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.

设计并合成了用于溶液加工的非掺杂近红外有机发光二极管（OLED）的自宿主热活化延迟荧光（TADF）树状聚合物MPPA-MCBP，其中引入了双极性CBP衍生物以实现平衡收费运输。树状结构被柔性烷基链很好地结合的这种结构修饰，可以有效地减少发射核之间的分子间相互作用，并确保溶液处理装置的稳定运行。采用MPPA-MCBP作为无宿主近红外发射器的旋涂OLED表现出0.62％的最高外部量子效率（EQE）和698 nm的峰值波长，