多氟取代之電子傳輸型材料之合成、性質與元件應用

Abstract

近年來有機發光二極體(OLEDs)的內部量子效率已達100%，然而元件的光取出效率(Out-coupling efficiency)大約只有30%，是 OLEDs 難以達到更高效率的主因。本篇論文利用引入多氟取代在常見的電子傳輸型材料(Electron-Transporting Materials, ETMs)，研究氟原子對於材料性質的影響，其中最重要的是能降低材料的折射率，進而增強共振腔效應，期望達到提升元件效率的目的。在本篇論文中合成出的氟取代電子傳輸型材料的折射率能夠低於 1.7 ，並且能夠改善熱穩定性及調控成為更適合作為電子傳輸型材料的能階。

Over the last few decades, the! internal quantum efficiency (IQE) has alreaedy reached 100% in organic light- emitting diodes (OLEDs). However, the out-coupling efficiency of the device can’t break the limit around 30%. Which is the main reason that we can’t achieve higher external quantum efficiency (EQE). We introduced fluorine atoms to commonly used electron-transporting materials (ETLs), and fully investigated to explore their structure-property-performance relationship. The most important physical property is the reflactive indice of the materials, which can enhance resonator effect between the layers of device and achieve higher EQE. The reflactive indice of the materials we synthesized were lower than 1.7. Furthermore, the introduction of fluorine atoms onto these molecules improved the thermal stability and gave proper energy levels as ETLs.