Dopant site-dependent luminescence from rare-earth doped dibarium octafluorohafnate Ba2HfF8 nanocubes for radiation detection,Journal of Materials Chemistry C

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Dopant site-dependent luminescence from rare-earth doped dibarium octafluorohafnate Ba2HfF8 nanocubes for radiation detection
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-1-12 , DOI: 10.1039/d0tc05051b
Vineet Kumar _{1,

2,

3,

4,

5} , Gibin George _{1,

2,

3,

4,

5} , Jacob I. Hayes _{1,

2,

3,

4,

5} , Yulin Lin _{5,

6,

7,

8} , Burak Guzelturk _{5,

7,

8,

9} , Jianguo Wen _{5,

6,

7,

8} , Zhiping Luo _{1,

2,

3,

4,

5}

Affiliation

Development of new host materials containing heavy elements for radiation detection is highly desirable. In this work, dibarium octafluorohafnate, Ba₂HfF₈, doped with rare-earth ions, was synthesized as cube-shaped nanocrystals via a facile hydrothermal method. The host lattice contains two Ba²⁺ crystallographic sites, and dopants on these sites exhibit site-dependent photoluminescence (PL), cathodoluminescence (CL) and X-ray excited radioluminescence (RL) characteristics. Single doping contents were optimized as 25 mol% Tb³⁺ and 5 mol% Eu³⁺. In Ba₂HfF₈:Tb³⁺–Eu³⁺ codoped nanocrystals, preferrable occupation of Eu³⁺ and Tb³⁺ at two different Ba²⁺ sites in the host lattice was observed. The nanocubes exhibited enhanced emissions over micron sized particles. In PL, the presence of Tb³⁺ ions significantly enhanced the emission intensity of Eu³⁺ ions due to energy transfer from the Tb³⁺ to Eu³⁺ ions, while under high-energy irradiation in CL or RL, Tb³⁺ emission was intensified. X-ray induced RL with afterglow in seconds was observed. It was found that the codoped sample showed higher sensitivity than the singly doped sample, indicating that codoping is an effective strategy to develop a scintillator with this host structure for high-energy radiation detection.

中文翻译：

稀土掺杂八氟fluoro酸钡Ba2HfF8纳米立方体的掺杂剂位点依赖发光用于辐射检测

非常需要开发用于辐射检测的包含重元素的新型主体材料。在这项工作中，通过简便的水热法将掺有稀土离子的八氟ha酸二钡Ba ₂ HfF ₈合成为立方体状纳米晶体。主体晶格包含两个Ba ²⁺晶体学位点，并且这些位点上的掺杂物表现出位点依赖性光致发光（PL），阴极发光（CL）和X射线激发放射致发光（RL）的特性。将单个掺杂含量优化为25 mol％Tb ³⁺和5 mol％Eu ³⁺。In Ba ₂ HfF ₈：Tb ³⁺ –Eu ³⁺在共掺杂的纳米晶体中，观察到Eu ³⁺和Tb ³⁺在主体晶格的两个不同Ba ²⁺位点上的优选占据。纳米立方体表现出比微米级颗粒更高的发射。在PL中，由于能量从Tb ³⁺转移到Eu ³⁺离子，Tb ³⁺离子的存在显着增强了Eu ³⁺离子的发射强度，而在CL或RL中高能辐照下，Tb ³⁺排放加剧。观察到X射线诱导的RL，并在几秒钟内产生余辉。发现共掺杂样品比单掺杂样品具有更高的灵敏度，这表明共掺杂是开发具有这种主体结构的闪烁体以进行高能辐射检测的有效策略。

更新日期：2021-01-12

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