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Endowing TADF luminophors with AIE properties through adjusting flexible dendrons for highly efficient solution-processed nondoped OLEDs
Chemical Science ( IF 7.6 ) Pub Date : 2020-06-16 , DOI: 10.1039/d0sc02194f
Dan Liu 1 , Jing Yi Wei 1 , Wen Wen Tian 1 , Wei Jiang 1 , Yue Ming Sun 1 , Zheng Zhao 2 , Ben Zhong Tang 2
Affiliation  

The amalgamation of thermally activated delayed fluorescence (TADF) and aggregation-induced emission (AIE) properties, termed AIE-TADF, is a promising strategy to design novel robust luminescent materials. Herein, we transform 2,3,4,5,6-penta(9H-carbazol-9-yl)benzonitrile (5CzBN) from an ACQ molecule into an AIEgen by simply decorating the 5CzBN core with alkyl chain-linked spirobifluorene dendrons. By increasing the number of flexible dendrons, these materials can not only show obvious AIE-TADF characteristics and uniform film morphology, but can also exhibit better resistance to isopropyl alcohol, which are beneficial to fully solution-processed OLEDs. Notably, 5CzBN-PSP shows great device efficiency with an external quantum efficiency (EQE), current efficiency and power efficiency of 20.1%, 58.7 cd A−1 and 46.2 lm W−1, respectively and achieved record-breaking efficiency in solution-processed nondoped OLEDs based on AIE emitters. This work demonstrates a general approach to explore new efficient emitters by the marriage of AIE and TADF which could potentially improve their performance in various areas.

中文翻译:

通过调整柔性树枝状结构,赋予 TADF 发光体 AIE 特性,以实现高效溶液加工的非掺杂 OLED

热激活延迟荧光 (TADF) 和聚集诱导发射 (AIE) 特性的融合,称为 AIE-TADF,是设计新型鲁棒发光材料的一种有前途的策略。在此,我们通过简单地用烷基链连接的螺二芴树枝装饰 5CzBN 核心,将2,3,4,5,6-五(9 H -咔唑-9-基)苯甲腈(5CzBN)从 ACQ 分子转化为 AIEgen。通过增加柔性树枝的数量,这些材料不仅可以表现出明显的AIE-TADF特性和均匀的薄膜形貌,而且还可以表现出更好的耐异丙醇性,这有利于完全溶液加工的OLED。值得注意的是,5CzBN-PSP表现出极高的器件效率,外量子效率(EQE)、电流效率和功率效率分别为20.1%、58.7 cd A -1和46.2 lm W -1,并在溶液加工中实现了破纪录的效率。基于 AIE 发射器的非掺杂 OLED。这项工作展示了通过 AIE 和 TADF 结合探索新型高效发射器的通用方法,这可能会提高它们在各个领域的性能。
更新日期:2020-07-15
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