Solid-state synthesis, characterization and luminescent properties of Eu-doped gadolinium tungstate and molybdate phosphors: Gd(2−x)MO6:Eux (M=W, Mo) |
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Authors: | Fang Lei Hao-Hong Chen |
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Institution: | a Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, China b State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China |
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Abstract: | Red phosphors gadolinium tungstate and molybdate with the formula Gd(2−x)MO6:Eux3+ (M=Mo, W) were successfully synthesized by the solid-state reaction at 900 and 1300 °C for 4 h, respectively. The products were characterized by an X-ray powder diffractometer (XRD), TG-DSC, FT-IR, PL, UV-vis and SEM. Room-temperature photoluminescence indicated that the as-prepared Gd(2−x)MO6:Eux3+ (M=Mo, W) had a strong red emission, which is due to the characteristic transitions of Eu3+ (5D0→7FJ, J=0, 1, 2, 3, 4) for these phosphors. Meanwhile, the 5D0→7F2 is in the dominant position. The emission quantum efficiency of Eu3+ in the Gd(2−x)MO6:Eux3+ (M=Mo, W) system has been investigated. The XRD results indicate that both Gd2WO6 and Gd2MoO6 belong to the monoclinic system with space group C2/c A. Bril, G. Blasse, J. Chem. Phys. 45 (1966) 2350-2356] and I2/a A. Bril, G. Blasse, J. Chem. Phys. 45 (1966) 2350-2356], respectively. SEM images indicate that the shape of Gd1.96WO6:Eu0.043+ is aggregated small particles with a mean diameter of about 300 nm, and the shape of Gd1.96MoO6:Eu0.043+ is block-like structures. |
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Keywords: | Gadolinium tungstate Gadolinium molybdate Red phosphor Luminescent property Solid-state synthesis |
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