高效率藍色螢光有機發光二極體之研究

Abstract

本篇論文中包含兩個主題。第一個主題，我們介紹由中研院化學所陳錦地教授團隊所合成的以蒽衍生物為發光層的有機發光二極體。其中，以9,10-bis(3',4',5'-triphenyl-[1,1':2',1''-terphenyl]-4-yl)anthracene (TpbPhAth)為主的無摻雜有機發光二極體，具有最大電流效率為3.6 cd/A，最大功率效率為3.8 lm/W，最大外部量子效率為5.3%，並且伴隨CIE座標(0.153, 0.077)的深藍色放光。透過在TpbPhAth中摻雜天藍色客體材料4,4’-Bis[4-(di-p-tolylamino)styryl]biphenyl (DPAVBi)，有機發光二極體達到最大電流效率為8.5 cd/A，最大功率效率為8.9 lm/W，最大外部量子效率為6.9%。 第二個研究主題中，我們著重在以雙層發光層的結構達到高效率的三重態-三重態融合(TTF)之有機發光二極體，該結構以1,1'-(2,5-Dimethyl-1,4-phenylene)dipyrene (DMPPP) 和 9-(1-naphthalenyl)-10-(4-(2-naphthalenyl)phenyl)anthracene (NPAN)為主體，以7,7,13,13-tetramethyl-N5,N5,N11,N11-tetraphenyl-7,13-dihydrobenzo-[g]indeno[1,2-b]fluorene-5,11-diamine (DPaNIF)為客體。與以DMPPP和NPAN為單層發光層的有機發光二極體相比，雙層發光層的架構因為更有效率的TTF而具有更高的效率表現。經過優化，雙層發光層的有機發光二極體達到最高外部量子效率15.4%，是目前我們已知所有的藍光TTF有機發光二極體中最高的記錄。

There are two topics in this thesis. In the first topic, we demonstrated organic light-emitting diode (OLED) with four anthracene-derivative materials as the emitting layer (EML) which were synthesized by Prof. Chin-Ti Chen’s group, Institute of Chemistry in Academia Sinica. Among them, non-doped OLED based on 9,10-bis(3',4',5'-triphenyl-[1,1':2',1''-terphenyl]-4-yl)anthracene (TpbPhAth) exhibited the maximum current efficiency of 3.6 cd/A, the maximum power efficiency of 3.8 lm/W, and the maximum external quantum efficiency (EQE) of 5.3% with CIE of (0.153, 0.077) at deep-blue emission. With the incorporation of sky-blue dopant, 4,4’-Bis[4-(di-p-tolylamino)styryl]biphenyl (DPAVBi) into the TpbPhAth, the OLED achieved maximum current efficiency of 8.5 cd/A, maximum power efficiency of 8.9 lm/W, and maximum EQE of 6.9%. In the second topic, we focused on achieving high efficiency triplet-triplet fusion (TTF) OLED based on double-EML structure, which was composed of 1,1'-(2,5-Dimethyl-1,4-phenylene)dipyrene (DMPPP) and 9-(1-naphthalenyl)-10-(4-(2-naphthalenyl)phenyl)anthracene (NPAN) as the host and 7,7,13,13-tetramethyl-N5,N5,N11,N11-tetraphenyl-7,13-dihydrobenzo-[g]indeno[1,2-b]fluorene-5,11-diamine (DPaNIF) as the dopant. Compared with the DMPPP- and NPAN-based OLEDs, the double-EML structure exhibited the higher efficiency because of efficient TTF. After optimization, the double-EML OLED with the maximum EQE of 15.4% was obtained which is the highest record among all blue TTF-OLEDs to our best knowledge.