以吖啶咔唑衍生物製作藍色熱活化延遲螢光放光有機發光二極體之研究

Abstract

本篇論文中包含三個主題。第一個主題，我們介紹由化學所梁文傑教授團隊所合成的吖啶-咔唑-嘧啶的衍生物為天藍色熱活化延遲螢光（thermally activated delayed fluorescence, TADF）發光體的有機二極體。其中，以10-(3,5-di(9H-carbazol-9-yl)-4-(pyrimidin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (4Ac35CzPy), 10-(2,5-di(9H-carbazol-9-yl)-4-(pyrimidin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (4Ac25CzPy) 作為發光體，摻雜於9,9'-(2-(1-Phenyl-1H-benzo[d]imidazol-2-yl)-1,3-phenylene)bis(9H-carbazole) (o-2CbzBz) 形成發光層的有機二極體中，達到了最大電流效率為50.4 cd/A;最大功率效率為45.3 lm/W;以及最大外部量子效率（external quantum efficiency, EQE）為21.2%的元件表現。 第二個主題，我們介紹由化學所梁文傑教授團隊所合成的以吖啶-咔唑的衍生物為發光層主體材料的有機二極體。其中，以透過在10-(3,5-di(9H-carbazol-9-yl)-4-(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (4Ac26CzBz)摻雜天藍色的熱活化延遲螢光客體材料2,3,5,6-tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl)benzonitrile (4TCzBN)，有機發光二極體達到最大電流效率為59.84 cd/A，最大功率效率為62.84 lm/W，最大外部量子效率為35.78%，是目前我們已知此材料所有的以4TCzBN為客體材料有機發光二極體中最高紀錄。

There are three topics in this thesis. In the first part, acridine-carbazole-imidazole derivatives, 10-(3,5-di(9H-carbazol-9-yl)-4-(pyrimidin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (4Ac35CzPy) and 10-(2,5-di(9H-carbazol-9-yl)-4-(pyrimidin-2-yl)phenyl)-9,9-dimethyl-9,10-dihydroacridine (4Ac25CzPy), provided by Prof. Man-Kit Leung’s group, Department of Chemistry in National Taiwan University, were used as blue thermally activated delayed fluorescence (TADF) dopants in the 9,9'-(2-(1-Phenyl-1H-benzo[d]imidazol-2-yl)-1,3-phenylene)bis(9H-carbazole) (o-2CbzBz) host as the emitting layer (EML) of the organic light-emitting diodes (OLEDs), which reached the maximum current efficiency, power efficiency, and external quantum efficiency (EQE) of 50.4 cd/A, 45.3 lm/W, and 19.7%, respectively. In the second part of this thesis, 10-(3,5-di(9H-carbazol-9-yl)-4-(1-phenyl-1H-benzo[d]imidazol-2-yl) phenyl)-9,9-dimethyl-9,10-dihydroacridine (4Ac26CzBz), provided by Prof. Man-Kit Leung’s group, Department of Chemistry in National Taiwan University, was utilized as host material doped with the sky-blue thermally activated delayed fluorescence (TADF) dopant, 2,3,5,6-tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl) benzonitrile (4TCzBN) as the EML of the OLED. By adjusting the device structure, maximum current efficiency, power efficiency, and EQE of 59.84 cd/A, 62.83 lm/W, and 35.78% were achieved, respectively, which are the highest efficiencies among all the 4TCzBN-based OLEDs, to our best knowledge.