具有AIE特性硅杂环戊二烯分子的TADF性能调控及其在OLED器件中的应用

聚集诱导发光（AIE）在有机电致发光器件（OLED）的性能改造上具有重大的科研意义。近几年，热致延迟荧光(TADF)材料在器件上的应用成为该领域的研究热点。然而,TADF材料的聚集诱导发光猝灭(ACQ)和器件效率滚降的缺点严重阻碍了这类新材料在OLED器件中的市场化应用。研究表明，将AIE技术应用到器件中可以起到简化器件结构、提高器件效率和缓解器件效率滚降等方面的作用。由此可见，建立新的AIE分子并通过分子结构设计来调控TADF性能，拓展AIE材料在TADF器件中的应用是该领域极具挑战性的课题。本项目旨在通过在硅杂环戊二烯AIE基元不同位点中引入不同体系的电子给体和受体基团，通过调控△EST值来实现AIE分子的TADF效应。进一步探索分子结构-电子结构-AIE聚集态结构-TADF性能之间的内在本质。力求解决AIE材料的激子利用率较低的问题,解决TADF OLED器件效率滚降严重的问题。

The aggregation induced emission (AIE) is a phenomenon that is of outstanding importance for the performance modification of organic light-emitting diodes (OLEDs). Thermally activated delayed fluorescence (TADF) has been a hot research topic in market-oriented OLED device applications for a while now. However, when it comes to TADF-OLED devices, the aggregation caused quenching and efficiency roll-off have proven to be decisively unfavorable to the prospective market applications of TADF-OLEDs. Recent advances in academic research reveal that the use of AIE-active based materials can simplify TADF-OLED structure and decrease the efficiency roll-off in them. Thus, incorporating AIE-active building blocks appers to be an efficient way of significantly improving TADF-OLED performance. In this proposal, we suggest to boost TADF-OLED performance by fune-tuning the △EST value of the employed materials by means of appending electron-donating and electron-accepting substituents to the different positions of AIE-active silole molecules, and explore the interrelation between molecular and electronic structures as well as AIE- and TADF- properties with the end goal of perfecting the perfomance of the TADF-OLED devices.