-white emissions under NUV excitation (350 and 415 nm). • Broad and intense profiles achieved at 350 °C (380–750 nm) and 400 °C (380–800 nm). • PL from the e′–h{sup •} recombination between defect energy levels within the band gap.« less

Authors:
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [3];  [1]
  1. CDMF-UFSCar, Universidade Federal de São Carlos, P.O. Box 676, 13565-905 São Carlos, São Paulo (Brazil)
  2. (Spain)
  3. QIO-UJI, Universitat Jaume I, 12071 Castellón (Spain)
  4. PPGEM-IFMA, Instituto Federal de Educação, Ciência e Tecnologia do Maranhão, 65030-005 São Luís, MA (Brazil)
  5. IFSC-USP, Universidade de São Paulo, P.O. Box 369, 13560-970 São Carlos, SP (Brazil)
  6. QFA-UJI, Universitat Jaume I, 12071 Castellón (Spain)
Publication Date:
OSTI Identifier:
22658262
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 249; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; APATITES; CHEMICAL REACTIONS; CRYSTAL DEFECTS; ELECTRONIC STRUCTURE; EXCITATION; EXPERIMENTAL DATA; FOURIER TRANSFORM SPECTROMETERS; FOURIER TRANSFORMATION; HEAT TREATMENTS; NANOPARTICLES; NANOSTRUCTURES; PHOTOLUMINESCENCE; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION

Citation Formats

Machado, Thales R., QIO-UJI, Universitat Jaume I, 12071 Castellón, Sczancoski, Júlio C., Beltrán-Mir, Héctor, Nogueira, Içamira C., Li, Máximo S., Andrés, Juan, Cordoncillo, Eloisa, and Longo, Elson, E-mail: elson.liec@gmail.com. A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles. United States: N. p., 2017. Web. doi:10.1016/J.JSSC.2016.12.018.
Machado, Thales R., QIO-UJI, Universitat Jaume I, 12071 Castellón, Sczancoski, Júlio C., Beltrán-Mir, Héctor, Nogueira, Içamira C., Li, Máximo S., Andrés, Juan, Cordoncillo, Eloisa, & Longo, Elson, E-mail: elson.liec@gmail.com. A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles. United States. doi:10.1016/J.JSSC.2016.12.018.
Machado, Thales R., QIO-UJI, Universitat Jaume I, 12071 Castellón, Sczancoski, Júlio C., Beltrán-Mir, Héctor, Nogueira, Içamira C., Li, Máximo S., Andrés, Juan, Cordoncillo, Eloisa, and Longo, Elson, E-mail: elson.liec@gmail.com. Mon . "A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles". United States. doi:10.1016/J.JSSC.2016.12.018.
@article{osti_22658262,
title = {A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles},
author = {Machado, Thales R. and QIO-UJI, Universitat Jaume I, 12071 Castellón and Sczancoski, Júlio C. and Beltrán-Mir, Héctor and Nogueira, Içamira C. and Li, Máximo S. and Andrés, Juan and Cordoncillo, Eloisa and Longo, Elson, E-mail: elson.liec@gmail.com},
abstractNote = {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{sub 10}(PO{sub 4}){sub 6}(OH){sub 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. - Graphical abstract: The self-activated photoluminescence emissions of chemically precipitated hydroxyapatite nanorods were improved by different heat treatment temperatures. - Highlights: • HA nanorods were synthesized with improved self-activated PL at room temperature. • PL profile and intensity dependents on the temperature of posterior heat treatments. • Bluish- and yellowish-white emissions under NUV excitation (350 and 415 nm). • Broad and intense profiles achieved at 350 °C (380–750 nm) and 400 °C (380–800 nm). • PL from the e′–h{sup •} recombination between defect energy levels within the band gap.},
doi = {10.1016/J.JSSC.2016.12.018},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 249,
place = {United States},
year = {Mon May 15 00:00:00 EDT 2017},
month = {Mon May 15 00:00:00 EDT 2017}
}