有機發光元件於顯示器與照明應用之結構設計研究

Abstract

在此論文中，我們研究數種新型有機發光元件結構，並用以增進有機發光元件於顯示和照明應用上之性能。論文的第一部分主要針對顯示應用相關之有機發光元件。首先，研究純藍光磷光有機發光元件在效率上的提升，透過適當的元件架構設計，我們成功的製作出一系列高效率含銥磷光材料的純藍光有機發光元件。其次，我們研究具有微共振腔結構之白光有機發光元件，用以簡化全彩有機發光顯示器之製程及提高色彩表現。 論文的第二部分主要針對照明應用之白光有機發光元件。首先，我們利用具有多重功能之鋨化合物來研製高效率及具有色彩穩定性之全磷光白光有機發光元件。其次，我們研究利用磷光敏化方式製作白光元件，用以減緩在燐光元件中常見來自三重態-三重態焠熄所產生的效率降低現象。最後，為實現照明的要求，我們針對白色有機發光元件的演色能力來進行改善，透過使用新穎的磷光材料和元件架構設計，我們發展二種不同架構的白光有機發光元件，其演色性皆分別大於80和90。

In this thesis, we investigate several device architectures of organic light-emitting devices (OLEDs) to enhance the device performances for display and lighting applications. The first part of the thesis is discussing OLEDs for display applications. First, we focused on the true-blue phosphorescent OLEDs. Through careful architecture designs, true-blue phosphorescent OLEDs based on a series of true-blue iridium phosphors were developed. Then, we combined white OLEDs (WOLEDs) and pixilated microcavity structures to simplify the display manufacturing process and improve the color performances. The second part of the thesis is discussing WOLEDs for lighting applications. First, the multifunctional osmium complex was used to fabricate efficient all-phosphor doped WOLEDs with high color stability. Then, by utilizing the phosphorescent sensitization to fabricate WOLEDs, the common phenomenon of significant efficiency roll-off resulted from triplet-triplet annihilation in phosphorescent OLEDs could be mitigated. Finally, to attain the requirement of illumination, we focused on the improvement of color rendering ability of WOLEDs. Two types of WOLEDs were developed through employing the novel phosphors and device architecture designs. Within a wide luminance range, the Color Rendering Index (CRI) was maintained larger than 80 and 90 for two types WOLEDs, respectively.