Na2CaSn2Ge3O12: A Novel Host Lattice for Sm3+-Doped Long-Persistent Phosphorescence Materials Emitting Reddish Orange Light

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• 作者：Jiao Xu ; Zhenghua Ju ; Xiuping Gao ; Yanqing An ; Xiaoliang Tang ; Weisheng Liu
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：December 16, 2013
• 年：2013
• 卷：52
• 期：24
• 页码：13875-13881
• 全文大小：443K
• 年卷期：v.52,no.24(December 16, 2013)
• ISSN：1520-510X

文摘

A novel host lattice disodium calcium ditin(IV) trigermanium oxide Na₂CaSn₂Ge₃O₁₂ was utilized for synthesizing long-persistent phosphorescence materials for the first time. Reddish orange long-persistent phosphorescence was observed in Na₂CaSn₂Ge₃O₁₂:Sm³⁺ phosphors with persistence time more than 4.8 h. The phosphors were synthesized by a conventional solid-state reaction pathway in air atmosphere. A predominant cubic phase of Na₂CaSn₂Ge₃O₁₂ was observed in all XRD patterns. Photoluminescence measurements indicated that the emission spectrum was composed of the peaks located at 566 (the strongest), 605, 664, and 724 nm. The results of the decay curves in terms of a biexponential model suggest that different defects appear in the crystal lattice. The defects acting as traps were investigated by thermoluminescence, which demonstrated that doping Sm³⁺ ions into the Na₂CaSn₂Ge₃O₁₂ host has made the trap types abundant. Furthermore, the origin of the long-persistent phosphorescence has also been discussed. On the basis of the above results, Sm³⁺-doped Na₂CaSn₂Ge₃O₁₂ phosphors are considered to have potential practical applications.