55‐1: <i>Invited Paper:</i> Improving Fluorescent Blue OLEDs Through Advanced Development Approaches in Materials and Device Design

Since 1985, Idemitsu (Idemitsu Kosan Co., Ltd.) has been continuously developing OLED materials centered on fluorescent blue. In addition to materials, performance improvements through device structures have also been pursued. This report reviews Idemitsu's development of fluorescent blue technology and introduces the latest advancements such as Dual EML (stacked emitting layer with high T1 blue host and low T1 blue host), Dual HTL (stacked hole transport layer with high‐n HTL and low‐n HTL), and new blue dopant with narrow FWHM (Full Width at Half Maximum). Additionally, we report on the outcomes of material property prediction using machine learning, which contributed to our recent developments.