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Abstract
We developed a colloidal synthesis of CsPbBr3 perovskite nanocrystals (NCs) at a relative
low temperature (90 °C) for the bright blue emission which differs from the original
green emission (∼510 nm) of CsPbBr3 nanocubes as reported previously. Shapes of the
obtained CsPbBr3 NCs can be systematically engineered into single and lamellar-structured
0D quantum dots, as well as face-to-face stacking 2D nanoplatelets and flat-lying
2D nanosheets via tuning the amounts of oleic acid (OA) and oleylamine (OM). They
exhibit sharp excitonic PL emissions at 453, 472, 449, and 452 nm, respectively. The
large blue shift relative to the emission of CsPbBr3 bulk crystal can be ascribed
to the strong quantum confinement effects of these various nanoshapes. PL decay lifetimes
are measured, ranging from several to tens of nanoseconds, which infers the higher
ratio of exciton radiative recombination to the nonradiative trappers in the obtained
CsPbBr3 NCs. These shape-controlled CsPbBr3 perovskite NCs with the bright blue emission
will be widely used in optoelectronic applications, especially in blue LEDs which
still lag behind compared to the better developed red and green LEDs.