Effect of morphology of CsPbBr3 nanocrystals on their optical properties

In this paper, the morphology of CsPbBr3 nanocrystals (NCs) is controlled by changing the molar ratios of oleylamine (OAm) and propionic acid (PA). The relative ratio plays an important role in the evolution of morphology. The CsPbBr3 NCs exhibit monoclinic morphology when the molar ratio of OAm/PA is equivalent. When the molar ratio of OAm/PA deviates from 1:1, CsPbBr3 NCs tend to grow in a sheet shape. The nanosheets with 200 similar to 500 nm and thickness similar to 15 nm were synthesized as the molar ratio of OAm/PA (1:4). The PL intensity decreases with the increase of size. The fluorescence lifetime shows a trend of gradual shortening.