D3 陳宇輝君、佐野健志教授、笹部久宏准教授の「長寿命有機ELを実現する大気安定な非フェナントロリン系陰極材料」の論文が RSC の J. Mater. Chem. C (IF: 5.7) に受理されました！陳、おめでとう！本研究は山形大学片桐研究室との共同研究です。片桐先生、佐藤くん、ご協力ありがとうございました。
本研究は、JST SICORP (JPMJSC2007)、JSPS 科研費（基盤研究B 23H02032 and 23K26725）の助成を受けたものです。
Abstract: Although organic light-emitting devices (OLEDs) have been commercialized for display applications, electron-injection layers (EILs) still relied on alkali metals or their compounds to lower driving voltages, and hence reactivity with atmospheric moisture is a primary concern, especially in flexible devices. As an alternative strategy, combining electron transport materials (ETMs) based on 1,10-phenanthroline (Phen) derivatives with silver (Phen/Ag) has attracted much attention for developing air-stable EILs. However, most studies have focused on Phen derivatives. Herein, we developed a non-Phen ETM named DPmPy-BP based on 2,6-di(pyrimidin-2-yl) pyridine skeleton. Combined with Ag (DPmPy-BP/Ag) as a potentially air-stable EIL, this ETM exhibited superior electron-injection properties and remarkable stability in preliminary green phosphorescent OLEDs achieving a maximum external quantum efficiency (EQE) of 20% and an operational lifetime (LT50) of approximately 17,000 hours at 1000 cd m-2, which surpass those of Phen/Ag devices and are comparable to devices using a conventional alkali metal compound 8-hydroxyquinolinolato-lithium (Liq) as the EIL (DPmPy-BP/Liq).
