Beilstein J. Nanotechnol.2019,10, 666–676, doi:10.3762/bjnano.10.66
perovskite nanocrystals (PNCs) and their reversible transformation. The as-prepared CsPbBr3PNCs 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 CsPbBr3PNCs can be tuned by changing
the ultrasound power, radiation time, and the height of the vibrating spear. The optimized CsPbBr3PNCs show a good stability and high PL QY of up to 85%. In addition, the phase transformation between CsPbBr3PNCs and Cs4PbBr6 PNCs can be obtained through varying the amount of oleylamine (OAm) and
water. The mechanism of this transformation between the CsPbBr3PNCs and Cs4PbBr6 PNCs and their morphology change are studied, involving ions equilibrium, anisotropic growth kinetics, and CsBr-stripping process.
Keywords: CsPbBr3PNCs; Cs4PbBr6 PNCs; polar-solvent-free; reversible transformation
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Scheme 1:
Illustration of synthesizing CsPbBr3 and Cs4PbBr6 PNCs without polar solvent using ultrasonication ...