22.2: Invited Paper: New HBL Development for High Efficiency and Long Lifetime of Blue OLED Device

Abstract

We were able to improve properties of blue organic light-emitting diode (OLED) device by inserting new Hole Blocking Layer (HBL) between Emitting Layer (EML) and Electron Transport Layer (ETL). It was possible to improve properties of such blue device by using new HBL that has high electron mobility and that can block the holes at the same time. The fluorescent blue device that used new HBL-1 and HBL-2 showed very high efficiency: At 500 cd/m 2 , pure blue color coordinate (0.135, 0.108) and efficiency of 9.5 cd/A. On the other hand, fluorescent blue device that used HBL-1 showed efficiency of 9.3 cd/A at pure blue color coordinate (0.134, 0.109), showing 50% lifetime increase as well. Objective and backgroundAMOLED display advanced rapidly, succeeding in commercialization with a small size in 2007. Recently, AMOLED has been rapidly expanding its application scope to include TV, lighting, and Flexible Display, with products being put on the market.

85‐1: Invited Paper: A Novel OLED Material Discovery based on AI Technology

“…We introduce an application case of TADF emitters designed based on the entire process above. It was experimentally verified that AI-designed TADF emitter with improved transition state stability [9] and reduced dexter energy transfer rate [10] had 20% lifetime improvement compared to a reference emitter. We will continue to update the process and system, and hope that the system will accelerate the development of highly efficient and durable materials.…”

Organic Light-Emitting Diodes (OLEDS)

“…However, it should not reduce the band gap and thus the HOMO level of the material. Kim et al reported that a blue fluorescent OLED with a newly developed HBL material achieved an efficiency of 9.5 cd/A at 500 cd/m2 with a color coordinate of (0.135, 0.108) (Kim et al 2015).…”