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For the melted powders,due to the rapid cooling,the molecules may have quickly aggregated to become amorphous,which tends towards a more planar structure.This proposal was further supported by the poor reflection peaks of the PXRD pattern in Fig. 3B. During the long annealing process (Film-h),the molecules in the powder might restructure themselves andadopt a more distorted conformation to fit into the crystalline lattice, which enables the powder to emit a weak fluorescence.Uniquely, the quantum yields of samples Melted-m and the drop-casting film were evidently higher than that of the ground powder, which could be attributed to the uneven grinding force applied to the pristine powder and the spontaneous recovery ability of the ground powder. As depicted in Fig. S7,† the emission intensity of the freshly ground powder was spontaneously reduced with a slight blue-shift as time passed. Thus,the obtained quantum yields become smaller. In a word, the solid-state TPA-CO with larger twist angles exhibited a tunable molecular conformation, which led to a change in intramolecular conjugation and intermolecular interactions under external stimuli. |
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