Quenching of the Eu 3+ Luminescence by Cu 2+ Ions in the Nanosized Hydroxyapatite Designed for Future Bio-Detection.
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| Title: | Quenching of the Eu 3+ Luminescence by Cu 2+ Ions in the Nanosized Hydroxyapatite Designed for Future Bio-Detection. |
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| Authors: | Szyszka, Katarzyna1 (AUTHOR) k.szyszka@intibs.pl, Targońska, Sara1 (AUTHOR) a.watras@intibs.pl, Lewińska, Agnieszka2 (AUTHOR) agnieszka.lewinska@chem.uni.wroc.pl, Watras, Adam1 (AUTHOR), Wiglusz, Rafal J.1,3 (AUTHOR) k.szyszka@intibs.pl, Chen, Jiangshan (AUTHOR) |
| Source: | Nanomaterials (2079-4991). Feb2021, Vol. 11 Issue 2, p464-464. 1p. |
| Subjects: | Luminescence, Electron microscope techniques, Electron paramagnetic resonance, X-ray powder diffraction, Luminescence quenching, Hydroxyapatite, Electron paramagnetic resonance spectroscopy |
| Abstract: | The hydroxyapatite nanopowders of the Eu3+-doped, Cu2+-doped, and Eu3+/Cu2+-co-doped Ca10(PO4)6(OH)2 were prepared by a microwave-assisted hydrothermal method. The structural and morphological properties of the products were investigated by X-ray powder diffraction (XRD), transmission electron microscopy techniques (TEM), and infrared spectroscopy (FT-IR). The average crystal size and the unit cell parameters were calculated by a Rietveld refinement tool. The absorption, emission excitation, emission, and luminescence decay time were recorded and studied in detail. The 5D0 → 7F2 transition is the most intense transition. The Eu3+ ions occupied two independent crystallographic sites in these materials exhibited in emission spectra: one Ca(1) site with C3 symmetry and one Ca(2) sites with Cs symmetry. The Eu3+ emission is strongly quenched by Cu2+ ions, and the luminescence decay time is much shorter in the case of Eu3+/Cu2+ co-doped materials than in Eu3+-doped materials. The luminescence quenching mechanism as well as the schematic energy level diagram showing the Eu3+ emission quenching mechanism using Cu2+ ions are proposed. The electron paramagnetic resonance (EPR) technique revealed the existence of at least two different coordination environments for copper(II) ion. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The hydroxyapatite nanopowders of the Eu3+-doped, Cu2+-doped, and Eu3+/Cu2+-co-doped Ca10(PO4)6(OH)2 were prepared by a microwave-assisted hydrothermal method. The structural and morphological properties of the products were investigated by X-ray powder diffraction (XRD), transmission electron microscopy techniques (TEM), and infrared spectroscopy (FT-IR). The average crystal size and the unit cell parameters were calculated by a Rietveld refinement tool. The absorption, emission excitation, emission, and luminescence decay time were recorded and studied in detail. The 5D0 → 7F2 transition is the most intense transition. The Eu3+ ions occupied two independent crystallographic sites in these materials exhibited in emission spectra: one Ca(1) site with C3 symmetry and one Ca(2) sites with Cs symmetry. The Eu3+ emission is strongly quenched by Cu2+ ions, and the luminescence decay time is much shorter in the case of Eu3+/Cu2+ co-doped materials than in Eu3+-doped materials. The luminescence quenching mechanism as well as the schematic energy level diagram showing the Eu3+ emission quenching mechanism using Cu2+ ions are proposed. The electron paramagnetic resonance (EPR) technique revealed the existence of at least two different coordination environments for copper(II) ion. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20794991 |
| DOI: | 10.3390/nano11020464 |
