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Optical properties and switching behavior in nanophosphor
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10.1063/1.3259370
/content/aip/journal/jap/106/9/10.1063/1.3259370
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/9/10.1063/1.3259370
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

FTIR spectra of samples (a) as-synthesized, (b) heat treated at 900 K for 6 h, and (c) heat treated at 1200 K for 6 h showing the reduction in the fluorescence quenching centers due to heat treatment.

Image of FIG. 2.
FIG. 2.

DTA and TGA curves of the doped phosphor.

Image of FIG. 3.
FIG. 3.

XRD patterns of doped nanocrystals: (a) as-synthesized, (b) heat treated at 900 K for 6 h, and (c) heat treated at 1200 K for 6 h.

Image of FIG. 4.
FIG. 4.

Transmission electron micrograph along with the selected area electron diffraction pattern of the doped phosphor sample annealed at 1200 K for 6 h.

Image of FIG. 5.
FIG. 5.

UC emission bands in the 300–500 nm region at a pump power of 50 mW for the as-synthesized phosphor material.

Image of FIG. 6.
FIG. 6.

Power dependence of the bands at 383, 411, 458, 491, and 672 nm wavelengths in the phosphor.

Image of FIG. 7.
FIG. 7.

Schematic energy level diagram of and possible UC and downconversion transitions and mechanisms involved in their appearance.

Image of FIG. 8.
FIG. 8.

Emission from the doped phosphor at a pump power of 600 mW showing a sharp decrease in the intensity of the bands at 383, 411, and 472 nm and an increase in the intensity of the bands at 458 and 491 nm.

Image of FIG. 9.
FIG. 9.

(a) Change in intensities of the bands with pump power and (b) graph showing the variation in the intensity of the band at 411 nm with increasing and decreasing pump powers.

Image of FIG. 10.
FIG. 10.

Partial energy level diagram of showing the mechanism of phonon absorption and emission at a high pump power.

Image of FIG. 11.
FIG. 11.

Continuum emission band in the 300–900 nm region on excitation with 532 nm at a 1.5 W pump power. The 490–580 nm region in the graph has been blocked by the filters in order to avoid a 532 nm excitation.

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/content/aip/journal/jap/106/9/10.1063/1.3259370
2009-11-12
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical properties and switching behavior in Gd2O3:Er3+ nanophosphor
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/9/10.1063/1.3259370
10.1063/1.3259370
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