Direct lithography of CsPbCl, CsPbBrCl and CsCdPbBr perovskite nanocrystals in organic media.

The in-situ generation of perovskite nanocrystals within organic media using a femtosecond laser can greatly simplify the sample preparation process and save pulse energy. In this work, three perovskite nanocrystals (PNCs), CsPbCl, CsPbBrCl, and CsCdxPbBr, were generated in situ within organic media using a femtosecond laser. These three perovskite nanocrystals emitted pure blue or blue-green fluorescence under ultraviolet (UV) irradiation. It was also found that by controlling the laser pulse energy, the CsCdPbBr nanocrystals transitioned from green to blue-green fluorescence. Furthermore, we have successfully realized the patterning of these three perovskite nanocrystals in organic media.