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Structural and spectroscopic analyses of europium doped yttrium oxyfluoride powders prepared by combustion synthesis
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10.1063/1.4816623
/content/aip/journal/jap/114/4/10.1063/1.4816623
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/4/10.1063/1.4816623

Figures

Image of FIG. 1.
FIG. 1.

SEM images for samples of yttrium oxyfluoride powders doped with 3 wt.% of Eu heat-treated at (a) 700 and (b) 800 °C. Full scale bar is 20 m.

Image of FIG. 2.
FIG. 2.

XRPD patterns of yttrium oxyfluoride powders doped with 3 wt.% of Eu and the Rietveld fittings for samples heat treated at (a) 700 °C and (b) 800 °C. The predominant crystalline phases are also shown with the diffraction peaks labeled by powder diffraction files as shown in Table I .

Image of FIG. 3.
FIG. 3.

3D crystal structure of vernier phase YOF.

Image of FIG. 4.
FIG. 4.

The cell volume estimated by Rietveld analysis as a function of Eu doping concentration for the predominant crystalline phase of samples prepared by combustion synthesis and heat treated at two different temperatures.

Image of FIG. 5.
FIG. 5.

Stokes luminescence spectra of samples heat treated at (a) 700 °C and (b) 800 °C. The “X” represents Eu doping concentration (wt.%). The excitation source was a UV lamp (255 nm).

Image of FIG. 6.
FIG. 6.

Stokes luminescence decay for samples heat treated at (a) 700 °C and (b) 800 °C. The “X” represents Eu doping concentration (wt.%). The excitation source was a pulsed laser (5 ns, 10 Hz) operating at λ = 410 nm.

Image of FIG. 7.
FIG. 7.

Nonradiative emission rate as a function of squared doping concentration of Eu. The values of the multiphonon emission rates taken from the best-fit of Eq. (4) with the experimental data are shown with errors between parentheses for samples prepared by combustion synthesis and heat treated at two different temperatures.

Tables

Generic image for table
Table I.

Rietveld refinement results for yttrium oxyfluoride powders prepared by combustion synthesis and heat treated at two different temperatures. First column: the numbers between parentheses represent wt.% of europium.

Generic image for table
Table II.

Luminescence asymmetry ratio (AR), Judd-Ofelt intensity parameters (Ω and Ω), radiative (A) and nonradiative (A) decay rates, luminescence lifetime (τ), and LQE for yttrium oxyfluoride samples prepared by combustion synthesis and heat treated at two different temperatures.

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/content/aip/journal/jap/114/4/10.1063/1.4816623
2013-07-26
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural and spectroscopic analyses of europium doped yttrium oxyfluoride powders prepared by combustion synthesis
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/4/10.1063/1.4816623
10.1063/1.4816623
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