Preparation And Characterization Of Rare Earth Irons Doped Barium Tungstate Luminescent Material

Taking BaWO4as the substrate, this paper permeated rare earth ions into it to get the BaWO4:Yb3+/Tm3+nanocrystalline and BaWO4:Yb3+/Er3+nanocrystalline which had the up conversion on the luminous performance. Analyzed by the X-ray diffraction (XRD) test and SEM test, it was confirmed that BaWO4、BaWO4:Yb3+/Tm3+and BaWO4:Yb3+/Er3+were both scheelite tetragonal crystal system structure. The particle size range was from28nm to45nm and nanoparticle dispersed evenly. The emission spectrum was measured by980nm semiconductor laser as excitation light source and Hitachi F-4500spectrophotometer. The results showed:1. There were four emission peaks in the emission spectrum of BaWO4:Yb3+/Tm3+sample. They were blue emission peaks of454nm and475nm and red emission peaks of647nm and790nm, which were corresponding to1D2�'3F4transition,1G4�'3H6transition,1G4�'3F4transition and3H4�'3H6transition of Tm3+ion respectively. The blue emission peak of454nm was four photon process while the red emission peak of475nm was three photon process. When CTm is1.0mol%and CYb/CTm was2:1, luminous intensity reached the largest value.2. There were three emission peaks in the emission spectrum of BaWO4:Yb3+/Er3+sample. They were green emission peaks of524nm and549nm and red emission peak of655nm, which were corresponding to2H11/2�'4I15/2,4S3/2�'4I15/2and4F9/2�'4I15/2transition of Er3+ion respectively. The emission peaks of524nm,549nm and655nm were double photon process. When CEr was1.5mol%and CYb/CEr was7:1, luminous intensity reached the largest value.