Bis(Triphenylamine)Benzodifuran Chromophores: Synthesis, Electronic Properties and Application in Organic Light-Emitting Diodes

Frontiers in Chemistry

Bilal Özen¹  Shi-Xia Liu¹  Jürg Hauser¹  Silvio Decurtins¹  Songjie Chen¹  Hui Li¹  Hisahiro Sasabe²  Ryutaro Komatsu²  Junji Kido²  Latevi Max Lawson Daku³  Jihane Hankache³  Andreas Hauser³ 

[1] Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Bern, Switzerland;Department of Organic Device Engineering Research Center for Organic Electronics, Yamagata University, Yamagata, Japan;Department of Physical Chemistry, University of Geneva, Geneva, Switzerland;

关键词: benzodifuran;    triphenylamine;    spectroelectrochemistry;    optical spectroscopy;    organic light-emitting diode;   

DOI  :  10.3389/fchem.2021.721272

来源: DOAJ

【 摘 要 】

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 (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.

【 授权许可】

Unknown