Development of New Organic Electronic and Optoelectronic Materials

新型有机电子光电材料的开发

• 批准号: RGPIN-2022-03782
• 负责人: Zhao, Yuming
• 金额: $ 2.11万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748178
• 关键词: Development; New; Organic; Electronic; Optoelectronic

Luminescent materials have important applications in sensing, bioimaging, theranostics, and light-emitting technologies. Development of functional fluorophores is at the heart of these cutting-edge research fields. Built upon our previous studies, we propose to investigate new organic luminescent materials based on innovative molecular design and synthesis. The first class of materials are called AIE-active interpenetrating network (IPN) hydrogels. AIE stands for "aggregation-induced emission". An AIE fluorophore is non-emissive when molecularly dissolved, but highly emissive upon aggregation. IPN hydrogels are blends of two or more hydrogel polymers interlaced with one another, which show significant advantages in terms of mechanical stability, high adsorbent performance, and sensitive responsiveness to external stimuli. In our studies, we will synthesize various AIE fluorophores chemically bonded to the frameworks of IPN hydrogels. The AIE fluorophores act as "nodes" to cross-link with the hydrogel networks, and are expected to display versatile fluorescence properties in response to various external stimuli. The proposed AIE-active IPN hydrogels will be developed into "intelligent" fluorescent materials for environmental sensing, bioimaging, and other fluorescence applications. The second class of fluorophores to be investigated are called TADF fluorophores. TADF refers to "thermally activated delayed fluorescence". TADF fluorophores have attracted enormous attention in recent years owing to their unique advantages of long-lived delayed fluorescence and high internal quantum efficiency. TADF materials have been popularly explored as next-generation emitters for organic light-emitting devices (OLEDs), as well as bioimaging and photocatalysis. Our proposed research will target pyrene-based purely organic fluorophores, which will be synthesized, characterized and then optimized for light-emitting and fluorescence imaging applications. Apart from various new flurophores, we will also investigate an unprecedented class of functionalized "carbon nanobelts" (CNBs). CNBs possess fascinating molecular structures and electronic properties, akin to their larger analogues - carbon nanotubes. CNBs were conceptually proposed as early as 1954, but have only been successfully synthesized in the past three years. To contribute to this challenging but quickly growing field, we propose to construct a new type of functionalized CNBs, using bromine-substituted quinodimethane (QMD) as a key building component. Our synthetic strategy is to connect two curved QMD-embedded nanostrips to form a belt via efficient cycloaddition reactions. A key advantage of such CNBs is that various redox-active functional groups can be readily installed on their edges to bring about redox controllability and supramolecular self-assembling properties. Fundamental properties and applications of the CNBs and related nanocarbon materials will be explored in our studies.

发光材料在感应，生物成像，疗法和发光技术方面具有重要的应用。功能性荧光团的发展是这些尖端研究领域的核心。基于我们先前的研究，我们建议根据创新的分子设计和合成研究新的有机发光材料。第一类材料称为AIE活性互穿网络（IPN）水凝胶。 AIE代表“聚集引起的排放”。当分子溶解时，AIE荧光团是非发射的，但在聚集时高度发射。 IPN水凝胶是两个或多个水凝胶聚合物相互隔离的混合物，在机械稳定性，高吸附性能和对外部刺激的敏感反应性方面，它们具有显着优势。在我们的研究中，我们将合成各种AIE荧光团化学结合到IPN水凝胶的框架。 AIE荧光团充当与水凝胶网络交联的“节点”，并有望响应各种外部刺激而显示多功能荧光性能。所提出的AIE-Active IPN水凝胶将被发展为“智能”荧光材料，用于环境传感，生物成像和其他荧光应用。要研究的第二类荧光团称为TADF荧光团。 TADF是指“热激活的延迟荧光”。近年来，TADF荧光团引起了极大的关注，这是由于它们具有长期延迟荧光和高内部量子效率的独特优势。 TADF材料通常被探索为有机发光设备（OLED）以及生物成像和光催化的下一代发射器。我们提出的研究将针对基于吡啶基的纯有机荧光团，该研究将被合成，表征并进行优化，以发光和荧光成像应用。除了各种新的flurophores外，我们还将研究一类官能化的“碳纳米物质”（CNB）。 CNB具有引人入胜的分子结构和电子特性，类似于它们的较大类似物 - 碳纳米管。 CNB早在1954年就在概念上提出，但仅在过去三年中才成功合成。为了促进这个具有挑战性但迅速发展的领域，我们建议使用溴取代的奎诺二甲烷（QMD）作为关键建筑物组件来构建一种新型的功能化CNB。我们的合成策略是连接两个弯曲的QMD固定纳米带，通过有效的环加成反应形成皮带。这种CNB的关键优势是，可以轻松地安装各种氧化还原活性官能团，以带来氧化还原可控性和超分子自组装特性。我们的研究将探讨CNB和相关纳米碳材料的基本特性和应用。