Organic mechanoluminescence (ML), especially dynamic ML with color change along continuously grinding, is promising for mechano-dependent applications of lighting, imaging and sensors. Here, new insights for fine tuning ML feature from no, stable to dynamic characteristic, are reported by simply changing the substituted position of bromine atom on isomers of phenothiazine (PTZ) derivative (Br-BPZ). Additionally, three key factors, including mechano-induced conformation transformation, mixture formation of crystal and amorphous powders after ground as well as the energy transfer from ML of crystal part to photoluminescence (PL) of amorphous part inside, have been experimentally confirmed for promoting dynamic ML (an extremely rare kind of ML) of organic materials. These findings not only provide a strategy for design of organic ML but also develop a new application of colorful ML display without doping based on dynamic ML materials.

有机机械致发光 (ML)，尤其是随着连续研磨而颜色变化的动态 ML，有望用于照明、成像和传感器的机械相关应用。在这里，通过简单地改变吩噻嗪 (PTZ) 衍生物 (Br-BPZ) 异构体上溴原子的取代位置，报道了微调 ML 特征从无、稳定到动态特性的新见解。此外，实验证实了三个关键因素，包括机械诱导的构象转变、研磨后晶体和非晶粉末的混合形成以及从晶体部分的 ML 到内部非晶部分的光致发光 (PL) 的能量转移，以促进动态ML（一种极为罕见的 ML）有机材料。