Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3574
標題: 含咔唑發光團基之高效能深藍光有機電激發光材料合成及其電激發光特性研究
Synthesis and Characterization of High Performance Deep Blue Light Emitting Materials Based on Carbazole Derivatives
作者: 陳興達
Chen, Shing-da
關鍵字: Carbazole
有機電激發光元件
Stilbene
Blue Light Emitting Materials
OLED
Styryl-Carbazole
藍光有機電激發光材料
二苯乙烯
咔唑
出版社: 化學工程學系所
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摘要: 本論文研究是要合成出以咔唑為發光主體之一系列有機電激發光材料。經由 Wittig 反應,合成出以二苯乙烯(stilbene)官能基當做連接咔唑的共軛結構、藉以增長共軛長度;並利用Pd觸媒與 n-BuLi 之偶合反應,引入不同末端團基 (aromatic amine, triphenylsilane, 及 anthracene),分別合成出三個以咔唑為主體之三種有機電激發光材料 (Cz-NPh、Cz-SiPh 與 Cz-Ph3)。熱性質分析顯示 Cz-NPh、Cz-SiPh與Cz-Ph3之裂解溫度分別為315、311和293 oC,玻璃轉化溫度分別為 89、80 和69 oC。Cz-NPh、Cz-SiPh與Cz-Ph3 在四氫氟喃溶劑中所得之最大紫外-可見光吸收波長分別為 351、346和391 nm。三種發光材料之最大螢光放射波長分別為447、410和505 nm。螢光放光顏色除了Cz-Ph3為綠色之外,其餘皆為藍色。有機電激發光元件以氧化銦錫(ITO)為陽極、鋁(AL)為陰極、LiF 為緩衝層,大致分為三類型元件。第一類型元件以Cz-NPh為發光層、改變不同電子傳輸層(Alq3、TPBI),探討電子傳輸層對元件之影響。第二類型元件以TPBI當電子傳輸層、改變發光層(Cz-NPh、Cz-SiPh與Cz-Ph3)期望得到色純度好高效率藍光材料。第三類型元件以Cz-SiPh為發光層、改變電洞傳遞層(NPB)厚度,調整電子與電洞再結合區域。其中以Cz-NPh為發光層,使用TPBI作為電子傳遞層,所製作而成之電激發光元件其最大放光波峰約為456 nm、半高波峰寬為64nm、色度座標 CIEx,y (0.14,0.09)、發光亮度最大值8207cd/m2、發光效率1.7~2.0 cd/A (0.8~1.2 lm/W),外部量子效率2.3%。以Cz-NPh為發光層所製備之元件,具有高亮度、高效率與高色純度之藍光電激發光等特性。
A series of stilbene substituted carbazole based organic light emitting materials have been synthesized in this study. The carbazole based organic light emitting materials consist of a carbazole core, stilbene unit and three kinds of terminal groups. The 3-position of the carbazole and stilbene unit are combined by the Wittig reaction. Terminal groups of aromatic amine, triphenylsilane covalenty incorporated into styryl-carbazole moiety by palladium-catalyzed coupling reaction and bromide-lithium exchange reaction, respectively. These three organic light emitting materials(aromatic amine containg Cz-NPh, triphenylsilane containg Cz-SiPh and anthracene containg Cz-Ph3) exhibit moderate glass transition temperatures in the range of 69-89 oC, where as the thermal decomposition temperatures are ranged from 293 oC to 315 oC. The maximal UV-Vis absorptions (λmax) of Cz-NPh, Cz-SiPh and Cz-Ph3 were observed at around 351nm, 344, and 391nm, respectively, which are attributed to the π-π* transition of the conjugated segments. On the other hand, the maximal photoluminescences are observed at 447, 410, and 505 nm for the Cz-NPh, Cz-SiPh and Cz-Ph3, respectively. In addition to the green emission of Cz-Ph3, bright blue emissions were observed for the Cz-NPh and Cz-SiPh. High brightness (8207 cd/m2), large power efficiency (1.7~1.9cd/A or 0.8~1.2lm/W), high external quantum efficiency (2.3%), and good color purity CIEx,y(0.14, 0.08) were observed for the Cz-NPh based organic light emitting device.
URI: http://hdl.handle.net/11455/3574
其他識別: U0005-1907200617393900
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1907200617393900
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