磷光有機發光二極體：材料及元件的研究

Abstract

本論文分為兩部分，A部分針對非離子型Ru金屬紅色磷光材料之PLED元件性質做討論，B部份針對藍色磷光主發光體材料的合成、性質與元件做討論。 在A部分中，嘗試以一新型中性的Ru紅光材料摻雜進PVK和PF中，製成PLED元件來比較其元件的結果，希望此中性分子在後者的元件表現上能有重要的改善。此外，為了進一步改善元件內電荷的傳輸平衡，進一步將電荷傳輸官能團導入主發光體系統中，以提升元件發光效率及亮度。 在B部分中，以carbazole為主體，在其兩側的3,6位置上以非共軛的方式各導入一個剛硬fluorene基團，希望得到具有電洞傳輸特性且高熱穩定性的藍色磷光主發光體材料。

This thesis is divided into two parts. In part A, we apply a neutral red phosphorescent ruthenium complex in PLED devices. In part B, We report the synthesis and characterization of two new host materials that can be used in blue phosphorescent OLED devices. We also report the fabrication and performance of the devices based on these materials. In part A, we doped a new neutral red Ru complex into either PVK or PF host and fabricated PLED devices based on these blends. We found that this Ru material performs pretty well in both PVK and PF systems. Furthermore, we introduced charge-transport materials/groups into PVK and PF system to improve the device efficiency and brightness. In part B, we have synthesized and characterized two novel host materials with rigid fluorene groups attached at the 3,6 position of a carbazole molecule. The fluorene groups can improve the thermal stability of carbazole while retain the higher T1 (lowest triplet excited state) energy.