Stretch induced photoluminescence enhanced perovskite quantum dot polymer composites

Abstract

Halide perovskites are promising materials for optoelectronic applications, but simultaneously achieving high performance and long-term stability is still challenging. Here, we incorporate organosilicon-coated CsPbBr₃ quantum dots into polydimethylsiloxane (PDMS) to prepare stretchable and photoluminescent polymer composites. The modified ligand 3-aminopropyltriethoxysilane with glutaric anhydride (APTES-GA) improves the thermal stability of CsPbBr₃ QDs and enhances the interfacial bonding between PDMS and QDs. The composites achieve 95.5% absolute photoluminescence quantum yields (PLQY) after 125 °C heat treatment. The double robust organosilicon protective layers protect the QDs from polar solvents and prevent anion exchange as well. More importantly, photoluminescence enhancement is discovered during the elongation process. This novel phenomenon results from the elimination of emission reabsorption among QDs, which may open up a brand-new field for the applications of halide perovskite QDs.