Polymorphism-dependent thermally activated delayed fluorescence materials with diverse three dimensional supramolecular frameworks

Abstract Multifunctional organic luminescent materials have attracted intensive interests. Nevertheless, the mechanisms behind them are still to be explored. In this work, we reported four multifunctional emitters with thermally activated delayed fluorescence (TADF), aggregation-induced emission (AIE), multicolor mechanochromic luminescence (MCL) and polymorphism. We also demonstrated their applications in acid/base-responsive on/off chemosensors, ink-free rewritable paper and organic light-emitting diodes (OLEDs). By deeply analyzing their three dimensional supramolecular frameworks with ordered micro pores and different intermolecular interactions in crystal structures, we revealed the underlying mechanisms of polymorph-dependent TADF and multicolor MCL simultaneously.