Triplet Photophysics in Donor-Acceptor and pi-Conjugated Systems

供体-受体和 pi 共轭系统中的三重态光物理学

• 批准号: 1504727
• 负责人: Kirk Schanze
• 金额: $ 52万
• 依托单位: University of Florida
• 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 2017-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1504727&HistoricalAwards=false
• 关键词: Triplet; Photophysics; Donor; Acceptor; pi; Triplet; Photophysics; Donor; Acceptor; pi

With this award, the Macromolecular, Supramolecular and Nanochemistry Program in the Division of Chemistry is supporting Professor Kirk Schanze at the University of Florida to study the interaction of light with organic and metal-containing semiconducting molecules and polymers with the objective of understanding the fundamental processes that occur when they absorb light energy. A key goal is to understand the role played by electron spin on the properties of the materials. Electron spin state is important as it relates to the interaction of molecules with light because it determines the efficiency in applications such as light-emitting diodes (LEDs) and in solar cells. The effect of metals such as platinum, selenium, and tellurium on the electron spin is also being investigated. The project is being carried out by a team including undergraduate and graduate students with emphasis on participation by underrepresented groups. An international collaboration is included with a group at the King Abdulla University of Science and Technology (KAUST) in Saudi Arabia. The project is expected to have broad impact because the organic semiconductors that are the focus of these studies are being used to develop plastic electronic materials used in flexible light emitting devices and displays, solar cells, sensors and radio frequency ID tags. Thus, the basic science being developed under this grant may have long term implications in technology development for the national health, defense and security sectors.The project will initially involve the chemical synthesis of new semiconducting organic, organometallic and polymeric materials. Second, the properties of the new materials will be characterized by various techniques, including measurement of their light absorption and light emission characteristics. Specifically, pulsed laser techniques will used to understand the time evolution of the intermediate excited states that are formed upon light absorption by these new semiconducting materials. These experiments will be carried out on timescales ranging from picoseconds to microseconds. The results will be interpreted within new or existing physical chemical models, enabling the assignment of the electronic spin state characteristics of these intermediates. This should permit the development of quantitative structure-property relationships which relate the molecular and polymer structure to how the systems interact with light energy. Computational chemistry will be used in specific cases to model the electronic structure of the materials, and this information will aid in the interpretation of the experimental results. Select materials are to be used in prototype device applications, including organic solar cells and field-effect transistor configurations, with the objective of relating the physical chemical information to material device performance. The results of the study are expected to enhance understanding of the optoelectronic properties of donor-acceptor conjugated systems, with a particular focus on the role played by triplet molecular excited states in such systems.

通过该奖项，化学系的大分子，超分子和纳米化学计划支持佛罗里达大学的柯克·施氏教授，研究光的相互作用与有机和金属的半导体分子和聚合物的相互作用，以理解吸收光能时发生的基本过程。 一个关键目标是了解电子旋转在材料特性上发挥的作用。 电子自旋态很重要，因为它与分子与光的相互作用有关，因为它决定了诸如发光二极管（LED）和太阳能电池等应用的效率。 还研究了金属，铂，硒等金属对电子自旋的影响。该项目是由包括本科生和研究生在内的团队进行的，重点是代表性不足的团体。 沙特阿拉伯阿卜杜拉国王科学技术大学（KAUST）的一个团体包括国际合作。预计该项目将产生广泛的影响，因为这些研究重点的有机半导体被用来开发用于柔性光发射设备和显示器，太阳能电池，传感器和射频ID标签的塑料电子材料。 因此，根据该赠款的基础科学可能对国家健康，国防和安全部门的技术开发具有长期影响。该项目最初将涉及新的半导体有机，有机金属和聚合物材料的化学综合。其次，新材料的特性将以各种技术为特征，包括测量其光吸收和光发射特性。 具体而言，脉冲激光技术将用于了解这些新的半导体材料在光吸收后形成的中间激发态的时间演变。 这些实验将在从皮秒到微秒的时间尺度上进行。 结果将在新的或现有的物理化学模型中解释，从而使这些中间体的电子自旋状态特征分配。 这应该允许发展定量结构 - 特性关系，将分子和聚合物结构与系统与光能相互作用的方式相关联。 计算化学将在特定情况下用于对材料的电子结构进行建模，该信息将有助于解释实验结果。精选材料应在原型设备应用中使用，包括有机太阳能电池和现场效应晶体管构型，目的是将物理化学信息与材料设备性能联系起来。 该研究的结果有望增强对供体 - 受体共轭系统的光电特性的理解，并特别关注三胞胎分子激发态在此类系统中所起的作用。