无机化学学报

共掺La³⁺对Sr₂SnO₄∶Sm³⁺的余辉增强

Enhanced Long Persistence of Sr₂SnO₄∶Sm³⁺ Phosphor by Co-doping with La³⁺

作者	单位
沙　磊	暨南大学化学系纳米化学研究所，广州 510632
刘应亮	暨南大学化学系纳米化学研究所，广州 510632
雷炳富	暨南大学物理系，广州 510632
阳　区	暨南大学化学系纳米化学研究所，广州 510632
余彩霞	暨南大学化学系纳米化学研究所，广州 510632

摘要: 研究了以La³⁺离子为辅助激活剂，对Sm³⁺掺杂的发光材料Sr₂SnO₄∶Sm³⁺余辉性能的影响。采用传统的高温固相法合成Sr₂SnO₄ ∶Sm³⁺，La³⁺红色长余辉发光材料。利用X射线粉末衍射仪、荧光光谱仪、热释光剂量仪等手段对粉末样品进行了表征。分析结果表明，在1 400 ℃得到了单相Sr₂SnO₄，Sr₂SnO₄∶Sm³⁺, La³⁺发光粉末有563、599和646 nm 3个发射峰，与Sm³⁺单掺杂的Sr₂SnO₄∶Sm³⁺相比,其光谱发射峰位没有明显变化。余辉亮度衰减曲线表明适量的La³⁺掺杂可以延长Sr₂SnO₄∶Sm³⁺的余辉时间。通过对热释光谱的分析，解释了双掺杂发光粉余辉性能增强的原因，La³⁺掺杂增加了更多适宜深度的陷阱(V_Sr″)，可以有效存储光能，增强余辉的时间和强度。

关键词: 发光学余辉 Sr₂SnO₄ 镧钐热释光

基金项目:

Abstract: It is necessary to further improve the afterglow properties of Sr₂SnO₄∶Sm³⁺ red afterglow phosphors in consideration of its potential practical applications. In this work, Sr₂SnO₄∶Sm³⁺ red afterglow phosphors were prepared via the conventional solid-state reaction route and the enhanced properties were observed when La³⁺ ions were co-doped. The as-synthesized Sr₂SnO₄∶Sm³⁺,La³⁺ phosphors were characterized by using XRD, photolu-minescence and thermoluminescence spectrascopy. Sr₂SnO₄∶Sm³⁺ red afterglow phosphors are pure phase at 1 400 ℃ under atmospheric pressure. The emission spectrum shows that there are at least three peaks located at 563, 599 and 646 nm, and the peaks can be assigned to the ⁴G_5/2→⁶H_J (J=5/2, 7/2, 9/2) transitions of Sm³⁺ ion. The presence of La³⁺ ion does not cause any change in the emission spectrum of samarium. The decay patterns of afterglow curves demonstrate that the afterglow time of Sr₂SnO₄∶Sm³⁺ could be extended by the incorporation of La³⁺. The thermoluminescence glow curve results confirm that the enhanced afterglow properties of Sr₂SnO₄∶Sm³⁺, La³⁺ is comparable to Sr₂SnO₄∶Sm³⁺. This implies that the codoping increases more appropriate traps (V_Sr″) which are in favour of energy storage, higher brightness and longer lasting time.

Keywords: optics long afterglow Sr₂SnO₄ lanthanum samarium thermoluminescence

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全文下载次数: 1968

沙　磊,刘应亮,雷炳富,阳　区,余彩霞.共掺La³⁺对Sr₂SnO₄∶Sm³⁺的余辉增强[J].无机化学学报,2012,28(3):523-526.

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