Cascade Polymer Trap Induced Week-level Organic Long Persistent Luminescence

In recent years, organic long persistent luminescence (OLPL) materials have achieved a big breakthrough of hour-level long persistent luminescence (LPL) through the charge-separation mechanism in host-guest composites. However, it is still much challenging for OLPL materials to realize such performance using the common cheap optoelectronic inert polymers as the host component. In this work, the electron-deficient naphthalenediimide derivatives as guests are dispersed into a variety of polymers, and hour-level LPL is achieved for the first time in the common cheap optoelectronic inert poly(methyl methacrylate) (PMMA), poly(L-lactic acid) (PLLA), poly(vinyl acetate) (PVAc) and polystyrene (PS) hosts. By compositing the common commercial-available PMMA and polycarbonate (PC) together, an unprecedent week-level LPL is observed. Cascade polymer hole trap mechanism is proposed for such unprecedent LPL performance. This innovation paves the way for OLPL materials to replace the commercial inorganic materials in the future.