Na2CaSn2Ge3O12: a novel host lattice for Sm3+-doped long-persistent phosphorescence materials emitting reddish orange light.
Na2CaSn2Ge3O12: a novel host lattice for Sm3+-doped long-persistent phosphorescence materials emitting reddish orange light.
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DOI：
10.1021/ic401262w
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发表时间：
2013-11
影响因子：
4.6
通讯作者：
Jiao Xu;Zhenghua Ju;Xiuping Gao;Yanqing An;Xiaoliang Tang;Weisheng Liu
中科院分区：
文献类型：
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作者：
Jiao Xu;Zhenghua Ju;Xiuping Gao;Yanqing An;Xiaoliang Tang;Weisheng Liu
首次利用新型主体晶格二锡钙二钠氧化物Na2CaSn2Ge3O12合成了长余辉发光材料。在Na2CaSn2Ge3O12：Sm(3+)荧光粉中观察到了橙红色的长余辉发光，余辉时间超过4.8h。该荧光粉是在空气中用传统的固相反应合成的。在所有的X射线衍射图中都观察到了以Na2CaSn2Ge3O12为主的立方相。光致发光测量表明，发射光谱由位于566(最强)、605、664和724 nm的峰组成。双指数模型衰减曲线的结果表明，晶格中出现了不同的缺陷。热释光研究表明，Sm(3+)离子掺杂到Na2CaSn2Ge3O12基质中使陷阱类型更加丰富。此外，还对长余辉发光的起源进行了讨论。基于上述结果，Sm(3+)掺杂的Na2CaSn2Ge3O12荧光粉被认为具有潜在的实际应用价值。
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:Sm(3+) 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 Sm(3+) 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, Sm(3+)-doped Na2CaSn2Ge3O12 phosphors are considered to have potential practical applications.