城戸・笹部・千葉研究室M2 齋藤優君と笹部久宏准教授の長寿命深赤色有機ELを実現するキノリン修飾フェナントロリン誘導体電子輸送材料群に関する論文が日本化学会の Bull Chem Soc JPN (IF: 5.121) に受理されました。
本研究は、 JST SICORP (JPMJSC2007)、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: Quinoline-modified phenanthroline electron-transporters as n-type exciplex partners for highly efficient and stable deep-red OLEDs
By Yu Saito, Hisahiro Sasabe,* Hisaki Tsuneyama, Shoki Abe, Misaki Matsuya, Tomoya Kawano, Yuma Kori, Takanori Hanayama, Junji Kido*, Bull. Chem. Soc. JPN 2022, accepted.
Abstract: Although stable deep-red organic light-emitting devices (OLEDs) exhibit potential applications as unique illumination light sources for plant growth and in health monitoring systems, their electron-to-photon conversion efficiency, represented by the external quantum efficiency (EQE), is significantly lower than that of the other primary colors. Thus, to overcome this limitation, n-type exciplex host partners based on quinoline-modified phenanthroline derivatives, X-BPhen, were designed and synthesized in this study. These X-BPhen derivatives formed exciplexes on combination with a p-type host material, NPD, behaving as host materials in deep red phosphorescent OLEDs. The corresponding devices exhibited a maximum EQE of 17.6%, with CIE coordinates of (0.71, 0.29), and an LT80 of 410 h at a constant current density of 25 mA/cm2; this is among the best performances reported for stable deep-red OLEDs.