Afterglow Properties and Trap-Depth Control in ZrO2:Ti, M (M = Ca2+, Y3+, Nb5+, W6+)
Afterglow Properties and Trap-Depth Control in ZrO2:Ti, M (M = Ca2+, Y3+, Nb5+, W6+)
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DOI：
10.1021/acs.inorgchem.0c01578
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发表时间：
2020-12-07
影响因子：
4.6
通讯作者：
Fujimoto, Kenjiro
中科院分区：
文献类型：
--
作者：
Aimi, Akihisa;Takahashi, Hiroaki;Fujimoto, Kenjiro
Ti掺杂的ZrO2是一种化学稳定的长余辉发光材料。掺杂和共掺杂是提高荧光粉余辉性能的有效途径，但对ZrO2：Ti体系共掺杂的研究较少。本研究旨在合成ZrO2：Ti，M（M = Ca2+，Y3+，Ti单掺杂，Nb5+，W6+），并评价所得材料的发光性能，特别关注陷阱深度与共掺杂阳离子价态之间的关系。使用组合方法优化了发光中心与共掺杂离子的比率，其中0.09摩尔% Ti导致最佳余辉持续时间。每个共掺杂样品的发射衰减曲线显著不同，其中由于存在多个陷阱，在Ti单掺杂和W6+共掺杂样品中观察到曲率的变化。从热释光发光曲线，陷阱起源于一个氧空位与峰在270 K左右观察到。陷阱的深度取决于被捕获的电子和它们周围的阳离子之间的静电相互作用，因此与共掺杂剂的价态有关。总的来说，与高价阳离子共掺杂导致改善的余辉持续时间。
Ti-doped ZrO2 is a chemically stable and persistent luminescence material. Doping and co-doping is an effective approach for improving the afterglow properties of phosphors, but few studies have investigated the co-doping of ZrO2:Ti systems. This study aimed to synthesize ZrO2:Ti, M (M = Ca2+, Y3+, Ti single-doped, Nb5+, W6+) and evaluate the luminescent properties of the resulting materials, with a specific focus on the relationship between trap depth and the valence state of the co-doped cation. The ratio of the luminescent center to co-doped ion was optimized using the combinatorial approach, where 0.09 mol % Ti led to the best afterglow duration. The emission decay curves of each codoped sample differed significantly, where a change in curvature was observed in the Ti single-doped and W6+ co-doped samples due to the presence of multiple traps. From the thermoluminescence glow curves, the trap originating in an oxygen vacancy with a peak at around 270 K was observed. The trap depth was dependent on electrostatic interactions between the trapped electrons and their surrounding cations, and thus related to the valence of the codopant. Overall, co-doping with high-valent cations led to improved afterglow duration.