Manipulating the Stacking of Triplet Chromophores in the Crystal Form for Ultralong Organic Phosphorescence
Manipulating the Stacking of Triplet Chromophores in the Crystal Form for Ultralong Organic Phosphorescence
复制标题
操纵晶体形式三重态发色团的堆叠以实现超长有机磷光
DOI：
10.1002/anie.201907572
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发表时间：
2019-08-28
影响因子：
16.6
通讯作者：
Huang, Wei
中科院分区：
文献类型：
--
作者：
Gan, Nan;Wang, Xuan;Huang, Wei
这里提供的证据表明，三重态生色团之间的堆积在晶体内超长有机磷光(UOP)的产生中起着关键作用。通过改变功能单元的结构，观察到每个结构的不同的开关UOP行为。值得注意的是，咔唑单元之间分子间相互作用最强的24CPhCz显示出最令人印象深刻的UOP，其长寿命为1.06S，磷光量子产率为2.5%。~(34)CPhCz显示出双发射的UOP和热激活延迟荧光(TADF)，磷光寿命略有缩短，为770ms，而~(35)CPhCz只显示TADF，这是因为三重态之间没有强的电子耦合。这项研究为晶体中UOP的产生提供了解释，并为获得UOP材料提供了新的指南。
Provided here is evidence showing that the stacking between triplet chromophores plays a critical role in ultralong organic phosphorescence (UOP) generation within a crystal. By varying the structure of a functional unit, and different on-off UOP behavior was observed for each structure. Remarkably, 24CPhCz, having the strongest intermolecular interaction between carbazole units exhibited the most impressive UOP with a long lifetime of 1.06 s and a phosphorescence quantum yield of 2.5 %. 34CPhCz showed dual-emission UOP and thermally activated delayed fluorescence (TADF) with a moderately decreased phosphorescence lifetime of 770 ms, while 35CPhCz only displayed TADF owing to the absence of strong electronic coupling between triplet chromophores. This study provides an explanation for UOP generation in crystal and new guidelines for obtaining UOP materials.