本研究は、 JSPS 科研費（基盤研究B, 20H02807）、JST センター・オブ・イノベーションプログラム（COI）の助成を受けたものです。
Title: Tetrapyridine/triphenyltriazine-conjugated electron transporters for low- power-consumption, high-stability phosphorescent OLEDs
By Tomoya Kawano, Hisahiro Sasabe*, Yu Saito, Yuhui Chen, Yuma Kori, Takeru Nakamura, Shoki Abe, Tomohiro Maruyama, Junji Kido
Abstract: The electron transport layer (ETL) is one of the three primary layers for realizing low-power-consumption organic light-emitting devices (OLEDs). However, robust wide- energy-gap ETLs with high thermal and electrical stability have rarely been explored. In this study, we newly designed and developed a series of tetrapyridine/triphenyltriazine-conjugated ETLs, named TnPyTRZ derivatives (n = 2, 3, 4), to realize a low-power-consumption OLED with high operational stability. A green phosphorescent OLED based on T3PyTRZ simultaneously realized a low turn-on voltage (Von) at 1 cd/m2 of 2.18 V, a high external quantum efficiency of over 24%, a high power efficiency of over 115 lm/W, a long lifetime (LT50) of 30000 h at a high brightness of 1000 cd/m2. Even at 1000 cd/m2, the driving voltage was only 2.88 V. This performance is among the best reported to date.