Persistent luminescence and its mechanism of Ba5(PO4)3Cl:Ce3+,Eu2+
Persistent luminescence and its mechanism of Ba5(PO4)3Cl:Ce3+,Eu2+
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DOI：
10.1063/1.4723646
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发表时间：
2012-06
影响因子：
3.2
通讯作者：
G. Ju;Yihua Hu;Li Chen;Xiaojuan Wang
中科院分区：
文献类型：
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作者：
G. Ju;Yihua Hu;Li Chen;Xiaojuan Wang
研究了铈共掺杂铕掺杂钡氯磷灰石的持续发光。系统地研究了荧光粉的发光特性，包括光致发光、发光衰减和热释光。这种材料是持久发光领域尚未解决的问题的关键。在实验结果的基础上，我们建立了一个持续发光的模型。在我们的模型中，部分Eu ~（2+）离子在短紫外光激发下被氧化为Eu ~（3+），释放出的电子被捕获在Ce ~（3+）引入的正替位缺陷处。持续发光来自于这些被捕获的电子与光电离的Eu 3+离子的复合。替代缺陷与俘获电子之间的库仑吸引作用，沿着电子-电子排斥作用，构成了一个亚稳态的类激子陷阱。在一级近似下，镧系元素共掺杂的第三电离能和离子半径可以用来合理化镧系元素共掺杂的机理。
We investigated the persistent luminescence in europium-doped barium chloroapatite upon codoping with cerium. Luminescence properties of the phosphors, including photoluminescence, luminescence decay, and thermoluminescence are systematically studied. This material holds the key to the unsettled questions in the field of persistent luminescence. We formulated a model of persistent luminescence on the basis of the experimental results. In our model, some Eu2+ ions are oxidized to Eu3+ under short UV excitation, and the released electrons are trapped at positive substitutional defect introduced by Ce3+. The persistent luminescence arises from the recombination of these trapped electrons with the photo-ionized Eu3+ ions. The effects of Coulomb attraction between the substitutional defect and trapped electron, along with electron–electron repulsion, construct a metastable exciton-like trap. To a first approximation, the third ionization energy and ionic radius of lanthanide codopant can be used to rationalize...