Self-assembled three-dimensional NaY(WO4)2:Ln 3+ architectures: Hydrothermal synthesis, growth mechanism and luminescence properties

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[1] [1,Huang, Shaohua
[2] 1,Wang, Dong
[3] 1,Wang, Yan
[4] 1,Wang, Liuzhen
[5] 1,Zhang, Xiao
[6] Yang, Piaoping
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Yang, P. (yangpiaoping@hrbeu.edu.cn) | 1600年 / Elsevier Ltd卷 / 529期
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Novel three-dimensional (3D) flower-like NaY(WO4) 2:Ln3+ (Ln = Eu; Yb/Er; Yb/Tm and Yb/Ho) microstructures with uniform shape and dimension have been prepared using Y(OH)CO3 nanospheres as sacrificial template through a hydrothermal process and followed by a subsequent heat treatment process. The whole process was carried out in aqueous condition without using any organic solvents; surfactant; or catalyst. The phase; morphology; size; and photoluminescence (PL) properties were well characterized by means of X-ray diffraction (XRD); scanning electron microscopy (SEM); transmission electron microscopy (TEM); and high-resolution transmission electron microscopy (HRTEM); photoluminescence; (PL); spectra; and kinetic decays; respectively. The results reveal that the as-prepared precursor of NaY(WO 4)2:Eu3+ exhibits interesting white light emission under UV excitation. After annealing; the as-obtained 3D flower-like NaY(WO4)2:Eu3+ microstructures show exclusively red (Eu3+; 5D0; →; 7F; 2); luminescence; Furthermore; the up-conversion (UC) luminescent properties and the emission mechanisms of NaY(WO4) 2:Yb3+/Ln3+ (Ln = Er; Tm; Ho) microstructures have been systematically studied; which show respective green (Er3+; 4S3/2; 2H11/2; 4I15/2); blue; (Tm3+; 1G4 → 3H6) and yellow-green (Ho3+; 5S2 → 5I8) luminescence under 980 nm NIR excitation. © 2012 Elsevier B.V. All rights reserved;
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