AVS 65th International Symposium & Exhibition
    Actinides and Rare Earths Focus Topic Thursday Sessions
       Session AC-ThP

Paper AC-ThP1
Upconversion Photoluminescence Efficiency Dependence of Yb ions in Gd0.91-xNbO4: Ybx3+, Er0.09

Thursday, October 25, 2018, 6:00 pm, Room Hall B

Session: Actinides and Rare Earths Poster Session
Presenter: Seung Gon Lee, Silla University, Republic of Korea
Authors: S.S. Yi, Silla University, Republic of Korea
S.G. Lee, Silla University, Republic of Korea
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Gd(0.91-x)NbO4 : Er3+0.09, Yb3+x (x= 0.03, 0.06, 0.09, 0.12 and 0.15) phosphors were synthesized by the facile solid state reaction method. Yb3+ concentrations were changed from 0.03 to 0.15 mol for the fixed Er3+concentration at 0.09 mol. The particle size of phosphors was around 180 ~ 350 nm and shape were angular oval observed by scanning electron microscopy. The crystalline structures of the phosphors were investigated by X-ray diffraction. The photoluminescence emission based on the green emissions near 528 and 551 nm and red emissions near 657 and 675 nm were observed and the highest emission intensity occurred for the sample Yb0.15 Er0.09. Also, under the 980 nm excitation, Er3+, Yb3+ co-doped GdNbO4 phosphors appeared the up-conversion emission based on the green emission near 535 nm and 556 nm radiated by 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions and red emission about 657 nm and 675 nm radiated by 4F9/2 → 4I15/2 transition, which assigned to the intra 4f transitions of Er3+ ions.