Powder X-ray diffraction (XRD) patterns of (a) Gd3Ga5O12 calcined at 1200 °C for 2 h, (b) Gd3Ga5O12 calcined at 1300 °C for 2 h, and (c) Eu3+ doped Gd3Ga5O12, calcined at 1300 °C for 2 h.
Observed (dots), calculated (continuous line), and difference (bottom line) profiles obtained after Le-Bail fit for (a) Gd3Ga5O12 calcined at 1300 °C for 2 h and (b) Eu3+ doped Gd3Ga5O12 calcined at 1300 °C for 2 h. Vertical tick marks above the difference plot show the positions of the Bragg peaks.
Scanning electron microscopy (SEM) picture of the Eu3+ doped Gd3Ga5O12 calcined at 1300 °C for 2 h showing a presence of sub-micron size particle.
(a) Photoluminescence excitation (PLE) spectra of Eu3+ doped Gd3Ga5O12 phosphor calcined at 1300 °C for 2 h with a variation in the concentration of Eu3+. The excitation spectra were obtained by monitoring the emission of the Eu3+ for the 5D0 → 7F1 transition (at 591 nm); (b) and (c)show the emission spectra of the Eu3+ doped Gd3Ga5O12 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.
Temporal evolution of Eu3+ 5D0 → 7F1 (591 nm) emission intensity in Eu3+ (0.15 mol) doped Gd3Ga5O12 phosphor sintered at 1300 °C for 2 h.
(a) Upconversion spectrum of Eu3+ and Yb3+ co-doped Gd3Ga5O12 phosphor calcined at 1300 °C for 2 h; (b) Partial energy level diagram of Eu3+ and Yb3+ illustrating the possible upconversion mechanism involved.
(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 Eu3+/Yb3+:Gd3Ga5O12 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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