CBP derivatives dendronized self-host TADF dendrimer: Achieving efficient non-doped near-infrared organic light-emitting diodes

• Published in: Dyes and pigments 2017-12, Vol.147, p.436-443
• Main Authors: Sun, Kaiyong, Sun, Yibai, Liu, Dan, Feng, Yingli, Zhang, Xusheng, Sun, Yueming, Jiang, Wei
• Format: Article
• Language: English
• Subjects: Bipolar; Dendrimer; Near-infrared; OLEDs; Solution-processed; TADF
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2017.08.045

A self-host thermally activated delayed fluorescence (TADF) dendrimer, namely MPPA-MCBP, for solution-processed nondoped near-infrared organic light-emitting diodes (OLEDs) was designed and synthesized, in which the bipolar CBP derivatives is introduced to render balanced charge transportation. This structural modification that the dendrons are well-bounded by the flexible alkyl chains, which can efficiently reduce the intermolecular interactions between the emissive cores and ensure the stable operation of the solution-processed device. As a result of the spin-coated OLEDs employing MPPA-MCBP as the host-free near-infrared emitter exhibits a highest external quantum efficiency (EQE) of 0.62% and a peak wavelength at 698 nm, which indicates the design of self-host TADF dendrimers containing bipolar dendrons will be a promising strategy to improve the electroluminescent performance of solution-processed nondoped device. Here, a novel self-host TADF dendrimer for solution-processed nondoped near-infrared OLEDs was designed and synthesized, in which the bipolar CBP derivatives is introduced to render balanced charge transportation. [Display omitted] •A novel self-host near-infrared TADF dendrimer MPPA-MCBP with four-arm encapsulation was designed and synthesized.•Bipolar MCBP dendrons can effectively reduce the unwanted concentration quenching and the unbalanced charge transfer.•TADF dendrimers with bipolar dendrons will be a feasible approach to develop efficient nondoped solution-processed OLEDs.