Finely Controlled Circularly Polarized Luminescence of a Mechano‐Responsive Supramolecular Polymer

Finely controlled circularly polarized luminescence (CPL) supramolecular polymerization based on a tetraphenylethene core with four l‐ or d‐alanine branch side chains (l‐1 and d‐1) in the solution state is presented, resulting from the tuning of mechanical stimulus. Weak, green emissions of l‐1 and d‐1 in tetrahydrofuran (THF) were converted into strong blue emissions by tuning the mechanical stimulus. The strong blue emissions were caused by an aggregation‐induced emission (AIE) effect during the formation of a supramolecular polymer. Lag time in the supramolecular polymerization was drastically reduced by the mechanical stimulus, which was indicative of the acceleration of the supramolecular polymerization. A significant enhancement of circular dichroism (CD) and CPL signals of l‐1 and d‐1 was observed by tuning the rotational speed of the mechanical stimulus, implying that the chiral supramolecular polymerization was accelerated by the mechanical stimulus. Chiral supramolecular polymerization is controlled, resulting from the tuning of mechanical stimulus. Weak, green emissions were converted into strong blue emissions by tuning the mechanical stimulus. The strong blue emissions were caused by an aggregation‐induced emission (AIE) effect during the formation of a supramolecular polymer.