M2 年眞遥生君と笹部久宏准教授の低消費電力・長寿命緑色有機ELを実現するπ拡張フェノキサジン誘導体 MR-TADF 材料群の論文が Wiley の Adv. Opt. Mater. (IF: 8.0) に受理されました！年眞、おめでとう！本論文は山形大学のサポートを受け、オープンアクセス論文となっています。
本研究は、JSPS 科研費（基盤研究B 23H02032）、NEDO 官民による若手研究者発掘支援事業 (21502128-0) の助成を受けたものです。
Title: π-Extended Phenoxazine-Based Asymmetric MR-TADF Emitters for Narrow Emission Band Green OLEDs with a Power Efficiency of 150 lm/W, an EQE of 27%, and an LT95 of over 3000 hours at 1000 cd/m2
By Haruki Nemma, Yuma Kori, Naoki Meguro, Ryunosuke Mimura, Yudai Chiba, Junji Kido, and Hisahiro Sasabe*, Adv. Opt. Mater. accepted.
Abstract: Although multi-resonance thermally activated delayed fluorescent (MR-TADF) emitters simultaneously achieve high color purity and high efficiency in organic light-emitting devices (OLEDs), MR-TADF-based OLEDs suffer from severe efficiency roll-off and lifetime issues for practical application. To overcome these issues, a key solution is hyper OLED technology sensitized by TADF or phosphorescent emitters. In this study, we developed a series of π-extended phenoxazine-based asymmetric MR-TADF emitters for long lifetime, low-power consumption, and narrow emission band green OLEDs. As a sensitizer, we used a well-known phosphorescent emitter, fac-tris(2-phenylpyridinato-C2,N)iridium(III) [Ir(ppy)3]. Consequently, these MR-TADF emitters achieve hyper OLEDs with a power efficiency of 150 lm/W, an external quantum efficiency of 27%, and a long lifetime LT95 of over 3000 hours at high brightness of 1000 cd/m2. These performances are among the best in scientific literature.
