Mechanochemical synthesis and characterization of Mn-doped CsPbCl3 perovskite nanocrystals

Abstract

Mn-doped CsPbCl3 nanocrystals are considered to be a promising material for luminescence and display applications owing to Mn doping provides a way to introduce new optical properties and reduce the use of toxic Pb. Complicate ion-exchange and hot-injection are commonly used for the fabrication of the nanocrystals. Developing a fast and efficient synthesis method remains a challenge so far. Herein, we developed a simplified solid-state mechanochemical approach to synthesize Mn-doped CsPbCl3 nanocrystals and investigated the structure and luminescence properties of the as-synthesized nanocrystals. Cubic morphology of Mn-doped CsPbCl3 nanocrystals with average size of 13 nm have been obtained by this approach. Mn was successfully incorporated in CsPbCl3 perovskite nanocrystals, resulting in a high photoluminescence quantum yield of 40.7% with an improvement of stability. Emission peak of 594 nm that can be assigned to the luminescence of Mn2+ d-d transition was observed under 365 nm UV excitation. The color of the luminescence changed from blue to warm white to yellow depended on the amount of Mn doping, exhibiting a tunable-color property. It is expected that this approach provides an effective route that would help for synthesis of perovskite nanocrystals doped with different dopants.