Stimuli-responsive luminogens with aggregation-induced emission and excited state intramolecular proton transfer (ESIPT) properties have applications in storage devices, anti-counterfeiting, imaging, and sensors. Nevertheless, group rotation appears in twisted intramolecular charge transfer (TICT) state, resulting in decreased fluorescence intensity. Inhibiting TICT remains a challenge based on their intrinsic molecular configuration. Herein, we present a simple facile pressure-induced method to restrict the TICT behavior. Steady-state spectroscopy measurement shows that fluorescence enhancement and color shifts can be achieved under high pressure. Combined with in situ high-pressure ultrafast spectroscopy and theoretical calculations, the TICT behavior was restricted in two aspects. The ESIPT process was damaged, hence more particles stored in the E* state, and transferred to the TICT state hardly. Also, the rotation of (E)-dimethyl5-((4-(diethylamino)-2-hydroxybenzylidene)amino)isophthalate (SBOH) was restricted, significantly increasing the fluorescence intensity. This approach provides a new strategy for the development of stimulus-responsive materials.

具有聚集诱导发射和激发态分子内质子转移 (ESIPT) 特性的刺激响应发光体在存储设备、防伪、成像和传感器中具有应用。然而，基团旋转出现在扭曲的分子内电荷转移（TICT）状态，导致荧光强度降低。基于其固有的分子结构，抑制 TICT 仍然是一个挑战。在此，我们提出了一种简单易用的压力诱导方法来限制 TICT 行为。稳态光谱测量表明，在高压下可以实现荧光增强和颜色偏移。结合现场高压超快光谱和理论计算表明，TICT行为在两个方面受到限制。ESIPT 过程被破坏，因此更多的粒子存储在 E* 状态，并且很难转移到 TICT 状态。此外，(E)-dimethyl5-((4-(diethylamino)-2-hydroxybenzylidene)amino)isophthalate (SBOH) 的旋转受到限制，显着增加了荧光强度。这种方法为刺激响应材料的开发提供了新的策略。