Excitation-Dependent Multi-State Organic Fluorophores

在这个由化学系化学结构、动力学和机理B计划资助的项目中，佛罗里达州立大学化学和生物化学系的朱磊教授正在开发能够发出超过一个色调的光(即多个发射)以产生复合颜色的新型有机荧光分子。该项目可能导致节能发光材料的出现。这项研究是独一无二的，因为向上或向下拨号输入到该设备的电能可能会导致产生不同的颜色。该项目位于化学、材料和物理的交界处，因此非常适合见多识广的科学家的教育。外展活动包括开发一门关于光的化学和物理的课程，面向STEM学科的高年级本科生和早期研究生。这门新课程旨在加强学生对光相关科学和技术的理解，这门科学和技术现在和将来都处于改善社会福祉和满足好奇心的努力的前沿，为从能源部门到空间探索的广泛领域做出贡献。用更专业的术语来说，这个项目旨在提供结构模型，以产生依赖于激发的双发射荧光团，包括一个有可能进行热激活延迟荧光(TADF)的班级。除了基本的分子光物理学，该研究计划还包括在表征运行中的有机发光二极管(OLED)中有机发射体的稳定性方面的技术创新。在第一个目标中，将确定提供依赖于激发的双发射途径的结构因素。在第二个目标中，将研究一类新的易于制备的有机染料，重点是它们在TADF中的潜力。TADF可以提高OLED的电光转换效率，具有重要的商业价值。同时具有TADF能力和亮度的化合物将被评估为OLED中的发射体。在第三个目标中，第一个目标中描述的激发相关特性将包括在第二个目标中的TADF支架中，以提供明亮、稳定和激发相关的TADF染料，能够双发射。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

In this project funded by the Chemical Structure, Dynamics & Mechanisms B Program of the Chemistry Division, Professor Lei Zhu of the Department of Chemistry and Biochemistry at Florida State University is developing new organic fluorescent molecules that are capable of emitting light of more than one hue (i.e., multiple emission) to produce composite colors. The project could lead to energy-efficient light-emitting materials. The research is unique as dialing up or down the electrical energy input to the device could lead to the production of different colors. This project lies at the interface of chemistry, materials, and physics and is therefore well suited to the education of well-informed scientists. Outreach activities include developing a course on the chemistry and physics of light that targets upper-class undergraduate students and early graduate students in STEM disciplines. The new course aims to enhance the students' understanding of light-involved science and technologies, which is and will be at the forefront of the efforts to improve the well-being, and satisfying the curiosity, of society with contributions to a vast range of areas from energy sectors to space exploration.In more technical terms, this project aims to provide structural models to produce excitation-dependent dual-emitting fluorophores, including one class that has the potential to undergo thermally-activated delayed fluorescence (TADF). Beside fundamental molecular photophysics, the research program also includes technical innovation in characterizing the stability of organic emitters in an operating organic light-emitting diode (OLED). In the first objective, the structural factors that would provide a pathway of excitation-dependent dual emission will be identified. In the second objective, a new class of organic dyes that are easy to prepare will be studied with the focus on their potential for TADF. The ability of TADF may increase the electricity to photon conversion efficiency in an OLED, and is of intense commercial interests. The compounds that are both TADF-capable and bright will be evaluated as emitters in OLEDs. In the third objective, the excitation-dependent properties that are described in the first objective will be included in the TADF scaffolds from the second objective to offer bright, stable, and excitation-dependent TADF dyes capable of dual emission.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.