Abstract
Colloidal cesium lead halide nanocrystals (CsPbX3, where X = Cl, Br, and I) are newcomer optoelectronic materials and have been successfully utilized as bright light sources and high-efficiency photovoltaics due to their facial solution processability. However, detailed understanding of their fundamental chemistry and photophysics behavior are urgently required for utilizing the full potential of the perovskite nanocrystals. In this work, we described a simple and efficient approach for regulating the blinking behavior of the CsPbX3 nanocrystals through varying halide composition. We systematically investigated the ensemble and single-particle optical properties of the mixed-halide CsPbBrxI3–x and CsPbBr3–yIy nanocrystals via two different anion-exchange routes (Br– ions → I– ions and I– ions → Br– ions). The power-law fitting results demonstrated that both the “on” and “off” events of their fluorescence exhibited a similar power-law rule to those of the cadmium chalcogenide nanocrystals (e.g., CdSe nanoc...
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