Metal-to-metal charge transfer band position control and luminescence quenching by cationic substitution in NaNbO3:Pr3+
Metal-to-metal charge transfer band position control and luminescence quenching by cationic substitution in NaNbO3:Pr3+
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DOI：
10.1117/12.2253177
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
V. Castaing;L. Li;D. Rytz;Y. Katayama;A. Sontakke;S. Tanabe;Mingying Peng;Bruno Viana
中科院分区：
文献类型：
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作者：
V. Castaing;L. Li;D. Rytz;Y. Katayama;A. Sontakke;S. Tanabe;Mingying Peng;Bruno Viana
显示有效的红色发光持久发光的材料的开发仍然是一个持续的挑战。由于它显示出红色发射，在613 nm附近，Pr 3+仍然是这种应用的良好候选者。事实上，从1D 2激发态到3 H4基态的跃迁是红色发射的原因。本文研究了K或Li离子对NaNbO_3：Pr ~（3+）晶体中Na的取代对MMCT带位的影响及其对余辉发光性能的可能影响。MMCT能量随钙钛矿A位（A = Li，Na，K，Pr）平均间距的增大而增大。在MMCT激发下，在Li0.03Na0.97NbO3：Pr 3+中观察到最强（有效）的光致发光。基于构型坐标模型讨论了弛豫途径。
The development of materials showing efficient red-emitting persistent luminescence is still an ongoing challenge. As it shows red emission, around 613 nm, Pr3+ remains a good candidate for such application. Indeed, the transition from its 1D2 excited state to its 3H4 ground state is responsible of the red emission. In this paper the effect of Na substitution in NaNbO3:Pr3+ by K or Li cations in term of Metal-to-Metal Charge Transfer (MMCT) band position and its possible effect on persistent luminescence properties were investigated. MMCT energy shows increasing tendency with increasing average distance between A site (A = Li, Na, K, Pr) of perovskite. The most intense (efficient) photoluminescence was observed under MMCT excitation in Li0.03Na0.97NbO3:Pr3+. The relaxation pathways were discussed based on the configurational coordinate model.