Solution-processable thermally activated delayed fluorescent (TADF) materials have received tremendous attentions due to high exciton utilization, easily scalable large-scale applications. Herein, Thermal cross-linking technology is used to process carbazolyl cyanobenzene (CzCB) derivatives to construct solution-processable thin film networks. We synthesized two novel materials 3CzCN-DV and 3CzCN-O-DV, which could be tightly or loosely cross-linked through varying introduction of flexible alkyl chains. For 3CzCN-O-DV with core-dendron structure, thermal cross-linking in the dendrons was found to preserve the emissive color integrity compared to 3CzCN-DV and allowed for facile solution processing owing to more uniform film morphology. Furthermore, the decreased cross-linking temperature was shown to be advantageous for fabrication of solution-processed OLEDs whose performance was far beyond cross-linked devices based on 3CzCN-DV. This provides a novel method for systematic design of low-temperature cross-linkable luminescent materials, which pave the way for fabrication of fully solution-processed OLEDs that require solution-processable multilayer thin films.

由于激子利用率高，易于扩展的大规模应用，可溶液处理的热活化延迟荧光（TADF）材料受到了广泛的关注。本文中，热交联技术用于处理咔唑基氰基苯（CzCB）衍生物，以构建可溶液处理的薄膜网络。我们合成了两种新颖的材料3CzCN-DV和3CzCN-O-DV，它们可以通过灵活引入柔性烷基链而紧密或松散地交联。对于具有核心-树枝状结构的3CzCN-O-DV，发现与3CzCN-DV相比，树枝状结构中的热交联保留了发射色完整性，并且由于更均匀的薄膜形态而允许进行简便的溶液处理。此外，结果表明，降低的交联温度有利于溶液加工的OLED的制造，其性能远远超过基于3CzCN-DV的交联器件。这为低温可交联的发光材料的系统设计提供了一种新颖的方法，为需要溶液可加工的多层薄膜的完全溶液加工的OLED的制造铺平了道路。