Enabling Next Generation Quantum Dot Emitters via Correlated Photophysics and Atomic Structure

通过相关光物理学和原子结构实现下一代量子点发射器

• 批准号: 1506587
• 负责人: Sandra Rosenthal
• 金额: $ 52万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-15 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1506587&HistoricalAwards=false
• 关键词: Enabling; Next; Generation; Quantum; Dot

With this award, the Macromolecular, Supramolecular and Nanochemistry Program of the Chemistry Division is funding Professors Sandra Rosenthal and James McBride at Vanderbilt University to accelerate the development of sub-microscopic crystals of semiconductors, or quantum dots. These structures emit light and are used in diverse applications such as solid state lighting and displays and labeling of biological structures for analysis using microscopy. The PIs have developed a new characterization method to determine how the efficiency of light emission from a quantum dot is correlated to its atomic structure. The ultimate goal is to optimize the light emission of quantum dot systems that do not utilize toxic lead and cadmium. As a part of this effort, the growing field of nanotechnology is being introduced to the next generation of scientists through undergraduate research opportunities and outreach activities for rural middle-school students.The proposed work is to synthesize cadmium free, colloidal core/shell nanocrystals and to characterize their ensemble charge carrier dynamics using femtosecond fluorescence upconversion spectroscopy. In parallel, the best performing structures will be identified by correlating fluorescence dynamics at the single nanocrystal level with the same particle's atomic structure and chemical composition determined using high resolution high angle annular darkfield scanning transmission electron microscopy (HAADF-STEM) in conjunction with energy dispersive spectroscopy mapping (STEM-EDS) utilizing Vanderbilt's Tecnai Osiris. The information gained through the ensemble carrier dynamics and the correlation study provides a target to improve the current synthesis methodology.

有了这个奖项，化学系的大分子，超分子和纳米化学计划正在资助范德比尔特大学的Sandra Rosenthal和James McBride教授，以加速半导体或量子点的亚微观晶体的发展。 这些结构发光，并用于各种应用，如固态照明和显示和生物结构的标记，以使用显微镜进行分析。 PI开发了一种新的表征方法来确定量子点的发光效率如何与其原子结构相关。最终目标是优化量子点系统的光发射，而不使用有毒的铅和镉。作为这一努力的一部分，不断增长的纳米技术领域正在通过本科生研究机会和农村中学生的外联活动介绍给下一代科学家，拟议的工作是合成无镉的胶体核/壳纳米晶体，并使用飞秒荧光上转换光谱来表征其系综电荷载流子动力学。同时，将通过将单次荧光水平的荧光动力学与相同颗粒的原子结构和化学组成相关联来识别性能最佳的结构，所述原子结构和化学组成使用高分辨率高角度环形暗场扫描透射电子显微镜（HAADF-STEM）结合能量色散光谱映射（STEM-EDS）利用范德比尔特的Tecnai Osiris来确定。通过系综载波动力学和相关性研究获得的信息提供了一个目标，以改善目前的综合方法。