Li, HuiHuiLiKomatsu, RyutaroRyutaroKomatsuHankache, JihaneJihaneHankacheSasabe, HisahiroHisahiroSasabeLawson Daku, Latevi MaxLatevi MaxLawson DakuÖzen, BilalBilalÖzenChen, SongjieSongjieChenHauser, JürgJürgHauserHauser, AndreasAndreasHauserDecurtins, SilvioSilvioDecurtinsKido, JunjiJunjiKidoLiu, Shi-XiaShi-XiaLiu0000-0001-6104-43202024-09-022024-09-022021-07-21https://boris-portal.unibe.ch/handle/20.500.12422/42768A 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 (3). Their electronic absorption and photoluminescence properties as well as redox behaviour have been investigated in detail, indicating that the π-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 favorable horizontal orientation.en500 - Science::570 - Life sciences; biology500 - Science::540 - Chemistryarticle10.48350/15768010.3389/fchem.2021.721272