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.

中文翻译：

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控制轴向手性有机发光体及其消旋体的热激活延迟荧光用于信息加密

通过一锅顺序合成法容易地制备了一对轴向手性有机对映异构体。它们表现出圆偏振发光活性，并具有热激活延迟荧光 (TADF) 和聚集诱导发射增强特性。同时，这两种对映异构体在结晶状态下表现出显着且可逆的热致变色，使双色 TADF 在橙色和红色之间切换。然而，当它们形成共晶时，所得外消旋体表现出相反的热致变色行为。这些有趣的结果可能源于它们不同的光学活动，导致不同的分子堆积模式和分子构象变化。此外，首次提出了基于有机对映体及其外消旋体热致变色的信息加密。