城戸・笹部・千葉研究室M2 阿部翔希君と笹部久宏准教授の長寿命TADF有機ELを実現する高い堅牢性をもつテトラジベンゾフラン誘導体ホール輸送材料群に関する論文が英国化学会 (Royal Society of Chemistry, RSC) の Molecular Systems Design & Engineering (MSDE) (IF: 4.920) に受理されました。
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:  Effect of Substitution Position of Dibenzofuran-terminated Robust Hole- transporters on Physical Properties and TADF OLED Performances
By Shoki Abe, Hisahiro Sasabe,* Takeru Nakamura, Misaki Matsuya, Yu Saito, Takanori Hanayama, Suguru Araki, Kengo Kumada, and Junji Kido*, Mol. System Design Eng. 2022, accepted.

Abstract: Although the wide-energy-gap hole-transport layer (HTL) is a key material to realizing high-efficiency and long-lifetime phosphorescent and thermally activated delayed fluorescent (TADF) organic light-emitting devices (OLEDs), a limited number of HTLs have been explored in previous studies. Accordingly, dibenzofuran-end-capped HTLs show promising performance in realizing a maximum external quantum efficiency (EQE) of 20% and a long lifetime of over 20000 h at 1000 cd/cm2 in phosphorescent and TADF OLEDs. This study investigates the effects of the substitution positions of TnDBFBP (n=1–4) derivatives with four DBF-end-capping groups to extensively study the molecular design of robust multifunctional HTLs. TnDBFBP derivatives exhibited a high glass transition temperature (Tg) of ~149 ̊C, triplet energy (ET) value of ~2.9 eV, and anionic bond dissociation energy of ~1.75 eV depending on the substitution positions. Consequently, T1DBFBP realized green TADF OLEDs with an EQE of over 20% and an operational lifetime of 50% of the initial luminance (LT50) of 30000 h at 1000 cd/m2. These performances are among the best reported by previous studies.

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