Example：10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
Controlling the thermally activated delayed fluorescence of axially chiral organic emitters and their racemate for information encryption Chemical Science (IF9.825), Pub Date : 2021-11-18, DOI: 10.1039/d1sc04738h Bingjia Xu, Zicun Song, Minmin Zhang, Qingqing Zhang, Long Jiang, Cao Xu, Lijun Zhong, Changlin Su, Qiqi Ban, Cong Liu, Fengqiang Sun, Yi Zhang, Zhenguo Chi, Zujin Zhao, Guang Shi
A pair of axially chiral organic enantiomers were facilely prepared through a one-pot sequential synthesis. They exhibit circularly polarized luminescence activities and have thermally activated delayed fluorescence (TADF) and aggregation-induced emission enhancement properties. Meanwhile, these two enantiomers present remarkable and reversible thermochromism in the crystalline state, enabling dual-colour TADF switching between orange and red. However, when they form cocrystals, the resulting racemate shows opposite thermochromic behaviors. These intriguing results probably emanate from their different optical activities, leading to distinct molecular packing modes and molecular conformation variations. Moreover, information encryption based on thermochromism of organic enantiomers and their racemate has been presented for the first time. This work may expand the application scope of chiral organic luminogens and pave a new way to construct intelligent luminescent systems.