当前位置: X-MOL 学术J. Phys. Chem. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Room-Temperature Phosphorescence of Pure Axially Chiral Bicarbazoles
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-06-21 , DOI: 10.1021/acs.jpclett.2c01614
Jintong Song 1 , Yanying Wang 2 , Lang Qu 1 , Lizhi Fang 1 , Xiangge Zhou 1 , Zong-Xiang Xu 3 , Cheng Yang 1 , Peng Wu 1, 2 , Haifeng Xiang 1
Affiliation  

Ultralong room-temperature phosphorescence (RTP) is greatly important in a series of applications, but obtaining RTP from metal-free organic materials is still an enormous challenge due to the spin-forbidden nature of triplet excitons. Because of its electron-rich nature and easy derivatization, carbazole (Cz) is widely used to build organic RTP and thermally activated delayed fluorescence (TADF) materials. However, Liu et al. (Nat. Mater.2021, 20, 175) recently demonstrated that the RTP of Cz is induced by charge traps of its isomeric impurity in commercial sources. Here, on the basis of the classical El-Sayed rule and the recently discovered intersystem crossing promotion principles (twisted structure and charge transfer), we designed and prepared highly pure (>99.9%) (R/S)-octahydro-binaphthyl-based bicarbazoles (BiCz) for high-performance RTP (ΦP = 23%; τp = 1.09 s). Interestingly, BiCz exhibited photoactivated TADF and RTP in isolated and aggregated states, respectively, and thus would be an efficient tool for rejuvenating Cz-based RTP.

中文翻译:

纯轴向手性双咔唑的室温磷光

超长室温磷光(RTP)在一系列应用中非常重要,但由于三重态激子的自旋禁止性质,从无金属有机材料中获得 RTP 仍然是一个巨大的挑战。由于其富电子性质和易于衍生化,咔唑(Cz)被广泛用于构建有机RTP和热激活延迟荧光(TADF)材料。然而,刘等人。( Nat. Mater. 2021 , 20 , 175) 最近证明,Cz 的 RTP 是由商业来源中其异构杂质的电荷陷阱引起的。在这里,基于经典的 El-Sayed 规则和最近发现的系统间交叉促进原理(扭曲结构和电荷转移),我们设计并制备了高纯度(>99.9%)(R / S )-八氢-联萘基联咔唑 ( BiCz ) 用于高性能 RTP (Φ P = 23%; τ p = 1.09 s)。有趣的是,BiCz分别在孤立和聚集状态下表现出光活化的 TADF 和 RTP,因此将成为振兴基于 Cz 的 RTP 的有效工具。
更新日期:2022-06-21
down
wechat
bug