Solid-state synthesis, characterization and luminescent properties of Eu{sup 3+}-doped gadolinium tungstate and molybdate phosphors: Gd{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M=W, Mo)

Journal Article · Wed Oct 15 04:00:00 EDT 2008 · Journal of Solid State Chemistry

OSTI ID:21212073

Fang, Lei ^[1]; Haohong, Chen ^[2]

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1. Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092 (China)
2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)

Red phosphors gadolinium tungstate and molybdate with the formula Gd{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M=Mo, W) were successfully synthesized by the solid-state reaction at 900 and 1300 deg. 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{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M=Mo, W) had a strong red emission, which is due to the characteristic transitions of Eu{sup 3+} ({sup 5}D{sub 0}{yields}{sup 7}F{sub J}, J=0, 1, 2, 3, 4) for these phosphors. Meanwhile, the {sup 5}D{sub 0}{yields}{sup 7}F{sub 2} is in the dominant position. The emission quantum efficiency of Eu{sup 3+} in the Gd{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M=Mo, W) system has been investigated. The XRD results indicate that both Gd{sub 2}WO{sub 6} and Gd{sub 2}MoO{sub 6} 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 Gd{sub 1.96}WO{sub 6}:Eu{sub 0.04}{sup 3+} is aggregated small particles with a mean diameter of about 300 nm, and the shape of Gd{sub 1.96}MoO{sub 6}:Eu{sub 0.04}{sup 3+} is block-like structures. - Graphical abstract: Excellent red phosphors gadolinium tungstate and molybdate with the formula Gd{sub (2-x)}MO{sub 6}:Eu{sub x}{sup 3+} (M = Mo, W) were synthesized by the conventional solid-state reaction at 900 and 1300deg. C for 4 h, respectively. SEM imagines indicate that the morphology of Gd{sub 1.96}WO{sub 6}:Eu{sup 3+}{sub 0.04} has 3D micro-pore network structures better than the block-like Gd{sub 1.96}MoO{sub 6}:Eu{sup 3+}{sub 0.04}. Their quantum efficiency has been investigated.

• OSTI ID: 21212073
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
DOPED MATERIALS
EUROPIUM IONS
GADOLINIUM TUNGSTATES
INFRARED SPECTRA
MOLYBDATES
MONOCLINIC LATTICES
MORPHOLOGY
PHOSPHORS
PHOTOLUMINESCENCE
QUANTUM EFFICIENCY
SCANNING ELECTRON MICROSCOPY
SPACE GROUPS
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
X-RAY DIFFRACTION