Investigation of the stability of the optical characteristics of thin films based on CsPbBr$_3$ perovskite nanocrystals and p(MMA-LMA) copolymer

Despite the excellent optical characteristics of perovskite nanocrystals (PNCs) based on CsPbBr$_3$, they have a relatively low stability, which limits their use as materials for hybrid light-emitting diodes, single-photon sources, solar cells, and other optoelectronic devices, as well as X-ray and gamma-ray detectors. The present study reports the results of experiments on composite thin films based on PNCs and copolymer of methyl and lauryl methacrylates. The changes in the quantum yield and mean luminescence lifetime in thin film samples with different copolymer mass fractions relative to CsPbBr$_3$-based PNCs have been investigated. It has been shown that composite samples containing from 10 to 20 wt.% of copolymer have an improved temporal stability of optical characteristics, which makes them promising for practical use in optoelectronic applications.