Fluorine Polymer-Modified Dion-Jacobson Perovskites Enabling Sky-Blue Perovskite Light-Emitting Diodes with an Efficiency of 16.55%

Quasi-2D Dion-Jacobson (DJ) perovskites are promising candidates for fabricating high-performance blue-emitting perovskite light-emitting diodes (PeLEDs) because of their strong quantum/dielectric confinement and high stability. However, obtaining high-efficiency blue PeLEDs based on DJ perovskites remains a major challenge. Herein, sky-blue DJ perovskites are synthesized by using 1,8-diamino-3,6-dioxaoctane as an organic diamine and high-quality perovskite films are prepared by incorporating poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as an additive, aiming to improve the photoluminescence quantum yield and electron carrier mobility of the film used as an emissive layer in PeLEDs. Finally, sky-blue PeLEDs using PVDF-HFP-modified DJ perovskite films are demonstrated to show a high maximum external quantum efficiency of 16.55%. A promising strategy is provided to design high-quality perovskite films for constructing high-performance blue PeLEDs.

Automated summary

In this study, sky-blue DJ perovskites were synthesized using an organic diamine and high-quality perovskite films were prepared by incorporating a polymer as an additive. The resulting PeLEDs exhibited a high external quantum efficiency of 16.55%.