Luminescent perovskite nanocrystal-epoxy resin composite with high stability against water and air

The preparation of perovskite-polymer composites is one of the most effective ways to improve the stability and expand the application of inorganic perovskite quantum dots (QDs). The current study adopts a convenient and rapid ultraviolet polymerization method to prepare perovskites-polymer (CsPbX3, X = mixed Cl/Br, Br, mixed Br/I, and I) composites using inexpensive commercial epoxy resin (EP). The photoluminescence (PL) spectrum and photoluminescence quantum yield (PLQY) show that the composites can well retain the luminescent colors of the original solutions. The emission spectra of these composites can be tuned in the range of 420 nm-680 nm, which are almost consistent with the emission spectrum of perovskites QDs. Moreover, perovskite-EP composites demonstrate excellent stability in air and water without changing the PLQY for more than 30 days in air and maintaining the PL intensity above 85% for 10 days in water. These new perovskite-EP composites exhibit tensile and flexural properties due to the incorporation of flexible epoxy resin, which can be well applied to the fields of flexible luminescent devices and optical functional materials.