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Nanopowder of Cr:GGG and nanopowder of Cr,Nd:GGG with different concentrations of Cr~(3+) ranging from 0.1 at.% to 1.5 at.% were synthesized by the sol-gel method using acetic acid and ethylene glycol. Thermal gravimetric analysis and differential scanning calorimetry(TGA-DSC), X-ray diffraction(XRD) and photoluminescence spectroscopy were used to characterize the powder. The crystallite size was about 58 nm when treated at 1000 oC for 2 h. Cr~(3+) photoluminescence spectrum in GGG showed a broad band emission around 730 nm. The intensity of this band decreased when co-doped with Nd, indicating an efficient energy transfer from Cr~(3+) to Nd~(3+). Photoluminescence intensity of Nd in Cr,Nd:GGG at 1.06 μm showed that the optimum concentration of Cr~(3+) was about 1 at.%(more or less) for 1 at.% Nd~(3+). This result was also confirmed by chromium fluorescence decay rate analysis. Energy transfer efficiency was found to be about 84% for 1 at.% concentration of each chromium and neodymium.
Nanopowder of Cr: GGG and nanopowder of Cr, Nd: GGG with different concentrations of Cr ~ (3+) ranging from 0.1 at.% To 1.5 at.% Were synthesized by the sol-gel method using acetic acid and ethylene glycol. gravimetric analysis and differential scanning calorimetry (TGA-DSC), X-ray diffraction (XRD) and photoluminescence spectroscopy were used to characterize the powder. The crystallite size was about 58 nm when treated at 1000 oC for 2 h. Cr ~ (3+ ) photoluminescence spectrum in GGG showed a broad band emission around 730 nm. The intensity of this band decreased when co-doped with Nd, indicating an efficient energy transfer from Cr ~ (3+) to Nd ~ (3+). Photoluminescence intensity of Nd in Cr, Nd: GGG at 1.06 μm showed that the optimum concentration of Cr ~ (3+) was about 1 at.% (More or less) for 1 at.% Nd ~ (3+). by chromium fluorescence decay rate analysis. Energy transfer efficiency was found to be about 84% for 1 at.% concentration of each chromium and neodymium .