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Probing dual mode emission of Eu3+ in garnet phosphor
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10.1063/1.4803053
/content/aip/journal/jap/113/17/10.1063/1.4803053
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803053
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Powder X-ray diffraction (XRD) patterns of (a) GdGaO calcined at 1200 °C for 2 h, (b) GdGaO calcined at 1300 °C for 2 h, and (c) Eu doped GdGaO, calcined at 1300 °C for 2 h.

Image of FIG. 2.
FIG. 2.

Observed (dots), calculated (continuous line), and difference (bottom line) profiles obtained after Le-Bail fit for (a) GdGaO calcined at 1300 °C for 2 h and (b) Eu doped GdGaO calcined at 1300 °C for 2 h. Vertical tick marks above the difference plot show the positions of the Bragg peaks.

Image of FIG. 3.
FIG. 3.

Scanning electron microscopy (SEM) picture of the Eu doped GdGaO calcined at 1300 °C for 2 h showing a presence of sub-micron size particle.

Image of FIG. 4.
FIG. 4.

(a) Photoluminescence excitation (PLE) spectra of Eu doped GdGaO phosphor calcined at 1300 °C for 2 h with a variation in the concentration of Eu. The excitation spectra were obtained by monitoring the emission of the Eu for the D → F transition (at 591 nm); (b) and (c)show the emission spectra of the Eu doped GdGaO phosphor on excitation with 254 nm and 395 nm, respectively; (d) CIE chromaticity diagram, inset shows the digital photograph of the powder under the UV lamp (wavelength 254 nm, 6 W) illumination.

Image of FIG. 5.
FIG. 5.

Temporal evolution of EuD → F (591 nm) emission intensity in Eu (0.15 mol) doped GdGaO phosphor sintered at 1300 °C for 2 h.

Image of FIG. 6.
FIG. 6.

(a) Upconversion spectrum of Eu and Yb co-doped GdGaO phosphor calcined at 1300 °C for 2 h; (b) Partial energy level diagram of Eu and Yb illustrating the possible upconversion mechanism involved.

Image of FIG. 7.
FIG. 7.

(a) A schematic illustration of the general strategy to achieve visual emission through a Dual-mode approach, i.e., through upconversion (UC) and photoluminescence (PL) processes, in Eu/Yb:GdGaO phosphor. (b) The curve shows the AM1.5 terrestrial solar spectrum in the 250–1250 nm region with a mention of conversion efficiency (CE) of silicon solar cell for different region. The emission through dual mode (PL and UC) approach matches well with the best response region for silicon solar cell.

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/content/aip/journal/jap/113/17/10.1063/1.4803053
2013-05-01
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Probing dual mode emission of Eu3+ in garnet phosphor
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/17/10.1063/1.4803053
10.1063/1.4803053
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