|a英文題名:Borylated Compounds Used in Host-Guest System for Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes Application
|a有機發光二極體(organic light emitting diodes, OLEDs)是現在光電產業與學術界的新穎技術之一。近年來，利用過渡金屬錯合物的磷光材料突破以往螢光材料為主的OLEDs元件效率，不過所使用的貴金屬因價格昂貴，以及考慮到礦產資源的匱乏，進而發展出第三代熱活化型延遲螢光 (thermally activated delayed fluorescence, TADF) 為主的OLEDs，於2009年開始迅速成為注目焦點，藉由製作出成本較低廉的有機小分子就能有優異的放光表現，更有潛力達到、甚至超越磷光材料元件效率和穩定性。本論文中，我們利用了硼烷化合物搭配不同的acridan衍生物，藉由中心苯環作為連接基，donor和acceptor鍵結在間位的位向，並合成出一系列的分子，由於結構的擁擠，讓HOMO與LUMO能夠分散還能有稍微的重疊部分，進而得到小的ΔEST以及TADF的效應，以carbazole (CZ)作為donor的一系列分子因為都不具有TADF效應，在本篇我們應用在主體材料上。最後利用光物理、電化學測量以及理論計算探討TADF性質，對硼錯合物的研究進行更深入的了解。|uOrganic light-emitting diodes (OLEDs) are one of the novel technologies in the optoelectronics industry and academia. In recent years, phosphorescent materials using transition metal complexes have broken through the efficiency of OLEDs based on fluorescent materials. Using transition metals are expensive, so developed the third generation of thermally activated delayed fluorescence (TADF)-based OLEDs. Since 2009, it has quickly become the focus of attention. By producing cheaper organic small molecules, it has excellent light-emitting performance and has the potential to achieve or even exceed the efficiency and stability of phosphorescent materials. In this paper, we use borylated compounds with different acridan derivatives. By using a central benzene ring as a linker, donor and acceptor bond in the meta-position and synthesize a series of molecules. Because of the twist structure, there is a slight overlap between HOMO and LUMO, which results in small ΔEST and TADF effects. However the molecules of the carbazole (CZ) series do not have the TADF effect, we apply in the host material. Finally, photophysical, electrochemical measurements and theoretical calculations were used to investigate the TADF properties, and a deeper understanding of boron complexes was conducted and further understanding of the study of boron complexes.
|aBorylated Compounds Used in Host-Guest System for Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes Application