C60於ITO陽極對電洞注入與傳輸之影響

Abstract

有機電激發光二極體(Organic Light Emitting Diode，簡稱OLED)可以說是 二十一世紀平面顯示科技的一大發展主力，但仍然有許多技術上的困難有待突破與改進，因此改善元件的各種特性，包含電壓特性、電流特性、成膜特性及熱穩定性等，都是相當重要的課題。 本論文研究的是有機發光二極體中電洞注入與傳輸之特性。為了使元件有更高的效率，我們可以利用多層結構的OLED構造，設法提升元件之效率。其中一種方式是在陽極蒸鍍一層電洞注入層薄膜，以提升電洞的注入效率。另外也可在電洞傳輸層中加入可以提升電洞傳輸效率的其他材料。 本實驗中將C60以熱蒸鍍的方式在ITO陽極上鍍上一層薄膜，作為電動注入層。我們將設法由實驗結果去探討C60才料對電洞注入效果的影響。 另外，本實驗也嘗試將C60與NPB以共蒸鍍的方式在ITO表面成膜，作為電洞傳輸層使用，藉此來探討C60材料對於電洞傳輸的影響。

Organic light emitting diode (OLED) is one of the most popular technology in the 21 century. However, there are many obstructions needing to be overcome. Therefore, how to improve the performances of organic devices, such as the stability and the current- voltage characteristics, is an important issue. This thesis focuses on the characteristics of hole injection and transport in organic light emitting diodes (OLEDs). In order to improve the performance of organic devices, the multi-layer OLED structure is used. For example, by inserting functional layers, such as an electron injection layer (EIL) and hole injection layer (HIL), the carrier injection can be enhanced. In the experiments, C60 was evaporated on ITO anode as a hole injection layer. Moreover, the devices using the NPB doped with C60 as a hole transport layer are also fabricated to enhance the hole transportation in OLEDs. Therefore, this thesis investigates the effects of C60, as HILs or HTLs in OLEDs.