Proceedings of Online Meetup - Beyond Lead Halide Perovskites: Syntheses and Applications of Metal Halide Semiconductors (MABP)
Publication date: 23rd April 2020
The optoelectronic properties of CsPbX3 (X = Cl, Br or I) perovskite nanocrystals can be tailored by controlling their halide composition—with CsPbCl3, CsPbBr3 and CsPbI3 emitting blue, green, and red, respectively.[1] Post-synthetic control over the halide composition has been achieved via anion-exchange reactions, which readily take place at room temperature.[2–3] Here we use optical spectroscopy at high temporal resolution to study the dynamics of anion exchange. The first steps are most likely featured by fast halide exchange of the outer layer, causing lattice strain and thereby a low photoluminescence quantum yield (PLQY). In later stages, the composition of the nanocrystals slowly converges towards an equilibrium state with a high PLQY. In parallel, an apparent increase of emissive nanocrystals is observed in the course of anion exchange, which we ascribe to the revival of a dark fraction of nanocrystals.
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