IRES Track 1: Self-assembled liquids and thin films for efficient photon upconversion with triplet excitons in air

IRES 轨道 1：自组装液体和薄膜，用于空气中三线态激子的高效光子上转换

• 批准号: 2142762
• 负责人: Ming Tang
• 金额: $ 30万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2142762&HistoricalAwards=false
• 关键词: IRES; Track; Self; assembled; liquids

The scientific goal of this IRES is to gain better understanding for the fabrication of air-stable, photon upconversion thin films or liquids that can operate efficiently with diffuse sunlight, without the need of volatile organic solvents that currently limit practical use in applications. Complete immersion in Japanese society by spending four to eight weeks in Kyushu University will provide an opportunity to experience and understand the people, traditions and culture. The cultural and scientific exposure that the U.S. students will obtain from this international collaboration will be invaluable. Kyushu University is one of the top-ranked universities in Japan, and the cosmopolitan metropolis of Fukuoka is welcoming to foreigners. This opportunity is expected to enhance the global competitiveness of the participating students in the STEM workforce, and will be made available to qualified U.S. students, especially those underrepresented in science and engineering, by broadly reaching out to the California State university system, the Univ. of California system, and students attending professional conferences organized for example, by the American Chemical Society and Materials Research Society.In this international collaboration, four U.S. undergraduate and/ or graduate participants per year will perform fundamental research on triplet-fusion based photon upconversion both in California and Japan. The fusion of molecular excited states with triplet character is the only method for directly upconverting photons from the sun. While these high photon upconversion quantum yields have been demonstrated in volatile organic solvents, they are generally lower in thin film due to poor triplet exciton diffusion. The U.S. students will be synthesizing and fabricating liquid or thin-films of semiconductor nanocrystals and molecular emitters organized in various hosts, including proteins, organogels and surfactants, to understand and control the diffusion of photogenerated triplet excitons. This project aims to use semiconductor nanocrystals to absorb light strongly in the near-infrared wavelengths to address one of the major limitations in molecular triplet photosensitizers. The hybrid nanomaterials will be designed to halt the spontaneous crystallization of the molecular emitter with nitrene crosslinking chemistry; increase triplet diffusion lengths in liquids or thin films with long-range order in covalent organic frameworks and establish a barrier to oxygen to prevent the quenching of spin-triplet excitons.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

此IRES的科学目标是为制造空气稳定的，光子上转化薄膜或液体的制造获得更好的理解，这些薄膜或液体可以在弥漫性阳光下有效运行，而无需挥发性有机溶剂，这些有机溶剂当前限制了在应用中的实际使用。 在九州大学度过四到八周，将完全沉浸在日本社会中，将为体验和理解人们，传统和文化提供机会。美国学生将从这项国际合作中获得的文化和科学风险将是无价的。京都大学是日本排名最高的大学之一，福冈大都会都欢迎外国人。预计这一机会将增强STEM劳动力中参与学生的全球竞争力，并将通过与加利福尼亚州立大学系统（Univ）广泛接触，向合格的美国学生，尤其是那些在科学和工程领域的人数不足的学生提供。加利福尼亚系统以及参加专业会议的学生（例如由美国化学学会和材料研究协会举办的。在加利福尼亚和日本。分子激发态与三重态特征的融合是直接从太阳上转换光子的唯一方法。尽管这些高光子上转换量子的产量已在挥发性有机溶剂中证明，但由于较差的三胞胎激子扩散，它们在薄膜中通常较低。美国学生将合成和制造半导体纳米晶体和分子发射剂的液体或薄膜，这些宿主组织在包括蛋白质，有机凝胶和表面活性剂在内的各种宿主中，以理解和控制光生成三重激体的扩散。该项目旨在使用半导体纳米晶体在近红外波长中强烈吸收光线，以解决分子三重态光效应器的主要局限性之一。杂化纳米材料将设计为停止使用硝基交联化学的分子发射极的自发结晶；增加在共价有机框架中具有远距离顺序的液体或薄膜中的三胞胎扩散长度，并建立氧气的障碍，以防止淬火旋转三键式激子。这奖反映了NSF的法定任务，并被认为是通过使用评估值得的支持基金会的智力优点和更广泛的影响审查标准。