Preparation of CsPbBr3@PS composite microspheres with high stability by electrospraying

Abstract

Cesium lead halide perovskite quantum dots (PQDs) have attracted great interest due to their excellent optical properties. However, PQDs are easily prone to degradation under moisture or polar solvents, which greatly hinders their practical applications. In this communication, ultrastable and highly luminescent CsPbBr₃@PS microspheres with a uniform morphology are prepared via a simple and efficient electrospraying method. As a result, the as-prepared CsPbBr₃@PS microspheres not only retain the excellent luminescence properties of CsPbBr₃ PQDs, but also exhibit superior stability against anion-exchange and water. After being immersed into water for 30 days, the CsPbBr₃@PS microspheres still exhibit strong luminescence without any obvious change. When they come into contact with the KI solution, the photoluminescence (PL) intensity of the CsPbBr₃@PS microspheres changes very little and the PL wavelength shows no shift after 9 hours. Furthermore, the applications of CsPbBr₃@PS microspheres in light-emitting diodes are also investigated to demonstrate their ultrastability in water. This facile and versatile method of protecting PQDs by electrospraying opens new possibilities for applications in an aqueous phase such as cell imaging.