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Luminescence variations in hydroxyapatites doped with Eu2+ and Eu3+ ions

Paper ID Volume ID Publish Year Pages File Format Full-Text
8431 590 2010 9 PDF Available
Title
Luminescence variations in hydroxyapatites doped with Eu2+ and Eu3+ ions
Abstract

We present a detailed analysis of the luminescence behavior of europium-doped hydroxyapatite (HAp) and calcium-deficient hydroxyapatite (Ca-D HAp) nanopowders. The results show that, while both powders are similar in crystallite size, particle size, and morphology, the luminescence behavior differs significantly. For the HAp:Eu powders, the emission is clearly from Eu3+ ions and corresponds to typical 5D0 → 7FJ emissions, whereas for the Ca-D HAp:Eu powders, we also see a broad emission with two peaks at 420 and 445 nm, corresponding to the 4f65d1 → 4f7 (8S7/2) transition of Eu2+. The powders are weakly luminescent in the as-synthesized state, as expected for combustion-synthesized materials and have higher emission intensities as the heat treatment temperature is increased. Luminescence spectra obtained using an excitation wavelength of 254 nm are weak for all samples. Excitation wavelengths of 305, 337, and 359 nm, are better at promoting the Eu3+ and Eu2+ emissions in hydroxyapatites. We propose that fluorescence measurements are an excellent way of qualitatively determining the phase composition of europium-doped hydroxyapatite powders, since powders that exhibit a blue emission contain substantial amounts of Ca-D HAp, allowing the determination of the presence of this phase in mixed-phase hydroxyapatites.

Keywords
Fluorescence; Hydroxyapatite nanoparticles; Particle size distribution; Dynamic light scattering; Charge compensation; Combustion synthesis
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Luminescence variations in hydroxyapatites doped with Eu2+ and Eu3+ ions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 31, Issue 15, May 2010, Pages 4259–4267
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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