Abstract
We demonstrate an ultrasonication-assisted synthesis without polar solvent of CsPbBr3 and Cs4PbBr6 perovskite nanocrystals (PNCs) and their reversible transformation. The as-prepared CsPbBr3 PNCs and Cs4PbBr6 PNCs exhibit different optical properties that depend on their morphology, size, and structure. The photoluminescence (PL) emission and quantum yield (QY) of the CsPbBr3 PNCs can be tuned by changing the ultrasound power, radiation time, and the height of the vibrating spear. The optimized CsPbBr3 PNCs show a good stability and high PL QY of up to 85%. In addition, the phase transformation between CsPbBr3 PNCs and Cs4PbBr6 PNCs can be obtained through varying the amount of oleylamine (OAm) and water. The mechanism of this transformation between the CsPbBr3 PNCs and Cs4PbBr6 PNCs and their morphology change are studied, involving ions equilibrium, anisotropic growth kinetics, and CsBr-stripping process.
Highlights
Metal halide perovskite nanocrystals (PNCs) are promising candidates for application in the fields of light-emitting diodes (LEDs) [1,2], high-efficiency solar cells [3], low-threshold lasers [4], and photodetectors [5]
The reversible transformation between Cs4PbBr6 PNCs and CsPbBr3 PNCs was achieved by changing the amounts of OAm and water
The as-prepared CsPbBr3 PNCs show a high PL quantum yield (QY) of up to 85% and a considerable photostability and chemical stability
Summary
Metal halide perovskite nanocrystals (PNCs) are promising candidates for application in the fields of light-emitting diodes (LEDs) [1,2], high-efficiency solar cells [3], low-threshold lasers [4], and photodetectors [5]. Scheme 1: Illustration of synthesizing CsPbBr3 and Cs4PbBr6 PNCs without polar solvent using ultrasonication assistance, and their reversible transformation by adding OAm and water.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
