Optical Excitations and Applications in Novel Organic Macromolecular Aggregates

新型有机高分子聚集体的光激发及其应用

• 批准号: 0802968
• 负责人: Theodore Gore Goodson
• 金额: $ 31.5万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2014-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0802968&HistoricalAwards=false
• 关键词: Optical; Excitations; Applications; Novel; Organic

TECHNICAL SUMMARYAn important step in the process of creating new materials for energy harvesting and nonlinear optical devices is in the understanding of the structure-function relationships based on size, geometry (cyclic, 2-dimensional), and intramolecular interactions. This proposal is directed at the development of novel organic multifunctional materials and the use of ultra-fast coherent spectroscopy to probe energy migration, nonlinear optical, and quantum interference phenomena in these materials. The PI will carry out Investigations of several novel aggregated systems will be performed. Specifically, using a combination of femtosecond spectroscopic methods such as femtosecond time-resolved fluorescence upconversion, transient absorption, transient grating, three pulse photon echo peak shift experiments complemented with those of steady state spectroscopy we will deeply investigate a variety of novel macromolecular aggregated architectures. These architectures include dendrimers with broken symmetry, new two-dimensional macromolecular structures, giant cyclic macromolecular thiophene aggregates, as well as a novel porphyrin aggregate. The PI will perform extensive modeling based on recent theoretical approaches describing exciton migration, self-trapping and the details of the excitation energy transfer between aggregated systems. NON-TECHNICAL SUMMARYThe broader impact of this proposal is directed to the PI's science education activities which have been successful in encouraging young scientists of diverse backgrounds as well as the participation of women. The PI will continue to bring young scientists into the field of material science and inspire careers in science with participation in summer enrichment and mentorship programs as part of on campus and national organizations. Continued interactions with Ann Arbor and Detroit public high schools will be carried out in summer research opportunities in the PI's laboratory.

技术综述在创造用于能量收集和非线性光学器件的新材料的过程中，一个重要的步骤是理解基于尺寸、几何(循环的、二维的)和分子内相互作用的结构-功能关系。这项建议旨在开发新型有机多功能材料，并使用超快相干光谱来探测这些材料中的能量迁移、非线性光学和量子干涉现象。PI将对几个新的聚合系统进行调查。具体地说，我们将结合飞秒时间分辨荧光上转换、瞬时吸收、瞬时光栅法、三脉冲光子回波峰移实验和稳态光谱等飞秒光谱方法，深入研究各种新型的大分子聚集结构。这些结构包括对称性被破坏的树枝状大分子、新的二维大分子结构、大环状大分子的噻吩聚集体以及一种新的卟啉聚集体。PI将基于最近描述激子迁移、自捕获和聚集系统之间激发能量转移的细节的理论方法来进行广泛的建模。非技术总结这项建议的更广泛影响是针对国际科学协会的科学教育活动，这些活动成功地鼓励了不同背景的青年科学家以及妇女的参与。PI将继续将年轻科学家带入材料科学领域，并通过参加夏季充实和导师计划来激励科学事业，这是校园和国家组织的一部分。继续与安娜堡和底特律公立高中的互动将在暑假期间在PI的实验室进行研究机会。