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.

发光材料具有多种应用，例如光电子，光学检测，生物医学成像和传感。具有所需光学特性的材料正在通过形态控制，组成调整和表面修饰合成。找到结构和发光机制之间的联系对于改善光学特性和开发新型材料至关重要。同步加速器辐射光谱是一项快速加入的技术，可以提供无法通过实验室技术获得的关键信息。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，以透彻了解现有和新合成的无机发光材料中的发光机制。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，每种主题都具有一种材料。主题1。我​​将研究铅卤化物钙钛矿（LHP）的发光机理，并以所需的光学特性发展对LHP的受控合成。我将应用XAFS-XEOL来分析掺杂离子在LHP发光上的作用。通过监测使用纳米探针XEOL和原位XAFS-XEOL的三元CSXPBYBRZ化合物中的相变，我将制定策略来调整CSXPBYBRZ的相位以获得更高的发光。主题2。我将研究掺杂在生物活性钙（CAP）的组成和发光上的作用。我将研究发光与掺杂帽结构之间的相关性，并开发一种表征技术，以使用其光学性能跟踪盖物种的组成演化。主题3。我将使用XAFS-XEOL分析对金纳米群（AUNC）进行系统研究，以更深入地了解Auncs的发光如何受到金属配体，配体配体，纳米膨胀 - 细胞相互作用的影响。我将设计和执行原位XAFS-XEOL研究，以跟踪基于Au的双金合金NC的形成。明亮的发光Auncs将基于通过它们获得的基本知识设计，并作为新的生物医学传感器和成像剂进行了探索。 在建立新的同步基金设施和更新较旧的设施方面，全世界都有大量投资。 Synchrotron Spectroscopy用户社区大大扩展，潜在用户的数量正在大大增加。我将使用上述材料作为研究平台，我将开发同步器技术，目的是使它们可以被更广泛的社区访问。我将特别关注将XAFS+XEOL作为定量材料表征工具的机会，该工具可用于产品开发的产品开发，该工业在光电，石化，替代能源，绿色矿山或绿色化学领域的领域。