Design and synthesis of fast kRISC MR-TADF emitters: merge of cycloparaphenylene materials and B,O doped MR-TADF emitters (CPP-MR-TADF)

快速 kRISC MR-TADF 发射器的设计和合成：环对亚苯基材料和 B,O 掺杂 MR-TADF 发射器的合并 (CPP-MR-TADF)

• 批准号: EP/Y01037X/1
• 负责人: Eli Zysman-Colman
• 金额: $ 23.84万
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FY01037X%2F1
• 关键词: Design; synthesis; fast; kRISC; MR

Organic light-emitting diodes (OLEDs) are nowadays omnipresent in the form of display screens in mobile phones and smartwatches. Although already commercialized, this technology still possesses shortcomings. For instance, OLEDs use scarce noble metals like iridium as emitters for the red and green pixels of the display, making the technology in its present form not sustainable. Introduced for the first time in 2015, multiresonant thermally activated delayed fluorescence (MR-TADF) emitters, which are organic compounds, allow to produce OLEDs at comparable efficiency and color point to phosphorescent OLEDs, but are sustainable. However, OLEDs with MR-TADF materials presently suffer from a too high efficiency roll-off related to the slow reverse intersystem crossing rate (kRISC), strong intermolecular interactions/aggregation that cause emission quenching, and poor charge transport properties. This project proposes the development of a new class of luminescent materials that brings together facets of MR-TADF emitters and cycloparaphenylene (CPP) materials. CPPs are pure hydrocarbon organic semiconductors that possess a cylindrical geometry, which strongly limits intermolecular interactions in the solid state. This fundamental proposal explores the theoretical modelling, synthesis, and optoelectronic characterization of a family of hybrid CPP-MR-TADF materials as potential emitters for OLEDs. The proposed multidisciplinary strategy aims to provide a sought-after solution to increasing kRISC in MR-TADF materials while also addressing issues of charge transport in the emissive layer and the propensity for these molecules to undesirably aggregate.

如今，有机发光二极管（OLEDS）以移动电话和智能手表的显示屏形式无处不在。尽管已经商业化，但该技术仍然存在缺点。例如，OLEDS使用稀缺的贵金属（例如Iridium）作为展示的红色和绿色像素的发射器，使该技术以目前的形式不可持续。在2015年首次引入的是有机化合物的多辅音热激活的延迟荧光（MR-TADF）发射剂，可以以可比的效率和磷光OLED的色点产生OLED，但可持续。然而，目前使用MR-TADF材料的OLED遭受与慢速逆向间间交叉速率（KRISC），强烈的分子间相互作用/聚集的效率过高的滚动，导致发射淬火和电荷运输特性不良。该项目提出了一种新的发光材料的开发，该材料将MR-TADF发射器和环苯基苯基材料（CPP）材料汇总在一起。 CPP是具有圆柱形几何形状的纯烃有机半导体，它极大地限制了固态中分子间相互作用。这项基本建议探讨了理论建模，合成和光电特征，将杂种CPP-MR-TADF材料家族作为OLED的潜在发射器。拟议的多学科策略旨在为提高MR-TADF材料中的Krisc提供一种寻求的解决方案，同时还解决了发射层中电荷运输问题的问题，以及这些分子倾向的倾向是不受欢迎的聚集物。