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Boltzmann Thermometry in Cr3+‐Doped Ga2O3 Polymorphs: The Structure Matters!
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-02-24 , DOI: 10.1002/adom.202100033
Michele Back 1 , Jumpei Ueda 1 , Hiroshi Nambu 1 , Masami Fujita 1 , Akira Yamamoto 1, 2 , Hisao Yoshida 1, 2 , Hiromitsu Tanaka 3 , Mikhail G. Brik 1, 4 , Setsuhisa Tanabe 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-02-24 , DOI: 10.1002/adom.202100033
Michele Back 1 , Jumpei Ueda 1 , Hiroshi Nambu 1 , Masami Fujita 1 , Akira Yamamoto 1, 2 , Hisao Yoshida 1, 2 , Hiromitsu Tanaka 3 , Mikhail G. Brik 1, 4 , Setsuhisa Tanabe 1
Affiliation
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The performance of luminescent Cr3+‐doped thermometers is strongly influenced by the locally surrounding ligand field. A universal relationship between the thermometric performance and structural/chemical parameters is highly desirable to drive the development of effective Cr3+‐based thermal sensors avoiding trial‐and‐error procedures. In this view, as prototypes, the electronic structure and the thermometric performance of Cr3+‐doped α‐Ga2O3 and β‐Ga2O3 polymorphs are compared. Combining a detailed theoretical and spectroscopic investigation, the electronic configuration and the crystal field (CF) acting on the Cr3+ in α‐Ga2O3 are described for the first time and compared with β‐Ga2O3:Cr3+ polymorph to discuss the thermometric behavior. A linear relationship between the 4T2–2E energy gap (directly linked to the relative sensitivity) and the CF strength Dq is demonstrated for a wide variety of materials. This trend can be considered as a first step to set guiding principles to design effective Cr3+‐based Boltzmann thermometers. In addition, as a proof of concept, particles of β‐Ga2O3:Cr3+ thermometer are used to locally measure in operando thermal variations of Pt catalysts on β‐Ga2O3:Cr3+ support during a catalytic reaction of C2H4 hydrogenation in a contactless and reliable mode, demonstrating their real potentials.
中文翻译：
Cr3 +掺杂的Ga2O3多晶型物的Boltzmann测温：结构很重要！
掺杂Cr 3+的发光温度计的性能受本地周围配体场的强烈影响。为了推动有效的基于Cr 3+的热传感器的开发，避免反复试验，迫切需要温度测量性能与结构/化学参数之间的通用关系。在此视图中，作为原型，电子结构和Cr的测温性能3+掺杂的α-嘎2 ö 3和的β-Ga 2个ö 3多晶型物进行了比较。结合详细的理论和光谱研究，电子结构和作用于α-Ga中Cr 3+的晶体场（CF）2 ø 3首次描述，并与的β-Ga 2 ö 3：铬3+多晶型物，讨论测温行为。对于多种材料，证明了4 T 2 – 2 E能隙（直接与相对灵敏度相关）与CF强度Dq之间的线性关系。这种趋势可以看作是制定指导原则以设计有效的基于Cr 3+的玻尔兹曼温度计的第一步。另外，作为概念证明，颗粒的β-Ga 2 ö 3：铬3+温度计用于在铂催化剂上的β-Ga operando热变化本地测量2 ö 3：铬3+ ℃的催化反应过程中支持2 ħ 4氢化以非接触和可靠方式，展示了其真正潜力。
更新日期：2021-05-05
中文翻译：
Cr3 +掺杂的Ga2O3多晶型物的Boltzmann测温：结构很重要！
掺杂Cr 3+的发光温度计的性能受本地周围配体场的强烈影响。为了推动有效的基于Cr 3+的热传感器的开发，避免反复试验，迫切需要温度测量性能与结构/化学参数之间的通用关系。在此视图中，作为原型，电子结构和Cr的测温性能3+掺杂的α-嘎2 ö 3和的β-Ga 2个ö 3多晶型物进行了比较。结合详细的理论和光谱研究，电子结构和作用于α-Ga中Cr 3+的晶体场（CF）2 ø 3首次描述，并与的β-Ga 2 ö 3：铬3+多晶型物，讨论测温行为。对于多种材料，证明了4 T 2 – 2 E能隙（直接与相对灵敏度相关）与CF强度Dq之间的线性关系。这种趋势可以看作是制定指导原则以设计有效的基于Cr 3+的玻尔兹曼温度计的第一步。另外，作为概念证明，颗粒的β-Ga 2 ö 3：铬3+温度计用于在铂催化剂上的β-Ga operando热变化本地测量2 ö 3：铬3+ ℃的催化反应过程中支持2 ħ 4氢化以非接触和可靠方式，展示了其真正潜力。
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