Full-Spectrum X-ray Excited Optical Luminescence System with Angle-Resolved and in situ Capabilities

我们建议升级我们的实验室X射线激发光致发光（XEOL）系统在化学系在西方大学成为一个国家的最先进的基础设施，具有全波长光谱采集从紫外（UV）到近红外（NIR），与角度分辨和原位/operando能力。XEOL是指跟踪发光材料如何将其吸收的X射线转换为光子。升级将在现有的运行中的超高真空（UHV）室上进行，该室配备有双阳极X射线管（目前已停止使用）、样品转移系统、具有加热和冷却功能的4轴360 °可旋转样品操纵器、用于气体环境控制的泄漏值和光谱仪。我们将获得资金更换使用了30年的X射线管，升级现有的光谱仪，将其探测能力扩展到近红外区域，并安装另一台带有光纤的CCD光谱仪，以便在X射线源的两侧以大约90度的距离同时探测XEOL。该系统将为Sham博士和Liu博士的研究小组合成的发光样品提供必要的常规表征能力，特别是满足日益增长的理解近红外发射生物材料和具有各向异性发光特性的高度取向半导体薄膜的发光机制的需求。该系统还将为西方的SWC（Soochow-Western同步辐射研究中心）和CAMBR（先进材料和生物材料研究中心）的研究人员提供令人兴奋的机会，以研究具有角度分辨和原位/操作能力的X射线诱导光学发光。它还将补充我们在加拿大光源开发的XEOL技术的进步，其中可调谐X射线用作激发源。该系统还将允许我们的学生在前往同步加速器之前预先筛选大量样品，以便更有效地利用宝贵的同步加速器时间。 申请人的团队包括在光电子学和生物医学研究中对纳米材料的光学性质进行积极研究的研究人员，例如半导体金属氧化物的形态和相依赖发光，卤化铅钙钛矿纳米晶体，掺杂磷酸钙，以及最近的生物相容性纳米材料与NIR持久发光。

We propose to upgrade our laboratory X-ray Excited Optical Luminescence (XEOL) system in the department of Chemistry at Western University into a state-of-the-art infrastructure featuring full-wavelength spectral acquisition from ultraviolet (UV) to near-infrared (NIR), with angle-resolved and in situ/operando capabilities. XEOL refers to tracking how light emitting materials converts the X-ray it absorbs into optical photons. The upgrade will be performed upon an existing, operational ultrahigh vacuum (UHV) chamber equipped with a twin-anode X-ray tube (currently out of service), a sample transfer system, a 4-axis 360o rotatable sample manipulator with heating and cooling function, leak values for gas environment control, and an optical spectrometer. We will acquire funds to replace the 30-years-old X-ray tube, to upgrade the existing spectrometer to extend its detection capability into the NIR region, and to implement another CCD spectrometer with optical fiber to allow XEOL detected simultaneously at both side of the X-ray source at approximately 90o apart. This system will provide the necessary routine characterization capability on light-emitting samples synthesized at Dr Sham's and Dr Liu's groups, particularly addressing the increasing need for understanding the luminescent mechanism of NIR-emitting biomaterials and highly-oriented semiconducting thin films with anisotropic luminescence properties. The system will also provide exciting opportunities for researchers at Western's SWC (Soochow-Western Centre for Synchrotron Radiation Research) and CAMBR (Centre for Advanced Materials and Biomaterials Research) to investigate X-ray induced optical luminescence with angle resolved and in situ/operando capabilities. It will also complement the advancement of the XEOL techniques we have been developing at the Canadian Light Source where a tunable X-ray is used as the excitation source. This system will also allow our students to pre-screen a large number of samples prior to traveling to the synchrotron, so that the precious synchrotron time can be used more effectively. The applicants' team includes researchers who have active research programs on optical properties of nanomaterials in optoelectronics and biomedical research, such as morphology and phase dependent luminescent from semiconductor metal oxides, lead halide perovskite nanocrystals, doped calcium phosphate, and more recently, biocompatible nanomaterials with NIR persistent luminescence.