title: [Preparation and luminescence properties of Tb3+ ion and Na2WO4 co-doped SiO2 materials].
abstract: Tb3+ and Na2 WO4 co-doped SiO2 materials were prepared by sol-gel method and the structure of materials were measured by DTA-TG, IR and XRD techniques. The results indicate that the materials were in amorphous phase andthe Si-O-Si bond was still observed in samples annealed at 800 degrees C. The influence of Na2 WO4 on luminescence properties of terbium glasses was investigated by three-dimension fluorescence spectra, excitation and emission spectra. It is approve that when sample excited by 230 nm showed the characteristic emission peaks of terbium corresponding to 5D4-(7) Fj (j = 4, 5, 6) and 5 D3 -(7)Fj (j = 4, 5, 6) transitions. Doping Na2 WO4 has less influence with the emission position of SiO2 materials with terbium, but has a great effect with the emission intensity. It is find that the blue transition of 5D4-7F6 was activated and the green transition of 5D4-7F5 was quenched and the materials radiate green blue fluorescence light under ultraviolet light. The mechanism of sample was analyzed by the energy levels of Tb3+ and Na2 WO4 co-doped glasses.
authors.affiliation: Chemistry & Environment Science College of Inner Mongolia Normal University, Hohhot 010022, China.
authors.forename: Xi-Gui
authors.initials: XG
authors.lastname: Wang
authors.forename: Xia
authors.initials: X
authors.lastname: Li
mesh_terms: D002412:Cations / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013055:Spectrophotometry, Infrared; D013725:Terbium / Q000032:analysis* / Q000737:chemistry; D017973:Tungsten Compounds / Q000032:analysis* / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D002412:Cations; D017973:Tungsten Compounds; D013725:Terbium; C025399:sodium tungstate(VI); D012822:Silicon Dioxide