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- W2950798957 abstract "Eu 3+ and Tb 3+ ions singly activated Gd 2 O 2 S hollow spheres have been successfully synthesized via solvothermal method by using Gd (NO 3 ) 3 , Eu (NO 3 ) 3 , Tb (NO 3 ) 3 and thiourea as raw materials. Detailed characterization of the as-prepared samples were obtained by X-ray diffractometry (XRD), field emission scanning electron microscopy (FE-SEM), transmission electronic microscope (TEM) and photoluminescence (PL) spectroscopy. The results demonstrate that at 220 o C for 24 h, the molar ratio of thiourea/Gd 3+ has no significant impact on the phase composition of Gd 2 O 2 S products. With the reaction time increased from 6 h to 24 h, the morphology of Gd 2 O 2 S samples changed from ellipsoidal to near-spheroidal structure, but still remained hollow structure. PL results show that the strongest emission peaks for Gd 2 O 2 S:Eu 3+ and Gd 2 O 2 S:Tb 3+ samples were centered at 625 nm and 545 nm, corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ ions and 5 D 4 → 7 F 5 transition of Tb 3+ ions, respectively. The quenching concentrations for Eu 3+ and Tb 3+ ions were 12% and 6%, which can be attributed to the exchange interaction for Eu 3+ and Tb 3+ ions, respectively." @default.
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- W2950798957 date "2019-06-01" @default.
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- W2950798957 title "Solvothermal Synthesis and Luminescence Properties of Gd<sub>2</sub>O<sub>2</sub>S:RE<sup>3+</sup> (RE<sup>3+</sup>=Eu<sup>3+</sup>/Tb<sup>3+</sup>) Hollow Sphere" @default.
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