Characterization of Light-Emitting Inorganic Nanomaterials using Synchrotron Radiation Spectroscopy

使用同步辐射光谱法表征发光无机纳米材料

• 批准号: RGPIN-2020-06675
• 负责人: Liu, Lijia
• 金额: $ 1.75万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=741367
• 关键词: Characterization; Light; Emitting; Inorganic; Nanomaterials

Light-emitting materials have a wide range of applications such as optoelectronics, optical detection, biomedical imaging, and sensing. Materials with desired optical properties are being synthesized through morphology control, composition tuning, and surface modifications. Finding the connection between structure and luminescence mechanism is crucial for improving the optical properties and developing novel materials. Synchrotron radiation spectroscopy is a fast-advancing technology that can provide key information that cannot be obtained through laboratory techniques. In my proposed research program, I will develop synchrotron-based characterization techniques to gain a thorough understanding of the luminescence mechanism in existing and newly synthesized inorganic light-emitting materials. I will use X-ray absorption fine structure (XAFS) and X-ray excited optical luminescence (XEOL) as my primary methods. My research program focuses on three themes, and each featuring one type of material. Theme 1. I will investigate the luminescence mechanism of lead halide perovskite (LHP) and develop controlled synthesis of LHP with desired optical properties. I will apply XAFS-XEOL to analyze the role of doping ions on the luminescence of LHP. By monitoring the phase transformation in a ternary CsxPbyBrz compound using nanoprobe XEOL and in situ XAFS-XEOL, I will develop strategies to tune the phase of CsxPbyBrz to achieve higher luminescence. Theme 2. I will investigate the role of doping on the composition and luminescence of bioactive calcium phosphate (CaP). I will study the correlation between luminescence and the structure of doped CaP, and develop a characterization technique to track composition evolution of CaP species using their optical properties. Theme 3. I will perform a systematic study on gold nanoclusters (AuNCs) using XAFS-XEOL analysis to gain a deeper understanding on how the luminescence of AuNCs are affected by metal-ligand, ligand-ligand, nanocluster-cellular interactions. I will design and perform in situ XAFS-XEOL study to track the formation of Au-based bimetallic alloy NCs. Bright light-emitting AuNCs will be designed based on fundamental knowledge obtained through these, and explored as new biomedical sensors and imaging agents. There has been significant investment worldwide in building new synchrotron facilities and in updating older ones. The synchrotron spectroscopy user community has greatly expanded, and the number of potential users is drastically increasing. Using the materials mentioned above as research platforms, I will develop synchrotron techniques with the aim of making them accessible to a wider community. I will pay particular attention to opportunities for presenting XAFS+XEOL as a quantitative materials characterization tool that may be used for product development by industry in the fields of optoelectronics, petrochemicals, alternative energy, green mining, or green chemistry.

发光材料具有广泛的应用，例如光电子学、光学检测、生物医学成像和传感等。通过形态控制、成分调整和表面改性来合成具有所需光学特性的材料。找到结构和发光机制之间的联系对于改善光学性能和开发新型材料至关重要。同步辐射光谱是一项快速发展的技术，可以提供通过实验室技术无法获得的关键信息。在我提出的研究计划中，我将开发基于同步加速器的表征技术，以全面了解现有和新合成的无机发光材料的发光机制。我将使用 X 射线吸收精细结构 (XAFS) 和 X 射线激发光学发光 (XEOL) 作为我的主要方法。我的研究计划侧重于三个主题，每个主题都包含一种材料。主题1.我将研究卤化铅钙钛矿（LHP）的发光机制，并开发具有所需光学性质的LHP的受控合成。我将应用XAFS-XEOL来分析掺杂离子对LHP发光的作用。通过使用纳米探针 XEOL 和原位 XAFS-XEOL 监测三元 CsxPbyBrz 化合物的相变，我将制定策略来调整 CsxPbyBrz 的相以实现更高的发光。主题 2. 我将研究掺杂对生物活性磷酸钙 (CaP) 的组成和发光的作用。我将研究发光与掺杂 CaP 结构之间的相关性，并开发一种表征技术，利用 CaP 的光学特性来跟踪其成分演化。主题 3. 我将使用 XAFS-XEOL 分析对金纳米团簇 (AuNC) 进行系统研究，以更深入地了解金纳米团簇的发光如何受到金属-配体、配体-配体、纳米团簇-细胞相互作用的影响。我将设计并进行原位 XAFS-XEOL 研究，以跟踪金基双金属合金 NC 的形成。明亮的发光 AuNC 将基于通过这些获得的基础知识进行设计，并探索作为新的生物医学传感器和成像剂。 全球范围内投入了大量资金来建设新的同步加速器设施和更新旧的同步加速器设施。同步加速器光谱用户群体大大扩大，潜在用户数量急剧增加。使用上述材料作为研究平台，我将开发同步加速器技术，旨在使更广泛的社区能够使用它们。我将特别关注展示 XAFS+XEOL 作为定量材料表征工具的机会，该工具可用于光电子、石化、替代能源、绿色采矿或绿色化学领域的工业产品开发。