Multi-color afterglow from amorphous hybrid perovskites for flexible programmable composites with heterostructure

Organic-inorganic hybrid perovskites (OIHPs) with ultralong organic phosphorescence (UOP) have attracted much attention because of the unique optical properties and long lifetime. However, developing amorphous UOP perovskites with excellent processing performance remains a significant challenge. Herein, N-aminoethyl piperazine is employed as a non-conjugated ligand to synthesize amorphous Cd-based OIHPs (named as AC-A) which exhibit a white-light emission and green phosphorescence of the clusters formed by organic ligands. Due to the ultralong lifetime of phosphorescence, the AC-A perovskites display a green long afterglow lasting for up to 8s. The afterglow color can be adjusted to orange and red by doping inorganic and organic guest, respectively. Furthermore, flexible and adhesive threadiness heterostructure composites with different afterglow color are prepared by coating polylactic acid on AC-A, and successfully applied to a programmable information encryption system. This work not only utilizes rigid inorganic octahedra to protect organic clusters and realizes UOP in amorphous hybrid perovskite, but also provides a new design idea and example for developing amorphous flexible cluster luminescent materials with multi-color afterglow.