Two D-A type cruciform luminophores FB-CTPAEB and DFB-CTPAEB were designed and prepared. The two compounds exhibited unique intramolecular charge-transfer (ICT) and solid-state fluorescence behavior. The results show that both compounds exhibit AIEE behavior and high solid-state luminescence efficiency (up to 0.693 and 0.442, respectively). Moreover, FB-CTPAEB and DFB-CTPAEB show remarkable mechanofluorochromic (MFC) properties. Once the as-prepared samples were subjected to grinding, the emission of the two cruciform luminophores was red shifted by 52 nm and 46 nm, correspondingly, their fluorescence colors changed from yellow and reddish orange to red, respectively. The fluorescence emission changes induced by grinding can be restored by solvent-fuming and regenerated by grinding. PXRD analysis revealed that the MFC behavior of FB-CTPAEB and DFB-CTPAEB came from the transformation between crystalline and amorphous states upon external stimuli. Meanwhile, the extension in molecular conjugation caused by planarization of molecular conformation and subsequent planar intramolecular charge transfer (PICT) process were responsible for the red-shifts in the PL spectra.

设计并制备了两种DA型十字形发光体FB-CTPAEB和DFB-CTPAEB。这两种化合物表现出独特的分子内电荷转移（ICT）和固态荧光行为。结果表明这两种化合物均表现出AIEE行为和高固态发光效率（分别高达0.693和0.442）。此外，FB-CTPAEB和DFB-CTPAEB显示出显着的机械氟致变色（MFC）特性。一旦将所制备的样品进行研磨，则两个十字形发光体的发射红移了52nm和46nm，相应地，它们的荧光颜色分别从黄色和红橙色变为红色。研磨引起的荧光发射变化可通过溶剂发烟恢复并通过研磨再生。PXRD分析显示FB-CTPAEB和DFB-CTPAEB的MFC行为来自外部刺激时晶态和非晶态之间的转换。同时，由分子构象的平面化和随后的平面分子内电荷转移（PICT）过程引起的分子共轭的扩展是造成PL光谱中的红移的原因。