Designable and highly stable emissive CsPbI<sub>3</sub> perovskite quantum dots/polyvinylidene fluoride nanofiber composites
Yu Shao, Chao Zhang, Chaocheng Zhou, Tao Wang, Jing Chen, Xiaolin Liu, Jia Lin, Xianfeng Chen
Abstract
All-inorganic CsPbI 3 perovskite quantum dots (QDs) with efficient pure red emission are broadly researched for applications as next-generation light emitters. Their optical stability against humidity and water, on the other hand, is a great barrier that needs to be significantly enhanced. In this study, polyvinylidene fluoride (PVDF) nanofibers (NFs) were synthesized by electrospinning and CsPbI 3 QDs were effectively composited into the interior of the PVDF NFs matrix by dip-coating. The CsPbI 3 QDs/PVDF NFs composites exhibited a high red photoluminescence (PL) quantum yield of ∼11% with the PL peak slightly blue shifted compared with the bare QDs. Due to the high hydrophobicity, porosity, and excellent thermal insulation of the PVDF NFs and uniform dispersion of the QDs in the NFs network, the composite membrane demonstrated excellent water, thermal, and UV light resistance. In addition, the CsPbI 3 QDs/PVDF NFs composites were revealed to exhibit high designability, flexibility, and repeatability, indicating significant potential for different light-emitting applications.