博士修了生 小松龍太郎博士 (Dr. Ryutaro Komatsu) と笹部久宏准教授のトリフェニルアミン含有ベンゾフラン誘導体発光材料群に関する「Bis(triphenylamine)-benzodifuran Chromophores: Synthesis, Electronic Properties and Application in Organic Light-Emitting Diodes」と題する国際共著論文が Frontiers in Chemistry (IF: 5.221) に受理されました！小松博士、おめでとう！本論文はスイスはベルン工科大学の Dr Shi-Xia Liu との国際共同研究です。
Abstract: A series of bis(triphenylamine)benzodifuran chromophores have been synthesized and fully characterised. Starting from suitably functionalized benzodifuran (BDF) precursors, two triphenylamine (TPA) moieties are symmetrically coupled to a central BDF unit either at 4,8-positions through double bonds (1) and single bonds (2) respectively, or at 2,6-positions through double bonds. Their electronic absorption and photoluminescence properties as well as redox behaviour have been investigated in detail, indicating that the p-extended conjugation via vinyl linkers in 1 and 3 leads to comparatively strong electronic interactions between the relevant redox moieties TPA and BDF. Due to intriguing electronic properties and structural planarity, 3a has been applied as a dopant emitter in organic light-emitting diodes. A yellowish-green OLED exhibits a high external quantum efficiency (EQE) of 6.2%, thus exceeding the theoretical upper limit most likely due to energy transfer from an interface exciplex to an emissive layer and/or faborable horizontal orientation of the emitter molecule.
