Solvothermal Synthesis and Luminescence Properties of Gd₂O₂S:RE³⁺ (RE³⁺=Eu³⁺/Tb³⁺) Hollow Sphere

Abstract:

Eu³⁺ and Tb³⁺ ions singly activated Gd₂O₂S hollow spheres have been successfully synthesized via solvothermal method by using Gd (NO₃)₃, Eu (NO₃)₃, Tb (NO₃)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 ^oC for 24 h, the molar ratio of thiourea/Gd³⁺ has no significant impact on the phase composition of Gd₂O₂S products. With the reaction time increased from 6 h to 24 h, the morphology of Gd₂O₂S samples changed from ellipsoidal to near-spheroidal structure, but still remained hollow structure. PL results show that the strongest emission peaks for Gd₂O₂S:Eu³⁺ and Gd₂O₂S:Tb³⁺ samples were centered at 625 nm and 545 nm, corresponding to the ⁵D₀→⁷F₂ transition of Eu³⁺ ions and ⁵D₄→⁷F₅ transition of Tb³⁺ ions, respectively. The quenching concentrations for Eu³⁺ and Tb³⁺ ions were 12% and 6%, which can be attributed to the exchange interaction for Eu³⁺ and Tb³⁺ ions, respectively.

• Periodical: Key Engineering Materials (Volume 807)
• Pages: 1-10
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.807.1
• Online since: June 2019
• Authors: Guang Xi Xu, Xiao Tong Sang, Jing Bao Lian*, Nian Chu Wu, Xue Zhang
• Keywords: Hollow Sphere, Photoluminescence, Rare Earth Oxysulfide, Solvothermal Method

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