Three AIE-active branched luminophores (defined as 4a, 4b and 4c) containing triphenylamine and carbazole units forming intramolecular charge transfer (ICT) states have been developed. The studies of the mechanical stimuli effect on solid state showed that the branch number can affect effectively the performance of the tunable fluorescence in the solid state. Interestingly, only compound 4a displayed a distinct bathochromic shift of its fluorescence emission from the visible (λ_em = 598 nm) to the near-infrared section (λ_em = 643 nm) by mechanical stimuli. Moreover, 4a exhibited an obvious crystallization-induced emission enhancement (CIEE) effect. The crystal samples of 4a emit strong orange light with 49.8% solid-state fluorescence quantum yield (Ф_F) and the amorphous showed decreased red emission with 7.6% (Ф_F). Mechanical grinding and organic solvent stimuli can reversibly change the phase transition between crystalline and amorphous states. However, compounds 4b and 4c are not sensitive to the mechanical stimuli, because it is difficult for them to form crystalline structure due to bigger steric hindrance effect. The mechanism for their solid-state fluorescence behavior was investigated in detail by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) analysis.

已经开发了包含三苯胺和咔唑单元的三个具有分子内电荷转移（ICT）状态的AIE活性分支发光体（定义为4a，4b和4c）。对固态的机械刺激作用的研究表明，分支数可以有效地影响固态的可调荧光的性能。有趣的是，只有化合物4a 受到机械刺激，其荧光发射从可见光（_λem  = 598 nm）到近红外区（_λem = 643 nm）呈现出明显的红移。而且4a表现出明显的结晶诱导发射增强（CIEE）效果。的晶体样品4A发射强橙色光49.8％固态荧光量子产率（Ф _˚F）和非晶性表现出与7.6％（减小红色发射Ф _˚F）。机械研磨和有机溶剂刺激可以可逆地改变晶态和非晶态之间的相变。但是，化合物4b和4c对机械刺激不敏感，因为它们由于较大的位阻效应而难以形成晶体结构。通过粉末X射线衍射（PXRD），扫描电子显微镜（SEM）和差示扫描量热法（DSC）分析详细研究了其固态荧光行为的机理。