Stabilization of UO22+ in SrHfO3 perovskite and probing defects, local structure and photo/thermoluminescence
Stabilization of UO22+ in SrHfO3 perovskite and probing defects, local structure and photo/thermoluminescence
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SrHfO3 钙钛矿中 UO22 的稳定性以及探测缺陷、局部结构和光/热致发光
DOI：
10.1016/j.jlumin.2021.118663
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发表时间：
2022
影响因子：
3.6
通讯作者：
K. Sudarshan
中科院分区：
文献类型：
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作者：
Santosh K. Gupta;M. Tyagi;K. Sudarshan
这项工作不仅从核技术和荧光粉行业的角度来看极其重要，而且对于理解锕系元素掺杂钙钛矿的基本材料方面也同样重要。在这项工作中，我们合成了 SrHfO3(SHO) 和 SrHfO3:U (SHOU) 钙钛矿。 SHO 证明了氧空位在紫外线照射下诱导可见光致发光。铀离子在 SrHfO3 钙钛矿中稳定为 UO22+ 离子，导致形成丰富的锶空位。这些缺陷充当陷阱中心并导致 SHOU 中产生强烈的热释光峰。寿命光谱表明UO22+离子在SrO8和HfO6多面体中的分布，其中前者占主导地位。在这项工作中，探讨了钙钛矿中锕系元素掺杂的一个非常具有挑战性的方面，旨在了解缺陷的形成、其局部结构和发光特性。
This work is extremely important not only from nuclear technology and phosphor industry perspective but equally important for understanding fundamental materials aspects of actinide doped perovskite. In this work we have synthesized both SrHfO3(SHO) and SrHfO3:U (SHOU) perovskite. SHO demonstrated oxygen vacancy induced visible photoluminescence on UV irradiation. Uranium ion stabilizes as UO22+ion in SrHfO3perovskite which resulted in the formation of abundance of strontium vacancies. Such defects act as a trap centre and leads to intense thermoluminescent peaks in SHOU. Lifetime Spectroscopy suggested the distribution of UO22+ion at both SrO8and HfO6polyhedra with predominant occupancy at former. Here in this work a very challenging aspect of actinide doping in perovskite is probed with intention to understand the formation of defect, its local structure and luminescence properties.