title: Sol-gel preparation and luminescent properties of red-emitting phosphor Sr-Ba-Mo-W-O-(Eu(3+),Sm(3+)).
abstract: Two series of red-emitting phosphors Sr-Ba-Mo-W-O:Eu,Sm and Sr-Ba-Mo-W-O:Eu have been synthesized by a sol-gel method. The effects of the chemical composition, concentrations of Sm(3+) and Eu(3+), the Sr(2+)/Ba(2+) ratio, and the W(6+)/Mo(6+) ratio on the luminescent properties were investigated. The as-prepared phosphors were characterized by X-ray diffraction and Raman spectra. Results showed that single phases of the two series were prepared. The compositions of Sr0.6 Ba0.13Mo0.8 W0.2O4:Eu0.10Sm0.08 and Sr0.75Ba0.1Mo0.8 W0.2O4:Eu0.10 had the strongest luminescent intensity. The excitation spectra of Sm(3+), Eu(3+) co-doped phosphors were broader and the strongest peak moved to 404 nm when compared with that of Eu(3+) single-doped phosphors. The luminescent intensity of the Sr0.6Ba0.13Mo0.8W0.2O4:Eu0.10 Sm0.08 at 618 nm were 2.8 times greater than that of Sr0.75Ba0.1Mo0.8 W0.2O4:Eu0.10. The luminescent intensity of Sr0.6Ba0.13Mo0.8 W0.2 O4:Eu0.10Sm0.08 and Sr0.75Ba0.1Mo0.8W0.2O4:Eu0.10 at 150 °C decreased to 56.8% and 50.3% of the initial value at room temperature, respectively.
authors.affiliation: School of Science, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Li
authors.affiliation: School of Science, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
authors.forename: Huidong
authors.initials: H
authors.lastname: Xie
authors.affiliation: School of Science, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
authors.forename: Haihong
authors.initials: H
authors.lastname: Xi
authors.affiliation: Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
authors.forename: Xiaochang
authors.initials: X
authors.lastname: Wang
mesh_terms: D001464:Barium / Q000737:chemistry; D003116:Color; D005063:Europium / Q000737:chemistry; D049449:Luminescence; D008982:Molybdenum / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D044367:Phase Transition; D012493:Samarium / Q000737:chemistry; D013324:Strontium / Q000737:chemistry; D014414:Tungsten / Q000737:chemistry
chemical_list: D001464:Barium; D012493:Samarium; D005063:Europium; D008982:Molybdenum; D010100:Oxygen; D014414:Tungsten; D013324:Strontium
keywords: LED; luminescence; phosphors