Beilstein J. Nanotechnol.2019,10, 666–676, doi:10.3762/bjnano.10.66
perovskite nanocrystals (PNCs) and their reversible transformation. The as-prepared CsPbBr3 PNCs and Cs4PbBr6PNCs 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 Cs4PbBr6PNCs can be obtained through varying the amount of oleylamine (OAm) and
water. The mechanism of this transformation between the CsPbBr3 PNCs and Cs4PbBr6PNCs and their morphology change are studied, involving ions equilibrium, anisotropic growth kinetics, and CsBr-stripping process.
Keywords: CsPbBr3 PNCs; Cs4PbBr6PNCs; polar-solvent-free; reversible transformation
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Scheme 1:
Illustration of synthesizing CsPbBr3 and Cs4PbBr6 PNCs without polar solvent using ultrasonication ...