Cesium Lead Halide Perovskite Quantum Dots in the Limelight: Dynamics and Applications

Abstract

All-inorganic metal halide perovskites are a new emerging star following organometallic halide perovskites, thanks to their outstanding optoelectronic properties and relatively higher stability at the same time. Our group has contributed in this field through developing novel fabrication methods for perovskite micro/nano crystals, cesium lead halide perovskite quantum dots (CsPbX3 QDs) in particular, and investigating their photoinduced excited-state dynamics via various time-resolved spectroscopic techniques. Therefore in this chapter, we focus on the review of (nonlinear) optical properties and dynamics of CsPbX3 QDs. The chapter is organized as the followings: immediately after Sect. 6.1 of Introduction, Sect. 6.2 summarizes current preparation methods and focuses on mechanosynthesis (ball milling technique strategy), a methodology we are among the earliest groups to advocate. Section 6.3 details the photoinduced excited-state dynamics of perovskite QDs as fast as femtosecond (fs) scale, through different time-resolved spectroscopic tools including fluorescence lifetime measurement, fs transient absorption spectroscopy, streak camera, etc. Section 6.4 reviews the applications of CsPbX3 QDs stemming from their unique optical/electronic properties: optoelectronic devices, photocatalysis, nanolasers, and particularly nonlinear optics. The final Sect. 6.5 is Perspectives, which gives the thoughts for the future trend of the field from the authors. To sum up, all-inorganic perovskite QDs have thrived in the optoelectronic field. Numerous new experimental findings and applications of them are springing up every day. As an exciting new territory, there is much to be explored through joint efforts of researchers from varied background of physics, chemistry, optics, electronics, engineering, etc., through employing powerful methodologies like ultrafast spectroscopy.