Development of Neo-Technology for Fabrication of Him Display Based on Organic light-Emitting Diodes

研究了用PEDOT材料代替ITO和无机电极代替阴极金属制备透明电极及其在有机电致发光二极管(OLED)中的应用。添加剂的加入提高了PEDOT材料的导电性。然而，导电性的增加被认为是由于导电聚合物分子的分子聚集和/或形态造成的。通过大气紫外光电子分析仪(AC-2；Riken Keiki Co.Ltd.)，观察了PEDOT材料表面态电离电势随不同制备方法和不同热处理的变化。特别是，由于PEDOT材料的电离势随着氧化的进行而增加，表面氧化改善了ITO与空穴传输材料之间的能量匹配。电离势的变化很容易发现是由于AC-2的组成发生了变化。我们再次确认了AC-2的有效性，我们发现有机材料的电离势可以通过不同的表面处理来控制。为了实现高效的载流子注入，我们证明了通过易于使用的表面处理可以实现电极和有机材料之间的最佳电荷转移的能量匹配。我们尝试将GaN和碳纳米管应用于阴极而不是金属。然而，在电极上制备有机薄膜是很困难的。我们还没有成功地制造出OLED。

We investigated the fabrication of transparent electrode using PEDOT material instead of ITO and inorganic electrode instead of cathode metal, and their application to organic light-emitting diode(OLED). The addition of some additives led to the increase in electrical conduction of PEDOT material. However, the increase in the electrical conduction is thought to be caused by the molecular aggregation and/or morphology of conducting polymer molecules. We intend to stick at the estimation of detailed film morphology.By mean of an atmosphere ultraviolet photoelectron analysis device (AC-2;Riken Keiki Co.Ltd), the change in ionization potential of the surface state of PEDOT material was observed accompanied by the different fabrication method and annealing. Especially, since the ionization potential of PEDOT material increased with proceeding oxidation, the surface oxidation improved the energy matching between ITO and hole transport material. The change in ionization potential is easily found to be due to the change of composition by AC-2. We reconfirmed the availability of AC-2.We found the ionization potential of organic material can be controlled by various surface treatment. To achieve highly efficient carrier injection, we showed the energy matching for optimal charge transfer between electrode and organic material can be realized by easy-to-use surface treatment.We tried to apply GaN and carbon nanotubu to cathode instead of metal. However, it is difficult to fabricate organic thin film on the electrodes. We have not succeed the fabrication of OLED yet.